介孔炭基复合阴极的制备及其产H_(2)O_(2)性能研究

Preparation of Mesoporous Carbon Composite Cathode and Its Hydrogen Peroxide Production Performance

近年来,气体扩散电极因可以使氧气/空气从外部供应到阴极表面,而不需要在电解质中溶解,在提高H_(2)O_(2)的电化学合成效率方面得到了广泛的关注。该文以介孔炭为催化层材料,购买的商业碳黑和石墨作为扩散层材料制备电极。从产H_(2)O_(2)量和电流效率可以看出,当催化层为介孔炭且与PTFE乳液的比例为2∶1,扩散层为碳黑且与PTFE乳液的比例为1∶3时,在鼓气速率为18 L/h、电解质为200 mL 0.5 mol/L的Na_(2)SO_(4)溶液、电流密度为10 mA/cm^(2)、初始pH值为11.0的条件下,能高效生成H_(2)O_(2),60 min产H_(2)O_(2)量为47 mmol/L,且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_(2)O_(2)能力。

In recent years,gas diffusion electrodes(GDE)have gained much attention in improving the efficiency of electro⁃chemical synthesis of H_(2)O_(2) as they allow oxygen/air to be supplied to the cathode surface from outside without dissolving in the electrolyte.In this paper,mesoporous carbon was used as the catalytic layer material and purchased commercial carbon black and graphite were used as the diffusion layer materials to prepare the electrodes,respectively.From the amount of H_(2)O_(2) produced and the current efficiency,it can be seen that when the catalytic layer is mesoporous carbon and the ratio with PTFE emulsion is 2∶1,and the diffusion layer is carbon black and the ratio with PTFE emulsion is 1∶3,at a drumming rate of 18 L/h,an electrolyte of Na_(2)SO_(4) solution with a concentration of 0.5 mol/L,a current density of 10 mA/cm^(2) and an initial pH value of 11.0,it can efficiently produce H_(2)O_(2) production as 47 mmol/L for 60 min.The air diffusion electrode was also able to main⁃tain good H_(2)O_(2) production after several uses.