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Investigation of the hydrogen electrode reactions on Ni electrocatalysts in alkaline medium

Abstract : The present thesis is mainly focused on the influence of the surface state of Ni electrodes on the kinetics and the mechanism of the hydrogen oxidation/evolution reactions (HOR/HER) in alkaline medium. By combining the results of electrochemical measurements with microkinetic modeling, it was shown that specific activity of Ni in the HOR/HER increases up to 10 times if along with metallic Ni, Ni oxide species are present on the electrode surface. In addition, the effect of the addition of a second metal to Ni electrocatalysts on their activity in the HOR/HER was investigated for NiMo/C and NiCu/C systems. In both cases an enhancement of specific activity was observed in comparison with the reference Ni/C sample, which was assigned to a decrease of the adsorption energy of the hydrogen intermediate on Ni participating in the HOR/HER.
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Submitted on : Friday, February 1, 2019 - 11:42:37 AM
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Alexandr Oshchepkov. Investigation of the hydrogen electrode reactions on Ni electrocatalysts in alkaline medium. Theoretical and/or physical chemistry. Université de Strasbourg; Boreskov Institute of Catalysis, 2017. English. ⟨NNT : 2017STRAF071⟩. ⟨tel-02003369⟩

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