Earth-abundant Fe oxide-based catalysts,renowned for their broad-spectrum light absorption,hold promise for driving the photothermal RWGS reaction—a promising strategy for converting CO2 emissions into valuable carbonaceous feedstocks.However,traditional Fe oxide-based catalysts exhibit limited activity due to their constrained H2 dissociation and CO2 activation capabilities,especially at lower temperatures.This study in-troduces Co,Ni,and Cu-doped Ce0.7Fe0.3O2 solid-solution catalysts.Incorporation of Fe into CeO2 enhances CO2 dissociation while preserving extensive light adsorption up to 2500 nm.Notably,Co doping enhances H2 dissociation and promotes CO2 activation.Subsequent investigations reveal that a catalyst doped with 5 mol％Co exhibits the highest photothermal catalytic activity,attaining a～50％CO2 conversion under 300 W Xe-lamp irradiation with excellent selectivity and stability over 10 reaction cycles spanning 10 h.These results under-score the potential of designing CeO2-based solid solution catalysts with synergistic metal dopants for efficient and selective CO2 conversion under moderate conditions.
Reverse water-gas shift reactionSolid solutionCeriaIron-based catalystTransition metal doping
Yi Xie、Wenhao Qin、Linyu Wang、Yueren Liu、Haoyang Jiang、Miao Zhong
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College of Engineering and Applied Sciences,National Laboratory of Solid State Microstructures,The Frontiers Science Center for Critical Earth Material Cycling,Nanjing University,Nanjing,210023,China
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