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Mesostructured Cobalt-Manganese-Oxides as Non-PGM Oxygen Reduction Catalyst in Anion Exchange Membrane Fuel Cells

Lorenz, Julian and Janßen, Holger and Yu, Mingquan and Taffa, Dereje Hailu and Tüysüz, Harun and Wark, Michael and Harms, Corinna and Dyck, Alexander and Wittstock, Gunther (2019) Mesostructured Cobalt-Manganese-Oxides as Non-PGM Oxygen Reduction Catalyst in Anion Exchange Membrane Fuel Cells. Electrolysis and Fuel Cell Discussions, 15.-18. Sep. 2019, La Frande Motte, France.

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Official URL: http://www.efcd2019.eu/index.php

Abstract

In this study, cobalt-manganese oxides with different compositions ranging from cobalt-rich to manganese-rich compounds were investigated for the applicability as cathode catalyst in AEMFC. The materials were synthesized by a nanocasting procedure using KIT-6-100 as hard template resulting in a mesoporous structure. Powder X-ray diffraction showed spinel structure and additional oxide phases for manganese-rich compounds. Their ORR activity was evaluated by RRDE experiments which could be related to the valence state of manganese as studied by X-ray photoelectron spectroscopy. These results showed that the spinel phase is beneficial for the ORR and the highest activities were achieved for compounds with a manganese valence states around +3.5. Moreover, only a minor decrease in activity after potential cycling proved a good electrochemical stability. Finally, the most active cobalt-manganese oxide with a Co/Mn ratio of 2/1 was applied in the cathodes catalyst layer reaching a peak power density of 145 mW/cm2 which is competitive with studies in literature. These results demonstrate the potential use of this material class as non-PGM catalyst in AEMFC.

Item URL in elib:https://elib.dlr.de/129357/
Document Type:Conference or Workshop Item (Poster)
Title:Mesostructured Cobalt-Manganese-Oxides as Non-PGM Oxygen Reduction Catalyst in Anion Exchange Membrane Fuel Cells
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lorenz, Julianjulian.lorenz (at) dlr.dehttps://orcid.org/0000-0002-9936-7667
Janßen, Holgerholger.janssen (at) dlr.dehttps://orcid.org/0000-0003-0787-8724
Yu, Mingquanyu (at) mpi-muelheim.mpg.dehttps://orcid.org/0000-0001-5825-5370
Taffa, Dereje HailuCarl von Ossietzky Universityhttps://orcid.org/0000-0002-1778-8223
Tüysüz, Haruntueysuez (at) mpi-muelheim.mgp.dehttps://orcid.org/0000-0001-8552-7028
Wark, MichaelCarl von Ossietzky Universityhttps://orcid.org/0000-0002-8725-0103
Harms, Corinnacorinna.harms (at) dlr.dehttps://orcid.org/0000-0001-5916-3224
Dyck, Alexanderalexander.dyck (at) dlr.dehttps://orcid.org/0000-0002-5010-8226
Wittstock, Guntherwittstock (at) uol.dehttps://orcid.org/0000-0002-6884-5515
Date:15 September 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Anion exchange membrane fuel cell, Spinel, Cobalt, Manganese, Metal Oxide, Nanocasting
Event Title:Electrolysis and Fuel Cell Discussions
Event Location:La Frande Motte, France
Event Type:international Conference
Event Dates:15.-18. Sep. 2019
HGF - Research field:Energy
HGF - Program:Technology, Innovation and Society
HGF - Program Themes:Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales
DLR - Research area:Energy
DLR - Program:E SY - Energy Systems Analysis
DLR - Research theme (Project):E - Energy Systems Technology (old)
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Fuel Cells
Deposited By: Lorenz, Julian
Deposited On:28 Oct 2019 17:41
Last Modified:25 May 2020 10:23

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