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Electrodeposition of a Ni-Mo alloy Catalyst with Optimized Mo-Content for Hydrogen Evolution Reaction in AEM-Electrolysis

  • Various aqueous citrate electrolyte compositions for the Ni-Mo electrodeposition are explored in order to deposit Ni-Mo alloys with Mo-content ranging from 40 wt% to 65 wt% to find an alloy composition with superior catalytic activity towards the hydrogen evolution reaction (HER). The depositions were performed on copper substrates mounted onto a rotating disc electrode (RDE) and were investigated via scanning electron microscopy (SEM), X-ray fluorescence (XRF) and X-ray diffraction (XRD) methods as well as linear sweep voltammetry (LSV) and impedance spectroscopy. Kinetic parameters were calculated via Tafel analysis. Partial deposition current densities and current efficiencies were determined by correlating XRF measurements with gravimetric results. The variation of the electrolyte composition and deposition parameters enabled the deposition of alloys with Mo-content over the range of 40-65 wt%. An increase in Mo-content in deposited alloys was recorded with an increase in rotation speed of the RDE. Current efficiency of the deposition was in the magnitude of <1%, which is characteristic for the deposition of alloys with high Mo-content. The calculated kinetic parameters were used to determine the Mo-content with the highest catalytic activity for use in the HER.

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Author:Leonard Böhm, Klaus Thielker, Norbert Kazamer, Florian Josef Wirkert, Gabriela Marginean, Ulrich Rost, Ulf-Peter Apfel, Michael Brodmann
Parent Title (English):WHEC-2022, 23rd World Hydrogen Energy Conference
Document Type:Conference Proceeding
Language:English
Date of Publication (online):2022/06/26
Date of first Publication:2022/06/26
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2024/09/02
Tag:AEM-Electrolysis; Electrodeposition; Ni-Mo alloy Catalyst
Departments / faculties:Institute / Westfälisches Energieinstitut
Licence (German):License LogoEs gilt das Urheberrechtsgesetz

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