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Issue 35, 2016

Highly effective synthesis of NiO/CNT nanohybrids by atomic layer deposition for high-rate and long-life supercapacitors

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Abstract

In this work, we report an atomic layer deposition (ALD) method for the fabrication of NiO/CNT hybrid structures in order to improve electronic conductivity, enhance cycling stability and increase rate capability of NiO used as supercapacitor electrodes. A uniform NiO coating can be well deposited on carbon nanotubes (CNTs) through simultaneously employing O3 and H2O as oxidizing agents in a single ALD cycle of NiO for the first time, with a high growth rate of nearly 0.3 Å per cycle. The electrochemical properties of the as-prepared NiO/CNT were then investigated. The results show that the electrochemical capacitive properties are strongly associated with the thickness of the NiO coating. The NiO/CNT composite materials with 200 cycles of NiO deposition exhibit the best electrochemical properties, involving high specific capacitance (622 F g−1 at 2 A g−1, 2013 F g−1 for NiO), excellent rate capability (74% retained at 50 A g−1) and outstanding cycling stability. The impressive results presented here suggest a great potential for the fabrication of composite electrode materials by atomic layer deposition applied in high energy density storage systems.

Graphical abstract: Highly effective synthesis of NiO/CNT nanohybrids by atomic layer deposition for high-rate and long-life supercapacitors

Supplementary files

Article information


Submitted
15 May 2016
Accepted
22 Jul 2016
First published
25 Jul 2016

Dalton Trans., 2016,45, 13779-13786
Article type
Paper

Highly effective synthesis of NiO/CNT nanohybrids by atomic layer deposition for high-rate and long-life supercapacitors

L. Yu, G. Wang, G. Wan, G. Wang, S. Lin, X. Li, K. Wang, Z. Bai and Y. Xiang, Dalton Trans., 2016, 45, 13779 DOI: 10.1039/C6DT01927G

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