Hydride formation at Ni-containing glassy-metal electrodes during the H2 evolution reaction in alkaline solutions |
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| Institution: | 1. Laboratory for Machine Tools and Production Engineering WZL of RWTH Aachen University, Campus-Boulevard 30, Aachen, Germany;2. FCT Ingenieurkeramik GmbH, Gewerbepark 11, Rauenstein, Germany;1. University of Lille, CNRS, UMR 8576, UGSF, Unité de Glycobiologie Structurale et Fonctionnelle, F 59 000 Lille, France;2. Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche 1195, Université Paris XI, Le Kremlin Bicêtre, France;3. Sorbonne Universités, UPMC Univ Paris06, Ecole Normale Supérieure—PSL Research University, CNRS UMR 7203, Laboratoire des Biomolécules, 4, Place Jussieu, 75252 Paris Cedex 05, France;4. CNRS, INSA—Université Paul Sabatier, LISBP UMR5504, Toulouse, France |
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| Abstract: | A group of Ni-containing glassy metal alloys that are of interest as electrocatalysts for cathodic hydrogen production in water electrolysis have been examined with regard to the role of hydride formation and the participation of sorbed H during cathodic H2 evolution in alkaline solutions. Hydride formation is important as it may determine, in part, the electrocatalytic properties of the alloys at their surfaces, for cathodic H2 evolution. Characteristic time-dependences of currents observed near, but negative to the H2 reversible potential in response to a stepwise change of potential, together with potential-relaxation measurements on open-circuit following current interruption, lead to the conclusion that a three-dimensional hydride is formed in the near-surface region of the metals during the H2 evolution process. Complementary cyclic-voltammetry experiments show that hydrogen deposition-absorption, or H oxidation processes, can be distinguished from possible spontaneous oxidation of the glassy metals, over somewhat overlapping potential regions. |
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