“…15–17 However, the PEC performance of CuWO 4 photoanodes is seriously impeded by the poor charge transfer and slow surface reaction kinetics. 18,19 Up to date, numerous strategies including controlling the morphology, 20 doping with exotic elements, 21 establishing heterojunctions, 22–24 loading with precious metals, 25 and incorporating with surface cocatalysts, 26 have been proposed to improve the PEC performance of CuWO 4 photoanodes. Particularly, constructing heterostructures with a built-in electric field is one of the most effective strategies to accelerate photogenerated charge separation and transfer.…”