1
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Chartier C, Chardon-Noblat S, Costentin C. Redox Behavior and Kinetics of Hydroxo Ligand Exchange on Iron Tetraphenylporphyrin: Comparison with Chloro Exchange and Consequences for Its Role in Self-Modulation of Molecular Catalysis of Electrochemical Reactions. Inorg Chem 2024; 63:7541-7548. [PMID: 38623896 DOI: 10.1021/acs.inorgchem.4c00825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Thermodynamics and kinetics of hydroxide ion binding to iron tetraphenylporphyrin (TPPFe) at different redox states is investigated by electrochemistry and UV-vis spectroscopy. The reduction of initial TPPFe(III) drastically decreases the binding affinity of hydroxide ions. An activation-driving force correlation is revealed showing that the strongest the binding affinity, the largest the association rate constant and vice versa. Comparison with chloride ions shows that hydroxide ions are stronger ligands for iron tetraphenylporphyrin. However, kinetic data indicate that coordination and decoordination of chloride ions is intrinsically faster than coordination and decoordination of hydroxide ions. Finally, the consequence of hydroxide ion binding dynamics when TPPFe is used as a molecular catalyst for electrochemical reactions liberating hydroxides is discussed in the framework of self-modulation of catalytic processes.
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2
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Sheng H, Sun J, Rodríguez O, Hoar BB, Zhang W, Xiang D, Tang T, Hazra A, Min DS, Doyle AG, Sigman MS, Costentin C, Gu Q, Rodríguez-López J, Liu C. Autonomous closed-loop mechanistic investigation of molecular electrochemistry via automation. Nat Commun 2024; 15:2781. [PMID: 38555303 PMCID: PMC10981680 DOI: 10.1038/s41467-024-47210-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 03/18/2024] [Indexed: 04/02/2024] Open
Abstract
Electrochemical research often requires stringent combinations of experimental parameters that are demanding to manually locate. Recent advances in automated instrumentation and machine-learning algorithms unlock the possibility for accelerated studies of electrochemical fundamentals via high-throughput, online decision-making. Here we report an autonomous electrochemical platform that implements an adaptive, closed-loop workflow for mechanistic investigation of molecular electrochemistry. As a proof-of-concept, this platform autonomously identifies and investigates an EC mechanism, an interfacial electron transfer (E step) followed by a solution reaction (C step), for cobalt tetraphenylporphyrin exposed to a library of organohalide electrophiles. The generally applicable workflow accurately discerns the EC mechanism's presence amid negative controls and outliers, adaptively designs desired experimental conditions, and quantitatively extracts kinetic information of the C step spanning over 7 orders of magnitude, from which mechanistic insights into oxidative addition pathways are gained. This work opens opportunities for autonomous mechanistic discoveries in self-driving electrochemistry laboratories without manual intervention.
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Affiliation(s)
- Hongyuan Sheng
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
| | - Jingwen Sun
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Oliver Rodríguez
- Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
- Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
- Joint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Benjamin B Hoar
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Weitong Zhang
- Department of Computer Science, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Danlei Xiang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Tianhua Tang
- Department of Chemistry, University of Utah, Salt Lake City, UT, 84112, USA
| | - Avijit Hazra
- Department of Chemistry, University of Utah, Salt Lake City, UT, 84112, USA
| | - Daniel S Min
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Abigail G Doyle
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Matthew S Sigman
- Department of Chemistry, University of Utah, Salt Lake City, UT, 84112, USA
| | | | - Quanquan Gu
- Department of Computer Science, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Joaquín Rodríguez-López
- Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
- Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
- Joint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Chong Liu
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
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3
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Fortage J, Collomb MN, Costentin C. Turnover Number in Photoinduced Molecular Catalysis of Hydrogen Evolution: a Benchmarking for Catalysts? ChemSusChem 2024:e202400205. [PMID: 38529822 DOI: 10.1002/cssc.202400205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 03/22/2024] [Accepted: 03/26/2024] [Indexed: 03/27/2024]
Abstract
Development of devices for production of H2 using light and a sustainable source of electrons may require the design of molecular systems combining a molecular catalyst and a photosensitizer. Evaluation of the efficiency of hydrogen production is commonly performed in homogeneous solution with a sacrificial electron donor and the report of the maximal turnover number vs catalyst (T O N c a t lim ${TON_{cat}^{\lim } }$ ). This figure of merit is strongly dependent on deactivation pathways and does not by itself provide a benchmarking for catalysts. In particular, when the photosensitizer degradation is the primary source of limitation, a kinetic model, rationalizing literature data, shows that a decrease of the catalyst concentration leads to an increase ofT O N c a t lim ${TON_{cat}^{\lim } }$ . It indicates that exceptionally highT O N c a t lim ${TON_{cat}^{\lim } }$ obtained at very low catalyst concentration shall not be considered as an indication of an exceptional catalytic system. We advocate for a systematic kinetic analysis in order to get a quantitative measure of the competitive pathways leading toT O N c a t lim ${TON_{cat}^{\lim } }$ values and to provide keys for performance improvement.
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Affiliation(s)
- Jérôme Fortage
- Département de Chimie Moléculaire, Univ. Grenoble Alpes, CNRS, 38000, Grenoble, France
| | - Marie-Noëlle Collomb
- Département de Chimie Moléculaire, Univ. Grenoble Alpes, CNRS, 38000, Grenoble, France
| | - Cyrille Costentin
- Département de Chimie Moléculaire, Univ. Grenoble Alpes, CNRS, 38000, Grenoble, France
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4
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Reuillard B, Costentin C, Artero V. Deciphering Reversible Homogeneous Catalysis of the Electrochemical H 2 Evolution and Oxidation: Role of Proton Relays and Local Concentration Effects. Angew Chem Int Ed Engl 2023; 62:e202302779. [PMID: 37073946 DOI: 10.1002/anie.202302779] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/19/2023] [Accepted: 04/19/2023] [Indexed: 04/20/2023]
Abstract
Nickel bisdiphosphine complexes bearing pendant amines form a unique series of catalysts (so-called DuBois' catalysts) capable of bidirectional/reversible electrocatalytic oxidation and production of dihydrogen. This unique behaviour is directly linked to the presence of proton relays installed close to the metal center. We report here for the arginine derivative [Ni(P2 Cy N2 Arg )2 ]6+ on a mechanistic model and its kinetic treatment that may apply to all DuBois' catalysts and show that it allows for a good fit of experimental data measured at different pH values, catalyst concentrations and partial hydrogen pressures. The bidirectionality of catalysis results from balanced equilibria related to hydrogen uptake/evolution on one side and (metal)-hydride installation/capture on the other side, both controlled by concentration effects resulting from the presence of proton relays and connected by two square schemes corresponding to proton-coupled electron transfer processes. We show that the catalytic bias is controlled by the kinetic of the H2 uptake/evolution step. Reversibility does not require that the energy landscape be flat, with redox transitions occurring at potentials up to 250 mV away for the equilibrium potential, although such large deviations from a flat energy landscape can negatively impacts the rate of catalysis when coupled with slow interfacial electron transfer kinetics.
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Affiliation(s)
| | | | - Vincent Artero
- Univ Grenoble Alpes, CNRS, CEA, IRIG, LCBM, 38000, Grenoble, France
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5
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Zhu Q, Costentin C, Stubbe J, Nocera DG. Disulfide radical anion as a super-reductant in biology and photoredox chemistry. Chem Sci 2023; 14:6876-6881. [PMID: 37389245 PMCID: PMC10306091 DOI: 10.1039/d3sc01867a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 05/17/2023] [Indexed: 07/01/2023] Open
Abstract
Disulfides are involved in a broad range of radical-based synthetic organic and biochemical transformations. In particular, the reduction of a disulfide to the corresponding radical anion, followed by S-S bond cleavage to yield a thiyl radical and a thiolate anion plays critical roles in radical-based photoredox transformations and the disulfide radical anion in conjunction with a proton donor, mediates the enzymatic synthesis of deoxynucleotides from nucleotides within the active site of the enzyme, ribonucleotide reductase (RNR). To gain fundamental thermodynamic insight into these reactions, we have performed experimental measurements to furnish the transfer coefficient from which the standard E0(RSSR/RSSR˙-) reduction potential has been determined for a homologous series of disulfides. The electrochemical potentials are found to be strongly dependent on the structures and electronic properties of the substituents of the disulfides. In the case of cysteine, a standard potential of E0(RSSR/RSSR˙-) = -1.38 V vs. NHE is determined, making the disulfide radical anion of cysteine one of the most reducing cofactors in biology.
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Affiliation(s)
- Qilei Zhu
- Department of Chemistry and Chemical Biology, Harvard University 12 Oxford Street Cambridge Massachusetts 02138 USA
- Department of Chemistry, University of Utah Salt Lake City Utah 84112 USA
| | | | - JoAnne Stubbe
- Department of Chemistry and Chemical Biology, Harvard University 12 Oxford Street Cambridge Massachusetts 02138 USA
- Departments of Chemistry and Department of Biology, Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University 12 Oxford Street Cambridge Massachusetts 02138 USA
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6
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Hoar B, Zhang W, Xu S, Deeba R, Costentin C, Gu Q, Liu C. Electrochemical Mechanistic Analysis from Cyclic Voltammograms Based on Deep Learning. ACS Meas Sci Au 2022; 2:595-604. [PMID: 36573074 PMCID: PMC9783079 DOI: 10.1021/acsmeasuresciau.2c00045] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 08/18/2022] [Accepted: 08/19/2022] [Indexed: 05/09/2023]
Abstract
For decades, employing cyclic voltammetry for mechanistic investigation has demanded manual inspection of voltammograms. Here, we report a deep-learning-based algorithm that automatically analyzes cyclic voltammograms and designates a probable electrochemical mechanism among five of the most common ones in homogeneous molecular electrochemistry. The reported algorithm will aid researchers' mechanistic analyses, utilize otherwise elusive features in voltammograms, and experimentally observe the gradual mechanism transitions encountered in electrochemistry. An automated voltammogram analysis will aid the analysis of complex electrochemical systems and promise autonomous high-throughput research in electrochemistry with minimal human interference.
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Affiliation(s)
- Benjamin
B. Hoar
- Department
of Chemistry and Biochemistry, University
of California Los Angeles, Los Angeles, California 90095, United States
| | - Weitong Zhang
- Department
of Computer Science, University of California
Los Angeles, Los Angeles, California 90095, United States
| | - Shuangning Xu
- Department
of Chemistry and Biochemistry, University
of California Los Angeles, Los Angeles, California 90095, United States
| | - Rana Deeba
- Université
Grenoble Alpes, DCM, CNRS, 38000 Grenoble, France
| | - Cyrille Costentin
- Université
Grenoble Alpes, DCM, CNRS, 38000 Grenoble, France
- Université
Paris Cité, 75013 Paris, France
| | - Quanquan Gu
- Department
of Computer Science, University of California
Los Angeles, Los Angeles, California 90095, United States
| | - Chong Liu
- Department
of Chemistry and Biochemistry, University
of California Los Angeles, Los Angeles, California 90095, United States
- California
NanoSystems Institute, University of California
Los Angeles, Los Angeles, California 90095, United States
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7
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Guyot M, Lalloz MN, Aguirre-Araque JS, Rogez G, Costentin C, Chardon-Noblat S. Correction to “Rhenium Carbonyl Molecular Catalysts for CO 2 Electroreduction. Effects on Catalysis of Bipyridine Substituents Mimicking Anchorage Functions to Modify Electrodes”. Inorg Chem 2022; 61:18810. [DOI: 10.1021/acs.inorgchem.2c03700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Guyot M, Lalloz MN, Aguirre-Araque JS, Rogez G, Costentin C, Chardon-Noblat S. Rhenium Carbonyl Molecular Catalysts for CO 2 Electroreduction: Effects on Catalysis of Bipyridine Substituents Mimicking Anchorage Functions to Modify Electrodes. Inorg Chem 2022; 61:16072-16080. [PMID: 36166597 DOI: 10.1021/acs.inorgchem.2c02473] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Heterogenization of molecular catalysts on (photo)electrode surfaces is required to design devices performing processes enabling to store renewable energy in chemical bonds. Among the various strategies to immobilize molecular catalysts, direct chemical bonding to conductive surfaces presents some advantages because of the robustness of the linkage. When the catalyst is, as it is often the case, a transition metal complex, the anchoring group has to be connected to the complex through the ligands, and an important question is thus raised on the influence of this function on the redox and on the catalytic properties of the complex. Herein, we analyze the effect of conjugated and non conjugated substituents, structurally close to anchoring functions previously used to immobilize a rhenium carbonyl bipyridyl molecular catalyst for supported CO2 electroreduction. We show that carboxylic ester groups, mimicking anchoring the catalyst via carboxylate binding to the surface, have a drastic effect on the catalytic activity of the complex toward CO2 electroreduction. The reasons for such an effect are revealed via a combined spectro-electrochemical analysis showing that the reducing equivalents are mainly accumulated on the electron-withdrawing ester on the bipyridine ligand preventing the formation of the rhenium(0) center and its interaction with CO2. Alternatively, alkyl-phosphonic ester substituents, not conjugated with the bpy ligand, mimicking anchoring the catalyst via phosphonate binding to the surface, allow preserving the catalytic activity of the complex.
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Affiliation(s)
- Mélanie Guyot
- DCM, CNRS, Univ Grenoble Alpes, Grenoble 38000, France
| | | | | | - Guillaume Rogez
- CNRS, IPCMS, University of Strasbourg, Strasbourg 67034, France
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9
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Sun R, Liu M, Zheng SL, Dogutan DK, Costentin C, Nocera DG. Proton-coupled electron transfer of macrocyclic ring hydrogenation: The chlorinphlorin. Proc Natl Acad Sci U S A 2022; 119:e2122063119. [PMID: 35533271 PMCID: PMC9171799 DOI: 10.1073/pnas.2122063119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 03/07/2022] [Indexed: 11/18/2022] Open
Abstract
SignificanceThe chemical reduction of unsaturated bonds occurs by hydrogenation with H2 as the reductant. Conversely, in biology, the unavailability of H2 engenders the typical reduction of unsaturated bonds with electrons and protons from different cofactors, requiring olefin hydrogenation to occur by proton-coupled electron transfer (PCET). Moreover, the redox noninnocence of tetrapyrrole macrocycles furnishes unusual PCET intermediates, including the phlorin, which is an intermediate in tetrapyrrole ring reductions. Whereas the phlorin of a porphyrin is well established, the phlorin of a chlorin is enigmatic. By controlling the PCET reactivity of a chlorin, including the use of a hangman functionality to manage the proton transfer, the formation of a chlorinphlorin by PCET is realized, and the mechanism for its formation is defined.
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Affiliation(s)
- Rui Sun
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138
| | - Mengran Liu
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138
| | - Shao-Liang Zheng
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138
| | - Dilek K. Dogutan
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138
| | - Cyrille Costentin
- Université Grenoble Alpes, CNRS, Grenoble, 38000 France
- Université Paris Cité, Paris, 75013 France
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138
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10
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Costentin C, Camara F, Fortage J, Collomb MN. Photoinduced Catalysis of Redox Reactions. Turnover Numbers, Turnover Frequency, and Limiting Processes: Kinetic Analysis and Application to Light-Driven Hydrogen Production. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cyrille Costentin
- Univ Grenoble Alpes, DCM, CNRS, 38000 Grenoble, France
- Université Paris Cité, 75013 Paris, France
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11
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Deeba R, Chardon-Noblat S, Costentin C. Homogeneous molecular catalysis of the electrochemical reduction of N 2O to N 2: redox vs. chemical catalysis. Chem Sci 2021; 12:12726-12732. [PMID: 34703559 PMCID: PMC8494024 DOI: 10.1039/d1sc03044b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 08/24/2021] [Indexed: 12/20/2022] Open
Abstract
Homogeneous electrochemical catalysis of N2O reduction to N2 is investigated with a series of organic catalysts and rhenium and manganese bipyridyl carbonyl complexes. An activation-driving force correlation is revealed with the organic species characteristic of a redox catalysis involving an outer-sphere electron transfer from the radical anions or dianions of the reduced catalyst to N2O. Taking into account the previously estimated reorganization energy required to form the N2O radical anions leads to an estimation of the N2O/N2O˙− standard potential in acetonitrile electrolyte. The direct reduction of N2O at a glassy carbon electrode follows the same quadratic activation driving force relationship. Our analysis reveals that the catalytic effect of the mediators is due to a smaller reorganization energy of the homogeneous electron transfer than that of the heterogeneous one. The physical effect of “spreading” electrons in the electrolyte is shown to be unfavorable for the homogeneous reduction. Importantly, we show that the reduction of N2O by low valent rhenium and manganese bipyridyl carbonyl complexes is of a chemical nature, with an initial one-electron reduction process associated with a chemical reaction more efficient than the simple outer-sphere electron transfer process. This points to an inner-sphere mechanism possibly involving partial charge transfer from the low valent metal to the binding N2O and emphasizes the differences between chemical and redox catalytic processes. Homogeneous electrochemical catalysis of N2O reduction to N2 is investigated with a series of organic catalysts and rhenium and manganese bipyridyl carbonyl complexes.![]()
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Affiliation(s)
- Rana Deeba
- Univ Grenoble Alpes, DCM, CNRS 38000 Grenoble France
| | | | - Cyrille Costentin
- Univ Grenoble Alpes, DCM, CNRS 38000 Grenoble France .,Université de Paris 75013 Paris France
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12
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Deeba R, Chardon‐Noblat S, Costentin C. Molecular Catalysis of Electrochemical Reactions: Competition between Reduction of the Substrate and Deactivation of the Catalyst by a Cosubstrate Application to N
2
O Reduction. ChemElectroChem 2021. [DOI: 10.1002/celc.202101064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Rana Deeba
- Univ Grenoble Alpes DCM CNRS 38000 Grenoble France
| | | | - Cyrille Costentin
- Univ Grenoble Alpes DCM CNRS 38000 Grenoble France
- Université de Paris 75006 Paris France
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13
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Amatore C, Costentin C, Robert M. In Memoriam of Jean‐Michel Savéant (1933–2020). ChemElectroChem 2021. [DOI: 10.1002/celc.202100866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Christian Amatore
- PASTEUR, Départment de Chimie, École Normale Supérieure PSL Research University, Sorbonne University, UPMC Univ. Paris 06, CNRS 24 rue Lhomond 75005 Paris France
- State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Cyrille Costentin
- Université Grenoble Alpes, DCM, CNRS 38000 Grenoble France
- Université de Paris 75006 Paris France
| | - Marc Robert
- Université de Paris Laboratoire d'Electrochimie Moléculaire, CNRS F-75006 Paris France
- Institut Universitaire de France (IUF) F-75005 Paris France
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14
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Sun D, Karippara Harshan A, Pécaut J, Hammes‐Schiffer S, Costentin C, Artero V. Hydrogen Evolution Mediated by Cobalt Diimine‐Dioxime Complexes: Insights into the Role of the Ligand Acid/Base Functionalities. ChemElectroChem 2021. [DOI: 10.1002/celc.202100413] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Dongyue Sun
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 17 rue des Martyrs F-38054 Grenoble, Cedex France
| | - Aparna Karippara Harshan
- Department of Chemistry Pennsylvania State University University Park Pennsylvania 16802 United States
| | - Jacques Pécaut
- Univ. Grenoble Alpes CNRS CEA IRIG SyMMES 17 rue des Martyrs F-38054 Grenoble, Cedex France
| | | | - Cyrille Costentin
- Univ Grenoble Alpes CNRS DCM 38000 Grenoble France
- Université de Paris 75013 Paris France
| | - Vincent Artero
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 17 rue des Martyrs F-38054 Grenoble, Cedex France
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15
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Deeba R, Molton F, Chardon-Noblat S, Costentin C. Effective Homogeneous Catalysis of Electrochemical Reduction of Nitrous Oxide to Dinitrogen at Rhenium Carbonyl Catalysts. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01197] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Rana Deeba
- DCM, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
| | - Florian Molton
- DCM, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
| | | | - Cyrille Costentin
- DCM, CNRS, Université Grenoble Alpes, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
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16
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Affiliation(s)
- Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
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17
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Margarit CG, Asimow NG, Thorarinsdottir AE, Costentin C, Nocera DG. Impactful Role of Cocatalysts on Molecular Electrocatalytic Hydrogen Production. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00253] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Charles G. Margarit
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Naomi G. Asimow
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Agnes E. Thorarinsdottir
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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18
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Barbois S, Stürm N, Aron-Wisnewsky J, Clément K, Bedossa P, Genser L, Hilleret MN, Costentin C, Reche F, Arvieux C, Borel AL. Decision Tree for the Performance of Intraoperative Liver Biopsy During Bariatric Surgery. Obes Surg 2021; 31:2641-2648. [PMID: 33665755 DOI: 10.1007/s11695-021-05309-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/21/2021] [Accepted: 02/23/2021] [Indexed: 12/18/2022]
Abstract
BACKGROUND AND AIMS Bariatric surgery provides a useful opportunity to perform intraoperative liver biopsy to screen for non-alcoholic steatohepatitis (NASH). There is currently no consensus on whether intraoperative liver biopsy should be systematically performed. The aim of this study was to develop and validate a decision tree to guide that choice. APPROACH AND RESULTS This prospective study included 102 consecutive patients from the severe obesity outcome network (SOON) cohort in whom liver biopsy was systematically performed during bariatric surgery. A classification and regression tree (CART) was created to identify the nodes that best classified patients with and without NASH. External validation was performed. Seventy-one biopsies were of sufficient quality for analysis (median body mass index 43.3 [40.7; 48.0] kg/m2). NASH was diagnosed in 32.4% of cases. None of the patients with no steatosis on ultrasound had NASH. The only CART node that differentiated between a "high-risk" and a "low-risk" of NASH was alanine aminotransferase (ALT). ALT>53IU/L predicted NASH with a positive predictive value (PPV) of 68% and a negative predictive value (NPP) of 89%, a sensitivity of 77%, and a specificity of 84%. In the external cohort (n=258), PPV was 68%, NPV was 62%, sensitivity was 27%, and specificity was 90%. CONCLUSIONS The present work supports intraoperative liver biopsy to screen for NASH in patients with ALT>53IU/L; however, patients with no steatosis on ultrasound should not undergo biopsy. The CART failed to identify an algorithm with a good sensitivity to screen for NASH in patients with ultrasonography-proven steatosis and ALT≤53IU/L.
