Facile one-pot microwave-assisted synthesis of tungsten-doped BiVO4/WO3 heterojunctions with enhanced photocatalytic activity

Autor(es)

Claudino, Caroline H. ^[1] ; Kuznetsova, Maria ^[1] ; Rodrigues, Barbara S. ^[1] ; Chen, Changqiang ^[2] ; Wang, Zhiyu ^[2] ; Sardela, Mauro ^[2] ; Souza, Juliana S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humans, BR-09210580 Santo Andre, SP - Brazil

^[2] Univ Illinois, Mat Res Lab, 104 S Goodwin Ave, Urbana, IL 61801 - USA

• Tipo de documento: Artigo Científico
• Fonte: Materials Research Bulletin; v. 125, MAY 2020.
• Citações Web of Science: 0

Resumo

Bismuth vanadate (BiVO4) is considered one of the most successful candidates to be used as photoanode for solar-to-hydrogen conversion. However, its relatively high recombination rates and considered low long-term stability limits its applicability. Doping BiVO4 with tungsten and developing heterojunctions with inorganic perovskites has emerged as strategies to overcome these issues. However, the development of these materials requires plenty of time and energy. Here, we reported the development of a new synthetic method to prepare heterojunctions of tungsten-doped bismuth vanadate (using 1, 3 and 5 % in mass of W) and tungsten oxide. The heterojunctions were prepared in a one-pot microwave-assisted method that takes only 24 min. Photocatalytic efficiency was determined through quantification of the amount of hydroxyl radical, generated by the catalysts when they are irradiated with simulated sunlight, and through photoelectrochemical experiments. The heterojunctions showed enhanced photocatalytic activity, which was ascribed to the adequate alignment of the band edges potentials of the semiconductors. Also, the tungsten doping decreases the recombination rates. Both effects increase the photogenerated charges lifetime. (AU)

• Processo FAPESP: 17/11395-7 - Síntese assistida por micro-ondas de heterojunções de óxidos metálicos semicondutores com aplicações fotocatalíticas
• Beneficiário: Juliana dos Santos de Souza Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/26633-0 - Síntese assistida por micro-ondas de nanoestruturas de vanadato de bismuto e óxido de tungstênio com aplicação no desproporcionamento fotoeletroquímico da água
• Beneficiário: Bárbara Scola Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Mestrado