title: Highly effective synthesis of NiO/CNT nanohybrids by atomic layer deposition for high-rate and long-life supercapacitors.
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.
authors.affiliation: State Key Lab of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Lei
authors.initials: L
authors.lastname: Yu
authors.forename: Guilong
authors.initials: G
authors.lastname: Wang
authors.forename: Gengping
authors.initials: G
authors.lastname: Wan
authors.forename: Guizhen
authors.initials: G
authors.lastname: Wang
authors.forename: Shiwei
authors.initials: S
authors.lastname: Lin
authors.forename: Xinyue
authors.initials: X
authors.lastname: Li
authors.forename: Kan
authors.initials: K
authors.lastname: Wang
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Bai
authors.forename: Yang
authors.initials: Y
authors.lastname: Xiang