Insight into the Active Site in Electrochemical CO2 Reduction of Self-Supported Cobalt Phthalocyanine Anchored on ZnIn2S4 Nanoarrays

Electrocatalytic CO2 reduction into value-added fuels is a promising and economical strategy to mitigate CO2 emissions. Herein, a self-supported cobalt phthalocyanine anchored on chrysanthemum-like ZnIn2S4 nanoarray electrode was prepared. By integration of experimental analysis and density functional theory calculation, the CoPc molecule was anchored with hexagonal ZnIn2S4 (ZIS) via S-C and Co-S interaction. The active site for CO2RR in ZIS-CoPc was attributed to Co sites. For hydrogen evolution reaction, the active site was mainly ascribed to the S site on the surface of ZIS.