A pseudocapacitive asymmetric supercapacitor assembled by hollow NiCo2O4 hierarchical micro-spheres and nickel-loaded hollow VN hierarchical micro-flowers

作者：Ji, Chenchen; Li, Zhiwei; Xu, Mengjiao; Liu, Lang; Mi, Hongyu^*

来源：Solid State Ionics, 2018, 324: 168-175.

DOI：10.1016/j.ssi.2018.07.004

• NiCo2O4
• VN
• Pseudocapacitive
• Hollow hierarchical structure
• Asymmetric supercapacitor

Designing novel complementary electrode combination is an effective way to improve the electrochemical performance of a supercapacitor (SC). In this work, a NiCo2O4 pseudocapacitive cathode material with a hollow hierarchical micro-sphere structure (HMS) was prepared. The obtained NiCo2O4 HMS sample possesses a high capacitance (1148 Fg(-1)) and excellent rate capability. A metallic Ni-loaded VN hybrid (Ni/VN) pseudocapacitive anode material with a hollow hierarchical flower-like architecture (HHMF) was also synthesized. The Ni/VN hybrid anode exhibits a high capacitance and excellent rate capability. Due to the desirable electrochemical performance and complementary potential windows of the two electrodes, a high-voltage pseudocapacitive (-) Ni/VN//NiCo2O4(+) asymmetric supercapacitor (ASC) was fabricated. The obtained ASC with a pseudocapacitive electrode combination can be cycled reversibly in a wide potential window of 0-1.5 V, and exhibits a high specific capacitance of 52 Fg(-1), a maximum energy density of 16.25 Wh kg(-1). These results show that the pseudocapacitive (-)Ni/VN//NiCo2O4(+) ASC have great potential for application in high-performance energy storage systems.

• 出版日期2018-10-15
• 单位中国科学院长春应用化学研究所; 新疆大学