Ti3C2 MXene Flakes Assisted Mn0.5Cd0.5S/Ti3C2 MXene/g-C3N4 Z-scheme Heterojunction for Enhancing Photocatalytic Hydrogen Evolution
Journal of power sources(2024)
摘要
Efficient carrier separation and high electron migration efficiency are essential for sustainable H2 energy production via photocatalysis. In this work, a Mn0.5Cd0.5S/Ti3C2 MXene/g-C3N4 all-solid-state Z-scheme photocatalyst is constructed by a series of processes, including low temperature calcination, etching, ultrasonication and solvothermal process. The appropriate energy band structures of g-C3N4 and Mn0.5Cd0.5S enable the formation of the Z-scheme system, achieving efficient carrier separation. The Ti3C2 MXene flakes assembled between g-C3N4 nanosheets and Mn0.5Cd0.5S particles can accelerate the charge migration rate in the system. The optimized ternary composite exhibits the highest hydrogen evolution rate (HER) of 13.7 mmol g-1 h-1, which is much higher than that of the pure g-C3N4 and Mn0.5Cd0.5S. Meanwhile, the apparent quantum yield (AQY) value of the composite at 420 nm reaches up to 24.07 % and exhibits high stability. Based on the characterization, the photocatalytic mechanism of carrier transfer in the Z-scheme heterojunction is also revealed. The finding of this article provides insights into the high efficiency of carrier transfer and separation in the photocatalytic reactions.
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关键词
Mn0.5Cd0.5S,g-C3N4,Ti3C2 MXene,Hydrogen evolution,Z-scheme heterojunction
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