Al-substituted α-cobalt hydroxide synthesized by potentiostatic deposition method as an electrode material for redox-supercapacitors

Vinay Gupta, Shubhra Gupta, Norio Miura

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

Al-substituted α-cobalt hydroxide was prepared by a potentiostatic deposition process at -1.0 V (vs. Ag/AgCl) onto stainless steel electrodes by using a mixed aqueous solution of cobalt nitrate and aluminum nitrate. Their structure and surface morphology were studied by using X-ray diffraction analysis, energy dispersive X-ray spectroscopy and scanning electron microscopy. The SEM images showed changes in the nanostructure of α-cobalt hydroxide by the addition of Al. Galvanostatic charge-discharge curves showed a drastic improvement in the capacitive characteristics of α-cobalt hydroxide, with a specific energy increase from 11.3 to 18.7 Wh kg-1 by the substitution of just 8 at.% Al, and a specific capacitance of 843 F g-1 between 0 and 0.4 V. The cycle stability data suggest no significant changes in the discharge characteristics of α-cobalt hydroxide by the addition of Al.

Original languageBritish English
Pages (from-to)685-689
Number of pages5
JournalJournal of Power Sources
Volume177
Issue number2
DOIs
StatePublished - 1 Mar 2008

Keywords

  • Aluminum hydroxide
  • Cobalt hydroxide
  • Potentiostatic deposition
  • Specific capacitance
  • Supercapacitor

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