Electrodeposited Tin-Antimony Alloys as Novel Electrocatalysts for Selective and Stable Carbon Dioxide Reduction to Formate

Autor(es)

Lucas, Francisco W. S. ; Lima, Fabio H. B.

• Tipo de documento: Artigo Científico
• Fonte: CHEMELECTROCHEM; v. 7, n. 18, p. 10-pg., 2020-08-13.

Resumo

The activity of SnSb alloy films as electrocatalysts for the CO(2)reduction reaction (CO2RR) to formate was presented for the first time. The effects of the film composition, electrochemical potential, and nature and concentration of the supporting electrolyte on the activity and long-term stability of these catalysts were evaluated. Sn(9)Sb(1)alloy exhibited improved long-term stability when compared to pure Sn films, and this was attributed to the lower insertion of alkali and lower formation of hydride species, inhibiting the electrode disintegration. Additionally, the Sn(9)Sb(1)film exhibited the highest faradaic efficiency (F.E.) among all prepared films, including pure Sn, reaching 96.2 % at -1.25 V vs. RHE. This was ascribed to the better balance between the number of Sn atoms (active species) exposed on the surface and the induced morphologic effect brought by the presence of Sb, generating cube-shaped crystallites. These structures have a high number of undercoordinated surface atoms (located on the steps, corners, and kinks) and grain boundaries, resulting in more "reactive" Sn atoms, which serve as CO(2)activation sites, increasing the overall activity and F.E. for formate production. (AU)

• 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
• Processo FAPESP: 16/13323-0 - Eletroquímica do Dióxido de Carbono e da Água: Aplicação em Estocagem e Aproveitamento de Energia
• Beneficiário: Fabio Henrique Barros de Lima
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/03156-5 - Uma abordagem high-throughput combinatorial no estudo de ligas metálicas e seus respectivos calcogenetos para aplicação na reação de redução foto-/eletroquímica do CO2
• Beneficiário: Francisco Willian de Souza Lucas
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático