2d/2dtio2/G-C3n4 Ultrathin Nanosheet as an Efficient Biomimetic Photocatalyst for Conversion of Co2 and Ch4

Abstract

The synthesis of high value-added chemical products from CO2 and CH4 is a promising approach of CO2 utilization, which could not only reduce the negative impact of the greenhouse effect, but also alleviate the energy crisis. C3N4 materials with different dimension (D) were applied to a CO2-CH4 photocatalytic system.  The results show that 2D C3N4  exhibited the best catalytic performance, with a high CO yield of 50.08 umol g −1 . The 2D/2D TiO2 /g-C3N4 heterostructure was constructed.  It was worth noting that the yield of CO reached 173.80 umol g −1 , and the catalytic performance was increased by 1546% compared with bulk C3N4 . Moreover, the work function and adsorption energy of different C3N4 /TiO2 models for CO2 adsorption were calculated by density functional theory (DFT). Based on experimental results, a possible catalytic mechanism for the photocatalytic conversion of CO2 and CH4 is proposed.

Keywords: photocatalytic, CO2, CH4, 2D/2D TiO2/g-C3N4, Conversion