摘要
The methanation of CO_(2) using green hydrogen not only consumes CO_(2) as a carbon resource but also stores H_(2) with high density.However,the activation of CO_(2) molecules under mild conditions is challenging due to their inert nature.Herein,we report an efficient photothermal catalytic system using light irradiation which realizes the complete conversion of CO_(2) to methane without external heating.Over optimum bimetallic Ni Fe nanoparticles(NPs)with a Ni/Fe atomic ratio of 7,the CO_(2) conversion can reach up to 98%with a CH_(4) selectivity of 99%,and no catalyst deactivation was observed for more than 100 h,outperforming the reported catalysts.The catalytic performance is strongly dependent on the structure promoters,light absorption efficiency,Ni Fe particle sizes,and Ni/Fe ratio.The Ni Fe alloy NPs with an average size of~21 nm dispersed on alumina nanosheets are evidenced to enhance the localized surface plasmon resonance(LSPR)effect,thus efficiently triggering the CO_(2) methanation.This work emphasizes and clarifies the important role of LSPR in CO_(2) hydrogenation,which may benefit the rational utilization of CO_(2) using solar power.
基金
supported by the National Natural Science Foundation of China (92145301,22121001,22222206,and U22A20392)
the Fundamental Research Funds for the Central Universities (20720220008 and 20720220021)。
