The effect of varying N/C ratios of nitrogen precursors during non-metal graphene catalyst synthesis

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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Nitrogen-doped carbon materials have great potential as metal-free catalysts in a variety of applications, including batteries, supercapacitors and fuel cells. In this paper, nitrogen-doped graphene (NG) catalysts were synthesized via thermal annealing with varying ratios of graphite oxide and melamine precursors. The NG catalysts were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The prepared NG catalysts were folded transparent films with wrinkles. The nitrogen content of the NG catalysts calculated from XPS varied from approximately 4.18%-7.40%. NG1 displayed the highest performance, with a remarkable reduction peak of 0.39 mA cm-2 at -0.21 V vs. Ag/AgCl in alkaline media. A direct correlation between total nitrogen content and catalytic activity was not observed, but catalytic activity was dependent on the nature of the nitrogen configurations. XPS analysis revealed that the high catalytic activity of NG1 is attributable to the configuration of the graphitic N-type nitrogen.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
DOIs
Publication statusAccepted/In press - 26 Oct 2015

Fingerprint

Graphene
graphene
Nitrogen
nitrogen
catalysts
Catalysts
synthesis
catalytic activity
Catalyst activity
X ray photoelectron spectroscopy
photoelectron spectroscopy
Fuel cells
x rays
melamine
Melamine
electrochemical capacitors
configurations
cells
fuel cells
Fourier transform infrared spectroscopy

Keywords

  • Catalytic activity
  • Nitrogen-doped graphene
  • Reduced graphene oxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

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title = "The effect of varying N/C ratios of nitrogen precursors during non-metal graphene catalyst synthesis",
abstract = "Nitrogen-doped carbon materials have great potential as metal-free catalysts in a variety of applications, including batteries, supercapacitors and fuel cells. In this paper, nitrogen-doped graphene (NG) catalysts were synthesized via thermal annealing with varying ratios of graphite oxide and melamine precursors. The NG catalysts were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The prepared NG catalysts were folded transparent films with wrinkles. The nitrogen content of the NG catalysts calculated from XPS varied from approximately 4.18{\%}-7.40{\%}. NG1 displayed the highest performance, with a remarkable reduction peak of 0.39 mA cm-2 at -0.21 V vs. Ag/AgCl in alkaline media. A direct correlation between total nitrogen content and catalytic activity was not observed, but catalytic activity was dependent on the nature of the nitrogen configurations. XPS analysis revealed that the high catalytic activity of NG1 is attributable to the configuration of the graphitic N-type nitrogen.",
keywords = "Catalytic activity, Nitrogen-doped graphene, Reduced graphene oxide",
author = "Soo, {Li Ting} and Loh, {Kee Shyuan} and Mohamad, {Abu Bakar} and {Wan Daud}, {Wan Ramli}",
year = "2015",
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AU - Soo, Li Ting

AU - Loh, Kee Shyuan

AU - Mohamad, Abu Bakar

AU - Wan Daud, Wan Ramli

PY - 2015/10/26

Y1 - 2015/10/26

N2 - Nitrogen-doped carbon materials have great potential as metal-free catalysts in a variety of applications, including batteries, supercapacitors and fuel cells. In this paper, nitrogen-doped graphene (NG) catalysts were synthesized via thermal annealing with varying ratios of graphite oxide and melamine precursors. The NG catalysts were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The prepared NG catalysts were folded transparent films with wrinkles. The nitrogen content of the NG catalysts calculated from XPS varied from approximately 4.18%-7.40%. NG1 displayed the highest performance, with a remarkable reduction peak of 0.39 mA cm-2 at -0.21 V vs. Ag/AgCl in alkaline media. A direct correlation between total nitrogen content and catalytic activity was not observed, but catalytic activity was dependent on the nature of the nitrogen configurations. XPS analysis revealed that the high catalytic activity of NG1 is attributable to the configuration of the graphitic N-type nitrogen.

AB - Nitrogen-doped carbon materials have great potential as metal-free catalysts in a variety of applications, including batteries, supercapacitors and fuel cells. In this paper, nitrogen-doped graphene (NG) catalysts were synthesized via thermal annealing with varying ratios of graphite oxide and melamine precursors. The NG catalysts were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The prepared NG catalysts were folded transparent films with wrinkles. The nitrogen content of the NG catalysts calculated from XPS varied from approximately 4.18%-7.40%. NG1 displayed the highest performance, with a remarkable reduction peak of 0.39 mA cm-2 at -0.21 V vs. Ag/AgCl in alkaline media. A direct correlation between total nitrogen content and catalytic activity was not observed, but catalytic activity was dependent on the nature of the nitrogen configurations. XPS analysis revealed that the high catalytic activity of NG1 is attributable to the configuration of the graphitic N-type nitrogen.

KW - Catalytic activity

KW - Nitrogen-doped graphene

KW - Reduced graphene oxide

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