摘要：SummaryNowadays, photoelectrocatalytic (PEC) reduction of CO2represents a very promising solution for storing solar energy in value-added chemicals, but so far it has been hampered by the lack of highly efficient catalyst of photocathode. Enlightened by the Calvin cycle of plants, here we show that a series of three-dimensional C/N-doped heterojunctions of Znx:Coy@Cu are successfully fabricated and applied as photocathodes in the PEC reduction of CO2to generate paraffin product. These materials integrate semiconductors of p-type Co3O4and n-type ZnO on Cu foam to construct fine heterojunctions with multiple active sites, which result in excellent C-C coupling control in reduction of CO2. The best catalyst of Zn0.2:Co1@Cu yields paraffin at a rate of 325 μg·h−1under −0.4 V versus saturated calomel electrode without H2release. The apparent quantum efficiency of PEC cell is up to 1.95%.Graphical AbstractDisplay OmittedHighlights•Heterojunctions of Znx:Coy@Cu are applied in photoelectrocatalytic reduction of CO2•Multiple active sites result in excellent C-C coupling like natural photosynthesis•Photoelectrocatalytic system can tolerate the higher voltage without H2emission•Paraffin product is reported for the first time in CO2reductionCatalysis; Electrochemical Materials Science; Materials Design
