Non-trivial Topological Surface States Regulation of 1T-OsCoTe2 Enables Selective C-C Coupling for Highly Efficient Photochemical CO2 Reduction Toward C2+ hydrocarbons
Abstract
Despite ongoing research, the rational design of nontrivial topological semimetal surface states for the selective photocatalytic CO2 conversion into valuable products remains full of challenges. Herein, we present the synthesis of 1T-OsCoTe2 for the photoreduction upgrading of CO2 to tricarbon alkane C3H8,by the integration of experimental work and theory calculation. Experimental studies suggested a high electron based selectivity of 71.2% for C3H8 and an internal quantum efficiency of 54.6% at 380 nm. In-situ X-ray photoelectron spectroscopy and X-ray absorption fine structure spectroscopy demonstrated that Co and Os atoms coordinated with Te atoms enable an efficient Os-Te-Co electron transfer to activate the generation of *CH3,*CHOCO and *CH2OCOCO. Density functional theory calculations further confirmed Os-Te-Co electron bridging on the improved CO2 conversion kinetics. To our knowledge, this is the first report suggesting the role of Os atoms in accelerating the photocatalytic CO2 conversion activity of the topological semimetal 1T-OsCoTe2.
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