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Orientador(es)
Resumo(s)
Three-dimensional (3D) nickel-copper (Ni-Cu) nanostructured foams were prepared by galvanostatic electrodeposition, on stainless steel substrates, using the dynamic hydrogen bubble template. These foams were tested as electrodes for the hydrogen evolution reaction (HER) in 8 M KOH solutions. Polarisation curves were obtained for the Ni-Cu foams and for a solid Ni electrode, in the 25-85 degrees C temperature range, and the main kinetic parameters were determined. It was observed that the 3D foams have higher catalytic activity than pure Ni. HER activation energies for the Ni-Cu foams were lower (34-36 kJ mol(-1)) than those calculated for the Ni electrode (62 kJ mol(-1)). The foams also presented high stability for HER, which makes them potentially attractive cathode materials for application in industrial alkaline electrolysers.
Descrição
Palavras-chave
Alkaline water electrolysis Electrochemical deposition Nickel electrode Alloys Kinetics Coatings Cathode Media
Contexto Educativo
Citação
CARDOSO, D. S. P.; [et al.] - Hydrogen evolution on nanostructured Ni-Cu foams. RSC Advances. ISSN. 2046-2069. Vol. 5, N.º 54 (2015), pp. 43456-43461.
Editora
ROYAL SOC CHEMISTRY