Cds-MoS2 heterostructures on Mo substrates via in situ sulfurization for efficient photoelectrochemical hydrogen generation

摘要

A CdS-MoS2 photoelectrode with a double-layer core-shell structure was prepared using a simple electrodeposition-in situ sulfurization method on a Mo substrate. The photocatalytic activity of asprepared electrodes was evaluated using a photoelectrochemical H-2-generation experiment. The photocurrent and photon-electron conversion efficiency of the CdS-MoS2 photoelectrode were nearly double those of a CdS photoanode prepared on FTO glass. The high activity of the CdS-MoS2 photoelectrode was due to the higher separation efficiency of carriers caused by the formed CdS-MoS2 Janus heterojunction structure, which made directional transmission and electron-hole separation possible. Our experiments show that, in addition to being a good co-catalyst in powder material for photocatalytic hydrogen production, MoS2 can also be used as an electron acceptor layer to enhance electron-hole separation.