CsPbBr3 perovskite quantum dots anchored on multiwalled carbon nanotube for efficient CO2 photoreduction

Abstract

Converting CO2 into valuable fossil fuels through artificial photosynthesis is regarded as an appealing approach to address the problems of global warming and energy crisis, which primarily depends on the development of robust and effective photocatalysts. Herein, we illustrate the construction and fabrication of a multiwalled carbon nanotube (MWCNT)/CsPbBr3 perovskite quantum dots (QDs) nanocomposite with efficient CO2 photoreduction activity. In this photocatalytic system, the highly conductive MWCNT acts as an electron acceptor to inhibit the carrier recombination in the CsPbBr3 QDs. When the content of MWCNT was 4.0 wt%, the resultant CsPbBr3/MWCNT exhibited the optimum photocatalytic performance, with the yields of CO and CH4 3.14 and 2.13 times that of pristine CsPbBr3 QDs, respectively. The rapid electron extraction and transfer from CsPbBr3 QDs to MWCNT, as well as the enhanced visible light harvesting ability accounted for the remarkable photocatalytic performance. This work is anticipated to provide new pathway for designing efficient perovskite-based photocatalyst in energy conversion applications.