Voltammetric Studies of the Mechanism of the Oxygen Reduction in Alkaline Media at the Spinels Co3O4 and NiCo2O4

被引：20

作者：

Sonmez, Turgut ^{[1
]}

Thompson, Stephen J. ^{[1
]}

Price, Stephen W. T. ^{[2
]}

Pletcher, Derek ^{[1
]}

Russell, Andrea E. ^{[1
]}

机构：

[1] Univ Southampton, Chem, Southampton SO17 1BJ, Hants, England

[2] Diamond Light Source Ltd, Diamond House,Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2016年 / 163卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

HETEROGENEOUS CATALYTIC-REACTIONS; GRAPHITE AIR ELECTRODES; NICKEL-COBALT OXIDES; CARBON; GRAPHENE; COMPOSITES; DIOXYGEN;

D O I：

10.1149/2.0111610jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The mechanism of O-2 reduction at the spinels, Co3O4 and NiCo2O4, in KOH electrolyte is probed using voltammetry at rotating disc and rotating ring-disc electrodes by examination of the rotation rate dependent limiting currents. The analysis shows that the products and mechanisms at the two spinels are quite different. At the cobalt spinel, a substantial amount of the 2e(-) reduction product, H2O2, is formed while at NiCo2O4 the 4e(-) reduction strongly predominates. In terms of both the overpotential for reduction and its limiting current density, the mixed spinel is a substantially better electrocatalyst. It is proposed that the differences arise from an enhanced rate of O-O bond cleavage early in the reduction process at NiCo2O4. (C) The Author(s) 2016. Published by ECS. All rights reserved.

引用

页码：H884 / H890

页数：7

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