Regioselective Cation Exchange Reaction for Photoelectrochemical Water Splitting

Engineering copper sulfide-based heterostructures via cation exchange(CE)is an appealing approach,as it allows selective combination of distinct compositions and func-tions of metal sulfides.These heterostructures can play a significant role in photoelectrochemical applications,but the effect of the ratio between two or more domains in such heterostructures on the photoresponse has not been well explored.In this work,we synthesized Cu1.81S/CdS nano-plate heterostructures through a regioselective CE reaction.