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  Limiting Current Density of Oxygen Reduction under Ultrathin Electrolyte Layers: From the Micrometer Range to Monolayers

Zhong, X., Schulz, M., Wu, C.-H., Rabe, M., Erbe, A., & Rohwerder, M. (2021). Limiting Current Density of Oxygen Reduction under Ultrathin Electrolyte Layers: From the Micrometer Range to Monolayers. ChemElectroChem, 8(4), 712-718. doi:10.1002/celc.202100083.

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The Authors. ChemElectroChem published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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 Creators:
Zhong, Xiankang1, Author              
Schulz, Matthias2, Author              
Wu, Chun-Hung2, Author              
Rabe, Martin3, Author              
Erbe, Andreas4, Author              
Rohwerder, Michael2, Author              
Affiliations:
1State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu, China, ou_persistent22              
2Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              
3Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863358              
4Department of Materials Science and Engineering, NTNU - Norwegian University of Science and Technology, 7491 Trondheim, Norway, ou_persistent22              

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Free keywords: Atmospheric corrosion; Current density; Electrolytic reduction; Energy conversion; Fuel cells; Hydrogen; Micrometers; Monolayers; Oxygen; Oxygen reduction reaction; Thickness measurement, Dynamic equilibria; ELectrochemical methods; Electrolyte layers; Hydrogen oxidation; Hydrogen permeation; Limiting current density; Micrometer ranges; Ultrathin electrolytes, Electrolytes
 Abstract: The oxygen reduction reaction (ORR) under ultrathin electrolyte layers is a key reaction in many processes, from atmospheric corrosion to energy conversion in fuel cells. However, the ORR current under ultrathin electrolyte layers is difficult to measure using conventional electrochemical methods. Hence, reliable data are scarce for the micrometer range and totally missing for the sub-micrometer range of the electrolyte layer thickness. Here, we report a novel hydrogen-permeation-based approach to measure the ORR current underneath thin and ultrathin electrolyte layers. By using a Kelvin-probe-based measurement of the potential, which results from dynamic equilibrium of oxygen reduction and hydrogen oxidation, and the corresponding hydrogen charging current density, the full current-potential relationship can be constructed. The results shed a new light on the nature of the limiting current density of ORR underneath ultrathin layers of electrolyte. © 2021 The Authors. ChemElectroChem published by Wiley-VCH GmbH

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Language(s): eng - English
 Dates: 2021-02-12
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/celc.202100083
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Title: ChemElectroChem
  Abbreviation : ChemElectroChem
Source Genre: Journal
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Publ. Info: Weinheim, Germany : WILEY-VCH Verlag GmbH & Co. KGaA
Pages: - Volume / Issue: 8 (4) Sequence Number: - Start / End Page: 712 - 718 Identifier: ISSN: 2196-0216
CoNE: https://pure.mpg.de/cone/journals/resource/2196-0216