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Affiliation(s)
- Sandrine Barbois
- Department of Digestive Surgery, University Hospital Grenoble Alpes, 38043, Grenoble, France. .,Hypoxia Physiopathology (HP2) Laboratory, INSERM U1042, Grenoble Alpes University, 38043, Grenoble, France.
| | - N Stürm
- Department of Anatomopathology, University Hospital Grenoble Alpes, 38043, Grenoble, France
| | - J Aron-Wisnewsky
- INSERM, NutriOmics Research Unit, Sorbonne Université, Paris, France.,Assistance Publique Hôpitaux de Paris, Nutrition Department, Pitié-Salpêtrière Hospital, Sorbonne Université, Paris, France
| | - K Clément
- INSERM, NutriOmics Research Unit, Sorbonne Université, Paris, France.,Assistance Publique Hôpitaux de Paris, Nutrition Department, Pitié-Salpêtrière Hospital, Sorbonne Université, Paris, France
| | - P Bedossa
- Institute of Cellular Medicine, University of Newcastle, Newcastle upon Tyne, UK
| | - Laurent Genser
- INSERM, NutriOmics Research Unit, Sorbonne Université, Paris, France.,Assistance Publique Hôpitaux de Paris, Digestive Surgery Department, Pitié-Salpêtrière Hospital, Sorbonne Université, Paris, France
| | - M N Hilleret
- Department of Hepatology, University Hospital Grenoble Alpes, 38043, Grenoble, France
| | - C Costentin
- Department of Hepatology, University Hospital Grenoble Alpes, 38043, Grenoble, France
| | - F Reche
- Department of Digestive Surgery, University Hospital Grenoble Alpes, 38043, Grenoble, France
| | - C Arvieux
- Department of Digestive Surgery, University Hospital Grenoble Alpes, 38043, Grenoble, France
| | - A L Borel
- Hypoxia Physiopathology (HP2) Laboratory, INSERM U1042, Grenoble Alpes University, 38043, Grenoble, France.,Department of Nutrition, University Hospital Grenoble Alpes, 38043, Grenoble, France
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19
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Affiliation(s)
- Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250, 38000 Grenoble, France
- Université de Paris, F-75006 Paris, France
| | - Benoît Limoges
- Université de Paris, Laboratoire d’Electrochimie Moléculaire, CNRS, F-75006 Paris, France
| | - Marc Robert
- Université de Paris, Laboratoire d’Electrochimie Moléculaire, CNRS, F-75006 Paris, France
- Institut Universitaire de France, F-75005 Paris, France
| | - Cédric Tard
- Laboratoire de Chimie Moléculaire (LCM), CNRS, École Polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France
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20
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Abstract
The v/v1/2 scan rate diagnosis in electrochemical energy storage devices is based on application of the relationship i = k1v + k2v1/2 (where k1 and k2 are two constants independent of the scan rate v) to the variation of the cyclic voltammetric responses with v. Several examples show that application of this scan rate diagnosis procedure leads to absurd results because the procedure is inappropriate under these conditions. It follows that the best approach is to simply forget about this v/v1/2 scan rate diagnosis, concentrate on the maximum number of experimental observations of the scan rate dependency, and build models able to reproduce these data in each case.
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Affiliation(s)
- Cyrille Costentin
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
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21
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Zhang BA, Costentin C, Nocera DG. Driving force dependence of inner-sphere electron transfer for the reduction of CO 2 on a gold electrode. J Chem Phys 2020; 153:094701. [PMID: 32891100 DOI: 10.1063/5.0016298] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The kinetics of the inner-sphere electron transfer reaction between a gold electrode and CO2 was measured as a function of the applied potential in an aqueous environment. Extraction of the electron transfer rate constant requires deconvolution of the current associated with CO2 reduction from the competing hydrogen evolution reaction and mass transport. Analysis of the inner-sphere electron transfer reaction reveals a driving force dependence of the rate constant that has similar characteristics to that of a Marcus-Hush-Levich outer-sphere electron transfer model. Consideration of simple assumptions for CO2 adsorption on the electrode surface allows for the evaluation of a CO2,ads/CO2 •- ads standard potential of ∼-0.75 ± 0.05 V vs Standard Hydrogen Electrode (SHE) and a reorganization energy on the order of 0.75 ± 0.10 eV. This standard potential is considerably lower than that observed for CO2 reduction on planar metal electrodes (∼>-1.4 V vs SHE for >10 mA/cm2), thus indicating that CO2 reduction occurs at a significant overpotential and thus provides an imperative for the design of better CO2 reduction electrocatalysts.
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Affiliation(s)
- Benjamin A Zhang
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA
| | - Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250, 38000 Grenoble, France
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA
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Abstract
Electrophotocatalysis (e-PC) is currently experiencing a renewed interest. By taking advantage of the highly oxidizing or reducing power of excited state of electrogenerated ion radicals, it allows thermodynamically difficult redox reactions to be performed. However, e-PC is facing various specific issues, such as its fundamentally heterogeneous nature, implying that mass transport is coupled to chemical reactions and light absorption; back electron transfer of the ion radical excited state with the electrode; and local heating near the electrode surface modifying mass transport conditions. Herein, we address these issues in the context of cyclic voltammetry as an analytical tool and we provide a rational framework for kinetic studies of electrophotocatalytic reactions under realistic conditions and hypothesis based on literature data. This approach may be beneficial to rationalize the design and the efficiency of present and future e-PC systems.
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Affiliation(s)
- Cyrille Costentin
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
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23
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Affiliation(s)
- Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
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24
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Costentin C. Proton-Coupled Electron Transfer Catalyst: Homogeneous Catalysis. Application to the Catalysis of Electrochemical Alcohol Oxidation in Water. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01195] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
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25
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Abstract
A recent remarkable study of the C-H oxidation of substituted fluorenyl-benzoates together with the transfer of a proton to an internal receiving group by means of electron transfer outer-sphere oxidants, in the noteworthy absence of hydrogen-bonding interactions, is taken as an example to uncover the existence of a mechanism crossover, making the reaction pass from a CPET pathway to a PTET pathway as the driving force of the global reaction decreases. This was also the occasion to stress that considerations based on "imbalanced" or "asynchronous" transition states cannot replace activation/driving force models based on the quantum mechanical treatment of both electrons and transferring protons.
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Affiliation(s)
- Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250 38000 Grenoble France .,Université Paris Diderot, Sorbonne Paris Cité 75205 Paris Cedex 13 France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No. 7591 Bâtiment Lavoisier, 15 rue Jean de Baïf 75205 Paris Cedex 13 France
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26
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Costentin C, Porter TR, Savéant JM. Nature of Electronic Conduction in "Pseudocapacitive" Films: Transition from the Insulator State to Band-Conduction. ACS Appl Mater Interfaces 2019; 11:28769-28773. [PMID: 31311266 DOI: 10.1021/acsami.9b05240] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The transition between the insulator state and the band-conducting state is investigated by means of cyclic voltammetry in cobalt oxide porous film electrodes in phosphate-buffered solutions. It is shown that a proton-coupled faradaic oxidative process starting in the insulator region eventually builds an ohmic conduction mode upon anodic polarization. This model allows one to understand the origin of the authentic capacitive behavior of conductive metal oxide films rather than the so-called "pseudocapacitive" behavior. The particular example of cobalt oxide serves to illustrate the way in which, more generally, the behavior of "pseudocapacitors", long ascribed to the superposition of faradaic reactions, is in fact that of true capacitors, once band-conduction has been established upon oxidation of the material.
