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.
![]() |
PDF
- Only accessible within DLR
2MB |
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: |
| |||||||||||||||
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 |
Repository Staff Only: item control page