Electrocatalytic transformation of oxygen to hydroxyl radicals via three-electron pathway using nitrogen-doped carbon nanotube-encapsulated nickel nanocatalysts for effective organic decontamination

Mohua Li, Liang Bai, Shengtao Jiang, Mika Sillanpää, Yingping Huang, Yanbiao Liu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The selective electrochemical reduction of oxygen (O2) via 3e pathway for the production of hydroxyl radicals (HO) is a promising alternative to conventional electro-Fenton process. Here, we developed a nitrogen-doped CNT-encapsulated Ni nanoparticle electrocatalyst (Ni@N-CNT) with high O2 reduction selectivity for the generation of HO via 3e pathway. Exposed graphitized N on the CNT shell, and Ni nanoparticles encapsulated within the tip of the N-CNT, played a key role in the generation of H2O2 intermediate (*HOOH) via a 2e oxygen reduction reaction. Meanwhile, those encapsulated Ni nanoparticles at the tip of the N-CNT facilitated the sequential HO generation by directly decomposing the electrogenerated *H2O2 in a 1e reduction reaction on the N-CNT shell without inducing Fenton reaction. Improved bisphenol A (BPA) degradation efficiency were observed when compared with conventional batch system (97.5% vs 66.4%). Trials using Ni@N-CNT in a flow-through configuration demonstrated a complete removal of BPA within 30 min (k = 0.12 min−1) with a limited energy consumption of 0.068 kW·h·g−1 TOC.

Original languageEnglish
Article number131352
JournalJournal of Hazardous Materials
Volume452
DOIs
Publication statusPublished - 15 Jun 2023

Keywords

  • Electrocatalytic
  • Hydroxyl radical
  • Metal-organic frameworks
  • Oxygen reduction reaction
  • Selectivity

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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