Abstract
In this work, an efficient photocatalytic material was prepared directly on Indium tin oxide (ITO) glass substrates by fabricating Cu2S and graphene oxide onto graphene for photoelectrochemical (PEC) water splitting. The double laminated reduced graphene/Cu2S/reduced graphene/graphene oxide (RG/Cu2S/RG/GO) nanofilms were characterized, and an enhanced photoelectrochemical response in the visible region was discovered. The photocurrent density of the nanofilms for PEC water splitting was measured to be up to 1.98mA/cm2, which could be ascribed to the followings: (i) a higher efficiency of light-harvesting because of GO coupling with Cu2S that could broaden the absorbing solar spectrum and enhance the light utilization efficiency; (ii) a stepwise structure of band-edge levels in the Cu2S/GO electrode was constructed; (iii) double laminated electron accelerator (RG) was used in the Cu2S/GO materials to get better electron-injecting efficiency.
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