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 language | English (US) |
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Pages (from-to) | 611-621 |
Number of pages | 11 |
Journal | Electrochimica Acta |
Volume | 196 |
DOIs | |
State | Published - 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