Enhanced room temperature CO2 photoreduction on gas-solid interfaces using nanocrystals integrated with ZIF-8 wrapping design

Abstract

Composites derived from metal-organic frameworks (MOFs) show promise as catalysts for the photocatalytic reduction of CO2. However, their potential is hindered by constraints such as limited light absorption and sluggish electron transfer and separation, impacting the overall efficiency of the photocatalytic process. In this study, TiO2 nanocrystals, modified with Ptx+, underwent laser etching were encapsulated within the traditional MOF-ZIF-8 framework. This enhanced the adsorption capabilities for CO2 reactants and solar light, while also facilitating directed electron transfer and the separation of photogenerated charges. The finely-tuned catalyst demonstrates impressive CH4 selectivity at 9.5 %, with yields of 250. 24 μmol g-1 h-1 for CO and 25.43 μmol g-1 h-1 for CH4, utilizing water as a hole trap and H+ source. This study demonstrates the viability of achieving characteristics related to the separation of photogenerated charges in TiO2 nanocrystals through laser etching and MOF composite catalysts. It offers novel perspectives for designing MOF-based catalysts with enhanced performance in artificial photosynthesis.