Abstract
The efficient conversion of CO2 into hydrocarbon fuels(CH4)with high selectivity is considered as a great challenge in photocatalysis owing to the multiple-electron transfer pathway and competitive H2 generation.Herein,we developed carbon dots(CDs)-modulated S-scheme heterojunction of CDs/NiAl-LDH@ln2O3(C-DH@IN)through a facile in-situ hydrothermal method.Thanks to the multi-shell nanotube structure,the C-DH@IN shows an enhanced CH4 evolution rate of 10.67 pmol h-1 g-1 and higher se-lectivity of CH4(85.70％)compared with In2O3 and NiAI-LDH@In2O3 binary catalyst in the pure water without sacrificial agent.Electron spin resonance(ESR)and in situ Fourier transform infrared spectra ver-ify that the constructed S-scheme heterojunction can possess the strong redox capability and the HCOO and CH3O-as critical intermediates play an important role in selective CO2 reduction to generate CH4.Furthermore,CDs with superior photoabsorption can boost the electron transfer and absorb H+,thus im-proving the integration of H+and CO2 molecule.Therefore,this work emphasizes a facile strategy to achieve efficient CO2-to-CH4 conversion based on construction of CDs-based heterojunction catalysts.
基金项目
National Natural Science Foundation of China(21876015)
National Natural Science Foundation of China(21703019)
Qinglan Project Foundation of Jiangsu Province()
NETL
NSTL
万方数据