Synthesis of Carbon-Based Spinel NiCo2O4 Nanocomposite and Its Application as an Electrochemical Capacitor

被引:13
作者
Shahraki, Mohammad [1 ]
Elyasi, Saeed [2 ]
Heydari, Hamid [3 ]
Dalir, Nima [4 ]
机构
[1] Univ Sistan & Baluchestan, Dept Chem, Fac Sci, Zahedan, Iran
[2] Sharif Univ Technol, Dept Chem Engn, Tehran, Iran
[3] Razi Univ, Dept Chem, Fac Sci, POB 71496 7346, Kermanshah, Iran
[4] Tarbiat Modares Univ, Dept Phys Chem, Fac Sci, POB 14115-175, Tehran, Iran
关键词
Spinel nickel cobaltite; electrical properties; specific capacity; supercapacitor; HIGH-PERFORMANCE SUPERCAPACITORS; ENERGY-STORAGE; ELECTRODE MATERIALS; GRAPHENE; NANOPARTICLES; POLYPYRROLE; NANOTUBES; COMPOSITES; DENSITY; SPHERES;
D O I
10.1007/s11664-017-5490-0
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this study, a thermal method was used to synthesize spinel NiCo2O4 and carbon nanotubes (CNTs)@NiCo2O4 with an average size 50 nm and 20 nm, respectively. Addition of CNTs into NiCo2O4 noticeably increases the active surface area compared to pure spinel NiCo2O4. SEM analyses showed that the morphologies are spherical in both pure and composite samples. Uniform CNTs@NiCo2O4 nanoparticles exhibit high specific capacitance of 210 F g(-1) at 2 A g(-1) and a good retention capacity of 92.70% after 2500 cycles, which shows a considerable improvement compared to NiCo2O4. Additionally, an exceptional rate capability of about 73.2% was obtained at 50 A g(-1). Such remarkable electrochemical performance of the CNTs@NiCo2O4 can be attributed to high specific surface area and also uniform structure which increase the exposure of active sites available for reaction on the surface shortened transport pathways for both electrons and ion. Also, volume change during the charge-discharge process is mainly alleviated compared to pure spinel NiCo2O4. A carbonaceous material such as the CNT facilitates the charge transfer and improves the stability of frame against volume change.
引用
收藏
页码:4948 / 4954
页数:7
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