The temperature of the solution was adjusted to 35 C with a WiseCircu1 WCB-11 bath. A Si/BDD thin-film electrode (2.5 cm2) from Adamant1 (500 ppm B) was used as the anode and a 2.5 cm2 carbon-PTFE air-diffusion electrode from Electrocell1 was used as the cathode. The cathode was fed with compressed air
flowing at 1.0 L min1 for H2O2 generation. The trials were performed at constant current provided by an MCP M10-QD305 power supply. In SPEF, the solution was irradiated directly by sunlight