화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.108, 466-475, April, 2022
DOI10.1016/j.jiec.2022.01.027  Export Citation
High-effective generation of H2O2 by oxygen reduction utilizing organic acid anodized graphite felt as cathode
Hongkai Guo, Hu Xu, Chengwen Zhao, Xiangzhong Hao1, Ziyuan Yang1, and Weijun Xu†
  • School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
  • 1Gansu HaoShi Carbon Fiber Co., LTD, Baiyin 730900, Gansu, China
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Achieving high catalytic performance with the lowest cost possible cathode material is critical for electrocatalytic synthesis of H2O2 by oxygen reduction reaction. In this work, we describe a method of preparing highly active yet stable graphite felt electrocatalysts containing ultrahigh-loading oxygen content by using organic acid anodic modification. The results show that modified graphite felt surface was more 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 the mass oxalic/citric acid ratio of 2:1 oxidation for 40 min. However, overoxidation also impaired the electrical production of H2O2 due to decarboxylation. Finally, the effect of cathode potential and reaction pH on graphite felt cathode was optimized. As for the modified graphite felt, the maximum accumulation rate of H2O2 reached 4.5 mg h-1 cm-2 at the conditions of - 0.85 V (SCE), 0.4 - min-1 O2 flow rate and pH = 3. In addition, it kept a stable performance for electrochemical generation of H2O2 during 8 cycles.
Keywords:Organic acid anodic modification;Graphite felt;H2O2 electrocatalytic synthesis;Oxygen reduction;Oxygen-containing group
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