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Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No 7591 , Bâtiment Lavoisier, 15 rue Jean de Baïf , 75205 Paris Cedex 13, France
| | - Thomas R Porter
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No 7591 , Bâtiment Lavoisier, 15 rue Jean de Baïf , 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No 7591 , Bâtiment Lavoisier, 15 rue Jean de Baïf , 75205 Paris Cedex 13, France
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27
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Zhang B, Ozel T, Elias JS, Costentin C, Nocera DG. Interplay of Homogeneous Reactions, Mass Transport, and Kinetics in Determining Selectivity of the Reduction of CO 2 on Gold Electrodes. ACS Cent Sci 2019; 5:1097-1105. [PMID: 31263769 PMCID: PMC6598161 DOI: 10.1021/acscentsci.9b00302] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Indexed: 05/13/2023]
Abstract
Gold electrocatalysts have been a research focus due to their ability to reduce CO2 into CO, a feedstock for further conversion. Many methods have been employed to modulate CO2 reduction (CDR) vs hydrogen evolution reaction (HER) selectivity on gold electrodes such as nano-/mesostructuring and crystal faceting control. Herein we show that gold surfaces with very different morphologies (planar, leaves, and wires) lead to similar bell-shaped CO faradaic efficiency as a function of applied potential. At low overpotential (E > -0.85 V vs standard hydrogen electrode (SHE)), HER is dominant via a potential quasi-independent rate that we attribute to a rate limiting process of surface dissociation of competent proton donors. As overpotential is increased, CO faradaic efficiency reaches a maximal value (near 90%) because CO production is controlled by an electron transfer rate that increases with potential, whereas HER remains almost potential independent. At high overpotential (E < -1.2 V vs SHE), CO faradaic efficiency decreases due to the concurrent rise of HER via bicarbonate direct reduction and leveling off of CDR as CO2 replenishment at the catalyst surface is limited by mass transport and homogeneous coupled reactions. Importantly, the analysis shows that recent attempts to overcome mass transport limitations with gas diffusion electrodes confront low carbon mass balance owing to the prominence of homogeneous reactions coupled to CDR. The comprehensive kinetics analysis of the factors defining CDR vs HER on gold electrodes developed here provides an activation-driving force relationship over a large potential window and informs on the design of conditions to achieve desirable high current densities for CO2 to CO conversion while maintaining high selectivity.
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Affiliation(s)
- Benjamin
A. Zhang
- Department
of Chemistry and Chemical Biology, Harvard
University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Tuncay Ozel
- Department
of Chemistry and Chemical Biology, Harvard
University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Joseph S. Elias
- Department
of Chemistry and Chemical Biology, Harvard
University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Cyrille Costentin
- Department
of Chemistry and Chemical Biology, Harvard
University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
- Laboratoire
d’Electrochimie Moléculaire, Unité Mixte de Recherche Université, CNRS No. 7591, Bâtiment Lavoisier, Université
Paris Diderot, Sorbonne Paris Cité, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
- (C.C.) E-mail:
| | - Daniel G. Nocera
- Department
of Chemistry and Chemical Biology, Harvard
University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
- (D.G.N.) E-mail:
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28
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Abstract
This question and its implications are discussed in detail.
The two main types of charge storage devices – batteries and double layer charging capacitors – can be unambiguously distinguished from one another by the shape and scan rate dependence of their cyclic voltammetric current–potential (CV) responses. This is not the case with “pseudocapacitors” and with the notion of “pseudocapacitance”, as originally put forward by Conway et al. After insisting on the necessity of precisely defining “pseudocapacitance” as involving faradaic processes and having, at the same time, a capacitive signature, we discuss the modelling of “pseudocapacitive” responses, revisiting Conway's derivations and analysing critically the other contributions to the subject, leading unmistakably to the conclusion that “pseudocapacitors” are actually true capacitors and that “pseudocapacitance” is a basically incorrect notion. Taking cobalt oxide films as a tutorial example, we describe the way in which a (true) electrical double layer is built upon oxidation of the film in its insulating state up to an ohmic conducting state. The lessons drawn at this occasion are used to re-examine the classical oxides, RuO2, MnO2, TiO2, Nb2O5 and other examples of putative “pseudocapacitive” materials. Addressing the dynamics of charge storage—a key issue in the practice of power of the energy storage device—it is shown that ohmic potential drop in the pores is the governing factor rather than counter-ion diffusion as often asserted, based on incorrect diagnosis by means of scan rate variations in CV studies.
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Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité , Laboratoire d'Electrochimie Moléculaire , Unité Mixte de Recherche Université - CNRS No. 7591 , Bâtiment Lavoisier, 15 rue Jean de Baïf , 75205 Paris Cedex 13 , France . ;
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité , Laboratoire d'Electrochimie Moléculaire , Unité Mixte de Recherche Université - CNRS No. 7591 , Bâtiment Lavoisier, 15 rue Jean de Baïf , 75205 Paris Cedex 13 , France . ;
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29
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Sun R, Qin Y, Ruccolo S, Schnedermann C, Costentin C, Nocera DG. Elucidation of a Redox-Mediated Reaction Cycle for Nickel-Catalyzed Cross Coupling. J Am Chem Soc 2018; 141:89-93. [DOI: 10.1021/jacs.8b11262] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rui Sun
- Department of Chemistry and Chemical Biology, Harvard University
, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Yangzhong Qin
- Department of Chemistry and Chemical Biology, Harvard University
, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Serge Ruccolo
- Department of Chemistry and Chemical Biology, Harvard University
, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Christoph Schnedermann
- Department of Chemistry and Chemical Biology, Harvard University
, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Cyrille Costentin
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université − CNRS No. 7591, Bâtiment Lavoisier, Université Paris Diderot, Sorbonne Paris Cité
, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University
, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
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30
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Costentin C, Savéant JM. Homogeneous Molecular Catalysis of Electrochemical Reactions: Manipulating Intrinsic and Operational Factors for Catalyst Improvement. J Am Chem Soc 2018; 140:16669-16675. [DOI: 10.1021/jacs.8b09154] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne
Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS No. 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Cedex 13 Paris, France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne
Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS No. 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Cedex 13 Paris, France
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31
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Elias JS, Costentin C, Nocera DG. Direct Electrochemical P(V) to P(III) Reduction of Phosphine Oxide Facilitated by Triaryl Borates. J Am Chem Soc 2018; 140:13711-13718. [DOI: 10.1021/jacs.8b07149] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joseph S. Elias
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Cyrille Costentin
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université−CNRS 7591, Université Paris Diderot, Sorbonne Paris Cité, 75205 Paris Cedex 13, France
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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32
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Brodsky CN, Passard G, Ullman AM, Jaramillo DE, Bloch ED, Huynh M, Gygi D, Costentin C, Nocera DG. Oxygen activation at a dicobalt centre of a dipyridylethane naphthyridine complex. Dalton Trans 2018; 47:11903-11908. [PMID: 29942938 DOI: 10.1039/c8dt01598h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The mechanism of oxygen activation at a dicobalt bis-μ-hydroxo core is probed by the implementation of synthetic methods to isolate reaction intermediates. Reduction of a dicobalt(iii,iii) core ligated by the polypyridyl ligand dipyridylethane naphthyridine (DPEN) by two electrons and subsequent protonation result in the release of one water moiety to furnish a dicobalt(ii,ii) center with an open binding site. This reduced core may be independently isolated by chemical reduction. Variable-temperature 1H NMR and SQUID magnetometry reveal the reduced dicobalt(ii,ii) intermediate to consist of two low spin Co(ii) centers coupled antiferromagnetically. Binding of O2 to the open coordination site of the dicobalt(ii,ii) core results in the production of an oxygen adduct, which is proposed to be a dicobalt(iii,iii) peroxo. Electrochemical studies show that the addition of two electrons results in cleavage of the O-O bond.
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Affiliation(s)
- Casey N Brodsky
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
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Affiliation(s)
- Guillaume Passard
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Dilek K. Dogutan
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Mengting Qiu
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Cyrille Costentin
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No. 7591, Bâtiment Lavoisier, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
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34
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Affiliation(s)
- Cyrille Costentin
- Sorbonne Paris Cité, Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS N° 7591, Bâtiment Lavoisier, Université Paris Diderot, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Sorbonne Paris Cité, Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS N° 7591, Bâtiment Lavoisier, Université Paris Diderot, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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35
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Lee W, Kasanmascheff M, Huynh M, Quartararo A, Costentin C, Bejenke I, Nocera DG, Bennati M, Tommos C, Stubbe J. Properties of Site-Specifically Incorporated 3-Aminotyrosine in Proteins To Study Redox-Active Tyrosines: Escherichia coli Ribonucleotide Reductase as a Paradigm. Biochemistry 2018; 57:3402-3415. [PMID: 29630358 DOI: 10.1021/acs.biochem.8b00160] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
3-Aminotyrosine (NH2Y) has been a useful probe to study the role of redox active tyrosines in enzymes. This report describes properties of NH2Y of key importance for its application in mechanistic studies. By combining the tRNA/NH2Y-RS suppression technology with a model protein tailored for amino acid redox studies (α3X, X = NH2Y), the formal reduction potential of NH2Y32(O•/OH) ( E°' = 395 ± 7 mV at pH 7.08 ± 0.05) could be determined using protein film voltammetry. We find that the Δ E°' between NH2Y32(O•/OH) and Y32(O•/OH) when measured under reversible conditions is ∼300-400 mV larger than earlier estimates based on irreversible voltammograms obtained on aqueous NH2Y and Y. We have also generated D6-NH2Y731-α2 of ribonucleotide reductase (RNR), which when incubated with β2/CDP/ATP generates the D6-NH2Y731•-α2/β2 complex. By multifrequency electron paramagnetic resonance (35, 94, and 263 GHz) and 34 GHz 1H ENDOR spectroscopies, we determined the hyperfine coupling (hfc) constants of the amino protons that establish RNH2• planarity and thus minimal perturbation of the reduction potential by the protein environment. The amount of Y in the isolated NH2Y-RNR incorporated by infidelity of the tRNA/NH2Y-RS pair was determined by a generally useful LC-MS method. This information is essential to the utility of this NH2Y probe to study any protein of interest and is employed to address our previously reported activity associated with NH2Y-substituted RNRs.
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Affiliation(s)
| | - Müge Kasanmascheff
- Max Planck Institute for Biophysical Chemistry , Am Fassberg 11 , Göttingen , 37077 Germany
| | - Michael Huynh
- Department of Chemistry and Chemical Biology , Harvard University , 12 Oxford Street , Cambridge , Massachusetts 02138 United States
| | | | - Cyrille Costentin
- Department of Chemistry and Chemical Biology , Harvard University , 12 Oxford Street , Cambridge , Massachusetts 02138 United States.,Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No 7591 , Université Paris Diderot, Sorbonne Paris Cité , Bâtiment Lavoisier, 15 rue Jean de Baïf , 75205 Paris Cedex 13 , France
| | - Isabel Bejenke
- Max Planck Institute for Biophysical Chemistry , Am Fassberg 11 , Göttingen , 37077 Germany
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology , Harvard University , 12 Oxford Street , Cambridge , Massachusetts 02138 United States
| | - Marina Bennati
- Max Planck Institute for Biophysical Chemistry , Am Fassberg 11 , Göttingen , 37077 Germany
| | - Cecilia Tommos
- Department of Biochemistry and Biophysics , University of Pennsylvania Perelman School of Medicine , Philadelphia , Pennsylvania 19104 , United States
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36
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Chaguetmi S, Chaperman L, Nowak S, Schaming D, Lau-Truong S, Decorse P, Beaunier P, Costentin C, Mammeri F, Achour S, Ammar S. Photoelectrochemical properties of ZnS- and CdS-TiO2 nanostructured photocatalysts: Aqueous sulfidation as a smart route to improve catalyst stability. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.01.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Costentin C, Di Giovanni C, Giraud M, Savéant JM, Tard C. Nanodiffusion in electrocatalytic films. Nat Mater 2017; 16:1016-1021. [PMID: 28825730 DOI: 10.1038/nmat4968] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 07/17/2017] [Indexed: 06/07/2023]
Abstract
In the active interest aroused by electrochemical reactions' catalysis, related to modern energy challenges, films deposited on electrodes are often preferred to homogeneous catalysts. A particularly promising variety of such films, in terms of efficiency and selectivity, is offered by sprinkling catalytic nanoparticles onto a conductive network. Coupled with the catalytic reaction, the competitive occurrence of various modes of substrate diffusion-diffusion toward nanoparticles ('nanodiffusion') against film linear diffusion and solution linear diffusion-is analysed theoretically. It is governed by a dimensionless parameter that contains all the experimental factors, thus allowing one to single out the conditions in which nanodiffusion is the dominant mode of mass transport. These theoretical predictions are illustrated experimentally by proton reduction on a mixture of platinum nanoparticles and carbon dispersed in a Nafion film deposited on a glassy carbon electrode. The density of nanoparticles and the scan rate are used as experimental variables to test the theory.
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Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS No 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Carlo Di Giovanni
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS No 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Marion Giraud
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire ITODYS, Unité Mixte de Recherche Université-CNRS No 7086, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS No 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Cédric Tard
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS No 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Dridi H, Comminges C, Morais C, Meledje JC, Kokoh KB, Costentin C, Savéant JM. Catalysis and Inhibition in the Electrochemical Reduction of CO2 on Platinum in the Presence of Protonated Pyridine. New Insights into Mechanisms and Products. J Am Chem Soc 2017; 139:13922-13928. [DOI: 10.1021/jacs.7b08028] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Hachem Dridi
- Sorbonne
Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS no. 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Clément Comminges
- IC2MP
UMR-CNRS 7285, Université de Poitiers, 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Claudia Morais
- IC2MP
UMR-CNRS 7285, Université de Poitiers, 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Jean-Claude Meledje
- Sorbonne
Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS no. 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Kouakou Boniface Kokoh
- IC2MP
UMR-CNRS 7285, Université de Poitiers, 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Cyrille Costentin
- Sorbonne
Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS no. 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Sorbonne
Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS no. 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Kim YS, Balland V, Limoges B, Costentin C. Cyclic voltammetry modeling of proton transport effects on redox charge storage in conductive materials: application to a TiO 2 mesoporous film. Phys Chem Chem Phys 2017; 19:17944-17951. [PMID: 28664973 DOI: 10.1039/c7cp02810e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyclic voltammetry is a particularly useful tool for characterizing charge accumulation in conductive materials. A simple model is presented to evaluate proton transport effects on charge storage in conductive materials associated with a redox process coupled with proton insertion in the bulk material from an aqueous buffered solution, a situation frequently encountered in metal oxide materials. The interplay between proton transport inside and outside the materials is described using a formulation of the problem through introduction of dimensionless variables that allows defining the minimum number of parameters governing the cyclic voltammetry response with consideration of a simple description of the system geometry. This approach is illustrated by analysis of proton insertion in a mesoporous TiO2 film.
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Affiliation(s)
- Y S Kim
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France.
| | - V Balland
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France.
| | - B Limoges
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France.
| | - C Costentin
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France.
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Costentin C, Savéant JM. Catalysis of Electrochemical Reactions by Surface-Active Sites: Analyzing the Occurrence and Significance of Volcano Plots by Cyclic Voltammetry. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01529] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Cyrille Costentin
- Sorbonne Paris Cité,
Laboratoire d’Electrochimie Moléculaire, Unité
Mixte de Recherche Université−CNRS 7591, Bâtiment
Lavoisier, Université Paris Diderot, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Sorbonne Paris Cité,
Laboratoire d’Electrochimie Moléculaire, Unité
Mixte de Recherche Université−CNRS 7591, Bâtiment
Lavoisier, Université Paris Diderot, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Costentin C, Savéant JM. Heterogeneous Molecular Catalysis of Electrochemical Reactions: Volcano Plots and Catalytic Tafel Plots. ACS Appl Mater Interfaces 2017; 9:19894-19899. [PMID: 28530798 DOI: 10.1021/acsami.7b04349] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We analyze here, in the framework of heterogeneous molecular catalysis, the reasons for the occurrence or nonoccurrence of volcanoes upon plotting the kinetics of the catalytic reaction versus the stabilization free energy of the primary intermediate of the catalytic process. As in the case of homogeneous molecular catalysis or catalysis by surface-active metallic sites, a strong motivation of such studies relates to modern energy challenges, particularly those involving small molecules, such as water, hydrogen, oxygen, proton, and carbon dioxide. This motivation is particularly pertinent for what concerns heterogeneous molecular catalysis, since it is commonly preferred to homogeneous molecular catalysis by the same molecules if only for chemical separation purposes and electrolytic cell architecture. As with the two other catalysis modes, the main drawback of the volcano plot approach is the basic assumption that the kinetic responses depend on a single descriptor, viz., the stabilization free energy of the primary intermediate. More comprehensive approaches, investigating the responses to the maximal number of experimental factors, and conveniently expressed as catalytic Tafel plots, should clearly be preferred. This is more so in the case of heterogeneous molecular catalysis in that additional transport factors in the supporting film may additionally affect the current-potential responses. This is attested by the noteworthy presence of maxima in catalytic Tafel plots as well as their dependence upon the cyclic voltammetric scan rate.
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Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS 7591, Bâtiment Lavoisier, 15 Rue Jean de Baïf, 75205 Cedex 13, Paris, France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS 7591, Bâtiment Lavoisier, 15 Rue Jean de Baïf, 75205 Cedex 13, Paris, France
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Costentin C, Savéant JM. Homogeneous Molecular Catalysis of Electrochemical Reactions: Catalyst Benchmarking and Optimization Strategies. J Am Chem Soc 2017; 139:8245-8250. [DOI: 10.1021/jacs.7b02879] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire
d’Electrochimie Moléculaire, Unité Mixte de Recherche
Université—CNRS No. 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire
d’Electrochimie Moléculaire, Unité Mixte de Recherche
Université—CNRS No. 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Costentin C, Porter TR, Savéant JM. How Do Pseudocapacitors Store Energy? Theoretical Analysis and Experimental Illustration. ACS Appl Mater Interfaces 2017; 9:8649-8658. [PMID: 28195702 DOI: 10.1021/acsami.6b14100] [Citation(s) in RCA: 111] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Batteries and electrochemical double layer charging capacitors are two classical means of storing electrical energy. These two types of charge storage can be unambiguously distinguished from one another by the shape and scan-rate dependence of their cyclic voltammetric (CV) current-potential responses. The former shows peak-shaped current-potential responses, proportional to the scan rate v or to v1/2, whereas the latter displays a quasi-rectangular response proportional to the scan rate. On the contrary, the notion of pseudocapacitance, popularized in the 1980s and 1990s for metal oxide systems, has been used to describe a charge storage process that is faradaic in nature yet displays capacitive CV signatures. It has been speculated that a quasi-rectangular CV response resembling that of a truly capacitive response arises from a series of faradaic redox couples with a distribution of potentials, yet this idea has never been justified theoretically. We address this problem by first showing theoretically that this distribution-of-potentials approach is closely equivalent to the more physically meaningful consideration of concentration-dependent activity coefficients resulting from interactions between reactants. The result of the ensuing analysis is that, in either case, the CV responses never yield a quasi-rectangular response ∝ ν, identical to that of double layer charging. Instead, broadened peak-shaped responses are obtained. It follows that whenever a quasi-rectangular CV response proportional to scan rate is observed, such reputed pseudocapacitive behaviors should in fact be ascribed to truly capacitive double layer charging. We compare these results qualitatively with pseudocapacitor reports taken from the literature, including the classic RuO2 and MnO2 examples, and we present a quantitative analysis with phosphate cobalt oxide films. Our conclusions do not invalidate the numerous experimental studies carried out under the pseudocapacitance banner but rather provide a correct framework for their interpretation, allowing the dissection and optimization of charging rates on sound bases.
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Affiliation(s)
- Cyrille Costentin
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université CNRS 7591, Université Paris Diderot, Sorbonne Paris Cité , Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Thomas R Porter
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université CNRS 7591, Université Paris Diderot, Sorbonne Paris Cité , Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université CNRS 7591, Université Paris Diderot, Sorbonne Paris Cité , Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Azcarate I, Costentin C, Robert M, Savéant JM. Through-Space Charge Interaction Substituent Effects in Molecular Catalysis Leading to the Design of the Most Efficient Catalyst of CO 2-to-CO Electrochemical Conversion. J Am Chem Soc 2016; 138:16639-16644. [PMID: 27976580 DOI: 10.1021/jacs.6b07014] [Citation(s) in RCA: 350] [Impact Index Per Article: 43.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The starting point of this study of through-space substituent effects on the catalysis of the electrochemical CO2-to-CO conversion by iron(0) tetraphenylporphyrins is the linear free energy correlation between through-structure electronic effects and the iron(I/0) standard potential that we established separately. The introduction of four positively charged trimethylanilinium groups at the para positions of the tetraphenylporphyrin (TPP) phenyls results in an important positive deviation from the correlation and a parallel improvement of the catalytic Tafel plot. The assignment of this catalysis boosting effect to the Coulombic interaction of these positive charges with the negative charge borne by the initial Fe0-CO2 adduct is confirmed by the negative deviation observed when the four positive charges are replaced by four negative charges borne by sulfonate groups also installed in the para positions of the TPP phenyls. The climax of this strategy of catalysis boosting by means of Coulombic stabilization of the initial Fe0-CO2 adduct is reached when four positively charged trimethylanilinium groups are introduced at the ortho positions of the TPP phenyls. The addition of a large concentration of a weak acid-phenol-helps by cleaving one of the C-O bonds of CO2. The efficiency of the resulting catalyst is unprecedented, as can be judged by the catalytic Tafel plot benchmarking with all presently available catalysts of the electrochemical CO2-to-CO conversion. The maximal turnover frequency (TOF) is as high as 106 s-1 and is reached at an overpotential of only 220 mV; the extrapolated TOF at zero overpotential is larger than 300 s-1. This catalyst leads to a highly selective formation of CO (practically 100%) in spite of the presence of a high concentration of phenol, which could have favored H2 evolution. It is also very stable, showing no significant alteration after more than 80 h of electrolysis.
