Mechanism of the hydrazine hydrate electrooxidation reaction on Ni electrodes in alkaline media as revealed by isotopic (H/D) substitution, DFT, and kinetic modelling
Abstract
OHad is an intermediate of the initial step of hydrazine oxidation on Ni • Co-adsorbed OHad lowers the activation barrier for N-H bond cleavage • The inability of Ni to catalyse the reaction in the absence of OHad accounts for the high 'onset' potential • Had is not an HHOR intermediate but its desorption kinetically limits the reaction Abstract The hydrazine hydrate oxidation reaction (HHOR) has attracted increasing attention owing to hydrazine's promise as a fuel, particularly for direct hydrazine hydrate fuel cells (DHHFCs); nevertheless, most studies have focused on noble metal catalysts, while the underlying reaction mechanism on Ni-based catalysts remains to be fully elucidated. In this work, the HHOR mechanism on Ni surfaces was studied by combining density functional theory (DFT) calculations, online differential electrochemical mass-spectrometry (DEMS), electrochemical measurements with isotopic
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BibTeX
@article{vorms2026mechanism,
title = {{Mechanism of the hydrazine hydrate electrooxidation reaction on Ni electrodes in alkaline media as revealed by isotopic (H/D) substitution, DFT, and kinetic modelling}},
author = {Evgeniia Vorms and Evgenii Strugovshchikov and Mykola Isaiev and Yimin Zhang and Antoine Bonnefont and Marian Chatenet and Elena Savinova and Alexandr Oshchepkov},
journal = {Electrochimica Acta},
year = {2026},
month = sep,
doi = {10.1016/j.electacta.2026.148995},
url = {https://univ-grenoble-alpes.hal.science/hal-05766663v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Mechanism of the hydrazine hydrate electrooxidation reaction on Ni electrodes in alkaline media as revealed by isotopic (H/D) substitution, DFT, and kinetic modelling
AU - Evgeniia Vorms
AU - Evgenii Strugovshchikov
AU - Mykola Isaiev
AU - Yimin Zhang
AU - Antoine Bonnefont
AU - Marian Chatenet
AU - Elena Savinova
AU - Alexandr Oshchepkov
PY - 2026
DA - 2026/09/28
JO - Electrochimica Acta
DO - 10.1016/j.electacta.2026.148995
UR - https://univ-grenoble-alpes.hal.science/hal-05766663v1
AB - OHad is an intermediate of the initial step of hydrazine oxidation on Ni • Co-adsorbed OHad lowers the activation barrier for N-H bond cleavage • The inability of Ni to catalyse the reaction in the absence of OHad accounts for the high 'onset' potential • Had is not an HHOR intermediate but its desorption kinetically limits the reaction Abstract The hydrazine hydrate oxidation reaction (HHOR) has attracted increasing attention owing to hydrazine's promise as a fuel, particularly for direct hydrazine hydrate fuel cells (DHHFCs); nevertheless, most studies have focused on noble metal catalysts, while the underlying reaction mechanism on Ni-based catalysts remains to be fully elucidated. In this work, the HHOR mechanism on Ni surfaces was studied by combining density functional theory (DFT) calculations, online differential electrochemical mass-spectrometry (DEMS), electrochemical measurements with isotopic
SN - 0013-4686
ER -