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Uncovering the Stabilization Mechanism in Bimetallic Ruthenium−Iridium Anodes for Proton Exchange Membrane Electrolyzers

Saveleva, Viktoriia A. and Wang, Li and Luo, Wen and Zafeiratos, Spyridon and Ulhaq-Bouillet, Corinne and Gago, Aldo and Friedrich, K. Andreas and Savinova, Elena R. (2016) Uncovering the Stabilization Mechanism in Bimetallic Ruthenium−Iridium Anodes for Proton Exchange Membrane Electrolyzers. Journal of Physical Chemistry Letters, 7 (16), pp. 3240-3245. ACS Publications. DOI: DOI: 10.1021/acs.jpclett.6b01500 ISSN 1948-7185

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Official URL: http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.6b01500

Abstract

Proton exchange membrane (PEM) electrolyzers are attracting an increasing attention as a promising technology for the renewable electricity storage. In this work, near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) is applied for in situ monitoring of the surface state of membrane electrode assemblies with RuO2 and bimetallic Ir0.7Ru0.3O2 anodes during water splitting. We demonstrate that Ir protects Ru from the formation of an unstable hydrous Ru(IV) oxide thereby rendering bimetallic Ru−Ir oxide electrodes with higher corrosion resistance. We further show that the water splitting occurs through a surface Ru(VIII) intermediate, and, contrary to common opinion, the presence of Ir does not hinder its formation.

Item URL in elib:https://elib.dlr.de/105931/
Document Type:Article
Title:Uncovering the Stabilization Mechanism in Bimetallic Ruthenium−Iridium Anodes for Proton Exchange Membrane Electrolyzers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Saveleva, Viktoriia A.University of StrasbourgUNSPECIFIED
Wang, Lili.wang (at) dlr.deUNSPECIFIED
Luo, WenUniversity of StrasbourgUNSPECIFIED
Zafeiratos, SpyridonUniversity of StarsbourgUNSPECIFIED
Ulhaq-Bouillet, CorinneUniversity of StarsbourgUNSPECIFIED
Gago, Aldoaldo.gago (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Savinova, Elena R.University StrasbourgUNSPECIFIED
Date:30 July 2016
Journal or Publication Title:Journal of Physical Chemistry Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:7
DOI :DOI: 10.1021/acs.jpclett.6b01500
Page Range:pp. 3240-3245
Editors:
EditorsEmail
Schatz, George C.eic@jpc.acs.org
Publisher:ACS Publications
ISSN:1948-7185
Status:Published
Keywords:IrRu, OER catalyst, stabilization mechanism
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Electrolysis) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Wang, Li
Deposited On:27 Sep 2016 09:43
Last Modified:31 Jul 2019 20:03

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