Effect of carbon precursor and initial pH on cobalt-doped carbon xerogel for oxygen reduction

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, cobalt-doped carbon xerogel (Co-CX) was synthesised via sol-gel polymerisation of phenolic compounds (i.e., resorcinol, phenol and m-cresol) and formaldehyde, and this polymerisation was catalysed by cobalt nitrate and followed by a carbonisation process. The effect of the initial pH value (5.5, 6.5 and 7.5) as well as the type of carbon precursors on the structural properties of Co-CX was investigated via field emission scanning electron microscope (FESEM), Brunauer-Emmett-Teller (BET) and X-ray diffractometry (XRD). The catalytic activity of Co-CX for the oxygen reduction reaction (ORR) in 0.1 M KOH was studied using a rotating ring-disk electrode (RRDE) technique. The structural properties and ORR activities were affected by different initial pH values as well as the type of carbon precursor. A carbon precursor consisting of resorcinol-formaldehyde with an initial pH value of 7.5 exhibited the best catalytic activity. The initial pH plays an important role in promoting micro/mesopores. The FESEM and BET results revealed that Co doping promotes the formation of additional pores. The RRDE result indicated that Co-CX exhibited good catalytic activity that tends to favour a four-electron pathway.

Original languageEnglish
Pages (from-to)11047-11055
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume43
Issue number24
DOIs
Publication statusPublished - 14 Jun 2018

Fingerprint

Xerogels
xerogels
Cobalt
cobalt
Carbon
Oxygen
carbon
oxygen
catalytic activity
Catalyst activity
formaldehyde
Formaldehyde
Field emission
Structural properties
field emission
Electron microscopes
polymerization
electron microscopes
Polymerization
Scanning

Keywords

  • Carbon xerogel
  • Catalyst
  • Cobalt 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

Effect of carbon precursor and initial pH on cobalt-doped carbon xerogel for oxygen reduction. / Zainul Abidin, Azim Fitri; Loh, Kee Shyuan; Wong, Wai Yin; Mohamad, Abu Bakar; Puspasari, Ifa.

In: International Journal of Hydrogen Energy, Vol. 43, No. 24, 14.06.2018, p. 11047-11055.

Research output: Contribution to journalArticle

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