Results show low current (75 mA) and neutral condition (pH=7) could support effective production of H2O2 by ACSS cathode. Moreover, the hybrid cathode could effectively catalyze H2O2 decomposition to form highly reactive hydroxyl radicals. We also tested the cathode performance while saturated with the pollutant, an important aspect giving that activated carbon will simultaneously support adsorption while acting as H2O2 producing cathode. By using anodic oxygen supply, the accumulative H2O2 concentration after 50 min reached 11.5 mg/L in 0.05 M Na2SO4 at a current of 75 mA. Herein, a cost-effective activated carbon/stainless steel (ACSS) hybrid cathode is reported to achieve simultaneous electrogeneration and activation of H2O2 without external oxygen supply or aeration. Conventional efficient cathode materials (e.g., graphite felt, carbon foam, porous carbon, and carbon aerogel) are relatively expensive, and H2O2 activation by Fe2+ may cause secondary pollution. Effective electrogeneration and activation of H2O2 are two significant processes for Electro-Fenton (EF) system.
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