Figure 3: Perovskite photocathode performance during H₂ photogeneration.

(a) Typical linear sweep voltammetry of the perovskite-based photocathode at a scan rate of 5 mV s⁻¹. The arrow denotes the scan direction. (b) Chronoamperometric trace recorded at an applied potential of 0 V versus RHE. An aqueous buffer solution (0.1 M borate, pH 8.5), chopped solar light irradiation (AM 1.5 G, 100 mW cm⁻², λ>400 nm) and an inert (N₂) atmosphere at room temperature were used in both experiments.