Abstract: Hydrogen peroxide production via cathodic reduction of oxygen on self-made gas diffusion electrode was studied in an undivided system. The effects of mass ratio between graphite and PTFE, cathodic potential, pH, and gas flow rate on hydrogen peroxide output were investigated. When the mass ratio between graphite and PTFE was 2:1, pH=3, Na2SO4 concentration was 0.1 mol•L−1, oxygen flow rate was 0.4 L•min−1, and cathodic potential was −0.55 V (vs SCE), hydrogen peroxide concentration could reach about 60 mg•L−1 after 2 h. It had a good hydrogen peroxide output and current efficiency. The pH values applicable to hydrogen peroxide production could be extended to a wide range in this undivided system and this novel gas diffusion electrode system is expected to be applicable in waste water treatment.

Key words: Gas diffusion electrode, Cathodic potential, Oxygen reduction, Hydrogen peroxide, Current efficiency