Abstract: Decomposition products from H2SO4 and H2O2，hydroxyl radical，was used for the surface treatment of the graphite felt electrode.Cyclic voltammetry and AC impedance measurements showed that the treated graphite felt cathode and anode peak current increased by 160.96% and 120.24% respectively，the polarization reaction resistance from 74.95Ω·cm2，was significantly reduced to 18.92Ω·cm2.The infrared spectra indicated that the treated surface contains a large number of oxygen-containing hydrophilic groups，and the Raman spectroscopy results show that the graphitization degree lower.This is further evidence of the graphite felt electrode surface by varying degrees of oxidation.XPS tests show that the oxygen content has an increase of 0.58%，quantitative proof of the infrared and Raman spectra of the test results.The static single-cell test results show that the treatment of charge-discharge capacity increased by 37.04% and 22.22% respectively.These analyzes confirmed that this method can significantly improve the vanadium redox flow battery performance.

Key words: all vanadium redox flow battery, gaphite felt, hydroxyl radical

摘要： 采用H2SO4和H2O2的分解产物羟基自由基，对石墨毡电极进行表面处理。循环伏安法和交流阻抗测试显示，处理后石墨毡的阴阳极峰电流分别提高160.96%和120.24%，极化反应电阻从74.95 Ω·cm2显著降低至18.92 Ω·cm2。红外光谱测试表明石墨毡处理后表面含有大量含氧亲水基团，拉曼光谱测试结果显示处理后石墨毡的石墨化度降低，进一步证明了石墨毡电极表面受到了不同程度的氧化。X射线光电子能谱测试显示石墨毡处理后的含氧量提高0.58%，定量地证明了红外光谱和拉曼光谱的测试结果。采用自制静态单电池对石墨毡电极进行测试，处理后石墨毡的充放电容量分别提高37.04%和22.22%，表明该方法处理石墨毡电极能够显著提高全钒液流电池性能。

关键词: 全钒氧化还原液流电池, 石墨毡, 羟基自由基