Fabrication of WO3/Cu2O composite films and their photocatalytic activity

► WO3/n-Cu2O and WO3/p-Cu2O composite films were electrochemically fabricated. ► Photocatalytic activity of WO3/p-Cu2O composite film is higher than WO3/n-Cu2O. ► WO3/p-Cu2O composite film has a high catalytic stability.