Fig. 4From: InGaN-based photoanode with ZnO nanowires for water splitting a Photocurrent density versus potential for samples with and without ZnO nanowires in 0.5 M/l Na2SO4 solution under sunlight illumination. b Photocurrent density versus time for samples with and without ZnO nanowires under applied potential of 1.23 V versus RHEBack to article page