Synthesized of ZnO/CdZnS/CdS core-shell nano cable arrays using by chemical vapor transport method for highly efficient photoelectrochemical hydrogen generation

Vertically-aligned high-density ZnO/CdZnS/CdS core-shell nanocable arrays were synthesized on large-area Ti substrates. The outer layers were deposited on the pre-grown vertically-aligned ZnO nanowire arrays, using the chemical vapor transport method. Their shell composition controlled by growth temperature and reaction time. The structural and optical analysis suggests the formation of CdZnS alloy in the interface region between the ZnO core and CdS shell, which would enhance the charge separation by reducing the lattice mismatch. We suggest that the formation of the CdZnS intermediate layers contributes to the higher photoelectrochemical cell performance of the ZnO-CdS nanocables.