Cu₂O/Cu₂S microstructure regulation towards high efficiency photocatalytic hydrogen production and its theoretical mechanism analysis

Abstract

Cu2O with cubic structure was prepared by water bath method, and then Cu2O/Cu2S core-shell material was obtained by the REDOX reaction of Cu2O and Na2S with the prepared cubic Cu2O...

Mo4+-Doped CuS Nanosheet-Assembled Hollow Spheres for CO2 Electroreduction to Ethanol in a Flow Cell

“…The HRTEM images of different areas on Mo 9.0% –CuS after the stability test show that the (102) crystal plane of hexagonal CuS is well remained in most areas (Figure S7e), while the (110) crystal plane of tetragonal Cu 2 S (JCPDS no: 72-1071) is present in small part areas besides (102) crystal plane of hexagonal CuS (Figure S7f), suggesting that a small amount of Cu 2+ species on the catalyst surface are in situ electroreduced to Cu + species in CO 2 RR. The Cu 2p XPS spectrum of postcatalytic Mo 9.0% –CuS appears two new peaks at 931.6 and 951.4 eV, which can be attributed to Cu 2p 3/2 and Cu 2p 1/2 of Cu + (Figure S8a), proving that some Cu + species are produced in CO 2 RR. The result is further verified by the corresponding Cu LMM Auger spectrum, where a new peak of Cu + appears at 572.4 eV, with the peak area ratio of Cu 2+ /Cu + being 1:0.15 (Figure S8b).…”