Abstract
In this study, we explore the charge transfer mechanism between WO(3) and Cu(2)O in heterostructured WO(3)/Cu(2)O electrodes and in a WO(3)||Cu(2)O tandem photoelectrochemical cell. The physical-chemical characterizations of the individual WO(3) and Cu(2)O electrodes and the heterostructured WO(3)/Cu(2)O electrode by XRD, XPS, and SEM methods confirm the successful formation of the target systems. The results of photoelectrochemical studies infer that in both the heterostructured WO(3)/Cu(2)O electrode and WO(3)||Cu(2)O tandem photoelectrochemical cell, the major mechanism of charge transfer between WO(3) and Cu(2)O is a realization of the Z-scheme.