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Affiliation(s)
- Iban Azcarate
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No. 7591, Université Paris Diderot, Sorbonne Paris Cité , Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Cyrille Costentin
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No. 7591, Université Paris Diderot, Sorbonne Paris Cité , Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Marc Robert
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No. 7591, Université Paris Diderot, Sorbonne Paris Cité , Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No. 7591, Université Paris Diderot, Sorbonne Paris Cité , Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Costentin C, Porter TR, Savéant JM. Conduction and Reactivity in Heterogeneous-Molecular Catalysis: New Insights in Water Oxidation Catalysis by Phosphate Cobalt Oxide Films. J Am Chem Soc 2016; 138:5615-22. [DOI: 10.1021/jacs.6b00737] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie
Moléculaire, Unité Mixte de Recherche Université−CNRS
No. 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Thomas R. Porter
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie
Moléculaire, Unité Mixte de Recherche Université−CNRS
No. 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie
Moléculaire, Unité Mixte de Recherche Université−CNRS
No. 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Costentin C, Robert M, Savéant JM. Current Issues in Molecular Catalysis Illustrated by Iron Porphyrins as Catalysts of the CO2-to-CO Electrochemical Conversion. Acc Chem Res 2015; 48:2996-3006. [PMID: 26559053 DOI: 10.1021/acs.accounts.5b00262] [Citation(s) in RCA: 199] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Recent attention aroused by the reduction of carbon dioxide has as main objective the production of useful products, the "solar fuels", in which solar energy would be stored. One route to this goal is the design of photochemical schemes that would operate this conversion using directly sun light energy. An indirect approach consists in first converting sunlight energy into electricity then using it to reduce CO2 electrochemically. Conversion of carbon dioxide into carbon monoxide is thus a key step through the classical dihydrogen-reductive Fischer-Tropsch chemistry. Direct and catalytic electrochemical CO2 reduction already aroused active interest during the 1980-1990 period. The new wave of interest for these matters that has been growing since 2012 is in direct conjunction with modern energy issues. Among molecular catalysts, electrogenerated Fe(0) porphyrins have proved to be particularly efficient and robust. Recent progress in this field has closely associated the search of more and more efficient catalysts in the iron porphyrin family with an unprecedentedly rigorous deciphering of mechanisms. Accordingly, the coupling of proton transfer with electron transfer and breaking of one of the two C-O bonds of CO2 have been the subjects of relentless scrutiny and mechanistic analysis with systematic investigation of the degree of concertedness of these three events. Catalysis of the electrochemical CO2-to-CO conversion has thus been a good testing ground for the mechanism diagnostic strategies and the all concerted reactivity model proposed then. The role of added Brönsted acids, both as H-bond providers and proton donors, has been elucidated. These efforts have been a preliminary to the inclusion of the acid functionalities within the catalyst molecule, giving rise to considerable increase of the catalytic efficiency. The design of more and more efficient catalysts made it necessary to propose "catalytic Tafel plots" relating the turnover frequency to the overpotential as a rational way of benchmarking the catalysts within iron porphyrins and among all available molecular catalysts, independently of the characteristics of the electrolytic cell in use. To be reliable, such assignments of the intrinsic characteristics of catalysts are grounded in the accurate elucidation of mechanisms. Without forgetting the importance of large scale electrolysis, not only mobilization of all resources of nondestructive techniques such as cyclic voltammetry was necessary to achieve this challenge, but also new approaches, such as foot-of-the-wave analysis combined with raising of scan rate, had to be applied. The latest improvement in catalyst design was to render it water-soluble while preserving, or even augmenting, its catalytic efficiency. The replacement of the nonaqueous solvents so far used by water makes the CO2-to-CO half-cell reaction much more attractive for applications, allowing its association with a water-oxidation anode through a proton-exchange membrane. Manipulation of pH and buffering then allow CO2-to-CO conversions from those involving complete CO-selectivity to ones with prescribed CO-H2 mixtures. Overall, it appears that not only are iron porphyrins the most efficient catalysts of the CO2-to-CO electrochemical conversion but also they can serve to illustrate general issues concerning the field of molecular catalysis as a whole, including other reductive or oxidative processes.
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Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS No. 7591,
Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Cedex
13 Paris, France
| | - Marc Robert
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS No. 7591,
Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Cedex
13 Paris, France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie Moléculaire,
Unité Mixte de Recherche Université - CNRS No. 7591,
Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Cedex
13 Paris, France
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Costentin C, Dridi H, Savéant JM. Molecular Catalysis of O2 Reduction by Iron Porphyrins in Water: Heterogeneous versus Homogeneous Pathways. J Am Chem Soc 2015; 137:13535-44. [DOI: 10.1021/jacs.5b06834] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Cyrille Costentin
- Sorbonne Paris Cité,
Laboratoire d’Electrochimie Moléculaire, Unité
Mixte de Recherche Université − CNRS No. 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Cedex 13 Paris, France
| | - Hachem Dridi
- Sorbonne Paris Cité,
Laboratoire d’Electrochimie Moléculaire, Unité
Mixte de Recherche Université − CNRS No. 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Cedex 13 Paris, France
| | - Jean-Michel Savéant
- Sorbonne Paris Cité,
Laboratoire d’Electrochimie Moléculaire, Unité
Mixte de Recherche Université − CNRS No. 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Cedex 13 Paris, France
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Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité; Laboratoire d'Electrochimie Moléculaire; Unité Mixte de Recherche Université-CNRS N° 7591, Bâtiment Lavoisier, 15; rue Jean de Baïf 75205 Paris Cedex 13 France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité; Laboratoire d'Electrochimie Moléculaire; Unité Mixte de Recherche Université-CNRS N° 7591, Bâtiment Lavoisier, 15; rue Jean de Baïf 75205 Paris Cedex 13 France
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Costentin C, Passard G, Savéant JM. Benchmarking of homogeneous electrocatalysts: overpotential, turnover frequency, limiting turnover number. J Am Chem Soc 2015; 137:5461-7. [PMID: 25757058 DOI: 10.1021/jacs.5b00914] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In relation to contemporary energy challenges, a number of molecular catalysts for the activation of small molecules, mainly based on transition metal complexes, have been developed. The time has thus come to develop tools allowing the benchmarking of these numerous catalysts. Two main factors of merit are addressed. One involves their intrinsic catalytic performances through the comparison of "catalytic Tafel plots" relating the turnover frequency to the overpotential independently of the characteristics of the electrochemical cell. The other examines the effect of deactivation of the catalyst during the course of electrolysis. It introduces the notion of the limiting turnover number as a second key element of catalyst benchmarking. How these two factors combine with one another to control the course of electrolysis is analyzed in detail, leading to procedures that allow their separate estimation from measurements of the current, the charge passed, and the decay of the catalyst concentration. Illustrative examples from literature data are discussed.
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Affiliation(s)
- Cyrille Costentin
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS N° 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Guillaume Passard
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS N° 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS N° 7591, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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