不同石墨与聚四氟乙烯质量比涂层对电极产H_(2)O_(2)效能的影响

Effects of different mass ratio of graphite to PTFE coating on H_(2)O_(2) production efficiency of electrodes

以石墨板电极作为阴极基体,考察不同石墨与聚四氟乙烯(PTFE)质量比涂层对电极表面亲疏水性、H_(2)O_(2)产量、电流效率以及能耗的影响和电极重复使用性能。结果表明:石墨粉和PTFE质量比过高或过低都不利于产H_(2)O_(2),电极表面疏水性越强,产H_(2)O_(2)效果越好。当石墨粉和PTFE质量比为1∶0.23时,电极表面疏水性最强,H_(2)O_(2)产量最高,达到291.92 mg/g;该电极电流效率最高、能耗最低,反应60 min时的电流效率为28.52%,能耗为30.40 kW·h/kg。电极循环使用7次后产H_(2)O_(2)性能仅下降10%左右,显示出较好的重复使用性能。

The effects of different mass ratio of graphite powder to polytetrafluoroethylene(PTFE)coating on hydrophilicity and hydrophobicity of the electrode surface,H_(2)O_(2) production,current efficiency,energy consumption,and electrode reusing performance were investigated using graphite plate electrode as cathode substrate.Results showed that too high or too low mass ratio of graphite powder to PTFE was not conducive to H_(2)O_(2) production.The stronger the hydrophobicity of the electrode surface was,the higher the H_(2)O_(2) production was.When the mass ratio of graphite powder to PTFE was 1∶0.23,the electrode surface had the strongest hydrophobicity,and the H_(2)O_(2) production was the highest,which reached 291.92 mg/g.The electrode had the highest current efficiency and the lowest energy consumption.The current efficiency was 28.52% and the energy consumption was 30.40 kW·h/kg when the reaction time was 60 minutes.The performance of H_(2)O_(2) production decreased by about 10%after the electrode was recycled for 7 times showing good reusability.