The physicochemical/electrochemical properties of binary Ni-Co oxides

Chi Chang Hu, Yuh Shu Lee, Ten-Chin Wen

Research output: Contribution to journalArticle

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Abstract

The voltammetric behavior of Ni-Co oxides fabricated by thermal decomposition as well as their activities for the oxygen evolution reaction (OER) are examined by cyclic voltammetry (CV) and log i-E curves (Tafel study) in alkaline media. The reversibility of Co(IV)/Co(III) and Tafel slope of the OER are found to depend on the crystalline structure and composition/surface morphology of these binary oxides performed by X-ray diffraction, energy-dispersive spectrometry and scanning electron microscopy, respectively. A combination of the electrochemical and textural investigations reveals that NiO, NiCo2O4 and Co3O4 predominate the electrochemical behavior of Ni-Co oxides with Ni composition (i) above 80 m/o, (ii) between 60/70 and 20 m/o and (iii) below 20 m/o, respectively. The intimate mixing of NiO and NiCo2O4 with ca. 50 m/o Ni, rendering an increase in the nonstoichiometric sites, exerts a synergistic effect for the OER.

Original languageEnglish
Pages (from-to)246-254
Number of pages9
JournalMaterials Chemistry and Physics
Volume48
Issue number3
DOIs
Publication statusPublished - 1997 May 15

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Electrochemical properties
Oxides
Oxygen
oxides
oxygen
Chemical analysis
Spectrometry
Cyclic voltammetry
thermal decomposition
Surface morphology
Pyrolysis
slopes
Crystalline materials
X ray diffraction
Scanning electron microscopy
scanning electron microscopy
curves
diffraction
spectroscopy
x rays

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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The physicochemical/electrochemical properties of binary Ni-Co oxides. / Hu, Chi Chang; Lee, Yuh Shu; Wen, Ten-Chin.

In: Materials Chemistry and Physics, Vol. 48, No. 3, 15.05.1997, p. 246-254.

Research output: Contribution to journalArticle

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