Abstract
Photogenerated charge separation is a challenging step in semiconductor-based photosynthesis.Though numerous efforts have been devoted to developing multi-component photocatalyst heterostructures for improving charge separation efficiency,the short distance between electrons and holes-aggregated re-gions still leads to undesirable charge recombination.Herein,a facile and commercial in-situ synthesis method was designed to directly prepare a three-component Au-carbon-TiO2 photocatalyst from Ti3C2 MXene,air,CO2,and HAuCl4,in which the carbon layer bridged Au and TiO2 nanoparticles for stable and efficient photocatalytic hydrogen production.Kelvin probe measurements and density functional theory(DFT)calculations demonstrated that a multi-interfacial charge transmission network was successfully constructed to achieve a directional and long-distance spatial charge separation/transfer channel between TiO2 and Au through carbon layer,desirably inhibiting the recombination of photogenerated charge car-riers.The hydrogen production rate of the formed three-component Au/C-TiO2(CTA)photocatalyst was demonstrated to be 27 times higher than that of Au-TiO2,which also surpassed many reported Ti3C2 MXene-derived carbon-TiO2 photocatalysts.This work sheds light on the ingenious use of 2D MXene to form a well-behaved TiO2-based photocatalytic system and helps to propose future design principles in accelerating charge transfer.
基金项目
National Natural Science Foundation of China(21972171)
Fundamental Research Funds for the Central Universities,South-Central MinZu University(CZQ23037)
Fundamental Research Funds for the Central Universities,South-Central MinZu University(CZY23018)
Hubei Provincial Natural Science Foundation,China(2021CFA022)
Innovation and Entrepreneurship Training Program Funded by South-Central Minzu University(S202310524033)
NETL
NSTL
万方数据