Abstract
Increasing the utilization efficiency of photogenerated electrons is highly recognized as one of the efficient approaches to boost the photocatalytic CO2 conversion efficiency. Herein, ZIF-67-derived porous carbon (PC) material was employed for the construction of PC@ultrafine Bi12O17Br2 nanotubes (PC@BOB NTs) composites through a facile solvothermal synthesis in order to optimize the use of excited electrons in the BOB NTs. Photoelectrochemical characterization results revealed that the introduction of PC material achieved a faster charge separation rate in the PC@BOB composites, ensuring more photogenerated electrons participate in the CO2 adsorption and activation process. Moreover, the pore structures of ZIF-67-derived PC material provided abundant confined spaces for the enrichment of CO2 molecules. After 5 h of Xenon lamp irradiation, PC@BOB composites exhibited obviously increased photocatalytic CO2 reduction activity in the pure water. When the addition amount of PC was 5 wt%, the PC@BOB-2 composite showed the highest CO evolution rate of 359.70 µmol/g, which was 2.95 times higher than that of the pure BOB NTs. This work provides some independent insights into the applications of Metal-Organic Framework (MOF)-derived hierarchical porous structures to strengthen the CO2 enrichment, as well as the excited charge utilization efficiency, thus achieving a high solar-to-fuel conversion efficiency.
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