Jump to main content
Jump to site search


A Binder-free NiCo2O4 Nanosheets/3D Elastic N-Doped Hollow Carbon Nanotube Sponge Electrode with High Volumetric and Gravimetric Capacitance for Asymmetric Supercapacitor

Abstract

To increase the volumetric and gravimetric capacity of supercapacitor, a new class of electrode materials with high electrochemical activity and favorable structures is extremely desired. In this work, a hollow novel nitrogen-doped 3D elastic single-walled carbon nanotube sponge (NSCS) possessing ultra light-weight with the lowest density of 0.8 mg cm−3, high open surface structure for electrolyte accessibility, excellent compressible properties as the electrode scaffold has been successfully fabricated by pyrolyzing method which could produce the carbon nanotube sponge easily in large-scale without high-cost and time-consuming. Moreover, NiCo2O4 nanosheet supported on NSCS has been successfully fabricated. The highest volumetric and gravimetric capacitance of this electrode is 790 F cm−3 at 1.43 g cm−3 and 1618 F g−1 at 0.54 g cm−3 with excellent cycling stability. The density of 3D NiCo2O4/NSCS electrode was adjusted by mechnical compression and the most favorable density of the film for both high volumetric and gravimetric capacitance was obtained with 1.21 g cm−3. The thick NiCo2O4/NSCS film of 72 μm has been fabricated at this favorable density, presenting both high volumetric and gravimetric capacitance of 597 F cm−3, 1074 F g−1 at 1 A g−1, indicating that the structure of NSCS is extremely feasible for obtaining thick film electrode with excellent volumetric and gravimetric capacitance. Furthermore, a asymmetric supercapacitor of NiCo2O4/NSCS//NGN/CNTs was fabricated, exhibiting high gravimetric energy density of 47.65 W h kg−1 at 536 W kg−1 and volumetric energy density of 33.44 W h L−1 at 376.16 W L−1.

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 Apr 2017, accepted on 27 Sep 2017 and first published on 28 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR02498C
Citation: Nanoscale, 2017, Accepted Manuscript
  •   Request permissions

    A Binder-free NiCo2O4 Nanosheets/3D Elastic N-Doped Hollow Carbon Nanotube Sponge Electrode with High Volumetric and Gravimetric Capacitance for Asymmetric Supercapacitor

    H. Tong, S. Yue, L. Lu, F. Jin, Q. Han, X. Zhang and J. Liu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02498C

Search articles by author

Spotlight

Advertisements