The　electrocatalytic　activity　towards　two　electron　oxygen　reduction　reaction　of　graphite　felt　was　advanced　by　incorporating　carbon　nitride,　carbon　nanotubes　and　polytetrafluoroethylene　through　vacuum　filtration,　which　prevented　the　cleavage　of　O-O　bond,　facilitated　the　charge　transfer,　and　established　more　three-phase　active　sites.　To　ameliorate　the　oxygen　transfer　process,　the　configuration　of　side-aeration　was　proposed,　providing　forced　convection　to　reduce　the　thickness　of　diffusion　layer,　and　increasing　the　dissolved　oxygen.　By　simplified　combination　of　refining　the　orientation　of　gas　flow　and　modified　graphite　felt,　the　dual-chamber　configuration　rendered　a　qualitative　leap　in　H2O2　generation　capacity　to　4.44–6.89　mg　h−1　cm−2.　The　alkaline　affinity　of　developed　system　was　discussed　in　terms　of　a　beneficial　outer-sphere　electron　transfer　pathway,　the　variation　on　adsorption　strength　of　oxygenated　species　and　working　electrode　potential　range.　Finally,　Long-term　operation　stability　and　successful　application　in　Electro-Fenton　indicated　great　potential　of　developed　system　for　H2O2　synthesis　and　environmental　remediation.　©　2023　Elsevier　B.V.