介孔炭空气扩散电极电催化氧化产过氧化氢的影响

以压片法制备了介孔炭空气扩散电极,优化制备工艺,并将其用于自制的电化学降解装置中,以求高效产H_2O_2的能力和提高对气态污染物的降解效率。结果表明,当介孔炭与PTFE乳液质量比为3∶1、压片压力为15 MPa、在管式炉中300℃焙烧1 h后,所制得的介孔炭空气扩散电极性能最佳。在鼓气速率为6 L/h、电解质浓度为0.8 mol/L的Na_2SO_4溶液、电流密度为30 m A/cm~2、污染物含量12%时,能高效生成H_2O_2,浓度为1 598 mg/L。制作的空气扩散电极在数次使用之后,仍能保持良好的产H_2O_2能力。

Electrocatalytic Oxidation of Mesoporous Carbon Air Diffusion Electrode for Producing H2O2

A mesoporous carbon air diffusion electrode was prepared by tablet compression method. The preparation process was optimized. It was used in a self-made electrochemical degradation device to produce H2O2 efficiently and improve the degradation efficiency of gaseous pollutants. The results shows that when the mass ratio (mesoporous carbon to PTEE emulsion) and compression pressure are 3:1 and 15 MPa, respectively, the mesoporous carbon air diffusion electrode has the best performance after calcining at 300 °C in a tube furnace for 1 h. when the gas rate, the electrolyte concentration, the current density and the contaminant content are 6L/h, 0.8mol/L, 30mA/cm2, 12%, respectively, H2O2 can be efficiently generated, and the concentration is 1598mg/L.. The fabricated air diffusion electrode can maintain good H2O2 production capability after several applications.