Self-templated hollow nanospheres of B-site engineered non-stoichiometric perovskite for supercapacitive energy storage via anion-intercalation mechanism

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Sarmad Iqbal
  • Amr Hussein Mady
  • Young Il Kim
  • Umer Javed
  • P. Muhammed Shafi
  • Van Quang Nguyen
  • Dirk Tuma
  • Jae Jin Shim

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)729-739
Number of pages11
Journal / PublicationJournal of Colloid and Interface Science
Volume600
Online published29 Mar 2021
Publication statusPublished - 15 Oct 2021

Abstract

The continual increase in energy demand and inconsistent supply have attracted attention towards sustainable energy storage/conversion devices, such as electrochemical capacitors with high energy densities and power densities. Perovskite oxides have received significant attention as anion-intercalation electrode materials for electrochemical capacitors. In this study, hollow nanospheres of non-stoichiometric cubic perovskite fluorides, KNi1−xCoxF3−δ (x = 0.2; δ = 0.33) (KNCF-0.2) have been synthesized using a localized Ostwald ripening. The electrochemical performance of the non-stoichiometric perovskite has been studied in an aqueous 3 M KOH electrolyte to categorically investigate the fluorine-vacancy-mediated charge storage capabilities. High capacities up to 198.55 mA h g−1 or 714.8 C g−1 (equivalent to 1435 F g−1) have been obtained through oxygen anion-intercalation mechanism (peroxide pathway, O-). The results have been validated using ICP (inductively coupled plasma mass spectrometry) analysis and cyclic voltammetry. An asymmetric supercapacitor device has been fabricated by coupling KNCF-0.2 with activated carbon to deliver a high energy density of 40 W h kg−1 as well as excellent cycling stability of 98% for 10,000 cycles. The special attributes of hollow-spherical, non-stoichiometric perovskite (KNCF-0.2) have exhibited immense promise for their usability as anion-intercalation type electrodes in supercapacitors.

Research Area(s)

  • Anion-intercalation, Hollow nanospheres, Non-stoichiometric perovskite, Ostwald ripening, Peroxide pathway, Supercapacitor

Citation Format(s)

Self-templated hollow nanospheres of B-site engineered non-stoichiometric perovskite for supercapacitive energy storage via anion-intercalation mechanism. / Iqbal, Sarmad; Mady, Amr Hussein; Kim, Young Il; Javed, Umer; Shafi, P. Muhammed; Nguyen, Van Quang; Hussain, Iftikhar; Tuma, Dirk; Shim, Jae Jin.

In: Journal of Colloid and Interface Science, Vol. 600, 15.10.2021, p. 729-739.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review