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Open AccessFeature PaperCommunication

Probing Transition-Metal Silicides as PGM-Free Catalysts for Hydrogen Oxidation and Evolution in Acidic Medium

1
Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, D-85748 Garching, Germany
2
Johnson Matthey Catalysts (Germany) GmbH, Bahnhofstr. 43, D-96257 Redwitz, Germany
*
Author to whom correspondence should be addressed.
Current Address: BMW Group, D-80788 Munich, Germany.
Materials 2017, 10(6), 661; https://doi.org/10.3390/ma10060661
Received: 3 May 2017 / Revised: 10 June 2017 / Accepted: 13 June 2017 / Published: 16 June 2017
(This article belongs to the Special Issue Advanced Materials in Polymer Electrolyte Fuel Cells)
In this experimental study, we investigate various transition-metal silicides as platinum-group-metal-(PGM)-free electrocatalysts for the hydrogen oxidation reaction (HOR), and for the hydrogen evolution reaction (HER) in acidic environment for the first time. Using cyclic voltammetry in 0.1 M HClO4, we first demonstrate that the tested materials exhibit sufficient stability against dissolution in the relevant potential window. Further, we determine the HOR and HER activities for Mo, W, Ta, Ni and Mo-Ni silicides in rotating disk electrode experiments. In conclusion, for the HOR only Ni2Si shows limited activity, and the HER activity of the investigated silicides is considerably lower compared to other PGM-free HER catalysts reported in the literature. View Full-Text
Keywords: silicides; electro-catalysts; PGM-free; hydrogen electro-oxidation; hydrogen evolution reaction silicides; electro-catalysts; PGM-free; hydrogen electro-oxidation; hydrogen evolution reaction
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MDPI and ACS Style

Mittermeier, T.; Madkikar, P.; Wang, X.; Gasteiger, H.A.; Piana, M. Probing Transition-Metal Silicides as PGM-Free Catalysts for Hydrogen Oxidation and Evolution in Acidic Medium. Materials 2017, 10, 661.

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