Dual role of N-doped graphene film as a cathode material for anodic organic oxidation and persulfate production and as a planar carbocatalyst for non-electrochemical persulfate activation

Eun Tae Yun, Woonghee Lee, Yong Yoon Ahn, Jaemin Choi, John D. Fortner, Kangwoo Cho, Seungkwan Hong, Jaesang Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, a large-area N-doped graphene film (NG/NF) was fabricated on a nickel foam (NF) substrate via thermal chemical vapor deposition along with the flow of gaseous C2H4/NH3 mixtures. It was demonstrated to enable the sequential process of anodic organic oxidation followed by non-electrochemical activation of anodically formed persulfate. NG-20/NF exhibited the highest electrical conductivity owing to the presence of a pyridinic-N dopant. It thus substantially outperformed the undoped graphene film (G/NF) and NF in initiating anodic oxidation reactions, that is, oxidative organic degradation and conversion of SO42− into persulfate. NG-20/NF performed non-radical persulfate activation, achieving constant treatment efficiency, regardless of whether electric current was applied. A marginal reduction in treatment performance occurred in the electrochemical system using NG/NF during recurring cycles of separate switch-on and -off periods. Accordingly, the dual role of NG/NF as the cathode in paired redox reactions and as the carbocatalyst in persulfate activation was shown.

Original languageEnglish
JournalEnvironmental Science: Nano
DOIs
Publication statusAccepted/In press - 2022

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Environmental Science(all)

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