Hierarchical ZnO nanorod electrodes: Effect of post annealing on structural and photoelectrochemical performance

► The article describes the post annealing effect of ZnO nanorods. ► The conventional radiant annealing deformed the nanorods than the microwave treatment.. ► Microwave and conventional post annealing reduces the photocurrent compared to the as-deposited. ► This is due to the poor charge transport in the deformed electrodes.