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How Acid Washing Nickel Foam Substrates Improves the Efficiency of the Alkaline Hydrogen Evolution Reaction

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  • Thomas B. Ferriday

    (Department of Engineering Science, University of Agder, NO-4879 Grimstad, Norway
    Group of Energy Materials, Swiss Federal Institute of Technology, Lausanne (EPFL), 1951 Sion, Switzerland)

  • Suhas Nuggehalli Sampathkumar

    (Group of Energy Materials, Swiss Federal Institute of Technology, Lausanne (EPFL), 1951 Sion, Switzerland)

  • Peter Hugh Middleton

    (Department of Engineering Science, University of Agder, NO-4879 Grimstad, Norway)

  • Jan Van Herle

    (Group of Energy Materials, Swiss Federal Institute of Technology, Lausanne (EPFL), 1951 Sion, Switzerland)

  • Mohan Lal Kolhe

    (Department of Engineering Science, University of Agder, NO-4879 Grimstad, Norway)

Abstract

Nickel foam substrates are frequently utilised as porous 3D substrates for renewable energy applications. The preparation of these substrates usually includes an acid-washing step, but the degree to which this step affects the final electrochemical performance after spray-coating a catalyst ink is unreported. Herein, we report the effects of acid washing through physicochemical and electrochemical characterisation. The electrochemical performance was determined through repeated measurements of catalyst-coated nickel foam substrates both with and without the initial step of acid washing. It was found that acid washing increased the current density by 17.9% for the acid-treated MoS 2 -coated nickel foam electrode. This increment was affiliated with an electrochemically active surface area that increased by 11.2%, and a Tafel analysis indicated that the acid-treated MoS 2 -coated electrodes facilitated the initial water dissociation step of the hydrogen evolution reaction with greater ease. Similar effects were also discovered for acid-treated PtIr(1:3)/C-coated nickel foam substrates. The stability was also improved; the degradation rate was reduced by 18.9% for the acid-treated MoS 2 -coated electrodes. This demonstrates the utility of acid washing nickel foam electrodes.

Suggested Citation

  • Thomas B. Ferriday & Suhas Nuggehalli Sampathkumar & Peter Hugh Middleton & Jan Van Herle & Mohan Lal Kolhe, 2023. "How Acid Washing Nickel Foam Substrates Improves the Efficiency of the Alkaline Hydrogen Evolution Reaction," Energies, MDPI, vol. 16(5), pages 1-9, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:5:p:2083-:d:1075098
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    1. Thomas B. Ferriday & Peter Hugh Middleton & Mohan Lal Kolhe, 2021. "Review of the Hydrogen Evolution Reaction—A Basic Approach," Energies, MDPI, vol. 14(24), pages 1-43, December.
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