1
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Scardamaglia M, Casanova-Cháfer J, Temperton R, Annanouch FE, Mohammadpour A, Malandra G, Das A, Alagh A, Arbouch I, Montoisy L, Cornil D, Cornil J, Llobet E, Bittencourt C. Operando Investigation of WS 2 Gas Sensors: Simultaneous Ambient Pressure X-ray Photoelectron Spectroscopy and Electrical Characterization in Unveiling Sensing Mechanisms during Toxic Gas Exposure. ACS Sens 2024; 9:4079-4088. [PMID: 39057835 PMCID: PMC11348423 DOI: 10.1021/acssensors.4c01033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 07/12/2024] [Accepted: 07/19/2024] [Indexed: 07/28/2024]
Abstract
Ambient pressure X-ray photoelectron spectroscopy (APXPS) is combined with simultaneous electrical measurements and supported by density functional theory calculations to investigate the sensing mechanism of tungsten disulfide (WS2)-based gas sensors in an operando dynamic experiment. This approach allows for the direct correlation between changes in the surface potential and the resistivity of the WS2 sensing active layer under realistic operating conditions. Focusing on the toxic gases NO2 and NH3, we concurrently demonstrate the distinct chemical interactions between oxidizing or reducing agents and the WS2 active layer and their effect on the sensor response. The experimental setup mimics standard electrical measurements on chemiresistors, exposing the sample to dry air and introducing the target gas analyte at different concentrations. This methodology applied to NH3 concentrations of 100, 230, and 760 and 14 ppm of NO2 establishes a benchmark for future APXPS studies on sensing devices, providing fast acquisition times and a 1:1 correlation between electrical response and spectroscopy data in operando conditions. Our findings contribute to a deeper understanding of the sensing mechanism in 2D transition metal dichalcogenides, paving the way for optimizing chemiresistor sensors for various industrial applications and wireless platforms with low energy consumption.
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Affiliation(s)
| | - Juan Casanova-Cháfer
- Departament
d’Enginyeria Electronica, Universitat
Rovira i Virgili, Països Catalans 26, 43007 Tarragona, Spain
- Chimie
des Interactions Plasma Surface, Institut Matériaux, Université de Mons, Place du Parc 23, 7000 Mons, Belgium
| | | | - Fatima Ezahra Annanouch
- Departament
d’Enginyeria Electronica, Universitat
Rovira i Virgili, Països Catalans 26, 43007 Tarragona, Spain
| | - Amin Mohammadpour
- Koç
University Tüpraş Energy Center (KUTEM), Department
of Chemistry, Koç University, 34450 Istanbul, Turkey
| | - Gabriel Malandra
- Physics
Department, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
| | - Arkaprava Das
- Chimie
des Interactions Plasma Surface, Institut Matériaux, Université de Mons, Place du Parc 23, 7000 Mons, Belgium
| | - Aanchal Alagh
- Departament
d’Enginyeria Electronica, Universitat
Rovira i Virgili, Països Catalans 26, 43007 Tarragona, Spain
| | - Imane Arbouch
- Laboratory
for Chemistry of Novel Materials, Université
de Mons, Place du Parc
23, 7000 Mons, Belgium
| | - Loïc Montoisy
- Laboratory
for Chemistry of Novel Materials, Université
de Mons, Place du Parc
23, 7000 Mons, Belgium
| | - David Cornil
- Laboratory
for Chemistry of Novel Materials, Université
de Mons, Place du Parc
23, 7000 Mons, Belgium
| | - Jérôme Cornil
- Laboratory
for Chemistry of Novel Materials, Université
de Mons, Place du Parc
23, 7000 Mons, Belgium
| | - Eduard Llobet
- Departament
d’Enginyeria Electronica, Universitat
Rovira i Virgili, Països Catalans 26, 43007 Tarragona, Spain
| | - Carla Bittencourt
- Chimie
des Interactions Plasma Surface, Institut Matériaux, Université de Mons, Place du Parc 23, 7000 Mons, Belgium
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2
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Rodriguez-Olguin MA, Lipin R, Suominen M, Ruiz-Zepeda F, Castañeda-Morales E, Manzo-Robledo A, Gardeniers JGE, Flox C, Kallio T, Vandichel M, Susarrey-Arce A. Temperature promotes selectivity during electrochemical CO 2 reduction on NiO:SnO 2 nanofibers. JOURNAL OF MATERIALS CHEMISTRY. A 2024:d4ta04116j. [PMID: 39219709 PMCID: PMC11363033 DOI: 10.1039/d4ta04116j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Accepted: 08/08/2024] [Indexed: 09/04/2024]
Abstract
