Cobalt oxide as photocatalyst for water splitting: Temperature-dependent phase structures

Siti Nurul Falaein Moridon, Mohd Ikhmal Salehmin, Mohamad Azuwa Mohamed, Arifin Khuzaimah, Lorna Effery Minggu, Mohammad Kassim

Research output: Contribution to journalArticle

Abstract

This study investigated the best phases of cobalt oxide for the photochemical and photoelectrochemical (PEC) water-splitting reaction. Cobalt oxide was produced via a hydrothermal process of cobalt nitrate hexahydrate and then annealed at different temperatures from 450 °C to 950 °C. The Co3O4 phase was produced during pre-annealing and annealing at 450 °C. The mixed phase of Co3O4 and CoO was produced during annealing at 550 °C and 650 °C, and pure CoO was produced during annealing from 750 °C to 950 °C. The Co3O4 phase produced the highest photocurrent density with a value of 1.15 mA cm−2 at a −0.4 V potential bias vs. Ag/AgCl. This value two times higher than that reported by other researchers at the same potential bias. Furthermore, the highest rate of hydrogen collected by Co3O4 was ~272.6 μmol h−1 g−1 after 8 h photocatalytic process. The amount of collected hydrogen was stable until 12 h of the process.

Original languageEnglish
Pages (from-to)25495-25504
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number47
DOIs
Publication statusPublished - 4 Oct 2019

Fingerprint

water splitting
cobalt oxides
Phase structure
Photocatalysts
Cobalt
Annealing
annealing
Oxides
Water
Hydrogen
Temperature
temperature
hydrogen
Photocurrents
photocurrents
nitrates
Nitrates
cobalt

Keywords

  • Cobalt oxide
  • Hydrogen
  • PEC
  • Photocatalyst
  • Temperature-dependent

ASJC Scopus subject areas

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

Cite this

Cobalt oxide as photocatalyst for water splitting : Temperature-dependent phase structures. / Moridon, Siti Nurul Falaein; Salehmin, Mohd Ikhmal; Mohamed, Mohamad Azuwa; Khuzaimah, Arifin; Effery Minggu, Lorna; Kassim, Mohammad.

In: International Journal of Hydrogen Energy, Vol. 44, No. 47, 04.10.2019, p. 25495-25504.

Research output: Contribution to journalArticle

Moridon, Siti Nurul Falaein ; Salehmin, Mohd Ikhmal ; Mohamed, Mohamad Azuwa ; Khuzaimah, Arifin ; Effery Minggu, Lorna ; Kassim, Mohammad. / Cobalt oxide as photocatalyst for water splitting : Temperature-dependent phase structures. In: International Journal of Hydrogen Energy. 2019 ; Vol. 44, No. 47. pp. 25495-25504.
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