Fig. 9.
Demonstration of electrolytic degradation of Cu2Se electrode and its sun-light induced self-repairing. Variations in (a) peak anodic current (Ja) and oxidation potential, and (b) peak cathodic current and reducing potential with the number of cycles under dark and light illumination. Numbers (1), (2), and (3) denote CV ranges for EC measurements in dark (No. of cycles 1–6), unbiased in dark (2 min time interval between 6 and 7) and EC measurements in solar light illumination ((No. of cycles 7–12)). Same is repeated for another EC degradation and PEC repairing cycle. XRD data of electrodes made with (c) stoichiometric (Cu2Se) copper selenide and (d) Cu1.3Se before and after EC and PEC cycles. Insets shows photographs of electrodes after EC and PEC measurements.