Membrane‐free Electrolysis Production of Hydrogen Peroxide on Low‐Cost Metal‐Free Electrocatalysts for Dye Degradation

The efficient production of hydrogen peroxide (H2O2) 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‐SO3H) were prepared as the cathode materials for 2e‐ ORR. In a 2 M KHCO3 solution, an overall Faradaic efficiency of 97% and a total H2O2 production rate of 1872 mmol g‐1 h‐1 over metal‐free electrodes were accomplished in a membrane‐free flow cell. The dilute H2O2 solution could be directly used to degrade cationic Rhodamine B or methyl orange and anionic methylene blue dyes in water. This work proved low‐cost production of dilute H2O2 solution in simple membrane‐free flow cells with single electrolyte and on‐site utilization for efficient dye degradation.