Abstract: Platinum titanium served as the anode, while a carbon black polytetrafluoroethylene (C/PTFE) gas diffusion electrode was utilized as the cathode in order to facilitate the production of H₂O₂ through low-amperage electrolysis, with the aim of inhibiting the growth of Microcystis aeruginosa. Through a series of experimental investigations involving varying electrolysis time, current density, and gas flow, the optimal conditions for inhibiting Microcystis aeruginosa were determined. Specifically, the optimal configuration involved the electrolysis of 100 mL of 5×10⁵ cells/mL algae solution at a current density of 10 mA/cm² and a gas flow rate of 0.4 L/min for a duration of 60 minutes. Following electrolysis, the optical density (OD₆₈₀) of the algae cells decreased from 0.035 to 0.003, indicating the complete inhibition of algae cell growth. Additionally, the measurement of chlorophyll fluorescence parameters, such as F_v/F_m, Y(Ⅱ), and Y(NO), demonstrated the substantial disruption to the photosynthetic mechanism of the algae, further indicating the complete decay of the algae population. The concentration of H₂O₂ generated during electrolysis was determined to be 79 mg/L. Furthermore, even after six cycles of reuse, the C/PTFE cathode maintained 66% (52 mg/L) of the initial H₂O₂ concentration, highlighting the excellent stability and promising application potential of the C/PTFE electrode. This study presents a novel approach to effectively inhibit cyanobacterial blooms through low-amperage electrolysis, offering a new avenue for remediation.

Key words: gas diffusion electrode, low-amperage electric current, hydrogen peroxide, microcystis aeruginosa, inhibiting effect