Effect of FeOx on the electrocatalytic properties of NiCo2O4 for O2 evolution from alkaline solutions

被引：26

作者：

Guerrini, E. ^{[1
]}

Piozzini, M. ^{[1
]}

Castelli, A. ^{[1
]}

Colombo, A. ^{[1
]}

Trasatti, S. ^{[1
]}

机构：

[1] Univ Milan, Dept Phys Chem & Electrochem, I-20133 Milan, Italy

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2008年 / 12卷 / 04期

关键词：

electrocatalysis; O-2; evolution; oxide electrodes; NiCo2O4; Fe oxide;

D O I：

10.1007/s10008-007-0406-1

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Mixtures of NiCo2O4 and FeOx were obtained by thermal decomposition of the nitrates of Ni, Co, and Fe in appropriate proportions. Two series of electrodes were prepared: (1) at constant composition (20 mol% FeOx ) and various calcination temperatures in the range 200 to 480 degrees C and (2) at constant calcination temperature (300 degrees C) and various compositions in the whole composition range 0 to 100 mol% FeOx . The oxide layers were characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, and cyclic voltammetry. Experimental data showed that the layers consist of a mixture of phases in which Fe oxide is present as Fe2O3. The electrocatalytic properties were assessed by means of quasi-stationary potentiostatic current-potential curves for the O-2 evolution reaction from alkaline solution. Results have shown that the mechanism of O-2 evolution depends on composition moderately. The electrocatalytic activity appears to depend on composition only slightly.

引用

页码：363 / 373

页数：11

共 27 条

[1] Optimized photovoltiac system for hydrogen production [J].