Capacitance performance of cobalt hydroxide-based capacitors with utilization of near-neutral electrolytes

Fedor S. Fedorov, Julia Linnemann, Kristina Tschulik, Lars Giebeler, Margitta Uhlemann, Annett Gebert

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Conventional alkaline solutions used for capacitive performance of electrodeposited cobalt hydroxides have a number of disadvantages as they are corrosive, environmentally unfriendly and provide a small working potential range. In this study, the capacitive properties of electrodeposited cobalt hydroxide/oxide were investigated in 1 M Na2SO4 solution with pH 5.5 by means of cyclic voltammetry, galvanostatic charging/discharging experiments and electrochemical impedance spectroscopy. The capacitance of the cobalt hydroxide/oxide was demonstrated to have high values of 141 F g -1 at scan rate 8 mV s-1 in this 1 M Na2SO 4 solution. The anodic potential range is extended by 0.8-1.3 V vs. Ag/AgCl. A good cyclic stability and reversibility were observed.

Original languageEnglish
Pages (from-to)166-170
Number of pages5
JournalElectrochimica Acta
Volume90
DOIs
Publication statusPublished - 15 Feb 2013
Externally publishedYes

Keywords

  • Cobalt hydroxide
  • Differential capacitance
  • Integral capacitance
  • Neutral electrolyte
  • Supercapacitor

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