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Preparation and Electrochemical Properties of NiCo2S4@Carbon Nanotube Constructed Flexible Film Electrode for Supercapacitors
Author NameAffiliationE-mail
ZHOU Yue-Wei College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
Nanjing Foreign Language School, Nanjing 210008, China 		 
JI Yun-Hui College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China  
TAN Chang-Bin College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China  
SONG Wei-Jie College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China  
XU Liang-Liang Nanjing Foreign Language School, Nanjing 210008, China  
TANG Shao-Chun College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China tangsc@nju.edu.cn 
Abstract: 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.
Keywords: composite materials  carbon nanotube films  flexible electrodes  synthesis  supercapacitors
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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.
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Chinese Journal of Inorganic Chemistry