Uncovering the Stabilization Mechanism in Bimetallic Ruthenium–Iridium Anodes for Proton Exchange Membrane Electrolyzers
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- 作者：Viktoriia A. Saveleva ; Li Wang ; Wen Luo ; Spyridon Zafeiratos ; Corinne Ulhaq-Bouillet ; Aldo S. Gago ; K. Andreas Friedrich ; Elena R. Savinova
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2016
- 出版时间：August 18, 2016
- 年：2016
- 卷：7
- 期：16
- 页码：3240-3245
- 全文大小：445K
- 年卷期：0
- ISSN：1948-7185
文摘
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.