Design of high-performance core-shell hollow carbon nanofiber@nickel-cobalt double hydroxide composites for supercapacitive energy storage

作者：Xu, Juan; Wang, Yan; Yang, Chao; Cao, Jianyu; Chen, Zhidong^*; Ni, Chaoying^*

来源：Journal of Solid State Electrochemistry, 2018, 22(12): 3853-3862.

DOI：10.1007/s10008-018-4075-z

• Hollow carbon nanofiber
• HCNF@Ni0
• 67Co0
• 33-LDH
• Core-shell nanostructure
• Supercapacitors

The supercapacitive performances of supercapacitor mainly depend on the physical nanostructure and micro-morphology of electrode materials. Here, we demonstrated the design, synthesis and electrochemical performances of core-shell hollow carbon nanofiber@nickel-cobalt-layered double hydroxide (HCNF@ Ni0.67Co0.33-LDH) nanocomposites with an optimized Ni/Co molar ratio of 2:1. The HCNF was used as superiorly conductive core to sustain the nanoporous silky Ni0.67Co0.33-LDH shell, which can efficiently provide fast transport pathways for electrons and electrolyte ions. The outstanding specific capacitance of 2486Fg(-1) at 1Ag(-1) based on galvanostatic charge-discharge curves were acquired for the highly electroactive HCNF@Ni0.67Co0.33-LDH. Furthermore, the HCNF@Ni0.67Co0.33-LDH electrode delivered a distinguished rate capability with a specific capacitance of 1890Fg(-1) even at 15Ag(-1). Notably, an asymmetric supercapacitor with HCNF@Ni0.67Co0.33-LDH as cathode and HCNF as anode was devised, which presented a prominent specific capacitance of 228Fg(-1), good energy density of 62.1Whkg(-1), and impressive cycling stability (90.6% capacitance retention after 10,000cycles).

• 出版日期2018-12
• 单位常州大学