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

被引：73

作者：

Saveleva, Viktoriia A. ^{[1
]}

Wang, Li ^{[2
]}

Luo, Wen ^{[1
]}

Zafeiratos, Spyridon ^{[1
]}

Ulhaq-Bouille, Corinne ^{[3
]}

Gago, Aldo S. ^{[2
]}

Friedrich, K. Andreas ^{[2
]}

Savinova, Elena R. ^{[1
]}

机构：

[1] CNRS UdS, UMR 7515, Inst Chim & Proc Energie Environm, 25 Rue Becquerel, F-67087 Strasbourg, France

[2] German Aerosp Ctr DLR, Inst Engn Thermodynam, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany

[3] Inst Phys & Chim Mat Strasbourg, 23 Rue Loess,BP 43, F-67037 Strasbourg, France

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2016年 / 7卷 / 16期

关键词：

OXYGEN EVOLUTION REACTION; IN-SITU; OXIDE NANOPARTICLES; WATER; ELECTRODES; CORROSION; XPS; RU; ELECTROCATALYSIS; CATALYSTS;

D O I：

10.1021/acs.jpclett.6b01500

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 Ir0.7RuO0.3O2 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.

引用

页码：3240 / 3245

页数：6

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