Thermodynamic explanation of the universal correlation between oxygen evolution activity and corrosion of oxide catalysts

被引：373

作者：

Binninger, Tobias ^{[1
]}

Mohamed, Rhiyaad ^{[2
]}

Waltar, Kay ^{[1
]}

Fabbri, Emiliana ^{[1
]}

Levecque, Pieter ^{[2
]}

Koetz, Ruediger ^{[1
]}

Schmidt, Thomas J. ^{[1
,3
]}

机构：

[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[2] Univ Cape Town, HySA Catalysis, ZA-7701 Rondebosch, South Africa

[3] ETH, Phys Chem Lab, CH-8093 Zurich, Switzerland

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

新加坡国家研究基金会; 瑞士国家科学基金会;

关键词：

WATER OXIDATION; COBALT; ELECTROCATALYSTS; ELECTRODES; REDUCTION; STABILITY; MECHANISM; ENERGY; ELECTROLYSIS; PEROVSKITES;

D O I：

10.1038/srep12167

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In recent years, the oxygen evolution reaction (OER) has attracted increased research interest due to its crucial role in electrochemical energy conversion devices for renewable energy applications. The vast majority of OER catalyst materials investigated are metal oxides of various compositions. The experimental results obtained on such materials strongly suggest the existence of a fundamental and universal correlation between the oxygen evolution activity and the corrosion of metal oxides. This corrosion manifests itself in structural changes and/or dissolution of the material. We prove from basic thermodynamic considerations that any metal oxide must become unstable under oxygen evolution conditions irrespective of the pH value. The reason is the thermodynamic instability of the oxygen anion in the metal oxide lattice. Our findings explain many of the experimentally observed corrosion phenomena on different metal oxide OER catalysts.

引用

页数：7

共 35 条

[1] PEM electrolysis for production of hydrogen from renewable energy sources [J].