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Hongkai Guo,Hu Xu,Chengwen Zhao,Xiangzhong Hao,Ziyuan Yang,Weijun Xu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Achieving high catalytic performance with the lowest cost possible cathode material is critical for electrocatalyticsynthesis of H2O2 by oxygen reduction reaction. In this work, we describe a method ofpreparing highly active yet stable graphite felt electrocatalysts containing ultrahigh-loading oxygen contentby using organic acid anodic modification. The results show that modified graphite felt surface wasmore hydrophilic and introduced a large amount of defect sites and oxygen-containing groups. Moreover,the influence of mass oxalic/citric acid ratio and oxidation time of graphite felt cathode were investigated. As a result, H2O2 electrogeneration was 1.6 times as much as that of virgin graphite felt counterpart at themass oxalic/citric acid ratio of 2:1 oxidation for 40 min. However, overoxidation also impaired the electricalproduction of H2O2 due to decarboxylation. Finally, the effect of cathode potential and reaction pHon graphite felt cathode was optimized. As for the modified graphite felt, the maximum accumulationrate of H2O2 reached 4.5 mg h1 cm2 at the conditions of 0.85 V (SCE), 0.4 L min1 O2 flow rate andpH = 3. In addition, it kept a stable performance for electrochemical generation of H2O2 during 8 cycles.