OXYGEN REDUCTION ON COPPER CHROMIUM MANGANITES - EFFECT OF OXIDE COMPOSITION ON THE REACTION-MECHANISM IN ALKALINE-SOLUTION

被引：15

作者：

ORTIZ, J ^{[1
]}

GAUTIER, JL ^{[1
]}

机构：

[1] UNIV SANTIAGO,FAC QUIM & BIOL,DEPT QUIM APLICADA,ELECTROQUIM LAB,SANTIAGO 2,CHILE

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1995年 / 391卷 / 1-2期

关键词：

OXYGEN REDUCTION; COPPER CHROMIUM MANGANITES; PEROXIDE; SPINEL; ELECTROCATALYSIS;

D O I：

10.1016/0022-0728(95)03964-I

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The electrocatalytic oxygen reduction reaction (ORR) in 1 M KOH at 25 degrees C on Teflon-bonded Cr-(1-x)CuxMn2O4 + graphite electrodes with x = 0, 0.5, 0.75, 0.9 and 1 has been studied using the rotating-ring-disk technique. All manganites exhibited spinel structure with tetragonal distortion. The reaction rate depends on the [Mn4+]/[Cu2+ + Cr3+ + Mn3+] surface ratio. The ORR occurs through ''interactive'' and ''parallel'' pathways depending on the oxide composition parameter x. The most active oxide Cr0.25Cu0.75Mn2O4 shows the lowest OCP and the highest kinetic S-1 parameter.

引用

页码：111 / 118

页数：8

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