Abstract
The directional migration of S-vacancy is beneficial to the separation of photogenerated carriers and the transition of electrons in semiconductors. In this study, Bix/Bi2-xSy@carboxylic-cellulose (CC) photocatalyst with bionic chloroplast structure is obtained by electron beam irradiation to induce S-vacancy in Bi2S3@CC. The results of CO2 photoreduction experiments demonstrate that the reduction rate of CO2 to CH3OH by Bix/Bi2‒xS2.89@CC-450 samples is 10.74 µmol·g-1·h-1, and the selectivity is 92.82%. The results show that the inward migration behavior of the borderline S-vacancy (b-Sv) induces the redistribution of electrons in Bix/Bi2-xSy@CC. The Bi° clusters in Bix/Bi2-xSy@CC is conducive to adsorb CO2, and the internal S-vacancy (i-Sv) is conducive to adsorb CH3OH, which accelerate the transfer of gas-phase products to realize the controllable conversion of CO2 and photoreduction products at the gas-liquid-solid three-phase interface. This study provides a new idea for the development and utilization of green photocatalysts in clean energy.
Published Version
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