Fast and Stable Electrochemical Production of H2O2by Electrode Architecture Engineering

Wenwen Xu, Zheng Liang, Shun Gong, Baoshan Zhang, Hui Wang, Linfeng Su, Xu Chen, Nana Han, Ziqi Tian, Tanja Kallio, Liang Chen*, Zhiyi Lu, Xiaoming Sun

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Fast and stable production of hydrogen peroxide (H2O2) through electrochemical pathways is crucial for wastewater treatment applications. With this objective, herein, we report an integrated and superaerophilic electrode composed of atomically dispersed Ni-O-C site-enriched carbon nanosheets (IS-NiOC electrode) for electrochemical oxygen reduction to produce H2O2. Both experimental and theoretical results have proven that atomically dispersed Ni-O-C sites enable a low overpotential (260 mV at 0.1 mA cm-2) and high selectivity (>90% at 0.0-0.5 V vs reversible hydrogen electrode (RHE)) in a neutral electrolyte. Compared with a commercial gas-diffusion electrode, the IS-NiOC electrode offers stronger affinity to oxygen bubbles and more robust three-phase contact points, resulting in high current density (∼106 mA cm-2 at 0.25 V vs RHE) and superior stability (∼200 h). These merits allow the application of the IS-NiOC electrode in an electro-Fenton-like process, which enables fast degradation of representative organic pollutants in both a steady state and a flow state.

Original languageEnglish
Pages (from-to)7120-7129
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume9
Issue number20
Early online date11 May 2021
DOIs
Publication statusPublished - 24 May 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • electrocataysis
  • Fenton-like process
  • hydrogen peroxide
  • oxygen reduction reaction
  • superaerophilic electrode

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