【摘 要】
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Low-efficiency charge transfer is a critical factor to limit the photocatalytic H2 evolution activity of semiconductor photocatalysts.The interface design is a promising approach to achieve high charge-transfer efficiency for photocatalysts.Herein,a new 2
【机 构】
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School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of
论文部分内容阅读
Low-efficiency charge transfer is a critical factor to limit the photocatalytic H2 evolution activity of semiconductor photocatalysts.The interface design is a promising approach to achieve high charge-transfer efficiency for photocatalysts.Herein,a new 2D/2D atomic double-layer WS2/Nb2O5 shell/core photocatalyst (DLWS/Nb2O5) is designed.The atom-resolved HAADF-STEM results unravel the presence of an unusual 2D/2D shell/core interface in DLWS/Nb2Os.Taking advantage of the advanced femtosecond-resolved ultrafast TAS spectra,the average lifetime of charge carriers for DLWS/Nb2O5(180.97 ps) is considerably shortened as compared to that of Nb2O5 (230.50 ps),strongly indicating that the 2D/2D shell/core interface enables DLWS/Nb2O5 to achieve ultrafast charge transfer from Nb2O5 to atomic double-layer WS2,thus yielding a high photocatalytic H2 evolution rate of 237.6 μmol/h,up to 10.8 times higher than that of pure Nb2O5 nanosheet.This study will open a new window for the development of high-efficient photocatalytic systems through the interface design.
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