Efficient supercapattery behavior of mesoporous hydrous and anhydrous cobalt molybdate nanostructures

Byung Chul Kim, Ramu Manikandan, Kook Hyun Yu, Myung Soo Park, Dong Won Kim, Sang Yeup Park, C. Justin Raj

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Hydrous forms of cobalt molybdate binary metal oxide nanoaggregates were synthesized via a simple chemical co-precipitation technique. The subsequent heat treatment at 400 °C converted the sample into anhydrous cobalt molybdate (CoMoO4) with mesoporous nanostructure. The anhydrous cobalt molybdate possess surface area and pore volume of 63.92 m2g-1 and 0.1802 cm3g-1 which is much higher than the hydrous cobalt molybdate (1.215 m2g-1 and 0.0072 cm3 g−1). The electrodes designed using these materials exhibited a battery-like behavior with maximum specific capacity of 97 Cg-1 and 177 Cg-1 for hydrous and anhydrous cobalt molybdate samples respectively. In addition, a supercapattery was fabricated utilizing anhydrous cobalt molybdate//activated carbon electrodes, which showed maximum specific capacity value of 64 Cg-1 at 1 Ag-1 discharge specific current and showed better specific energy ∼18.89 Whkg−1 for a specific power of 1.06 kWkg−1. Moreover, the supercapattery exhibited good capacity retention ∼93% after 5000 charge/discharge cycles.

Original languageEnglish
Pages (from-to)256-265
Number of pages10
JournalJournal of Alloys and Compounds
Volume789
DOIs
StatePublished - 2019 Jun 15

Keywords

  • Cobalt molybdate
  • Impedance spectroscopy
  • Metal oxide
  • Supercapattery

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