Hollow nickel-cobalt sulfide nanospheres cathode hybridized with carbon spheres anode for ultrahigh energy density asymmetric supercapacitors

被引:37
|
作者
Gong, Jiaxu [1 ]
Wang, Yingrong [2 ]
Wang, Jiaheng [1 ]
Liu, Yuxing [1 ]
Hu, Cunhai [1 ]
Zhou, Tianlong [1 ]
Yu, Qinlin [1 ]
Yang, Junxiao [1 ]
Dai, Yatang [1 ]
机构
[1] Southwest Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Environm Friendly Energy Mat, Mianyang 621010, Peoples R China
[2] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China
关键词
Nickel-cobalt sulfide; Hollow nanospheres; Carbon spheres; Supercapacitor; POROUS CARBON; NICO2S4; NANOSHEETS; NI FOAM; ELECTRODE MATERIALS; NANOTUBE COMPOSITE; FIBER PAPER; PERFORMANCE; ARRAYS; NANOPARTICLES; FABRICATION;
D O I
10.1016/j.ijhydene.2022.01.083
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
There has been increasing attention to the transition metal sulfides because of their unique property such as high electrical conductivity. Moreover, hollow sphere structures can provide excellent performance in electrochemical energy conversion applications due to their rich holes volume and unique properties. In this study, nickel-cobalt sulfide (Ni-CoS) hollow spheres are successfully synthesized by two step methods of hard template method and hydrothermal method. Benefiting from the hollow sphere structure with optimum size and mesoporous surface, the Ni-Co-S exhibits an excellent specific capacity of 819.9 C g-1, and has good stability in the charge-discharge cycles. In addition, uniform size and monodisperse carbon sphere (CS) that synthesized by a simple self-assembly method also shows excellent electrochemical properties. Furthermore, the fabricated Ni-Co-S//CS asymmetric supercapacitor shows energy density of 65 Wh kg-1 at a power density of 850 W kg-1 and outstanding cycling stability with a capacity retention of 82.8% after 10,000 cycles, demonstrating that as-prepared Ni-Co-S hollow spheres and carbon spheres possess promising potential as electrode materials for high-performance asymmetric supercapacitors. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:10056 / 10068
页数:13
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