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Nishimoto T, Shinagawa T, Naito T, Harada K, Yoshida M, Takanabe K. High Current Density Oxygen Evolution in Carbonate Buffered Solution Achieved by Active Site Densification and Electrolyte Engineering. CHEMSUSCHEM 2023; 16:e202201808. [PMID: 36341589 PMCID: PMC10100521 DOI: 10.1002/cssc.202201808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/20/2022] [Indexed: 06/16/2023]
Abstract
High current density reaching 1 A cm-2 for efficient oxygen evolution reaction (OER) was demonstrated by interactively optimizing electrolyte and electrode at non-extreme pH levels. Careful electrolyte assessment revealed that the state-of-the-art nickel-iron oxide electrocatalyst in alkaline solution maintained its high OER performance with a small Tafel slope in K-carbonate solution at pH 10.5 at 353 K. The OER performance was improved when Cu or Au was introduced into the FeOx -modified nanostructured Ni electrode as the third element during the preparation of electrode by electrodeposition. The resultant OER achieved 1 A cm-2 at 1.53 V vs. reversible hydrogen electrode (RHE) stably for 90 h, comparable to those in extreme alkaline conditions. Constant Tafel slopes, apparent activation energy, and the same signatures from operando X-ray absorption spectroscopy among these samples suggested that this improvement seems solely correlated with enhanced electrochemical surface area caused by adding the third element.
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Affiliation(s)
- Takeshi Nishimoto
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Tatsuya Shinagawa
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Takahiro Naito
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Kazuki Harada
- Department of Applied ChemistryGraduate School of Sciences and Technology for InnovationYamaguchi University2-16-1 Tokiwadai, UbeYamaguchiJapan
| | - Masaaki Yoshida
- Department of Applied ChemistryGraduate School of Sciences and Technology for InnovationYamaguchi University2-16-1 Tokiwadai, UbeYamaguchiJapan
- Blue Energy Center for SGE Technology (BEST)Yamaguchi University2-16-1 Tokiwadai, UbeYamaguchiJapan
| | - Kazuhiro Takanabe
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
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2
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Klein M, Waldvogel SR. Counter Electrode Reactions-Important Stumbling Blocks on the Way to a Working Electro-organic Synthesis. Angew Chem Int Ed Engl 2022; 61:e202204140. [PMID: 35668714 PMCID: PMC9828107 DOI: 10.1002/anie.202204140] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Indexed: 01/12/2023]
Abstract
Over the past two decades, electro-organic synthesis has gained significant interest, both in technical and academic research as well as in terms of applications. The omission of stoichiometric oxidizers or reducing agents enables a more sustainable route for redox reactions in organic chemistry. Even if it is well-known that every electrochemical oxidation is only viable with an associated reduction reaction and vice versa, the relevance of the counter reaction is often less addressed. In this Review, the importance of the corresponding counter reaction in electro-organic synthesis is highlighted and how it can affect the performance and selectivity of the electrolytic conversion. A selection of common strategies and unique concepts to tackle this issue are surveyed to provide a guide to select appropriate counter reactions for electro-organic synthesis.
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Affiliation(s)
- Martin Klein
- Department of ChemistryJohannes Gutenberg University MainzDuesbergweg 10–1455128MainzGermany
| | - Siegfried R. Waldvogel
- Department of ChemistryJohannes Gutenberg University MainzDuesbergweg 10–1455128MainzGermany
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3
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Wang J, Xin S, Xiao Y, Zhang Z, Li Z, Zhang W, Li C, Bao R, Peng J, Yi J, Chou S. Manipulating the Water Dissociation Electrocatalytic Sites of Bimetallic Nickel-Based Alloys for Highly Efficient Alkaline Hydrogen Evolution. Angew Chem Int Ed Engl 2022; 61:e202202518. [PMID: 35441413 DOI: 10.1002/anie.202202518] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Indexed: 01/13/2023]
Abstract
Transition-metal alloys are currently drawing increasing attention as promising electrocatalysts for the alkaline hydrogen evolution reaction (HER). However, traditional density-functional-theory-derived d-band theory fails to describe the hydrogen adsorption energy (ΔGH ) on hollow sites. Herein, by studying the ΔGH for a series of Ni-M (M=Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Mo, W) bimetallic alloys, an improved d-band center was provided and a potential NiCu electrocatalyst with a near-optimal ΔGH was discovered. Moreover, oxygen atoms were introduced into Ni-M (O-NiM) to balance the adsorption/desorption of hydroxyl species. The tailored electrocatalytic sites for water dissociation can synergistically accelerate the multi-step alkaline HER. The prepared O-NiCu shows the optimum HER activity with a low overpotential of 23 mV at 10 mA cm-2 . This work not only broadens the applicability of d-band theory, but also provides crucial understanding for designing efficient HER electrocatalysts.
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Affiliation(s)
- Jinsong Wang
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, 650093, Kunming, P. R. China
| | - Sisi Xin
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, 650093, Kunming, P. R. China
| | - Yao Xiao
- Institute of Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, 325035, Wenzhou, Zhejiang, P. R. China
| | - Zhengfu Zhang
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, 650093, Kunming, P. R. China
| | - Zhimin Li
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, 650093, Kunming, P. R. China
| | - Wang Zhang
- College of Materials Science and Engineering, Shenzhen University, 518055, Shenzhen, P. R. China
| | - Caiju Li
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, 650093, Kunming, P. R. China
| | - Rui Bao
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, 650093, Kunming, P. R. China
| | - Jian Peng
- Institute for Superconducting & Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, New South Wales, 2500, Australia
| | - Jianhong Yi
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, 650093, Kunming, P. R. China
| | - Shulei Chou
- Institute of Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, 325035, Wenzhou, Zhejiang, P. R. China
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Wang J, Xin S, Xiao Y, Zhang Z, Li Z, Zhang W, Li C, Bao R, Peng J, Yi J, Chou S. Manipulating the Water Dissociation Electrocatalytic Sites of Bimetallic Nickel‐Based Alloys for Highly Efficient Alkaline Hydrogen Evolution. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202202518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Jinsong Wang
- Faculty of Materials Science and Engineering Kunming University of Science and Technology 650093 Kunming P. R. China
| | - Sisi Xin
- Faculty of Materials Science and Engineering Kunming University of Science and Technology 650093 Kunming P. R. China
| | - Yao Xiao
- Institute of Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University 325035 Wenzhou Zhejiang P. R. China
| | - Zhengfu Zhang
- Faculty of Materials Science and Engineering Kunming University of Science and Technology 650093 Kunming P. R. China
| | - Zhimin Li
- Faculty of Materials Science and Engineering Kunming University of Science and Technology 650093 Kunming P. R. China
| | - Wang Zhang
- College of Materials Science and Engineering Shenzhen University 518055 Shenzhen P. R. China
| | - Caiju Li
- Faculty of Materials Science and Engineering Kunming University of Science and Technology 650093 Kunming P. R. China
| | - Rui Bao
- Faculty of Materials Science and Engineering Kunming University of Science and Technology 650093 Kunming P. R. China
| | - Jian Peng
- Institute for Superconducting & Electronic Materials Australian Institute of Innovative Materials University of Wollongong, Innovation Campus Squires Way North Wollongong New South Wales 2500 Australia
| | - Jianhong Yi
- Faculty of Materials Science and Engineering Kunming University of Science and Technology 650093 Kunming P. R. China
| | - Shulei Chou
- Institute of Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University 325035 Wenzhou Zhejiang P. R. China
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Hao J, Luo W, Wang S, Zhao K, Hou J, Li L, Ge B, Yang W, Shi W. Discharge-Induced Enhancement of the Oxygen Evolution Reaction. Angew Chem Int Ed Engl 2021; 60:20042-20048. [PMID: 34254417 DOI: 10.1002/anie.202108770] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Indexed: 11/06/2022]
Abstract
The fundamental understanding of the surface reconstruction induced by the applied potential is of great significance for enhancing the oxygen evolution reaction (OER). Here, we show that a previously overlooked discharge current in the low applied potential region also leads to in situ electrochemical activation of a nitrogen-doped nickel oxyhydroxide surface. We exploit the fact that doping of heteroatoms weakens the surface structure, and hence, a weak discharge current originating from the capacitive nature of nickel oxyhydroxide has a strong structure-reforming ability to promote the formation of nitrogen and oxygen vacancies. The current density at 1.4 V (vs. Hg/HgO) can dramatically increase by as much as 31.3 % after discharge in the low applied potential region. This work provides insight into in situ enhancement of the OER and suggests that the low applied potential region must be a primary consideration in evaluating the origin of the activity of electrocatalysts.
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Affiliation(s)
- Jinhui Hao
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Wei Luo
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Shuaishuai Wang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Kun Zhao
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Jianwen Hou
- Department Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science, Engineering, Southwest Jiaotong University, Chengdu, 610031, P. R. China
| | - Longhua Li
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Baoxin Ge
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Wenshu Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Weidong Shi
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
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Naito T, Shinagawa T, Nishimoto T, Takanabe K. Water Electrolysis in Saturated Phosphate Buffer at Neutral pH. CHEMSUSCHEM 2020; 13:5921-5933. [PMID: 32875653 PMCID: PMC7756658 DOI: 10.1002/cssc.202001886] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 08/31/2020] [Indexed: 05/22/2023]
Abstract
Hydrogen production from renewable energy and ubiquitous water has a potential to achieve sustainability, although current water electrolyzers cannot compete economically with the fossil fuel-based technology. Here, we evaluate water electrolysis at pH 7 that is milder than acidic and alkaline pH counterparts and may overcome this issue. The physicochemical properties of concentrated buffer electrolytes were assessed at various temperatures and molalities for quantitative determination of losses associated with mass-transport during the water electrolysis. Subsequently, in saturated K-phosphate solutions at 80 °C and 100 °C that were found to be optimal to minimize the losses originating from mass-transport at the neutral pH, the water electrolysis performance over model electrodes of IrOx and Pt as an anode and a cathode, respectively, was reasonably comparable with those of the extreme pH. Remarkably, this concentrated buffer solution also achieved enhanced stability, adding another merit of this electrolyte for water electrolysis.
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Affiliation(s)
- Takahiro Naito
- Department of ChemicalSystem Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Tatsuya Shinagawa
- Department of ChemicalSystem Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Takeshi Nishimoto
- Department of ChemicalSystem Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Kazuhiro Takanabe
- Department of ChemicalSystem Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
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8
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Wang Y, Zhao S, Zhu Y, Qiu R, Gengenbach T, Liu Y, Zu L, Mao H, Wang H, Tang J, Zhao D, Selomulya C. Three-Dimensional Hierarchical Porous Nanotubes Derived from Metal-Organic Frameworks for Highly Efficient Overall Water Splitting. iScience 2019; 23:100761. [PMID: 31887660 PMCID: PMC6941879 DOI: 10.1016/j.isci.2019.100761] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 11/04/2019] [Accepted: 12/05/2019] [Indexed: 11/25/2022] Open
Abstract
Effective design of bifunctional catalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is important but remains challenging. Herein, we report a three-dimensional (3D) hierarchical structure composed of homogeneously distributed Ni-Fe-P nanoparticles embedded in N-doped carbons on nickel foams (denoted as Ni-Fe-P@NC/NF) as an excellent bifunctional catalyst. This catalyst was fabricated by an anion exchange method and a low-temperature phosphidation of nanotubular Prussian blue analogue (PBA). The Ni-Fe-P@NC/NF displayed exceptional catalytic activity toward both HER and OER and delivered an ultralow cell voltage of 1.47 V to obtain 10 mA cm−2 with extremely excellent durability for 100 h when assembled as a practical electrolyser. The extraordinary performance of Ni-Fe-P@NC/NF is attributed to the abundance of unsaturated active sites, the well-defined hierarchical porous structure, and the synergistic effect between multiple components. Our work will inspire more rational designs of highly active non-noble electrocatalysts for industrial energy applications. Nanotubular Prussian blue analogue as a precursor is synthesized by anion exchange The catalyst exhibits excellent catalytic activity for hydrogen and oxygen production The catalyst-based electrolyser has a low cell voltage of 1.47 V to obtain 10 mA cm−2 The electrolyser shows an extremely excellent durability for 100 h at 50 mA cm−2
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Affiliation(s)
- Yang Wang
- Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Shenlong Zhao
- The University of Sydney, School of Chemical and Biomolecular Engineering, Sydney, NSW 2006, Australia
| | - Yinlong Zhu
- Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Ruosang Qiu
- Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Thomas Gengenbach
- Manufacturing, Commonwealth Scientific and Industrial Research Organisation, Clayton, VIC 3168, Australia
| | - Yue Liu
- Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Lianhai Zu
- Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Haiyan Mao
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Huanting Wang
- Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Jing Tang
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.
| | - Dongyuan Zhao
- Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia; Department of Chemistry, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, P.R. China.
| | - Cordelia Selomulya
- Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia.
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9
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Qin C, Fan A, Ren D, Luan C, Yang J, Liu Y, Zhang X, Dai X, Wang M. Amorphous NiMS (M: Co, Fe or Mn) holey nanosheets derived from crystal phase transition for enhanced oxygen evolution in water splitting. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134756] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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Dou Y, Zhang L, Xu J, He CT, Xu X, Sun Z, Liao T, Nagy B, Liu P, Dou SX. Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis. ACS NANO 2018; 12:1878-1886. [PMID: 29361233 DOI: 10.1021/acsnano.7b08691] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Graphene-like nanomaterials have received tremendous research interest due to their atomic thickness and fascinating properties. Previous studies mainly focus on the modulation of their electronic structures, which undoubtedly optimizes the electronic properties, but is not the only determinant of performance in practical applications. Herein, we propose a generalized strategy to incrementally manipulate the architectures of several atomically thin transition metal (hydr)oxides, and study their effects on catalytic water oxidation. The results demonstrate the obvious superiority of a wrinkled nanosheet architecture in both catalytic activity and durability. For instance, wrinkled Ni(OH)2 nanosheets display a low overpotential of 358.2 mV at 10 mA cm-2, a high current density of 187.2 mA cm-2 at 500 mV, a small Tafel slope of 54.4 mV dec-1, and excellent long-term durability with gradually optimized performance, significantly outperforming other nanosheet architectures and previously reported catalysts. The outstanding catalytic performance is mainly attributable to the 3D porous network structure constructed by wrinkled nanosheets, which not only provides sufficient contact between electrode materials and current collector, but also offers highly accessible channels for facile electrolyte diffusion and efficient O2 escape. Our study provides a perspective on improving the performance of graphene-like nanomaterials in a wide range of practical applications.
