Hydrogen peroxide in-situ electrosynthesis using micropore-adjusted gas diffusion electrode and application in wastewater

A micropore-adjusted gas diffusion electrode (MAGDE) is prepared using CBCNT (Mixture of carbon black and carbon nanotubes), polytetrafluorethylene (PTFE), wood pulp and filler. Meantime, an in-situ electrosynthesis process of hydrogen peroxide is constructed by a MAGDE cathode and a carbon felt anode. The results show that when the optimal mass ratio of PTFE:pulp:filler:CBCNT is 1.5:0.15:3:1, H 2 O 2 yield can reach to 99.8 mg/(L.cm 2 ) in 90 min. Under the optimal parameters of 60 mA/cm 2 and pH of 3, H 2 O 2 yield can reach to 114.4 mg/(L.cm 2 ). For 20 mA/cm 2 , current utilization efficiency and energy consumption are 76.5 % and 8.6 KWh/kg in 30 min, respectively. A series of tests show that when filler is added, surface porous characteristics, electroactive surface and oxygen transfer ability are all improved and possible mechanisms on H 2 O 2 yield increment are suggested. H 2 O 2 yield and wastewater treatment show that the prepared MAGDE is effective and the preparation process is feasible.