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Photoactive devices based on heterojunctions of bismuth vanadate and tungsten oxide over graphene

Grant number: 19/26010-9
Support type:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): March 01, 2020
Effective date (End): August 31, 2022
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
Principal researcher:Juliana dos Santos de Souza
Grantee:Bárbara Scola Rodrigues
Home Institution: Centro de Ciências Naturais e Humanas (CCNH). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil


Bismuth vanadate (BiVO4) is considered one of the most promising materials for developing photoanodes for hydrogen production from water, using sunlight as heating source. However, this material exhibits high recombination rates, which limits its applicability. Tungsten doping and heterojunction formation with tungsten oxide (WO3), are the most attractive strategies to improve the photoelectrocatalytic performance of BiVO4. Besides that, aiming to optimize these systems, to obtain devices with the highest efficiency, it is crucial to understand better the electron injection and recombination processes. These processes are deeply related to properties such as crystalline structure, and nature of the chemical species that make up the heterojunction interface. The control of these properties is through the method adopted during its synthesis.In this context, the present proposal aims the preparation of photoanodes based on heterojunctions of tungsten-doped BiVO4 and WO3, synthesized through microwave-assisted routes. The base of the electrode will be a conductor substrate of graphene that will perform the functions of promoting fast electron transport and the ordered growth of WO3 nanostructures. The resultant photoanodes will be characterized through conventional methods and applied for water photosplitting. The transport, injection, and photogenerated charge separation properties will be investigated using electrochemical, spectroelectrochemical, and time-resolved spectroscopies. The chemical composition of the species that form the heterojunction interface will be investigated using nano-imaging techniques. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RODRIGUES, BARBARA SCOLA; BRANCO, CAROLYNE MARTINS; CORIO, PAOLA; SOUZA, JULIANA S. Controlling Bismuth Vanadate Morphology and Crystalline Structure through Optimization of Microwave-Assisted Synthesis Conditions. Crystal Growth & Design, v. 20, n. 6, p. 3673-3685, JUN 3 2020. Web of Science Citations: 0.

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