NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

Ruiqi Wang, Chuan Xia, Nini Wei, Husam N. Alshareef*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Ternary transition metal oxides such as NiCo2O4 show great potential as supercapacitor electrode materials. However, the unsatisfactory rate performance of NiCo2O4 may prove to be a major hurdle to its commercial usage. Herein, we report the development of NiCo2O4@TiN core-shell nanostructures for all-solid-state supercapacitors with significantly enhanced rate capability. We demonstrate that a thin layer of TiN conformally grown by atomic layer deposition (ALD) on NiCo2O4 nanofiber arrays plays a key role in improving their electrical conductivity, mechanical stability, and rate performance. Fabricated using the hybrid NiCo2O4@TiN electrodes, the symmetric all-solid-state supercapacitor exhibited an impressive stack power density of 58.205 mW cm-3 at a stack energy density of 0.061 mWh cm-3. To the best of our knowledge, these values are the highest of any NiCo2O4-based all-solid-state supercapacitor reported. Additionally, the resulting NiCo2O4@TiN all-solid-state device displayed outstanding cycling stability by retaining 70% of its original capacitance after 20,000 cycles at a high current density of 10 mA cm-2. These results illustrate the promise of ALD-assisted hybrid NiCo2O4@TiN electrodes within sustainable and integrated energy storage applications.

Original languageEnglish (US)
Pages (from-to)611-621
Number of pages11
JournalElectrochimica Acta
Volume196
DOIs
StatePublished - Apr 1 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.

Keywords

  • All-solid-state
  • Atomic layer deposition (ALD)
  • Core-shell
  • Supercapacitor
  • Titanium nitride (TiN)

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry

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