Journal
CATALYSIS TODAY
Volume 423, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2023.01.013
Keywords
TiO2(B); Cu2NiSnS4; Interface engineering; p-n heterojunction; Nanowires; Photocatalytic hydrogen evolution
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In this study, a Cu2NiSnS4/TiO2(B) heterojunction photocatalyst was prepared and showed significantly improved hydrogen production through optimizing interfacial contact and charge carrier separation.
The photocatalytic hydrogen production is one of the clean and renewable methods of converting solar energy to chemical fuels. Herein, an 0D/1D Cu2NiSnS4/TiO2(B) p-n heterojunction photocatalyst was prepared by a hy-drothermal route. The FE-SEM, and HR-TEM analysis revealed that the 1D nanowire morphology of TiO2(B) was coated uniformly with Cu2NiSnS4 (CNTS) nanoparticles. With an average particle size of 5 nm, CNTS nano-particles improved the interfacial contact and formed an efficient p-n heterojunction with TiO2(B), which greatly improved the charge carrier separation, as evident from the transient photocurrent, photoluminescence, and impedance spectroscopies. The optimized Cu2NiSnS4/TiO2(B) sample produced an average of 7144 & mu;mol/g of hydrogen in 4 h of reaction time under direct sunlight irradiation, which is nearly five times higher than bare TiO2(B). Based on the Mott-Schottky and UV-visDRS spectra, a Z-scheme p-n junction charge transfer mechanism has been proposed.
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