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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Bi electrodeposition on WO3 photoanode to improve the photoactivity of the WO3/BiVO4 heterostructure to water splitting

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Author(s):
Coelho, Dyovani [1] ; Gaudencio, Joao Pedro R. S. [1] ; Carminati, Saulo A. [2] ; Ribeiro, Francisco W. P. [3] ; Nogueira, Ana F. [2] ; Mascaro, Lucia H. [1]
Total Authors: 6
Affiliation:
[1] Fed Univ Sao Carlos UFSCar, Nanostruct Mat Lab Mfg Electrochem, Dept Chem, BR-13565905 Sao Carlos - Brazil
[2] Univ Campinas UNICAMP, Lab Nanotecnol & Energia Solar, Chem Inst, BR-13083970 Campinas, SP - Brazil
[3] Fed Univ Cariri, Inst Educ Training, BR-63260000 Brejo Santo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: CHEMICAL ENGINEERING JOURNAL; v. 399, NOV 1 2020.
Web of Science Citations: 6
Abstract

In view of the urgency to replace fossil fuel-based energy sources with sustainable and renewable sources, much has been done to discover new materials and/or production methods that can provide devices capable of converting solar energy into chemical or electrical energy. This work describes the electrodeposition of Bi on WO3 film and its subsequent conversion to BiVO4 with the addition of NH4VO3 and heat treatment. In this way, a WO3/BiVO4 heterojunction is obtained. With this methodology, it is possible to observe the formation of BiVO4 nanostructures with pillar shapes and a photocurrent increase of 300 times compared to films obtained by dropcasting. At 1.23 V vs RHE (Reversible Hydrogen Electrode), the photocurrent achieved with the photoanode reaches 2.1 +/- 0.3 mA cm(-2), which is 35 times higher than pure BiVO4 and 23 times higher than pure WO3. Transient absorption spectroscopy studies show an increase in the time constants for the recombination of charge carriers to the WO3/BiVO4 heterojunction. Electrodeposition is a relatively simple, easy to use, and scalable technique. So, it is expected that its use for the production of photoelectrodes will be more widespread. (AU)

FAPESP's process: 14/06704-2 - SYNTHESIS AND CHARACTERIZATION OF BISMUTH VANADATE FOR WATER SPLITTING AND DEGRADATION OF THE ORGANIC MOLECULES
Grantee:Francisco Wirley Paulino Ribeiro
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
Grantee:Ana Flávia Nogueira
Support Opportunities: Research Grants - Research Centers in Engineering Program
FAPESP's process: 18/16401-8 - Photocatalysts and photoelectrodes for obtaining renewable fuels
Grantee:Lucia Helena Mascaro Sales
Support Opportunities: Regular Research Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC