| Texto completo | |
| Autor(es): |
de Brito, Juliana Ferreira
;
Hudari, Felipe Fantinato
;
Boldrin Zanoni, Maria Valnice
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF CO2 UTILIZATION; v. 24, p. 8-pg., 2018-03-01. |
| 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: | 08/10449-7 - Avaliação da ocorrência, toxicidade/genotoxicidade e processos para degradação de corantes em efluentes e águas superficiais |
| Beneficiário: | Maria Valnice Boldrin |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| 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 |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |