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Role of dissolved CO in the solution on the origin of CO pre-oxidation on Pt(1 1 1)-Type electrodes. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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2
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Monteiro MO, Jacobse L, Koper MTM. Understanding the Voltammetry of Bulk CO Electrooxidation in Neutral Media through Combined SECM Measurements. J Phys Chem Lett 2020; 11:9708-9713. [PMID: 33136404 PMCID: PMC7681782 DOI: 10.1021/acs.jpclett.0c02779] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Abstract
Recently, the bulk electrooxidation of CO on gold or platinum has been used to detect CO produced during CO2 reduction in neutral media. The CO bulk oxidation voltammetry may show two distinct peaks depending on the reaction conditions, which up to now have not been understood. We have used scanning electrochemical microscopy (SECM) to probe CO oxidation and pH in the diffusion layer during CO2 reduction. Our results show that the two different peaks are due to diffusion limitation by two different species, namely, CO and OH-. We find that between pH 7 and 11, CO oxidation by water and OH- gives rise to the first and second peak observed in the voltammetry, respectively. Additional rotating disc experiments showed that specifically in this pH range the current of the second peak is diffusion limited by the OH- concentration, since it is lower than the CO concentration.
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Affiliation(s)
- Mariana
C. O. Monteiro
- Leiden
Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Leon Jacobse
- DESY
NanoLab, Deutsches Elektronensynchrotron
DESY, Notkestrasse 85, D-22607 Hamburg, Germany
| | - Marc T. M. Koper
- Leiden
Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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3
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Román AM, Spivey TD, Medlin JW, Holewinski A. Accelerating Electro-oxidation Turnover Rates via Potential-Modulated Stimulation of Electrocatalytic Activity. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c04414] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alex M. Román
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80303, United States
- Renewable and Sustainable Energy Institute, University of Colorado, Boulder, Colorado 80303, United States
| | - Taylor D. Spivey
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80303, United States
- Renewable and Sustainable Energy Institute, University of Colorado, Boulder, Colorado 80303, United States
| | - J. Will Medlin
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80303, United States
- Renewable and Sustainable Energy Institute, University of Colorado, Boulder, Colorado 80303, United States
| | - Adam Holewinski
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80303, United States
- Renewable and Sustainable Energy Institute, University of Colorado, Boulder, Colorado 80303, United States
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4
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Klein J, Chesnyak V, Löw M, Schilling M, Engstfeld AK, Behm RJ. Selective Modification and Probing of the Electrocatalytic Activity of Step Sites. J Am Chem Soc 2019; 142:1278-1286. [PMID: 31875391 DOI: 10.1021/jacs.9b10201] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jens Klein
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - Valeria Chesnyak
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - Mario Löw
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - Martin Schilling
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - Albert K. Engstfeld
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - R. Jürgen Behm
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
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Jusys Z, Behm RJ. The Effect of Anions and pH on the Activity and Selectivity of an Annealed Polycrystalline Au Film Electrode in the Oxygen Reduction Reaction-Revisited. Chemphyschem 2019; 20:3276-3288. [PMID: 31705610 PMCID: PMC6973112 DOI: 10.1002/cphc.201900960] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 10/31/2019] [Indexed: 01/06/2023]
Abstract
Aiming at a better understanding of correlations between the activity and selectivity of Au electrodes in the oxygen reduction reaction (ORR) under controlled transport conditions, we have investigated this reaction by combined electrochemical and in situ FTIR measurements, performed in a flow cell set‐up in an attenuated total reflection (ATR) configuration in acid and alkaline electrolytes. The formation of incomplete reduction products (hydrogen peroxyde/peroxyls) was detected by a collector electrode, the onset of OHad formation was probed by bulk CO oxidation. Using an electroless‐deposited, annealed Au film on a Si prism as working electrode and three different electrolytes for comparison (sulfuric acid, perchloric acid, sodium hydroxide solution), we could derive detailed information on the anion adsorption behavior, and could correlate this with the ORR characteristics. The data reveal pronounced effects of the anions and the pH on the ORR characteristics, indicated e. g., by a grossly different activity and selectivity for the 4‐electron pathway to water/hydroxyls, with the onset ranging from ca. 1.0 V in alkaline electrolyte to 0.6 V in sulfuric acid electrolyte, and the selectivity for the 4‐electron pathway ranging from 100 % (alkaline electrolyte, low overpotentials) to 40 % (acidic electrolytes, alkaline electrolyte at high overpotentials). In contrast, the effect of the ORR on the anion adsorption characteristics is small. Anion effects as well as correlations between anion adsorption and ORR are discussed.
