Wet-chemistry synthesis of ultrasmall α-MoC1-x nanoparticles and rGO/ α-MoC1-x composite and its evaluation as electrocatalysts for hydrogen evolution reaction

Autor(es)

Machado, Derik T. ; Moraes, Daniel A. ; Santos, Natalia M. ; Ometto, Felipe B. ; Ticianelli, Edson A. ; Varanda, Laudemir C.

• Tipo de documento: Artigo Científico
• Fonte: Materials Research Bulletin; v. 174, p. 13-pg., 2024-02-20.

Resumo

Ultrasmall molybdenum carbide alpha - MoC1-x nanoparticles (1.6 nm) and the hybrid material rGO/alpha - MoC1-x supported in reduced graphene oxide (rGO) were synthesized by a one -pot oleylamine-mediated route at lowtemperature (613 K). They were evaluated as electrocatalysts for the hydrogen evolution reaction (HER) in the acid medium after surface cleaning with an ethanol -acetic acid solution. The electrocatalysts were also thermal treated (N2 flow, 773 K/30 min) and compared with untreated ones. Quite large HER activity was observed for the alpha - MoC1-x compared with the rGO/alpha - MoC1-x and rGO/alpha - MoC1-x - 773. In addition, after cycling, all catalysts showed considerable performance improvement assigned to removing residual oleylamine molecules from the electrocatalyst's surface. Compared to the unsupported sample, the lower catalytic activity in the supported materials was attributed to the ultrasmall carbide nanoparticles oxidation increases. The route is simple, with low costs and energy consumption, showing a high potential to develop efficient electrocatalysts for HER. (AU)

• Processo FAPESP: 20/06501-5 - Nanopartículas magnéticas com propriedades hipertérmicas intensificadas para tratamento de câncer
• Beneficiário: Laudemir Carlos Varanda
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/01284-2 - Nanopartículas teranósticas a base de óxido de ferro superparamagnético para terapia de câncer da pele via hipertermia magnética
• Beneficiário: Laudemir Carlos Varanda
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/22183-6 - Electrocatálise VI: aspectos fundamentais e aplicados em problemas emergentes e clássicos em conversão eletroquímica de energia
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático