Enhancement of hydrogen peroxide production by electrochemical reduction of oxygen on carbon nanotubes modified with fluorine

被引:63
作者
Wang, Wei [1 ,2 ,3 ,4 ]
Lu, Xiaoye [1 ,2 ,3 ,4 ]
Su, Pei [1 ,2 ,3 ,4 ]
Li, Yawei [1 ,2 ,3 ,4 ]
Cai, Jingju [1 ,2 ,4 ]
Zhang, Qizhan [1 ,2 ,3 ,4 ]
Zhou, Minghua [1 ,2 ,3 ,4 ]
Arotiba, Omotayo [5 ]
机构
[1] Nankai Univ, Coll Environm Sci & Engn, Key Lab Pollut Proc & Environm Criteria, Minist Educ, Tianjin 300350, Peoples R China
[2] Nankai Univ, Tianjin Key Lab Environm Technol Complex Trans Me, Tianjin 300350, Peoples R China
[3] Nankai Univ, Coll Environm Sci & Engn, Tianjin Key Lab Urban Ecol Environm Remediat & Po, Tianjin 300350, Peoples R China
[4] Nankai Univ, Coll Environm Sci & Engn, Tianjin Adv Water Treatment Technol Int Joint Res, Tianjin 300350, Peoples R China
[5] Univ Johannesburg, Dept Appl Chem, Doornfontein, South Africa
基金
中国国家自然科学基金;
关键词
F doped carbon nanotube; Gas diffusion electrode; Electrochemical performance; Hydrogen peroxide production; ELECTRO-FENTON DEGRADATION; ACTIVATED CARBON; DIFFUSION CATHODE; H2O2; PRODUCTION; DOPED GRAPHENE; FELT CATHODE; GENERATION; ELECTROGENERATION; MINERALIZATION; CATALYST;
D O I
10.1016/j.chemosphere.2020.127423
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
It is vital to synthesis hydrogen peroxide via electrochemical reduction of oxygen since it is a green process to produce oxidant with wide applications including water/wastewater treatment. In this work, fluorine (F) was employed to modify carbon nanotube (CNT), and the obtained F doped CNT (F-CNT) catalyst was used to fabricate gas diffusion electrode (GDE). It was found that F doping could improve oxygen reduction activity and H2O2 selectivity, and then enhanced the H2O2 production. After modification, F-CNT prepared with 0.6 M HF (CNT-F-0.6) had much higher H2O2 production (47.6 mg L-1) and current efficiency (89.5%) than that of CNT (29.6 mg L-1, 70.1%) at bias voltage of -1.3 V (vs SCE) and pH 7. Moreover, the high catalytic activity of CNT-F-0.6 could maintain in 5 consecutive reaction cycles. The material characterization and electrochemical test indicated that F doping had no significant effects on the surface area of CNT, but improved the defect degree of CNT. The enhanced H2O2 production performance could be ascribed to the formation of CF2 and CF3 on the surface of F-doped CNT, which rendered the potential for practical application of novel carbon catalyst for GDE. (C) 2020 Elsevier Ltd. All rights reserved.
引用
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页数:8
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