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

Wei Wang, Xiaoye Lu, Pei Su, Yawei Li, Jingju Cai, Qizhan Zhang, Minghua Zhou, Omotayo Arotiba

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number127423
JournalChemosphere
Volume259
DOIs
Publication statusPublished - Nov 2020

Keywords

  • Electrochemical performance
  • F doped carbon nanotube
  • Gas diffusion electrode
  • Hydrogen peroxide production

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • General Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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