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Oxygen Reduction Reaction Activity of Mesostructured Cobalt-Based Metal Oxides Studied with the Cavity-Microelectrode Technique

Behnken, Julian and Yu, Mingquan and Deng, Xiaohui and Tüysüz, Harun and Harms, Corinna and Dyck, Alexander and Wittstock, Gunther (2019) Oxygen Reduction Reaction Activity of Mesostructured Cobalt-Based Metal Oxides Studied with the Cavity-Microelectrode Technique. ChemElectroChem, 6 (13), pp. 3460-3467. Wiley. DOI: 10.1002/celc.201900722 ISSN 2196-0216

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Official URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/celc.201900722

Abstract

Abstract Cobalt oxides are known as abundant and stable catalysts for the oxygen reduction reaction (ORR) in an alkaline environment. Here, the ORR activity of Co3O4 and mixed metal oxides NiCo2O4 and CuCo2O4 was studied. Synthesis by using the nanocasting procedure resulted in a mesostructured spinel phase with uniform morphology and high surface area. However, the evaluation of the specific activity of this material class is often hampered by limitations in determining the real surface area. The cavity-microelectrode technique did not require the addition of any additives to the catalytic material. Thus, measuring the double layer capacitance was used to assess the surface area. This approach showed comparable and reliable values for all samples and different cavity depths. Furthermore, the in situ derived surface area enabled the determination of the specific ORR activity, which is more accurate than utilizing the geometric and nitrogen absorption derived surface area. Although the activity of Co3O4 was rather low, the presence of Ni2+ and Cu2+ in the mixed metal oxides led to a substantial activity enhancement, possibly by providing additional active sites.

Item URL in elib:https://elib.dlr.de/128463/
Document Type:Article
Title:Oxygen Reduction Reaction Activity of Mesostructured Cobalt-Based Metal Oxides Studied with the Cavity-Microelectrode Technique
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Behnken, Julianjulian.behnken (at) dlr.dehttps://orcid.org/0000-0002-9936-7667
Yu, Mingquanyu (at) mpi-muelheim.mpg.deUNSPECIFIED
Deng, Xiaohuixiaodeng (at) mpi-muelheim.mpg.deUNSPECIFIED
Tüysüz, Haruntueysuez (at) mpi-muelheim.mgp.deUNSPECIFIED
Harms, Corinnacorinna.harms (at) dlr.deUNSPECIFIED
Dyck, Alexanderalexander.dyck (at) dlr.deUNSPECIFIED
Wittstock, Guntherwittstock (at) uol.dehttps://orcid.org/0000-0002-6884-5515
Date:23 June 2019
Journal or Publication Title:ChemElectroChem
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:6
DOI :10.1002/celc.201900722
Page Range:pp. 3460-3467
Publisher:Wiley
ISSN:2196-0216
Status:Published
Keywords:fuel cells, mesoporous materials, non-platinum group metal (non-PGM), powder microelectrode, spinel phase
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems
Deposited By: Behnken, Julian
Deposited On:05 Aug 2019 17:38
Last Modified:05 Aug 2019 17:38

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