J. Mater. Sci. Technol. ›› 2021, Vol. 81: 162-174.DOI: 10.1016/j.jmst.2020.10.085

• Research Article • Previous Articles     Next Articles

Metal-organic framework derived hierarchical NiCo2O4 triangle nanosheet arrays@SiC nanowires network/carbon cloth for flexible hybrid supercapacitors

Xuemin Yin, Hejun Li*(), Ruimei Yuan, Jinhua Lu*()   

  1. State Key Laboratory of Solidification Processing, Shaanxi Province Key Laboratory of Fiber Reinforced Light Composite Materials, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi’an, 710072, China
  • Received:2020-08-31 Revised:2020-10-19 Accepted:2020-10-22 Published:2021-01-16 Online:2021-01-16
  • Contact: Hejun Li,Jinhua Lu
  • About author:lujinhua@nwpu.edu.cn (J. Lu).
    *E-mail addresses: lihejun@nwpu.edu.cn (H. Li),

Abstract:

To overcome the disadvantages of traditional powder electrodes, such as the insufficient performance, the aggregation of active materials, and the complex fabrication process, rationally constructing free-standing electrode materials with hierarchical architecture is an effective and promising method, which could further improve the electrochemical properties. Herein, using metal-organic framework nanoarrays (MOFNAs) as self-sacrificial templates and SiC nanowires (SiCNWs) network as nanoscale conductive skeletons, we successfully fabricated the hierarchical core-shell SiCNWs@NiCo2O4NAs on carbon cloth (CC) substrate. Taking advantages of structural merits, such as hierarchical porous triangle-like NiCo2O4NAs, the interwoven SiCNWs network and conductive CC substrate, when evaluated as a binder-free supercapacitor electrode, the CC/SiCNWs@NiCo2O4NAs shows a high specific capacitance of 1604.7 F g-1 (specific capacity of 222.9 mA h g-1) at 0.5 A g-1, good rate performance, and excellent cycling stability. Significantly, the hybrid supercapacitor assembled with CC/SiCNWs@NiCo2O4NAs as the cathode and MOF derived CC/SiCNWs@CNAs as the anode, could deliver a high specific density of 49.9 W h kg-1 at a specific power of 800 W kg-1, stable cycling performance, and good flexibility. Impressively, this feasible strategy for fabricating hierarchical structure displays great potential in the field of energy storage.

Key words: Metal-organic framework, SiC nanowire, NiCo2O4, Flexible hybrid supercapacitors