Indexed by:
期刊论文
First Author:
Du, Naixu
Correspondence Author:
Li, XC (reprint author), Dalian Univ Technol, Dept Chem Engn, State Key Lab Fine Chem, Linggong Rd 2, Dalian 116024, Peoples R China.
Co-author:
Zheng, Wenji,Li, Xiangcun,He, Gaohong,Wang, Le,Shi, Jianhang
Date of Publication:
2017-09-01
Journal:
CHEMICAL ENGINEERING JOURNAL
Included Journals:
SCIE、EI
Document Type:
J
Volume:
323
Page Number:
415-424
ISSN No.:
1385-8947
Key Words:
Shape-controlled; Nickel sulfide; Double-shelled; Hollow structure;
Supercapacitor
Abstract:
Hollow micro-and nanostructured materials with controllable shapes are appealing materials for electrochemical energy storage devices with high energy and power densities. Herein, double-shelled hollow nickel sulfides with controlled shape (cube-, ellipsoid-and capsule-shaped) were successfully synthesized by using different morphological alpha-Fe2O3 templates. The as-obtained nickel sulfides have uniform size and well-defined double shells that consist of crossed ultrathin NiS nanosheets. When evaluated as electrode materials for supercapacitors, the capsule-shaped structure exhibits the highest specific capacitance of 1159 F g(-1) at a current density of 2 A g(-)1 due to its high specific surface area (100.2 m(2) g(-1)), low equivalent series resistance (0.80 Omega) and ion diffusive resistance. More importantly, the asymmetric capacitor NiS (capsule-shaped)vertical bar vertical bar RGO@Fe3O4 shows a high energy density of 43.7 Wh kg-at a power density of 664 W kg(-1) (21.8 Wh kg(-1) at 8000 W kg(-1)), and after 5000 charge-discharge cycles, 833% of its capacitance is remained at the current density of 5 A g(-1). (C) 2017 Elsevier B.V. All rights reserved.
Translation or Not:
no
