Ultrathin Spinel-Structured Nanosheets Rich in Oxygen Deficiencies for Enhanced Electrocatalytic Water Oxidation

被引：1794

作者：

Bao, Jian ^{[1
]}

Zhang, Xiaodong ^{[1
]}

Fan, Bo ^{[1
]}

Zhang, Jiajia ^{[1
]}

Zhou, Min ^{[1
,2
,3
]}

Yang, Wenlong

Hu, Xin ^{[1
]}

Wang, Hui ^{[1
]}

Pan, Bicai ^{[1
]}

Xie, Yi ^{[1
]}

机构：

[1] Univ Sci & Technol China, Microscale Collaborat Innovat Ctr Chem Energy Mat, Hefei Natl Lab Phys Sci, Hefei 230026, Anhui, Peoples R China

[2] Tech Univ Ilmenau, Inst Phys, D-98693 Ilmenau, Germany

[3] Tech Univ Ilmenau, IMN MacroNano ZIK, D-98693 Ilmenau, Germany

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2015年 / 54卷 / 25期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

electrocatalysis; heterogeneous catalysis; oxygen evolution reaction; oxygen vacancies; spinel phases; LAYERED DOUBLE HYDROXIDE; COBALT OXIDE; EVOLUTION; REDUCTION; SURFACE; MECHANISM; ELECTRODE; GRAPHENE; CATALYST; DESIGN;

D O I：

10.1002/anie.201502226

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

Electrochemical water splitting is a clean technology for H-2 fuels, but greatly hindered by the slow kinetics of the oxygen evolution reaction (OER). Herein, a series of spinel-structured nanosheets with oxygen deficiencies and ultrathin thicknesses were designed to increase the reactivity and the number of active sites of the catalysts, which were then taken as an excellent platform for promoting the water oxidation process. Theoretical investigations showed that the oxygen vacancies confined in the ultrathin nanosheet could lower the adsorption energy of H2O, leading to increased OER efficiency. As expected, the NiCo2O4 ultrathin nanosheets rich in oxygen vacancies exhibited a large current density of 285 mAcm(-2) at 0.8V and a small overpotential of 0.32 V, both of which are superior to the corresponding values of bulk samples or samples with few oxygen deficiencies and even higher than those of most reported non-precious-metal catalysts. This work should provide a new pathway for the design of advanced OER catalysts.

引用

页码：7399 / 7404

页数：6

共 34 条

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