Superior performance of rGO-tin oxide nanocomposite for selective reduction of CO2 to methanol

Autor(es)

Romeiro, F. C. ^[1] ; Silva, B. C. ^[1] ; Martins, A. S. ^[1] ; Zanoni, M. V. B. ^[1] ; Orlandi, M. O. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Inst Chem, Araraquara 55 Prof Francisco Degni St, BR-14800060 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CO2 UTILIZATION; v. 46, APR 2021.
• Citações Web of Science: 3

Resumo

This study reports on the photoelectrochemical reduction of CO2 to methanol using Sn3O4 and reduced graphene oxide-tin oxide (rGO-Sn) nanocomposite synthesized through the microwave-assisted hydrothermal method. The resulting rGO-Sn nanocomposite exhibited enhanced activity and good stability during photoelectrochemical CO2 reduction explained by Z-scheme electron transport. Graphene oxide (GO) has played a crucial role in the chemical composition and morphology of nanocomposites. The interaction between GO and Sn2+ ions during synthesis promoted the formation of the SnO2 phase in the nanocomposite, thus generating mixed rGO/Sn3O4/ SnO2 phases (the rGO-Sn nanocomposite). Remarkable selectivity for CO2/methanol conversion was obtained for both Sn3O4 and the nanocomposite at different potentials, in which the nanocomposite presented the highest conversion to methanol with a faradaic efficiency of 45 % at -0.3 V vs. Ag/AgCl. The improved activity of the nanocomposite was ascribed to the efficient use of solar energy (UV + visible light), to the decrease in electronic recombination in nanocomposite, which enabled an efficient electron-hole separation on the surface of the nanocomposite, and to the presence of rGO being combined with Sn3O4 and SnO2 structures, which ensured a faster charge transport rate. This study reveals the potential of rGO-Sn nanocomposites as photocathodic material for solar-to-chemical energy conversion. (AU)

• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/18856-5 - Aplicações foto(eletro)químicas visando a produção de combustíveis renováveis utilizando nanocompósitos baseados em óxidos de estanho (SnO e Sn3O4) e compostos de carbono (óxido de grafeno reduzido e nitreto de carbono grafítico)
• Beneficiário: Fernanda da Costa Romeiro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/26219-0 - Estudo de Sensores Químicos de Elemento Único a base de semicondutores de óxidos metálicos
• Beneficiário: Marcelo Ornaghi Orlandi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/13123-4 - Desenvolvimento de membranas fotoeletrocatalíticas baseadas em TiO2 e Al2O3 modificadas e aplicadas no tratamento de contaminantes orgânicos e microrganismos em meio aquoso.
• Beneficiário: Alysson Stefan Martins
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado