1d / 0d H-Bs Nts/Czs-X Heterojunction with Strong Interfacial Electric Field Coupling Enhanced Mass Transfer Based on Gas-Liquid-Solid Micro Interface Contact for Efficient Photothermal Synergistic Catalytic Co2 Reduction to Syngas

Abstract

The reduction of CO 2 to syngas by visible light-driven H 2 O is an attractive process, but this reaction is often limited by the poor mass transfer of CO 2 in the liquid phase and the poor separation and mobility of photocatalyst carriers. In this paper, Cd X Zn 1-X S nanospheres uniformly decorated hollow Bi 2 S 3 nanotube heterojunction for photocatalytic CO 2 reduction was successfully fabricated by in situ electrostatic self-assembly method. The yields of CO and H 2 over 15% H-BS NTs/CZS-0.5 was 32.11 μmol∙g -1 ∙h -1 and 33.10 μmol∙g -1 ∙h -1 without any sacrificial agent, which was 24.0 and -6.3 times than that of CZS-0.5, accordingly. The excellent activity was mainly attributed to the strong interfacial electric field formed between H-BS NTs and CZS-0.5, which derived the rapid separation and transfer of charges dynamically. Meanwhile, the photo-thermal catalysis with the novel gas-liquid-solid micro reactor inhibited efficiently the interface contact of the hydrogen evolution reaction and thermodynamically accelerated the rate of photocatalytic reduction of CO 2 . The accelerated photogenerated charge transfer was investigated in detail by ultrafast spectroscopy, photoelectrochemical testing and in situ Kelvin probe force microscopy. The results provided a new idea for promoting interfacial mass transfer, as well as photo-thermo-electric fields coupling to improve activity and selectivity.

Keywords: Interface electric field, Thermo-photocatalysis, CO2 reduction, Syngas, electrostatic self-assembly