新型高效气体扩散电极的制备与性能

Preparation and performance of a new kind of high effective gas diffusion electrode

评述了原位产生H2O2的电化学法污水处理技术中使用的主要电极，研究了用石墨制备高效气体扩散电极的方法。对石墨用HNO3与H3PO4的混合液改性，石墨与聚四氟乙烯的质量比为2：1，电极经350oC煅烧1h，对溶解O2还原产生H2O2的催化活性最高。仅在pH值很低时，电极的活性较差，在pH=3～9时，电极的活性受pH值变化影响较小。在pH=3时电解150min，电极的电流效率始终高于72％，H2O2浓度达到了274．5mg／L。

Some of the main electrodes used as cathodes in electrochemical advanced oxidation processes for in situ electro-generated H2O2 were summarized and a method for the preparation of the high effective gas diffusion electrodes made from graphite was developed in the paper. Under the condition that graphite was modified with the mixed solution consisted of HNO3and H3PO4, the mass ratios of graphite： polytetrafluorethylene was of 2：1 and the electrodes was calcined at 350℃ for 1 h, the catalytic activity of the electrodes was highest. At only pH = 1 the catalytic activity of the electrodes was lower, but at pH = 3 - 9 the catalytic activity of electrodes was higher and stable. At pH = 3 and during the electroanalysis for 150 min, the current efficiency was higher than 72% , and the concentration of H2O2 achieved 274.5 mg/L.