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Affiliation(s)
- Zenonas Jusys
- Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, 89081, Ulm, Germany
| | - R Jürgen Behm
- Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, 89081, Ulm, Germany
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6
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Klein J, Brimaud S, Engstfeld A, Behm R. Atomic scale insights on the electronic and geometric effects in the electro-oxidation of CO on PtxRu1-x/Ru(0001) surface alloys. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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7
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8
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Performance study of a microfluidic reactor for cogeneration of chemicals and electricity. Chem Eng Res Des 2019. [DOI: 10.1016/j.cherd.2018.12.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Galvano– and Potentio–dynamic studies during ethanol electro-oxidation reaction in acid vs. alkaline media: Energy dissipation and blocking nature of potassium. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.09.118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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11
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The potential of zero total charge and electrocatalytic properties of Ru@Pt core-shell nanoparticles. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2018.11.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Bozdech S, Biecher Y, Savinova ER, Schuster R, Krischer K, Bonnefont A. Oscillations in an array of bistable microelectrodes coupled through a globally conserved quantity. CHAOS (WOODBURY, N.Y.) 2018; 28:045113. [PMID: 31906625 DOI: 10.1063/1.5022475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The dynamical behavior of an array of microelectrodes is investigated under controlled current conditions during CO electrooxidation, a bistable electrochemical reaction with an S-shaped negative differential resistance (S-NDR) current-potential curve. Under these conditions, the total current constitutes a globally conserved quantity, thus coupling all microelectrodes globally. Upon increasing the total current, the microelectrodes activate one by one, with a single microelectrode being on its intermediate S-NDR current branch and the other ones being either on their passive or their active branches. When a few coupled microelectrodes are activated, the electrochemical system exhibits spontaneous potential oscillations. Mathematical analysis shows that oscillations arise already in a two group approximation of the dynamics, the two groups consisting of 1 electrode and n - 1 electrodes with n ≥ 3, respectively, with each group being described by a single evolution equation. In this minimal representation, oscillations occur when the single electrode is on the intermediate branch and the larger group is on the active branch.
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Affiliation(s)
- S Bozdech
- Institut de Chimie des Procédés, pour l'Energie, l'Environnement et la Santé, UMR7515, CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Y Biecher
- Institut de Chimie des Procédés, pour l'Energie, l'Environnement et la Santé, UMR7515, CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - E R Savinova
- Institut de Chimie des Procédés, pour l'Energie, l'Environnement et la Santé, UMR7515, CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - R Schuster
- Institut für Physikalische Chemie, Karlsruher Institute of Technology, Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany
| | - K Krischer
- Physik Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - A Bonnefont
- Institut de Chimie de Strasbourg, UMR7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67070 Strasbourg, France
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Olu PY, Ohnishi T, Mochizuki D, Sugimoto W. Uncovering the real active sites of ruthenium oxide for the carbon monoxide electro-oxidation reaction on platinum: The catalyst acts as a co-catalyst. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.12.070] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Lim C, Harrington D, Marshall A. Altering the selectivity of galvanostatic CO2 reduction on Cu cathodes by periodic cyclic voltammetry and potentiostatic steps. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.10.185] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Bozdech S, Krischer K, Crespo-Yapur DA, Savinova E, Bonnefont A. 1/f 2 noise in bistable electrocatalytic reactions on mesoscale electrodes. Faraday Discuss 2016; 193:187-205. [PMID: 27711827 DOI: 10.1039/c6fd00115g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The formation of a self-organized spatial domain during current-controlled CO oxidation, a kinetically bistable reaction, is investigated experimentally and by deterministic simulations as a function of the electrode size and of the supporting electrolyte concentration. Decreasing the microelectrode size leads to the suppression of the spatial instability at the electrode and thus stabilizes the S-NDR branch of the reaction. The critical microelectrode size capable of supporting sustained domain formation is shown to be strongly affected by the sulfuric acid concentration, the characteristic time of the positive feedback loop increasing with the sulfate concentration. Furthermore, we demonstrate that for microelectrode diameters close to the instability threshold, small amplitude electrochemical potential fluctuations appear in the system. These potential fluctuations cannot be captured by deterministic mathematical models and are attributed to a strong enhancement of molecular fluctuations or intrinsic noise in the vicinity of the spatial instability. Analysis of the electrochemical noise revealed a 1/f 2 frequency dependence and several common features with neuronal shot noise.
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Affiliation(s)
- S Bozdech
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé, UMR 7515 of CNRS-Université de Strasbourg-ECPM, 25 rue Becquerel, 67087 Strasbourg, France
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16
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Wouters B, Hereijgers J, De Malsche W, Breugelmans T, Hubin A. Electrochemical characterisation of a microfluidic reactor for cogeneration of chemicals and electricity. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.05.187] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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18
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Dissipative solitons and backfiring in the electrooxidation of CO on Pt. Sci Rep 2015; 5:16312. [PMID: 26553742 PMCID: PMC4639791 DOI: 10.1038/srep16312] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 09/29/2015] [Indexed: 01/08/2023] Open
Abstract
Collisions of excitation pulses in dissipative systems lead usually to their annihilation. In this paper, we report electrochemical experiments exhibiting more complex pulse interaction with collision survival and pulse splitting, phenomena that have rarely been observed experimentally and are only poorly understood theoretically. Using spatially resolved in-situ Fourier transform infrared spectroscopy (FTIR) in the attenuated total reflection configuration, we monitored reaction pulses during the electrochemical oxidation of CO on Pt thin film electrodes in a flow cell. The system forms quasi-1d pulses that align parallel to the flow and propagate perpendicular to it. The pulses split once in a while, generating a second solitary wave in the backward moving direction. Upon collision, the waves penetrate each other in a soliton-like manner. These unusual pulse dynamics could be reproduced with a 3-component reaction-diffusion-migration model with two inhibitor species, one of them exhibiting a long-range spatial coupling. The simulations shed light on existence criteria of such dissipative solitons.
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19
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Rudnev AV, Kuzume A, Fu Y, Wandlowski T. CO Oxidation on Pt(100): New Insights based on Combined Voltammetric, Microscopic and Spectroscopic Experiments. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.04.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Crespo-Yapur DA, Bonnefont A, Schuster R, Krischer K, Savinova ER. Sequential Activation and Oscillations of Globally Coupled Microelectrodes during a Bistable Reaction. ChemElectroChem 2014. [DOI: 10.1002/celc.201402029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Mechanistic aspects of oscillations during CO electrooxidation on Pt in the presence of anions: Experiments and simulations. Catal Today 2013. [DOI: 10.1016/j.cattod.2012.05.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Cooperative Behaviour of Pt Microelectrodes during CO Bulk Electrooxidation. Chemphyschem 2013; 14:1117-21. [DOI: 10.1002/cphc.201300105] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Indexed: 11/07/2022]
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23
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Busó-Rogero C, Herrero E, Bandlow J, Comas-Vives A, Jacob T. CO oxidation on stepped-Pt(111) under electrochemical conditions: insights from theory and experiment. Phys Chem Chem Phys 2013; 15:18671-7. [DOI: 10.1039/c3cp53282h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Ruvinskiy P, Bonnefont A, Savinova E. 3D-ordered layers of vertically aligned carbon nanofilaments as a model approach to study electrocatalysis on nanomaterials. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.03.134] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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26
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Resolution of the mechanism of CO electrooxidation on steady state and evaluation of the kinetic parameters for Pt and Ru electrodes. J Solid State Electrochem 2011. [DOI: 10.1007/s10008-011-1597-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Korzeniewski C, Climent V, Feliu J. Electrochemistry at Platinum Single Crystal Electrodes. ELECTROANALYTICAL CHEMISTRY: A SERIES OF ADVANCES 2011. [DOI: 10.1201/b11480-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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28
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Aldous L, Compton RG. Towards Mixed Fuels: The Electrochemistry of Hydrazine in the Presence of Methanol and Formic Acid. Chemphyschem 2011; 12:1280-7. [DOI: 10.1002/cphc.201100092] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Revised: 03/11/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Leigh Aldous
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ (United Kingdom), Fax: (+44) (0) 1865 275 410
| | - Richard G. Compton
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ (United Kingdom), Fax: (+44) (0) 1865 275 410
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29
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Bauer PR, Bonnefont A, Krischer K. Spatially Resolved ATR-FTIRS Study of the Formation of Macroscopic Domains and Microislands during CO Electrooxidation on Pt. Chemphyschem 2010; 11:3002-10. [PMID: 20715270 DOI: 10.1002/cphc.201000301] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Philipp R Bauer
