Issue 5, 2022

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

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.

Graphical abstract: 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

Supplementary files

Article information

Article type
Paper
Submitted
24 дек. 2021
Accepted
23 мар. 2022
First published
30 мар. 2022

Environ. Sci.: Nano, 2022,9, 1662-1674

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

E. Yun, W. Lee, Y. Ahn, J. Choi, J. D. Fortner, K. Cho, S. Hong and J. Lee, Environ. Sci.: Nano, 2022, 9, 1662 DOI: 10.1039/D1EN01188J

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