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Affiliation(s)
- Yuhai Dou
- Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong , Wollongong, New South Wales 2500, Australia
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Gold Coast, Queensland 4222, Australia
| | - Lei Zhang
- Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong , Wollongong, New South Wales 2500, Australia
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Gold Coast, Queensland 4222, Australia
| | - Jiantie Xu
- Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong , Wollongong, New South Wales 2500, Australia
| | - Chun-Ting He
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Gold Coast, Queensland 4222, Australia
| | - Xun Xu
- Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong , Wollongong, New South Wales 2500, Australia
| | - Ziqi Sun
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Brisbane, Queensland 4000, Australia
| | - Ting Liao
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Brisbane, Queensland 4000, Australia
| | - Balázs Nagy
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Gold Coast, Queensland 4222, Australia
| | - Porun Liu
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Gold Coast, Queensland 4222, Australia
| | - Shi Xue Dou
- Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong , Wollongong, New South Wales 2500, Australia
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Liu Y, Jin Z, Li P, Tian X, Chen X, Xiao D. Boron- and Iron-Incorporated α-Co(OH)2
Ultrathin Nanosheets as an Efficient Oxygen Evolution Catalyst. ChemElectroChem 2017. [DOI: 10.1002/celc.201701226] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Yunhua Liu
- College of Chemical Engineering; Sichuan University; Chengdu 610064 P.R. China
| | - Zhaoyu Jin
- College of Chemistry; Sichuan University; Chengdu 610064 P.R. China
| | - Panpan Li
- College of Chemistry; Sichuan University; Chengdu 610064 P.R. China
| | - Xianqing Tian
- Evaluation Center of Energetic Materials, Institute of Chemical Materials; China Academy of Engineering Physics; Mianyang 621900 P.R. China
| | - Xiaojuan Chen
- College of Chemical Engineering; Sichuan University; Chengdu 610064 P.R. China
| | - Dan Xiao
- College of Chemical Engineering; Sichuan University; Chengdu 610064 P.R. China
- College of Chemistry; Sichuan University; Chengdu 610064 P.R. China
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12
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Shinagawa T, Ng MTK, Takanabe K. Electrolyte Engineering towards Efficient Water Splitting at Mild pH. CHEMSUSCHEM 2017; 10:4155-4162. [PMID: 28846205 DOI: 10.1002/cssc.201701266] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 08/04/2017] [Indexed: 06/07/2023]
Abstract
The development of processes for the conversion of H2 O and CO2 driven by electricity generated by renewable means is essential to achieving sustainable energy and chemical cycles, in which the electrocatalytic oxygen evolution reaction (OER) is one of the bottlenecks. In this study, the influences of the electrolyte molarity and identity on the OER at alkaline to neutral pH were investigated at an appreciable current density of around 10 mA cm-2 , revealing both the clear boundary of reactant switching between H2 O/OH- , owing to the diffusion limitation of OH- , and the substantial contribution of the mass transport of the buffered species in buffered mild-pH conditions. These findings suggest a strategy of electrolyte engineering: tuning the electrolyte properties to maximize the mass-transport flux. The concept is successfully demonstrated for the OER, as well as overall water electrolysis in buffered mild-pH conditions, shedding light on the development of practical solar fuel production systems.
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Affiliation(s)
- Tatsuya Shinagawa
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center and Physical Sciences and Engineering Division, 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
- Present address: Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladmir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Marcus Tze-Kiat Ng
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center and Physical Sciences and Engineering Division, 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Kazuhiro Takanabe
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center and Physical Sciences and Engineering Division, 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
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Hollmann D, Rockstroh N, Grabow K, Bentrup U, Rabeah J, Polyakov M, Surkus AE, Schuhmann W, Hoch S, Brückner A. From the Precursor to the Active State: Monitoring Metamorphosis of Electrocatalysts During Water Oxidation by In Situ
Spectroscopy. ChemElectroChem 2017. [DOI: 10.1002/celc.201700142] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dirk Hollmann
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT); Albert Einstein-Straße 29A 18059 Rostock Germany
| | - Nils Rockstroh
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT); Albert Einstein-Straße 29A 18059 Rostock Germany
| | - Kathleen Grabow
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT); Albert Einstein-Straße 29A 18059 Rostock Germany
| | - Ursula Bentrup
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT); Albert Einstein-Straße 29A 18059 Rostock Germany
| | - Jabor Rabeah
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT); Albert Einstein-Straße 29A 18059 Rostock Germany
| | - Mykola Polyakov
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT); Albert Einstein-Straße 29A 18059 Rostock Germany
| | - Annette-Enrica Surkus
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT); Albert Einstein-Straße 29A 18059 Rostock Germany
| | - Wolfgang Schuhmann
- Analytical Chemistry and Center for Electrochemical Sciences (CES); Ruhr-University Bochum; Universitätsstraße 150 44780 Bochum Germany
| | - Sascha Hoch
- Evonik Creavis GmbH; Paul-Baumann-Straße 1 45772 Marl Germany
| | - Angelika Brückner
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT); Albert Einstein-Straße 29A 18059 Rostock Germany
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