Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 56, Pages 32012-32021Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.08.258
Keywords
Heterostructure; Bi2S3; TiO2; Photocatalyst; Hydrogen production; Scanning photoelectrochemical microscopy (SPECM)
Categories
Funding
- National Key Research and Development Program of China [2019YFA0705400]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010510]
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Constructing heterosystems by sensitizing a wide band gap semiconductor with a narrow band gap semiconductor is an effective way to improve photocatalytic performance. Bismuth sulfide (Bi2S3) has a direct band gap of 1.38 eV and shows great potential in capturing visible light, which makes it a good candidate for photocatatlytic applications. In this work, Bi2S3 nanoparticles were efficiently deposited on TiO2 nanotube arrays (Bi2S3-TNTAs) by sequential chemical bath deposition (CBD) method to enhance visible light response of the photocatalytic system. Notably, a high-throughput screening method of scanning photoelectrochemical microscopy (SPECM) was exploited to evaluate photoelectrochemical response of the as-prepared composites and to find out the optimized photocatatlytic system. The effects of Bi2S3 nanoparticles on visible light absorption and photoelectrocatalytic hydrogen production rate of the TiO2-system were investigated in detail. When adopted as photoanode, the optimized heteroelectrode exhibited a more than 13-fold enhancement in hydrogen production rate. The result of electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) shows that photo-generated charges excited under visible light in Bi2S3-TNTAs composites are efficiently separated, which gives rise to the superior photoelectrocatalytic performance of the Bi2S3-TNTAs photoanodes. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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