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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Photoelectrocatalytic performance of nanostructured p-n junction NtTiO(2)/NsCuO electrode in the selective conversion of CO2 to methanol at low bias potentials

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Autor(es):
de Brito, Juliana Ferreira [1] ; Hudari, Felipe Fantinato [1] ; Boldrin Zanoni, Maria Valnice [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ, UNESP, Inst Chem, R Francisco Degni 55, BR-14800060 Araraquara, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF CO2 UTILIZATION; v. 24, p. 81-88, MAR 2018.
Citações Web of Science: 9
Resumo

Aiming a selective reduction of CO2 to methanol, a p-n junction semiconductor was constructed based on CuO nanospheres (NsCuO) deposited at TiO2 nanotubes (NtTiO(2)). The NtTiO(2)/NsCuO material demonstrated smaller charge transfer resistance, smaller flat band potential and wider optical absorption when compared with NtTiO(2) and/or Ti/TiO2 nanoparticles coated by higher size particles of CuO (Ti/TiO2/CuO). The selective reduction of dissolved CO2 to methanol was promoted at lower potential of +0.2 V and UV-vis irradiation in 0.1 mol L-1 K2SO4 electrolyte pH 8 with 57% of faradaic efficiency. Even though the performance of the nanostructured material NtTiO(2)/NsCuO was similar to the non-completely nanostructured material Ti/TiO2/CuO (0.1 mmol methanol), the conversion to methanol has been significantly increased when hydroxyls (0.62 mmol L-1) and holes scavengers (0.71 mmol L-1), such as p-nitrosodimethylaniline (RNO) or glucose, respectively, were added in the supporting electrolyte. It indicates that photogenerated electron/hole pairs are spatially separated on p-n junction electrodes, which produces effective electrons and long-life holes, influencing the products formed in the reaction. A schematic representation of the heterojunction effect on the photoelectrocatalytic CO2 reduction is proposed under the semiconductor and each supporting electrolyte, which improves the knowledge about the subject. (AU)

Processo FAPESP: 13/25343-8 - Oxidação simultânea de compostos orgânicos da água residual de petróleo e redução de CO2 dissolvido por fotoeletrocatálise
Beneficiário:Juliana Ferreira de Brito
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 08/10449-7 - Avaliação da ocorrência, toxicidade/genotoxicidade e processos para degradação de corantes em efluentes e águas superficiais
Beneficiário:Maria Valnice Boldrin
Linha de fomento: Auxílio à Pesquisa - Temático