Electrolyzers operate over a range of temperatures; hence, it is crucial to design electrocatalysts that do not compromise the product distribution unless temperature can promote selectivity. This work reports a synthetic approach based on electrospinning to produce NiO:SnO2 nanofibers (NFs) for selectively reducing CO2 to formate above room temperature. The NFs comprise compact but disjoined NiO and SnO2 nanocrystals identified with STEM. The results are attributed to the segregation of NiO and SnO2 confirmed with XRD. The NFs are evaluated for the CO2 reduction reaction (CO2RR) over various temperatures (25, 30, 35, and 40 °C). The highest faradaic efficiencies to formate (FEHCOO- ) are reached by NiO:SnO2 NFs containing 50% of NiO and 50% SnO2 (NiOSnO50NF), and 25% of NiO and 75% SnO2 (NiOSnO75NF), at an electroreduction temperature of 40 °C. At 40 °C, product distribution is assessed with in situ differential electrochemical mass spectrometry (DEMS), recognizing methane and other species, like formate, hydrogen, and carbon monoxide, identified in an electrochemical flow cell. XPS and EELS unveiled the FEHCOO- variations due to a synergistic effect between Ni and Sn. DFT-based calculations reveal the superior thermodynamic stability of Ni-containing SnO2 systems towards CO2RR over the pure oxide systems. Furthermore, computational surface Pourbaix diagrams showed that the presence of Ni as a surface dopant increases the reduction of the SnO2 surface and enables the production of formate. Our results highlight the synergy between NiO and SnO2, which can promote the electroreduction of CO2 at temperatures above room temperature.
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Affiliation(s)
- M A Rodriguez-Olguin
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
| | - R Lipin
- School of Chemical Sciences and Chemical Engineering, Bernal Institute, University of Limerick Limerick V94 T9PX Republic of Ireland
| | - M Suominen
- Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering Kemistintie 1 02015 Espoo Finland
| | - F Ruiz-Zepeda
- Department of Materials Chemistry, National Institute of Chemistry Hajdrihova 19 1000 Ljubljana Slovenia
- Department of Physics and Chemistry of Materials, Institute of Metals and Technology Lepi pot 11 Ljubljana Slovenia
| | - E Castañeda-Morales
- Instituto Politécnico Nacional, Laboratorio de Electroquímica y Corrosión, Escuela Superior de Ingeniería Química e Industrias Extractivas Av. Instituto Politécnico Nacional S/N, Unidad Profesional Adolfo López Mateos CP 07708 CDMX Mexico
| | - A Manzo-Robledo
- Instituto Politécnico Nacional, Laboratorio de Electroquímica y Corrosión, Escuela Superior de Ingeniería Química e Industrias Extractivas Av. Instituto Politécnico Nacional S/N, Unidad Profesional Adolfo López Mateos CP 07708 CDMX Mexico
| | - J G E Gardeniers
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
| | - C Flox
- Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering Kemistintie 1 02015 Espoo Finland
- Department of Electrical Energy Storage, Iberian Centre for Research in Energy Storage, Campus University of Extremadura Avda. de las Letras, s/n 10004 Cáceres Spain
| | - T Kallio
- Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering Kemistintie 1 02015 Espoo Finland
| | - M Vandichel
- School of Chemical Sciences and Chemical Engineering, Bernal Institute, University of Limerick Limerick V94 T9PX Republic of Ireland
| | - A Susarrey-Arce
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
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3
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Che Q, Ghiasi M, Braglia L, Peerlings MLJ, Mauri S, Torelli P, de Jongh P, de Groot FMF. Operando Soft X-ray Absorption of LaMn 1-x Co x O 3 Perovskites for CO Oxidation. ACS Catal 2024; 14:11243-11251. [PMID: 39114095 PMCID: PMC11301621 DOI: 10.1021/acscatal.4c03259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2024] [Revised: 07/09/2024] [Accepted: 07/09/2024] [Indexed: 08/10/2024]
Abstract
We employed operando soft X-ray absorption spectroscopy (XAS) to monitor the changes in the valence states and spin properties of LaMn1-x Co x O3 catalysts subjected to a mixture of CO and O2 at ambient pressure. Guided by simulations based on charge transfer multiplet theory, we quantitatively analyze the Mn and Co 2p XAS as well as the oxygen K-edge XAS spectra during the reaction process. The Mn sites are particularly sensitive to the catalytic reaction, displaying dynamics in their oxidation state. When Co doping is introduced (x ≤ 0.5), Mn oxidizes from Mn2+ to Mn3+ and Mn4+, while Co largely maintains a valence state of Co2+. In the case of LaCoO3, we identify high-spin and low-spin Co3+ species combined with Co2+. Our investigation underscores the importance to consider the spin and valence states of catalyst materials under operando conditions.
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Affiliation(s)
- Qijun Che
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Mahnaz Ghiasi
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Luca Braglia
- AREA
Science Park, Padriciano
99, I-34149 Trieste, Italy
| | - Matt L. J. Peerlings
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Silvia Mauri
- CNR-Istituto
Officina dei Materiali, 34149 Trieste, Italy
| | - Piero Torelli
- CNR-Istituto
Officina dei Materiali, 34149 Trieste, Italy
| | - Petra de Jongh
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Frank M. F. de Groot
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
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4
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da Silva MAR, Tarakina NV, Filho JBG, Cunha CS, Rocha GFSR, Diab GAA, Ando RA, Savateev O, Agirrezabal-Telleria I, Silva IF, Stolfi S, Ghigna P, Fagnoni M, Ravelli D, Torelli P, Braglia L, Teixeira IF. Single-Atoms on Crystalline Carbon Nitrides for Selective C─H Photooxidation: A Bridge to Achieve Homogeneous Pathways in Heterogeneous Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2304152. [PMID: 37986204 DOI: 10.1002/adma.202304152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 09/15/2023] [Indexed: 11/22/2023]
Abstract
Single-atom catalysis is a field of paramount importance in contemporary science due to its exceptional ability to combine the domains of homogeneous and heterogeneous catalysis. Iron and manganese metalloenzymes are known to be effective in C─H oxidation reactions in nature, inspiring scientists to mimic their active sites in artificial catalytic systems. Herein, a simple and versatile cation exchange method is successfully employed to stabilize low-cost iron and manganese single-atoms in poly(heptazine imides) (PHI). The resulting materials are employed as photocatalysts for toluene oxidation, demonstrating remarkable selectivity toward benzaldehyde. The protocol is then extended to the selective oxidation of different substrates, including (substituted) alkylaromatics, benzyl alcohols, and sulfides. Detailed mechanistic investigations revealed that iron- and manganese-containing photocatalysts work through a similar mechanism via the formation of high-valent M═O species. Operando X-ray absorption spectroscopy (XAS) is employed to confirm the formation of high-valent iron- and manganese-oxo species, typically found in metalloenzymes involved in highly selective C─H oxidations.
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Affiliation(s)
- Marcos A R da Silva
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Nadezda V Tarakina
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476, Potsdam, Germany
| | - José B G Filho
- Department of Chemistry, ICEx, Federal University of Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Carla S Cunha
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Guilherme F S R Rocha
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Gabriel A A Diab
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Rômulo Augusto Ando
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000, Brazil
| | - Oleksandr Savateev
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476, Potsdam, Germany
| | - Iker Agirrezabal-Telleria
- Department of Chemical and Environmental Engineering of the Bilbao Engineering School, University of Basque Country (UPV/EHU), Plaza Torres Quevedo 1, Bilbao, 48013, Spain
| | - Ingrid F Silva
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476, Potsdam, Germany
| | - Sara Stolfi
- Department of Chemistry, University of Pavia, viale Taramelli 12, Pavia, 27100, Italy
| | - Paolo Ghigna
- Department of Chemistry, University of Pavia, viale Taramelli 12, Pavia, 27100, Italy
| | - Maurizio Fagnoni
- Department of Chemistry, University of Pavia, viale Taramelli 12, Pavia, 27100, Italy
| | - Davide Ravelli
- Department of Chemistry, University of Pavia, viale Taramelli 12, Pavia, 27100, Italy
| | - Piero Torelli
- TASC Laboratory, CNR-IOM, Istituto Officina dei Materiali, Trieste, 34149, Italy
| | - Luca Braglia
- TASC Laboratory, CNR-IOM, Istituto Officina dei Materiali, Trieste, 34149, Italy
| | - Ivo F Teixeira
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
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5
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Kalam K, Ritslaid P, Käämbre T, Tamm A, Kukli K. Properties of tin oxide films grown by atomic layer deposition from tin tetraiodide and ozone. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2023; 14:1085-1092. [PMID: 38025197 PMCID: PMC10667712 DOI: 10.3762/bjnano.14.89] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 10/19/2023] [Indexed: 12/01/2023]
Abstract
Polycrystalline SnO2 thin films were grown by atomic layer deposition (ALD) on SiO2/Si(100) substrates from SnI4 and O3. Suitable evaporation temperatures for the SnI4 precursor as well as the relationship between growth per cycle and substrate temperature were determined. Crystal growth in the films in the temperature range of 225-600 °C was identified. Spectroscopic analyses revealed low amounts of residual iodine and implied the formation of single-phase oxide in the films grown at temperatures above 300 °C. Appropriateness of the mentioned precursor system to the preparation of SnO2 films was established.
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Affiliation(s)
- Kristjan Kalam
- Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, Estonia
| | - Peeter Ritslaid
- Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, Estonia
| | - Tanel Käämbre
- Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, Estonia
| | - Aile Tamm
- Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, Estonia
| | - Kaupo Kukli
- Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, Estonia
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6
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Mauri S, D'Olimpio G, Ghica C, Braglia L, Kuo CN, Istrate MC, Lue CS, Ottaviano L, Klimczuk T, Boukhvalov DW, Politano A, Torelli P. Hydrogen Production Mechanism in Low-Temperature Methanol Decomposition Catalyzed by Ni 3Sn 4 Intermetallic Compound: A Combined Operando and Density Functional Theory Investigation. J Phys Chem Lett 2023; 14:1334-1342. [PMID: 36727689 DOI: 10.1021/acs.jpclett.2c03471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Hydrogen production from methanol decomposition to syngas (H2 + CO) is a promising alternative route for clean energy transition. One major challenge is related to the quest for stable, cost-effective, and selective catalysts operating below 400 °C. We illustrate an investigation of the surface reactivity of a Ni3Sn4 catalyst working at 250 °C, by combining density functional theory, operando X-ray absorption spectroscopy, and high-resolution transmission electron microscopy. We discovered that the catalytic reaction is driven by surface tin-oxide phases, which protects the underlying Ni atoms from irreversible chemical modifications, increasing the catalyst durability. Moreover, we found that Sn content plays a key role in enhancing the H2 selectivity, with respect to secondary products such as CO2. These findings open new perspectives for the engineering of scalable and low-cost catalysts for hydrogen production.
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Affiliation(s)
- Silvia Mauri
- CNR─Istituto Officina dei Materiali, TASC, I-34149Trieste, Italy
- Department of Physics, University of Trieste, Via Valerio 2, 34127Trieste, Italy
| | - Gianluca D'Olimpio
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100L'Aquila, Italy
| | - Corneliu Ghica
- National Institute of Materials Physics, Atomistilor 405A, 077125Magurele, Romania
| | - Luca Braglia
- CNR─Istituto Officina dei Materiali, TASC, I-34149Trieste, Italy
| | - Chia-Nung Kuo
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan70101, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei10601, Taiwan
| | | | - Chin Shan Lue
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan70101, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei10601, Taiwan
| | - Luca Ottaviano
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100L'Aquila, Italy
| | - Tomasz Klimczuk
- Department of Solid-State Physics, Gdansk University of Technology, 80-233Gdansk, Poland
| | - Danil W Boukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing210037, People's Republic of China
| | - Antonio Politano
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100L'Aquila, Italy
| | - Piero Torelli
- CNR─Istituto Officina dei Materiali, TASC, I-34149Trieste, Italy
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7
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Tavani F, Busato M, Braglia L, Mauri S, Torelli P, D’Angelo P. Caught while Dissolving: Revealing the Interfacial Solvation of the Mg 2+ Ions on the MgO Surface. ACS APPLIED MATERIALS & INTERFACES 2022; 14:38370-38378. [PMID: 35968677 PMCID: PMC9412945 DOI: 10.1021/acsami.2c10005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
Interfaces between water and materials are ubiquitous and are crucial in materials sciences and in biology, where investigating the interaction of water with the surface under ambient conditions is key to shedding light on the main processes occurring at the interface. Magnesium oxide is a popular model system to study the metal oxide-water interface, where, for sufficient water loadings, theoretical models have suggested that reconstructed surfaces involving hydrated Mg2+ metal ions may be energetically favored. In this work, by combining experimental and theoretical surface-selective ambient pressure X-ray absorption spectroscopy with multivariate curve resolution and molecular dynamics, we evidence in real time the occurrence of Mg2+ solvation at the interphase between MgO and solvating media such as water and methanol (MeOH). Further, we show that the Mg2+ surface ions undergo a reversible solvation process, we prove the dissolution/redeposition of the Mg2+ ions belonging to the MgO surface, and we demonstrate the formation of octahedral [Mg(H2O)6]2+ and [Mg(MeOH)6]2+ intermediate solvated species. The unique surface, electronic, and structural sensitivity of the developed technique may be beneficial to access often elusive properties of low-Z metal ion intermediates involved in interfacial processes of chemical and biological interest.
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Affiliation(s)
- Francesco Tavani
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
| | - Matteo Busato
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
| | - Luca Braglia
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Silvia Mauri
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
- Dipartimento
di Fisica, Università di Trieste, Via A. Valerio 2, 34127 Trieste, Italy
| | - Piero Torelli
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Paola D’Angelo
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
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8
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Garcia-Esparza AT, Park S, Abroshan H, Paredes Mellone OA, Vinson J, Abraham B, Kim TR, Nordlund D, Gallo A, Alonso-Mori R, Zheng X, Sokaras D. Local Structure of Sulfur Vacancies on the Basal Plane of Monolayer MoS 2. ACS NANO 2022; 16:6725-6733. [PMID: 35380038 DOI: 10.1021/acsnano.2c01388] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The nature of the S-vacancy is central to controlling the electronic properties of monolayer MoS2. Understanding the geometric and electronic structures of the S-vacancy on the basal plane of monolayer MoS2 remains elusive. Here, operando S K-edge X-ray absorption spectroscopy shows the formation of clustered S-vacancies on the basal plane of monolayer MoS2 under reaction conditions (H2 atmosphere, 100-600 °C). First-principles calculations predict spectral fingerprints consistent with the experimental results. The Mo K-edge extended X-ray absorption fine structure shows the local structure as coordinatively unsaturated Mo with 4.1 ± 0.4 S atoms as nearest neighbors (above 400 °C in an H2 atmosphere). Conversely, the 6-fold Mo-Mo coordination in the crystal remains unchanged. Electrochemistry confirms similar active sites for hydrogen evolution. The identity of the S-vacancy defect on the basal plane of monolayer MoS2 is herein elucidated for applications in optoelectronics and catalysis.
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Affiliation(s)
- Angel T Garcia-Esparza
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States
| | - Sangwook Park
- Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States
| | - Hadi Abroshan
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
| | - Oscar A Paredes Mellone
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - John Vinson
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Baxter Abraham
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Taeho R Kim
- Stanford Nano Shared Facilities, Stanford University, Stanford, California 94305, United States
| | - Dennis Nordlund
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Alessandro Gallo
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Roberto Alonso-Mori
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Xiaolin Zheng
- Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
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9
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Shimizu H, Toyoshima R, Isegawa K, Mase K, Nakamura J, Kondoh H. A newly designed compact CEY-XAFS cell in the soft X-ray region and its application to surface XAFS measurements under ambient-pressure conditions without photoinduced side effects. Phys Chem Chem Phys 2022; 24:2988-2996. [PMID: 35037674 DOI: 10.1039/d1cp04823f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a newly designed compact cell to measure XAFS spectra with the conversion electron yield (CEY) method in the soft X-ray region under ambient-pressure gas conditions. Secondary electrons generated from the gas and sample by collision of X-ray-absorption-induced Auger electrons are collected by a positively biased collector electrode to obtain XAFS spectra. It was confirmed that this cell is applicable to soft X-ray surface XAFS measurements for different types of materials such as insulating organic materials and metal oxides under 1 bar gas conditions. During the measurements, photoinduced side effects were observed; i.e. photoinduced degradation of organic materials and photoinduced reduction/oxidation of metal oxides. We found that these photoinduced side effects can be sufficiently suppressed by controlling the measuring conditions. The presented measuring approach will enable surface XAFS spectra to be obtained in the soft X-ray region for various types of functional materials under ambient-pressure working conditions.
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Affiliation(s)
- Hiroshi Shimizu
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Ryo Toyoshima
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Kazuhisa Isegawa
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Kazuhiko Mase
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.,SOKENDAI (The Graduate University for Advanced Studies), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
| | - Junji Nakamura
- Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Hiroshi Kondoh
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan. .,Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
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10
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Zhang A, Liang Y, Li H, Wang S, Chang Q, Peng K, Geng Z, Zeng J. Electronic Tuning of SnS 2 Nanosheets by Hydrogen Incorporation for Efficient CO 2 Electroreduction. NANO LETTERS 2021; 21:7789-7795. [PMID: 34460262 DOI: 10.1021/acs.nanolett.1c02757] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Surface functionalization with atoms serves as an important strategy to modulate the catalytic activities of low-dimensional nanomaterials. Herein, we developed a facile hydrogen incorporation strategy for improving the catalytic activities of SnS2 nanosheets toward CO2 electroreduction. Compared with SnS2 nanosheets, the hydrogen-incorporated SnS2 (denoted as H-SnS2) nanosheets exhibited high current density and Faradaic efficiency (FE) for formate. At -0.9 V vs RHE, H-SnS2 nanosheets displayed a maximum FE of 93% for carbonaceous product, which rivals the activities of most Sn-based catalysts in CO2 electroreduction. Mechanistic studies disclosed that the incorporation of surface hydrogen induced the electron injection into the structures of H-SnS2 nanosheets, which largely facilitates the process of CO2 activation. Density functional theory (DFT) calculations further revealed that hydrogen incorporation decreased the energy barrier for the formation of HCOO* intermediates, thus contributing to the CO2-to-formate conversion on H-SnS2 nanosheets.
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Affiliation(s)
- An Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Yongxiang Liang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Huiping Li
- Department of Physics, School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Shilong Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Qixuan Chang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Kaiyue Peng
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Zhigang Geng
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Jie Zeng
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
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11
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Piovano A, Signorile M, Braglia L, Torelli P, Martini A, Wada T, Takasao G, Taniike T, Groppo E. Electronic Properties of Ti Sites in Ziegler–Natta Catalysts. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01735] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alessandro Piovano
- Department of Chemistry, INSTM and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
- DPI, P.O.
Box 902, 5600 AX Eindhoven, The Netherlands
| | - Matteo Signorile
- Department of Chemistry, INSTM and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
| | | | | | - Andrea Martini
- Department of Chemistry, INSTM and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russia
| | - Toru Wada
- DPI, P.O.
Box 902, 5600 AX Eindhoven, The Netherlands
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Gentoku Takasao
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Toshiaki Taniike
- DPI, P.O.
Box 902, 5600 AX Eindhoven, The Netherlands
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Elena Groppo
- Department of Chemistry, INSTM and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
- DPI, P.O.
