Ionothermal carbonization of biomass to construct sp2/sp3 carbon interface in N-doped biochar as efficient oxygen reduction electrocatalysts

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

22 Scopus Citations
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Author(s)

  • Lin-Lin Ma
  • Wu-Jun Liu
  • Xiao Hu
  • Paul K.S. Lam
  • Jianxiong Raymond Zeng
  • And 1 others
  • Han-Qing Yu

Detail(s)

Original languageEnglish
Article number125969
Number of pages9
Journal / PublicationChemical Engineering Journal
Volume400
Online published20 Jun 2020
Publication statusPublished - 15 Nov 2020

Abstract

The oxygen reduction reaction (ORR) is critical to various energy conversion and storage systems. Developing cost-effective and high performance metal-free carbon as an alternative to Pt-based ORR electrocatalytsts is a promising strategy for the commercialization of these clean energy conversion technologies. In this work, the microalgae biomass with a high N content was used as a precursor to prepare N-doped biochar material via an ionic liquid-assisted carbonization process. Experimental results show that the sp2/sp3 carbon interface and pore structure of the as-synthesized biochar material could be tuned by the polymerization of the ionic liquids and the catalysis of Fe species in the carbonization process. The as-synthesized N-doped biochar material exhibited robust electrocatalytic ORR performance with a high catalytic activity, excellent long-term stability and great tolerance to methanol and CO. The pyridinic N species was identified as the active catalytic site for the ORR. A Zn-air battery was assembled using the N-doped biochar as the air cathode catalyst and showed favourable performance. This work provides a straightforward strategy to prepare efficient and low-cost functional carbon materials for clean energy conversion from naturally abundant biomass.

Research Area(s)

  • Biomass, N-doped biochar, Oxygen reduction reaction, Sp2/sp3 carbon interface, Zn-Air battery

Citation Format(s)

Ionothermal carbonization of biomass to construct sp2/sp3 carbon interface in N-doped biochar as efficient oxygen reduction electrocatalysts. / Ma, Lin-Lin; Liu, Wu-Jun; Hu, Xiao; Lam, Paul K.S.; Zeng, Jianxiong Raymond; Yu, Han-Qing.

In: Chemical Engineering Journal, Vol. 400, 125969, 15.11.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review