Nitrogen-doped carbon xerogels catalyst for oxygen reduction reaction: Improved structural and catalytic activity by enhancing nitrogen species and cobalt insertion

Azim Fitri Zainul Abidin, Kee Shyuan Loh, Wai Yin Wong, Abu Bakar Mohamad

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Highly active nitrogen-doped carbon xerogel (N-CX) electrocatalysts for the oxygen reduction reaction (ORR) were synthesized through a simple sol-gel method. The N-CX samples are prepared using resorcinol – formaldehyde resin as the carbon precursor and dicyandiamide as the nitrogen precursor. The N-CX samples carbonized at different temperatures are inspected to interpret the effect of the high-temperature conditions towards the structures and ORR activity of the final products. As-prepared N-CX samples with different carbonized temperatures are characterized via X-ray photoelectron spectroscopy (XPS), X-ray diffractometry and Raman spectroscopy. The N-CX sample carbonized at 800 °C demonstrated the greatest ORR activity, and the structural properties and catalytic activities of the catalyst are then further improved by insertion of cobalt metal under an ammonia atmosphere. Metal doping evidently promotes the catalytic activity of the N-CX catalyst. Raman and XPS studies show that cobalt increases the creation of pyridinic-N and quaternary-N groups through the formation of more graphitic structures. The ammonia atmosphere is demonstrated to act as an additional N source by increasing the total N content in the carbon structure after high temperature treatment of the N-CX catalyst. Metal-N-like and metal carbide configurations generated play a role in catalyst production with high catalytic activity.

Original languageEnglish
Pages (from-to)28789-28802
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number54
DOIs
Publication statusPublished - 5 Nov 2019

Fingerprint

Xerogels
xerogels
catalytic activity
insertion
Cobalt
Catalyst activity
cobalt
Nitrogen
nitrogen
catalysts
Catalysts
Carbon
Oxygen
carbon
oxygen
Metals
metals
ammonia
Ammonia
X ray photoelectron spectroscopy

Keywords

  • Carbon xerogel
  • Catalyst
  • Nitrogen doping
  • Oxygen reduction reaction

ASJC Scopus subject areas

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

Cite this

Nitrogen-doped carbon xerogels catalyst for oxygen reduction reaction : Improved structural and catalytic activity by enhancing nitrogen species and cobalt insertion. / Zainul Abidin, Azim Fitri; Loh, Kee Shyuan; Wong, Wai Yin; Mohamad, Abu Bakar.

In: International Journal of Hydrogen Energy, Vol. 44, No. 54, 05.11.2019, p. 28789-28802.

Research output: Contribution to journalArticle

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