NiMo electrocatalysts from a deep eutectic solvent for the hydrogen evolution reaction

Autor(es):Mostrar menos -

Sousa, Natalia G. ; Bezerra, Lucas L. ; Gomes, Kauan L. ; Feitosa, Filipe X. ; Sant'Ana, Hosiberto B. de ; Mascaro, Lucia H. ; Schwarzacher, Walther ; de Lima-Neto, Pedro ; Monteiro, Norberto K. V. ; Casciano, Paulo N. S. ; Correia, Adriana N.

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 142, p. 9-pg., 2025-06-27.

Resumo

Here we report the influence of temperature on the electrodeposition of NiMo in a mixture of choline chloride (ChCl) and ethylene glycol (EG) with molar ratio 1:2 (ethaline) on Cu substrate and its consequences for the hydrogen evolution reaction (HER). Potentiostatic deposition of Ni and NiMo at 298 K resulted in thin films; at 343 K, the morphology was cauliflower-like for Ni and NiMo, with 4 % Mo content. The electrocatalytic performance of the water-splitting coatings was evaluated by linear sweep voltammetry (LSV) in 1 M KOH. The electrocatalytic tests allowed us to establish the performance sequence of the deposits: Ni94Mo6>Ni98Mo2>Ni-343K > Ni-298K. Electrochemical impedance spectroscopy (EIS) results showed that the NiMo coatings had significantly lower charge transfer resistance (R-CT) values than the Ni-only coatings despite containing only a small percentage of Mo. Computational simulations indicated that the Ni96Mo4 surface has the highest catalytic performance due to the near-zero Gibbs energy of water adsorption relative to Ni-100. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia