Effect of nitrogen precursors on the electrochemical performance of nitrogen-doped reduced graphene oxide towards oxygen reduction reaction

Li Ting Soo, Kee Shyuan Loh, Abu Bakar Mohamad, Wan Ramli Wan Daud, Wai Yin Wong

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A series of nitrogen-doped reduced graphene oxides (NGs) with different ratios are synthesized by thermal annealing of graphene oxide with melamine or urea. The total nitrogen content in NG is high, with values of up to 5.88 at.%. The NG samples prepared by melamine exhibited thin transparent graphene sheets structure, with consist of higher nitrogen doping level and quaternary N content compared to those NG samples prepared from urea. Electrochemical characterizations show that NG is a promising metal-free electrocatalyst for an oxygen reduction reaction (ORR). Incorporation of nitrogen atoms into graphene basal plane can enhances its electrocatalytic activity toward ORR in alkaline media. The onset potential and mean number of electron transfers on NG 1 are -0.10 V and 3.80 respectively, which is higher than that of reduced graphene oxide (-0.15 V, 3.52). This study suggests that quaternary-N of the NG samples is the active site which determines the ORR activity Moreover, the NG samples with the transparent layer of graphene-like structure have better ORR performances than that of bulk graphite-like NG samples.

Original languageEnglish
Pages (from-to)112-120
Number of pages9
JournalJournal of Alloys and Compounds
Volume677
DOIs
Publication statusPublished - 25 Aug 2016

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Oxides
Graphene
Nitrogen
Oxygen
Melamine
Urea
Electrocatalysts
Doping (additives)
Annealing
Metals
Atoms
Electrons

Keywords

  • Nitrogen-doped
  • Oxygen reduction reaction
  • Reduced graphene oxide
  • Thermal annealing

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Effect of nitrogen precursors on the electrochemical performance of nitrogen-doped reduced graphene oxide towards oxygen reduction reaction. / Soo, Li Ting; Loh, Kee Shyuan; Mohamad, Abu Bakar; Wan Daud, Wan Ramli; Wong, Wai Yin.

In: Journal of Alloys and Compounds, Vol. 677, 25.08.2016, p. 112-120.

Research output: Contribution to journalArticle

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AU - Wong, Wai Yin

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