Fig. 3From: Enhanced photoelectrocatalytic performance of α-Fe2O3 thin films by surface plasmon resonance of Au nanoparticles coupled with surface passivation by atom layer deposition of Al2O3 Surface morphology of Fe2O3-Au electrodes with different Au sputtering time. a 10 s; b 15 s; c 25 s; d 35 s. The sputtering current is 30 mA • cm−2. All electrodes are annealed at 300 °C for 1 h after the sputtering of AuBack to article page