“…Although the solid polymer electrolyte (SPE) technology employing proton-exchange membrane has been developed to achieve a high EOP efficiency, ,, it still suffers from these intractable issues of the relatively low OER potential and the unfavorable gaseous ozone escaping (when O 3 gas is the target product instead of the ozone-dissolved water in the common SPE-based EOP , ), which hopefully provide a room for further improving the gaseous ozone productivity. According to the commonly accepted EOP mechanism, O 3 formation depends essentially on the intermediate reaction between the hydroxyl free radical-derived active atomic oxygen and the adsorbed oxygen molecule, while the later will competitively desorb into gaseous O 2 as an OER process. ,,− In theory, an increased level of adsorbed oxygen molecule will increase the reaction barrier to eq , and simultaneously benefit the ozone formation. Additionally, aimed at preventing these as-generated O 3 from the undesirable quick decomposing in a large quantity of electrolyte, it is necessary to find an effective yet simple solution by shortening the gaseous O 3 escaping distance to atmosphere.…”