Affiliation of Author(s):材料科学与技术学院
Journal:NANOSCALE
Key Words:HIGH-PERFORMANCE SUPERCAPACITORS LONG CYCLE STABILITY ENERGY-STORAGE ELECTROCHEMICAL PROPERTIES ULTRAHIGH CAPACITANCE NICKEL COBALTITE GRAPHENE FILM FOAM AEROGELS
Abstract:To increase the volumetric and gravimetric capacitances of supercapacitors, 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) which is ultra lightweight with the lowest density of 0.8 mg cm(-3), and has a high open surface structure for electrolyte accessibility and excellent compressible properties as the electrode scaffold has been successfully fabricated by the pyrolysis method which could produce the carbon nanotube sponge easily on a large scale without high-cost and time-consuming processes. Moreover, a NiCo2O4 nanosheet supported on the 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 NiCo2O4/NSCS electrode was adjusted by mechanical compression and the most favorable density of the film for both high volumetric and gravimetric capacitances obtained was 1.21 g cm(-3). The thick NiCo2O4/NSCS film of 72 mu m has been fabricated at this favorable density, presenting both high volumetric and gravimetric capacitances of 597 F cm(-3) and 1074 F g(-1) at 1 A g(-1), respectively, indicating that the structure of the NSCS is extremely feasible for obtaining a thick film electrode with excellent volumetric and gravimetric capacitances. Furthermore, an asymmetric supercapacitor of NiCo2O4/NSCS//NGN/CNTs was fabricated, exhibiting a high gravimetric energy density of 47.65 W h kg(-1) at 536 W kg(-1) and a volumetric energy density of 33.44 W h L-1 at 376.16 W L-1.
ISSN No.:2040-3364
Translation or Not:no
Date of Publication:2017-11-21
Co-author:Yue, Shihong,Lu, Liang,Jin, Fengqiao,Han, Qiwei,Zhang Xiaogang,Liu, Jie
Correspondence Author:Tong Hao
Date of Publication:2017-11-21