A　novel　self-breathing　gas　diffusion　electrode　was　developed　by　loading　carbon　nanotubes　(CNTs)　and　carbon　black　(CB)　onto　the　surface　of　graphite　felt　through　vacuum　filtration.　This　electrode　features　a　well-structured　mesoporous　network　and　a　stable　three-phase　interface,　which　enable　efficient　oxygen　mass　transfer　and　enhance　the　self-breathing　capability.　The　incorporation　of　carbon　nanotubes　and　carbon　black　significantly　boosts　the　electrode＇s　catalytic　performance.　In　a　dual-chamber　reactor　operating　at　a　current　density　of　12　mA/cm2　and　an　initial　pH　of　3,　the　system　achieved　an　H2O2　concentration　of　4691　mg/L　within　1　h,　with　an　energy　consumption　of　6.58　kWh/kg　H2O2　substantially　outperforming　conventional　gas　diffusion　electrodes.　The　dynamic　pH　regulation　in　the　dual-chamber　system　optimizes　the　2e-ORR　pathway,　leading　to　corresponding　changes　in　proton　transfer　pathways　and　adsorbed　species　within　the　Helmholtz　plane.　Additionally,　the　presence　of　reactive　hydrogen　(H*)　enhances　the　chemisorption　of　O2　and　facilitates　its　hydrogenation　to　form　the　*OOH　intermediate.　The　electrode　exhibited　excellent　stability,　maintaining　H2O2　yields　above　4000　mg/L　over　5　cycles　and　nearly　complete　degradation　of　the　simulated　contaminants　within　30　min　in　an　electro-Fenton　system　application.　These　results　highlight　the　electrode＇s　potential　for　efficient　H2O2　synthesis　and　environmental　remediation.