Nanoporous Gold Surface: An Efficient Platform for Hydrogen Evolution Reaction at Very Low Overpotential

Autor(es)

Sukeri, Anandhakumar ^[1] ; Bertotti, Mauro ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05513970 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 29, n. 2, p. 226-231, FEB 2018.
• Citações Web of Science: 4

Resumo

A nanostructured porous gold film (NPGF) was fabricated onto a gold electrode surface by an electrochemical approach involving anodization followed by electrochemical reduction in absence of binary alloys, templates and chemical reducing agents. The electrocatalytic activity of the as-fabricated electrocatalyst was examined towards hydrogen evolution reaction (HER) and very low onset potential (-0.048 V) and overpotential values of -0.070 and -0.083 V at current densities of 10 and 20 mA cm(-2), respectively, were obtained in 0.5 mol L-1 sulfuric acid solution, along with exchange current density (j(o)) of 0.126 mA cm(-2). A small Tafel slope of ca. 36 mV decade(-1) was achieved, indicating the HER takes place according to a Volmer-Heyrovsky mechanism and that the electrochemical desorption of hydrogen is the rate determining step. The performance of the NPGF electrode was compared with that of bulk gold and platinum electrodes, and a platinum-like behavior was noticed for HER. Finally, the durability of the proposed electrocatalyst was examined using voltammetric and amperometric techniques and an excellent stability was achieved. (AU)

• Processo FAPESP: 14/15215-5 - Fabricação e caracterização de nanoeletrodos para uso em microscopia eletroquímica: aplicações analíticas e de caráter fundamental
• Beneficiário: Sukeri Anandhakumar
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/20776-9 - Fabricação de sondas com dimensões nanométricas para o estudo de processos bioquímicos usando Microscopia Eletroquímica
• Beneficiário: Mauro Bertotti
• Modalidade de apoio: Auxílio à Pesquisa - Regular