A facile corrosion approach to the synthesis of highly active CoOx water oxidation catalysts

被引：81

作者：

Indra, Arindam ^{[1
]}

Menezes, Prashanth W. ^{[1
]}

Das, Chittaranjan ^{[2
]}

Goebel, Caren ^{[1
]}

Tallarida, Massimo ^{[2
]}

Schmeisser, Dieter ^{[2
]}

Driess, Matthias ^{[1
]}

机构：

[1] Tech Univ Berlin, Dept Chem Metalorgan & Inorgan Mat, Str 17 Juni 135,Sekr C2, D-10623 Berlin, Germany

[2] Brandenburg Tech Univ Cottbus, Appl Phys & Sensors, Konrad Wachsmann Allee 17, D-03046 Cottbus, Germany

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2017年 / 5卷 / 10期

关键词：

MANGANESE OXIDE CATALYSTS; COBALT-OXIDE; OXYGEN REDUCTION; EVOLUTION; ELECTROCATALYSTS; CO3O4; PERFORMANCE; NANOPARTICLES; STABILITY; MECHANISM;

D O I：

10.1039/c6ta10650a

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：

Ultra-small rock salt cobalt monoxide (CoO) nanoparticles were synthesized and subjected to partial oxidation ('corrosion') with ceric ammonium nitrate (CAN) to form mixed-valence CoOx (1 < x < 2) water oxidation catalysts. Spectroscopic, microscopic and analytical methods evidenced a structural reformation of cubic CoO to active CoOx with a spinel structure. The superior water oxidation activity of CoOx has been established in electrochemical water oxidation under alkaline conditions. Electrochemical water oxidation with CoOx was recorded at a considerably low overpotential of merely 325 mV at a current density of 10 mA cm(-2) in comparison to 370 mV for CoO. Transformation of both octahedral CoII and CoIII sites into amorphous Co(OH)(2)-CoOOH is the key to high electrochemical activity while the presence of a higher amount of octahedral CoIII sites in CoOx is imperative for an efficient oxygen evolution process.

引用

页码：5171 / 5177

页数：7

共 61 条

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