A Highly Efficient Bifunctional Catalyst for Alkaline Air-Electrodes Based on a Ag and Co3O4 Hybrid: RRDE and Online DEMS Insights

被引：63

作者：

Amin, Hatem M. A. ^{[1
,2
]}

Baltruschat, Helmut ^{[1
]}

Wittmaier, Dennis ^{[3
]}

Friedrich, K. Andreas ^{[3
]}

机构：

[1] Univ Bonn, Inst Phys & Theoret Chem, D-53117 Bonn, Germany

[2] Cairo Univ, Fac Sci, Dept Chem, Giza 12613, Egypt

[3] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Tech Thermodynam, D-70569 Stuttgart, Germany

来源：

ELECTROCHIMICA ACTA | 2015年 / 151卷

关键词：

bimetallic catalyst; cobalt oxide; metal-air battery; oxygen; silver; OXYGEN REDUCTION REACTION; SILVER ELECTRODES; MODIFIED CARBON; LI-AIR; NANOPARTICLES; PEROVSKITE; SURFACES; OXIDE; ELECTROCATALYSIS; BATTERIES;

D O I：

10.1016/j.electacta.2014.11.017

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Enhanced catalytic activity towards oxygen reduction (ORR) and evolution (OER) reactions has been achieved by combination of spinel Co3O4 nanoparticles with Ag particles. Quasi-stationary polarization curves showed that the mixed catalyst, Ag + Co3O4 (10 wt%), outperformed its components. Rotating ringdisc electrode (RRDE) measurements revealed a negligible peroxide species formation and a 4-electron pathway for ORR. A tafel slope of ca. 75 mV dec(-1) has been observed. The overpotential for ORR at 10% Co3O4 catalyst is ca. 70 mV lower than that of Ag and only ca. 80 mV higher than that of the commercial Pt catalyst. DEMS technique provided a direct evidence for oxygen evolution at these bimetallic catalysts. This hybrid is therefore one of the (or even the) most active, carbon-free, durable, non-precious ORR and OER electrocatalysts reported to date. (C) 2014 Published by Elsevier Ltd.

引用

页码：332 / 339

页数：8

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