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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. doi: 10.1016/j.electacta.2014.11.017. 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/ | ||||||||||||||||||||
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| 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: |
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| 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 | ||||||||||||||||||||
| DOI: | 10.1016/j.electacta.2014.11.017 | ||||||||||||||||||||
| 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: | 14 Jun 2023 15:46 |
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