A novel cobalt hexacyanoferrate/multi-walled carbon nanotubes nanocomposite: Spontaneous assembly synthesis and application as electrode materials with significantly improved capacitance for supercapacitors

作者：Zhang, Xiaojuan; Tao, Ling; He, Ping^*; Zhang, Xingquan; He, Mingqian; Dong, Faqin; He, Shaoying; Li, Caixia; Liu, Huanhuan; Wang, Shuai; Zhang, Ying

来源：Electrochimica Acta, 2018, 259: 793-802.

DOI：10.1016/j.electacta.2017.11.007

• Cobalt hexacyanoferrate
• Multi-walled carbon nanotubes
• Nanocomposite
• Specific capacitance
• Supercapacitors

Vast improvement of the capacitance of supercapacitors without sacrificing high power density and cycle performance brings bright application prospect. Here, a novel cobalt hexacyanoferrate/multi-walled carbon nanotubes (CoHCF/MWCNTs) nanocomposite is prepared by a simple and facile approach and further investigated as electrode materials for supercapacitors. The physical properties of as-prepared materials are characterized by XRD, FTIR, Raman and FE-SEM techniques. Furthermore, electrochemical performances of as-prepared materials are investigated by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy in 1.0 M Na2SO4 electrolyte. It is shown that as-prepared CoHCF/MWCNTs (25.0 wt% of MWCNTs) nanocomposite based electrode exhibits the best electrochemical performances, including higher specific capacitance/capacity (648.5 F g(-1)/810.6 C g(-1) at 1.4 A g(-1)), good rate capability (648.5 F g(-1)/810.6 C g(-1) and 436.3 F g(-1)/545.3 C g(-1) at 1.4 A g(-1) and 15 A g(-1), respectively) and excellent cycling stability (94.3% capacitance retention after 3000 cycles at 2.0 A g(-1)) in all as-prepared electrodes. The results demonstrate that as-prepared CoHCF/MWCNTs nanocomposite is a promising candidate for electrochemical energy storage.

• 出版日期2018-1-1
• 单位西南科技大学