Modulation of Cu/Cu2O Nanoparticles to Promote the Photocurrent Response for Light-Enhanced Pseudocapacitive Charge Storage

Copper metal/copper oxide (Cu/Cu2O) hybrid nanoparticles (HNPs) were grown on carbon cloth by an electrodeposition method. The ratio of Cu2O in these HNPs was increased by calcination in air, remarkably promoting the photocurrent response by 150%. This CC@Cu/Cu2O photoelectrode delivered a high specific capacitance of 166 mF cm(-2) (at 5 mA cm(-2)) under light irradiation, exhibiting a light enhancement of 17.7%. In addition, a high retention of 92% can be achieved after 5000 cycles with light.