Photoelectrocatalytic performance of nanostructured p-n junction NtTiO2/NsCuO electrode in the selective conversion of CO2 to methanol at low bias potentials

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorBrito, Juliana Ferreira de-
Autor(es): dc.creatorHudari, Felipe Fantinato-
Autor(es): dc.creatorZanoni, Maria Valnice Boldrin-
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Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionProcesso FAPESP: 2008/10449-7-
Descrição: dc.descriptionProcesso FAPESP: 2013/25343-8-
Descrição: dc.descriptionAiming a selective reduction of CO2 to methanol, a p-n junction semiconductor was constructed based on CuO nanospheres (NsCuO) deposited at TiO2 nanotubes (NtTiO2). The NtTiO2/NsCuO material demonstrated smaller charge transfer resistance, smaller flat band potential and wider optical absorption when compared with NtTiO2 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 NtTiO2/NsCuO was similar to the non-completely nanostructured material Ti/TiO2/CuO (0.1 mmol L−1 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.-
Formato: dc.format81-88-
Idioma: dc.languageen-
Relação: dc.relationJournal of CO2 Utilization-
Relação: dc.relation1,199-
Direitos: dc.rightsopenAccess-
Palavras-chave: dc.subjectCO2 reduction-
Palavras-chave: dc.subjectMethanol formation-
Palavras-chave: dc.subjectNanostructured NtTiO2/NsCuO semiconductor-
Palavras-chave: dc.subjectp-n junction-
Palavras-chave: dc.subjectPhotoelectrocatalysis mechanism-
Título: dc.titlePhotoelectrocatalytic performance of nanostructured p-n junction NtTiO2/NsCuO electrode in the selective conversion of CO2 to methanol at low bias potentials-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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