Co2(OH)3Cl xerogels with 3D interconnected mesoporous structures as a novel high-performance supercapacitor material

S. Ranganatha, Surender Kumar, Tirupathi Rao Penki, Brij Kishore, N. Munichandraiah

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Co2(OH)3Cl xerogel interconnected mesoporous structures have been prepared by a facile one pot sol-gel process and heat treated at 200 and 400 °C. All samples are studied for their morphology, structure, and electrochemical stability upon cycling. The specific capacitance of the as-prepared Co2(OH)3Cl from single electrode study is 450 F/g, when the electrodes are cycled in 3 M KOH at a specific current 2 A/g. Interestingly, capacity retention after 500 and 1000 cycles is about 92 and 75 %, respectively. Sample heated at 200 °C exhibits 308 F/g at 2 A/g and that heated at 400 °C shows only 32 F/g at 0.2 A/g. With an increase in preparation temperature, amorphous Co2(OH)3Cl is converted to crystalline Co3O4 phases with lower electrochemical performance. In full cell study, as-prepared Co2(OH)3Cl showed a capacity of about 49 F/g as asymmetric capacitor and 32 F/g as symmetric capacitor at 2 A/g current density. Co2(OH)3Cl being a novel porous material with merits of homogeneous porosity, high surface area, and an interconnected three dimensional (3D) structure exhibits considerably high capacitance. With a significant specific capacity and electrochemical stability, the synthesized material is a novel potential candidate for supercapacitors. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)133-143
Number of pages11
JournalJournal of Solid State Electrochemistry
Volume21
Issue number1
DOIs
StatePublished - 1 Jan 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016, Springer-Verlag Berlin Heidelberg.

Keywords

  • Cobalt hydroxychlorides
  • Mesoporous
  • Sol-gel
  • Supercapacitors
  • Xerogel

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