The efficient production of hydrogen peroxide (HO) solution was achieved by combining cathodic two-electron oxygen reduction (2e ORR) and anodic two-electron water oxidation (2e WOR) in two half-reaction cells. h-BN loaded on carbon fibers (h-BN@C) is prepared and employed as an anode material to catalyze 2e WOR, while sulfonated commercial BP-2000 carbons (BP-2000-SOH) were prepared as the cathode materials for 2e ORR. In a 2 M KHCO solution, an overall Faradaic efficiency of 97 % and a total HO production rate of 1872 mmol g h over metal-free electrodes were accomplished in a membrane-free flow cell. The dilute HO solution could be directly used to degrade Rhodamine B, methyl blue and methylene orange dyes in water. This work proved low-cost production of dilute HO solution in simple membrane-free flow cells with single electrolyte and on-site utilization for efficient dye degradation.
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