Citation: ZHOU Yue-Wei, JI Yun-Hui, TAN Chang-Bin, SONG Wei-Jie, XU Liang-Liang, TANG Shao-Chun. Preparation and Electrochemical Properties of NiCo₂S₄@Carbon Nanotube Constructed Flexible Film Electrode for Supercapacitors[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(8): 1419-1426. doi: 10.11862/CJIC.2019.185 shu

Preparation and Electrochemical Properties of NiCo₂S₄@Carbon Nanotube Constructed Flexible Film Electrode for Supercapacitors

1.
College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2.
Nanjing Foreign Language School, Nanjing 210008, China

Corresponding author: TANG Shao-Chun, tangsc@nju.edu.cn
Received Date: 14 April 2019
Revised Date: 11 June 2019

Figures(6)

The NiCo₂S₄@carbon nanotube (CNT) constructed flexible film(NiCo₂S₄@CNTF)electrodes was synthes-ized by a new top-down route using dense and ultrathin carbon nanotube films (CNTF)from floating catalytic chemical vapor deposition as a support. The synthesis included two-step acid treatment of a dense-packed CNTF leading to a three-dimensionally porous conductive matrix, growth of uniformNiCo₂(CO₃)_1.5(OH)₃ precursor on each CNT, followed by solution-based sulfidation. Meanwhile the two-step acid treatment transformed hydrophobic CNTF to be highly hydrophilic, which made its interior to be highly ion-accessible and well-separation of adjacent CNTs in a 3D space, thus assured high loadings. The products were characterized by X-ray diffraction, scanning electron microscopy and other techniques. The results indicatedthat the optimal products were flexible composite filmswith a 3D network structure constructed by NiCo₂S₄ coated CNTs. The NiCo₂S₄ nanoparticle coating was rough with a thickness of~70 nm, which is benefit for providing active sites for electrochemical energy storage. The composite film electrode had a specific capacitance of 270.3 mF·cm^-2 at 0.5 mA·cm^-2, and exhibited excellent cycling stability with 93% of initial capacitance even after 10 000 cycles at a high current density of 2.5 mA·cm^-2. The coulombic efficiency kept at around 92% with fluctuations during the whole cycling. Also, the composite film electrode kept good structure integrity after repeated large deformations. The relationship been the specific nanostructure and electrochemical performance was discussed in detail, and involved mechanism was also revealed.
- composite materials,
- carbon nanotube films,
- flexible electrodes,
- synthesis,
- supercapacitors
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沈阳化工大学材料科学与工程学院沈阳 110142

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Preparation and Electrochemical Properties of NiCo₂S₄@Carbon Nanotube Constructed Flexible Film Electrode for Supercapacitors