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

Amin, Hatem M.A. and Baltruschat, Helmut and Wittmaier, Dennis and Friedrich, K. Andreas (2015) A Highly Efficient Bifunctional Catalyst for Alkaline Air-Electrodes Based on a Ag and Co3O4 Hybrid: RRDE and Online DEMS Insights. Electrochimica Acta, 151, pp. 332-339. Elsevier. ISSN 0013-4686

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Abstract

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.

Item URL in elib:https://elib.dlr.de/92691/
Document Type:Article
Title:A Highly Efficient Bifunctional Catalyst for Alkaline Air-Electrodes Based on a Ag and Co3O4 Hybrid: RRDE and Online DEMS Insights
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Amin, Hatem M.A.hatem (at) pc.uni-bonn.deUNSPECIFIED
Baltruschat, Helmutbaltruschat (at) uni-bonn.deUNSPECIFIED
Wittmaier, Dennisdennis.wittmaier (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Electrochimica Acta
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:151
Page Range:pp. 332-339
Publisher:Elsevier
ISSN:0013-4686
Status:Published
Keywords:bimetallic catalyst cobalt oxide metal-air battery oxygen silver
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Wittmaier, Dennis
Deposited On:08 Dec 2014 11:52
Last Modified:06 Sep 2019 15:16

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