- Physik-Department E19a, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
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31
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Seidel YE, Jusys Z, Lindström RW, Stenfeldt M, Kasemo B, Krischer K. Oscillatory behaviour in Galvanostatic Formaldehyde Oxidation on Nanostructured Pt/Glassy Carbon Model Electrodes. Chemphyschem 2010; 11:1405-15. [DOI: 10.1002/cphc.200901029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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32
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Ruvinskiy PS, Bonnefont A, Bayati M, Savinova ER. Mass transport effects in CO bulk electrooxidation on Pt nanoparticles supported on vertically aligned carbon nanofilaments. Phys Chem Chem Phys 2010; 12:15207-16. [DOI: 10.1039/c0cp00593b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Bonnefont A, Morschl R, Bauer P, Krischer K. Electrochemical impedance spectroscopy of patterned steady states on electrode surfaces. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.03.054] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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34
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35
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Hanawa H, Kunimatsu K, Uchida H, Watanabe M. In situ ATR-FTIR study of bulk CO oxidation on a polycrystalline Pt electrode. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.05.061] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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36
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Electrocatalytic properties of nanoporous PtRu alloy towards the electrooxidation of formic acid. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2009.01.032] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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37
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Electrocatalysis in oscillatory kinetics of anodic oxidation of formic acid: At Pt; nanogravimetry and voltammetry studies on the role of reactive surface oxide. J Electroanal Chem (Lausanne) 2008. [DOI: 10.1016/j.jelechem.2007.12.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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38
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Bonnefont A, Varela H, Krischer K. Stationary spatial patterns during bulk CO electrooxidation on platinum. J Phys Chem B 2007; 109:3408-15. [PMID: 16851372 DOI: 10.1021/jp045821v] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present experimental studies and mathematical modeling on pattern formation during bulk CO electrooxidation on Pt ring electrodes. Profiles of the interfacial potential drop in front of the working electrode were recorded with a potential probe. Stationary self-organized potential patterns were observed under potentiostatic conditions in dilute acidic and basic supporting electrolytes. The amplitude and shape of these potential patterns can be modified by an appropriate local perturbation of the interfacial potential drop. A mathematical model of the formation of these patterns reveals that the homogeneous state becomes unstable through a subcritical Turing-like bifurcation and that several patterned electrode states coexist in wide parameter ranges.
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Affiliation(s)
- Antoine Bonnefont
- Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
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39
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Angelucci CA, Herrero E, Feliu JM. Bulk CO oxidation on platinum electrodes vicinal to the Pt(111) surface. J Solid State Electrochem 2007. [DOI: 10.1007/s10008-007-0348-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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40
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Angelucci CA, Nart FC, Herrero E, Feliu JM. Anion re-adsorption and displacement at platinum single crystal electrodes in CO-containing solutions. Electrochem commun 2007. [DOI: 10.1016/j.elecom.2007.01.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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41
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42
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Kiss IZ, Kazsu Z, Gaspar V. Experimental Strategy for Characterization of Essential Dynamical Variables in Oscillatory Systems: Effect of Double-Layer Capacitance on the Stability of Electrochemical Oscillators. J Phys Chem A 2005; 109:9521-7. [PMID: 16866403 DOI: 10.1021/jp053656t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An experimentally accessible algorithm for changing the time scale associated with a dynamical variable is proposed. In general, a differential controller can be applied to (a) identify the essential species in oscillatory systems and (b) explore their role in the feedback loops. Here, we report on classifying electrochemical oscillators by changing the time scale over which the electrode potential varies; the type of different electrochemical oscillators is identified based on whether the controlled modification of pseudo-capacitance induces or suppresses current oscillations.
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Affiliation(s)
- Istvan Z Kiss
- Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, Charlottesville, Virginia 22904, USA
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43
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Malkhandi S, Bonnefont A, Krischer K. Strictly potentiostatic current oscillations during bulk CO electro-oxidation on platinum in the presence of inhibiting anions. Electrochem commun 2005. [DOI: 10.1016/j.elecom.2005.04.022] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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44
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Kiss IZ, Brackett AW, Hudson JL. Nonuniform Reaction Rates during CO and CO/H2 Oxidation on Coupled Pt Electrodes. J Phys Chem B 2004. [DOI: 10.1021/jp0494943] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- István Z. Kiss
- Department of Chemical Engineering, 102 Engineers' Way, University of Virginia, Charlottesville, Virginia 22904-4741
| | - Andrew W. Brackett
- Department of Chemical Engineering, 102 Engineers' Way, University of Virginia, Charlottesville, Virginia 22904-4741
| | - John L. Hudson
- Department of Chemical Engineering, 102 Engineers' Way, University of Virginia, Charlottesville, Virginia 22904-4741
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Bonnefont A, Varela H, Krischer K. Stationary Small and Large Amplitude Patterns during Bulk CO Electrooxidation on Platinum. Chemphyschem 2003; 4:1260-3. [PMID: 14653011 DOI: 10.1002/cphc.200300874] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Antoine Bonnefont
- Fritz-Haber-Institut der Max Planck Gesellschaft Faradayweg 4-6, 14195 Berlin, Germany
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Wagner N, Schulze M. Change of electrochemical impedance spectra during CO poisoning of the Pt and Pt–Ru anodes in a membrane fuel cell (PEFC). Electrochim Acta 2003. [DOI: 10.1016/s0013-4686(03)00528-0] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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47
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Electrooxidation of small organic molecules on mesoporous precious metal catalysts. J Electroanal Chem (Lausanne) 2003. [DOI: 10.1016/s0022-0728(03)00046-9] [Citation(s) in RCA: 166] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Waszczuk P, Lu GQ, Wieckowski A, Lu C, Rice C, Masel R. UHV and electrochemical studies of CO and methanol adsorbed at platinum/ruthenium surfaces, and reference to fuel cell catalysis. Electrochim Acta 2002. [DOI: 10.1016/s0013-4686(02)00334-1] [Citation(s) in RCA: 127] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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49
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Destabilizing role of the double layer for a dissolution–depassivation mechanism. J Electroanal Chem (Lausanne) 2002. [DOI: 10.1016/s0022-0728(01)00746-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Plenge F, Rodin P, Schöll E, Krischer K. Breathing current domains in globally coupled electrochemical systems: a comparison with a semiconductor model. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2001; 64:056229. [PMID: 11736076 DOI: 10.1103/physreve.64.056229] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2001] [Indexed: 05/23/2023]
Abstract
Spatio-temporal bifurcations and complex dynamics in globally coupled intrinsically bistable electrochemical systems with an S-shaped current-voltage characteristic under galvanostatic control are studied theoretically on a one-dimensional domain. The results are compared with the dynamics and the bifurcation scenarios occurring in a closely related model which describes pattern formation in semiconductors. Under galvanostatic control both systems are unstable with respect to the formation of stationary large amplitude current domains. The current domains as well as the homogeneous steady state exhibit oscillatory instabilities for slow dynamics of the potential drop across the double layer, or across the semiconductor device, respectively. The interplay of the different instabilities leads to complex spatio-temporal behavior. We find breathing current domains and chaotic spatio-temporal dynamics in the electrochemical system. Comparing these findings with the results obtained earlier for the semiconductor system, we outline bifurcation scenarios leading to complex dynamics in globally coupled bistable systems with subcritical spatial bifurcations.
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Affiliation(s)
- F Plenge
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
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