Synthesis of silver/nitrogen-doped reduced graphene oxide through a one-step thermal solid-state reaction for oxygen reduction in an alkaline medium

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

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

One of the obstacles to the commercialisation of fuel cells is the high cost of noble metals, such as platinum, that are used as electrocatalysts. Silver-incorporated nitrogen-doped reduced graphene oxide (Ag/N-rGO) has been synthesised through the simple annealing of metal salts with graphene oxide and melamine. The presence of silver and nitrogen atoms in Ag/N-rGO was confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS) analysis. Both the XPS and EDS results showed a higher Ag loading on the N-rGO surface compared with the rGO surface. Transmission electron microscopy (TEM) images revealed a wide size distribution of Ag particles loaded on the N-rGO surface. Electrochemical results indicate that N-rGO is a better support for Ag than rGO. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) results indicate that Ag/N-rGO is a potential ORR catalyst candidate in alkaline as it exhibited an onset potential of -0.15 V vs. Ag/AgCl and a limiting diffusion current density of -4.38 mA cm-2 with four electron pathways. In addition, Ag/N-rGO also showed better methanol tolerance than Pt/C.

Original languageEnglish
Pages (from-to)412-420
Number of pages9
JournalJournal of Power Sources
Volume324
DOIs
Publication statusPublished - 30 Aug 2016

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Graphite
Solid state reactions
Silver
Oxides
Graphene
graphene
Nitrogen
silver
Oxygen
solid state
nitrogen
oxides
Energy dispersive spectroscopy
oxygen
synthesis
X ray photoelectron spectroscopy
photoelectron spectroscopy
melamine
Melamine
commercialization

Keywords

  • Alkaline medium
  • Oxygen reduction
  • Reduced graphene oxide
  • Silver/nitrogen-doped

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Synthesis of silver/nitrogen-doped reduced graphene oxide through a one-step thermal solid-state reaction for oxygen reduction in an alkaline medium. / Soo, Li Ting; Loh, Kee Shyuan; Mohamad, Abu Bakar; Wan Daud, Wan Ramli; Wong, Wai Yin.

In: Journal of Power Sources, Vol. 324, 30.08.2016, p. 412-420.

Research output: Contribution to journalArticle

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AU - Wong, Wai Yin

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