Box 902, 5600 AX Eindhoven, The Netherlands
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12
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Ding W, Liu D, Liu J, Zhang J. Oxygen Defects in Nanostructured
Metal‐Oxide
Gas Sensors: Recent Advances and Challenges
†. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.202000341] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Wenjie Ding
- Beijing Key Laboratory of Construction‐Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science & Engineering, Beijing Institute of Technology Beijing 100081 China
| | - Dandan Liu
- Beijing Key Laboratory of Construction‐Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science & Engineering, Beijing Institute of Technology Beijing 100081 China
| | - Jiajia Liu
- Beijing Key Laboratory of Construction‐Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science & Engineering, Beijing Institute of Technology Beijing 100081 China
| | - Jiatao Zhang
- Beijing Key Laboratory of Construction‐Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science & Engineering, Beijing Institute of Technology Beijing 100081 China
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13
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Spectral Decomposition of X-ray Absorption Spectroscopy Datasets: Methods and Applications. CRYSTALS 2020. [DOI: 10.3390/cryst10080664] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
X-ray absorption spectroscopy (XAS) today represents a widespread and powerful technique, able to monitor complex systems under in situ and operando conditions, while external variables, such us sampling time, sample temperature or even beam position over the analysed sample, are varied. X-ray absorption spectroscopy is an element-selective but bulk-averaging technique. Each measured XAS spectrum can be seen as an average signal arising from all the absorber-containing species/configurations present in the sample under study. The acquired XAS data are thus represented by a spectroscopic mixture composed of superimposed spectral profiles associated to well-defined components, characterised by concentration values evolving in the course of the experiment. The decomposition of an experimental XAS dataset in a set of pure spectral and concentration values is a typical example of an inverse problem and it goes, usually, under the name of multivariate curve resolution (MCR). In the present work, we present an overview on the major techniques developed to realize the MCR decomposition together with a selection of related results, with an emphasis on applications in catalysis. Therein, we will highlight the great potential of these methods which are imposing as an essential tool for quantitative analysis of large XAS datasets as well as the directions for further development in synergy with the continuous instrumental progresses at synchrotron sources.
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14
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Fracchia M, Ghigna P, Minguzzi A, Vertova A, Turco F, Cerrato G, Meroni D. Role of Synthetic Parameters on the Structural and Optical Properties of N,Sn-Copromoted Nanostructured TiO 2: A Combined Ti K-Edge and Sn L 2,3-Edges X-ray Absorption Investigation. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1224. [PMID: 32585978 PMCID: PMC7353116 DOI: 10.3390/nano10061224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/18/2020] [Accepted: 06/19/2020] [Indexed: 11/17/2022]
Abstract
Sn-modification of TiO2 photocatalysts has been recently proposed as a suitable strategy to improve pollutant degradation as well as hydrogen production. In particular, visible light activity could be promoted by doping with Sn2+ species, which are, however, thermally unstable. Co-promotion with N and Sn has been shown to lead to synergistic effects in terms of visible light activity, but the underlying mechanism has, so far, been poorly understood due to the system complexity. Here, the structural, optical, and electronic properties of N,Sn-copromoted, nanostructured TiO2 from sol-gel synthesis were investigated: the Sn/Ti molar content was varied in the 0-20% range and different post-treatments (calcination and low temperature hydrothermal treatment) were adopted in order to promote the sample crystallinity. Depending on the adopted post-treatment, the optical properties present notable differences, which supports a combined role of Sn dopants and N-induced defects in visible light absorption. X-ray absorption spectroscopy at the Ti K-edge and Sn L2,3-edges shed light onto the electronic properties and structure of both Ti and Sn species, evidencing a marked difference at the Sn L2,3-edges between the samples with 20% and 5% Sn/Ti ratio, showing, in the latter case, the presence of tin in a partially reduced state.
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Affiliation(s)
- Martina Fracchia
- Department of Chemistry, Università degli Studi di Pavia, via Taramelli 12, 27100 Pavia, Italy;
| | - Paolo Ghigna
- Department of Chemistry, Università degli Studi di Pavia, via Taramelli 12, 27100 Pavia, Italy;
- Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy; (A.M.); (A.V.)
| | - Alessandro Minguzzi
- Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy; (A.M.); (A.V.)
- Department of Chemistry, Università degli Studi di Milano, via Golgi 19, 20133 Milan, Italy
| | - Alberto Vertova
- Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy; (A.M.); (A.V.)
- Department of Chemistry, Università degli Studi di Milano, via Golgi 19, 20133 Milan, Italy
| | - Francesca Turco
- Department of Chemistry and NIS, Inter-Departmental Center, Università degli Studi di Torino, Via P. Giuria 7, 10125 Torino, Italy; (F.T.); (G.C.)
| | - Giuseppina Cerrato
- Department of Chemistry and NIS, Inter-Departmental Center, Università degli Studi di Torino, Via P. Giuria 7, 10125 Torino, Italy; (F.T.); (G.C.)
| | - Daniela Meroni
- Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy; (A.M.); (A.V.)
- Department of Chemistry, Università degli Studi di Milano, via Golgi 19, 20133 Milan, Italy
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