A ZnO/ZnO:Cr isostructural nanojunction electrode for photoelectrochemical water splitting

In the designed ZnO:Cr/ZnO isostructural nanojunction, ZnO:Cr nanosheets with intragap Cr impurity states increase optical absorption; ZnO nanorods provide a direct pathway to transport photogenerated electrons for collection in the external circuit. As a result, the nanojunction showed superior performance for solar water splitting, compared to its constituent components alone.