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Efficient water splitting electrolysis on a platinum-free tungsten carbide electrocatalyst in molten CsH2PO4 at 350–390 °C
Affiliation:1. Department of Chemistry, Inorganic Chemistry, Lichtenbergstrasse 4 and Catalysis Research Center, Ernst-Otto-Fischer-Strasse 1, Technical University of Munich, 85747, Garching, Germany;2. Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej 310, Kgs. Lyngby, DK-2800, Denmark;3. Department of Chemistry, Technical University of Denmark, Kemitorvet 206, Kgs. Lyngby, DK-2800, Denmark;1. National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba West, 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan;2. National Institutes for Quantum and Radiological Science and Technology (QST), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan;1. Institute of Nano Science and Nano Technology, University of Kashan, P.O. Box 87317-51167, Kashan, Islamic Republic of Iran;2. Department of Chemistry, College of Science, University of Raparin, Ranya, Kurdistan Region, Iraq;1. Department of Chemical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India;2. Exxon Mobil India Pvt. Ltd., Whitefield, Bengaluru, Karnataka 560066, India;3. Shell Technology Centre, Bengaluru, Karnataka 562149, India;1. Department of Chemistry, University of Sistan and Baluchestan, P. O. Box 98135-674, Zahedan, Iran;2. Department of Chemistry, Faculty of Sciences University of Guilan, P.O. Box 41335-1914 Rasht, Iran;1. Technical University of Munich, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching b. München, Germany;2. Technical University of Munich, Catalysis Research Center, Ernst-Otto-Fischer-Straße 1, 85748 Garching b. München, Germany;3. Technical University of Munich, Physics Department, James-Franck-Str. 1, 85748 Garching b. München, Germany
Abstract:Tungsten carbide is investigated as cathode in the electrocatalytic water splitting in molten CsH2PO4 in the medium temperature range from 350 to 390 °C. The electrocatalytic activity of tungsten carbide improves with increasing temperature and at 390 °C surpasses that of platinum. Hydrogen is formed during the electrolysis as confirmed by Raman spectroscopy. The tungsten carbide coating of the electrode is stable during electrolysis for at least 63 min at 350 °C and undergoes no apparent change even at 390 °C. The use of molten CsH2PO4 as electrolyte in the medium temperature range allows for the development of abundant and cheap catalysts for the electrochemical water splitting.
Keywords:Medium temperature water electrolysis  Hydrogen evolution reaction (HER)  Tungsten carbide  Non-platinum electrocatalyst
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