DataVXChemistry of MaterialsPaper
journal article·2020-09-22Open access

Improved Hydrogen Oxidation Reaction Activity and Stability of Buried Metal-Oxide Electrocatalyst Interfaces

Florian D. Speck, Farhan S. M. Ali, Michael T. Y. Paul, Ramesh K. Singh, Thomas Böhm, André Hofer, Olga Kasian, Simon Thiele, Julien Bachmann, Dario R. Dekel, Tanja Kallio, Serhiy Cherevko

Chemistry of Materials· Volume 32· Issue 18
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Source abstract

Abstract

High Resolution Image Download MS PowerPoint Slide Various bifunctional metal-oxide composites have recently been proposed as advanced hydrogen oxidation reaction (HOR) electrocatalysts for anion-exchange membrane fuel cells (AEMFCs). It is postulated that metal and oxide are active sites for the adsorption of hydrogen/proton and hydroxide ions, respectively. Of particular interest are the so-called buried interfaces. To investigate processes governing activity and stability at such interfaces, we prepare model Pd and Pt electrocatalysts which are fully covered by thin CeO x films. We investigate how oxide thickness influences HOR activity and dissolution stability of the electrocatalysts. It is found that materials behave very differently and that only Pd exhibits an enhanced HOR activity, while both oxide-protected metals are more stable toward dissolution. A 10-fold decrease in dissolution and 15-fold increase in HOR exchange current density are demonstrated for the optimized Pd/CeO x composites in comparison to pure Pd. We assess the mechanism of the electrocatalytic improvement as well as the role of the protective oxide films in such systems through advanced electrochemical and physical analysis. It is highlighted that a uniform, semipermeable oxide layer with a maximized electrocatalyst–oxide interface is crucial to form HOR catalysts with improved activity and stability.
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Research context

CompositesCatalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, 91058 Erlangen, Germany

Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering, P.O. Box 16100, FI 00076 Aalto, Finland

The Wolfson Department of Chemical Engineering, Technion−Israel Institute of Technology, 3200003 Haifa, Israel

The Nancy & Stephen Grand Technion Energy Program (GTEP), Technion - Israel Institute of Technology, 3200003 Haifa, Israel

Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Chemistry of Thin Film Materials, IZNF, Cauerstr. 3, 91058 Erlangen, Germany

Helmholtz-Zentrum Berlin GmbH, Helmholtz-Institute Erlangen-Nuernberg, 14109 Berlin, Germany

Institute of Chemistry, Saint Petersburg State University, 198504 Saint Petersburg, Russian Federation

Funding

Israel Science Foundation · H2020 Leadership in Enabling and Industrial Technologies · Israel National Research Center for Electrochemical Propulsion · Council for Higher Education

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