Fig. 6: Normalized PEC photocurrent stability test of CsPbBr3 photoanodes with various protective catalytic sheets at +1.23 VRHE under 1 sun illumination in aqueous 1 M NaOH (pH 14).
The sample with GC was stopped because the electrolyte turned yellow in the first hours due to degradation. The one with GS/NiFeOOH was stopped at 80 h because the device had already lost 90% of its initial photocurrent. The one with GC/NiFeOOH was stopped when photocurrent reached a linear steep decay of 5% h−1 for 1 day, which was clearly irreversible. The one with BDD/NiFeOOH lost 10% photocurrent in the first hours and remained stable beyond that. The ones with GC/Ni/NiFeOOH and BDD/Ni/NiFeOOH showed practically no degradation (just 3% and 2% upon 135 h, respectively).
