Co9S8 quasi-hexagonal nanoparticles coupled with WS2 nanoring anchored on 3D sulfur, nitrogen Co-doped carbon nanotubes@graphene oxide cross-linking architecture for high performance asymmetric supercapacitor

纳米环 材料科学 超级电容器 电解质 纳米技术 化学工程 电极 碳纤维 电流密度 纳米结构 电容 纳米颗粒 石墨烯 氧化物 复合数 复合材料 化学 物理 物理化学 量子力学 工程类 冶金
作者
Yujin Li,Lian Liu,Yadi Yu,Xueni Shang,Fanbin Meng
出处
期刊:Carbon [Elsevier BV]
卷期号:189: 503-518 被引量:25
标识
DOI:10.1016/j.carbon.2021.12.093
摘要

Designing advanced hybrid supercapacitors (SCs) electrode materials with 3D cross-linking hierarchical porous architecture has desirable structural advantages, which can facilitate ion transport and provide excellent reaction site. Herein, a unique nanostructure consisting of Co 9 S 8 quasi-hexagonal nanoparticles coupled with WS 2 nanoring anchored on 3D sulfur, nitrogen Co-doped carbon nanotubes@graphene oxide (Co 9 S 8 @WS 2 -NS-15mlGO@CNTs) was obtained using a facile solvothermal strategy. This cross-linking and hierarchical porous nanostructure can maximize the electrical conductivity of entirety, which provides a favorable transport and permeability for the ions and electrons of the electrolyte environment. Benefiting from the structural compositional advantages and full play of the synergetic coupling effect, the as-prepared Co 9 S 8 @WS 2 -NS-15mlGO@CNTs electrode material exhibits absolutely the topmost specific capacitance of 1820.8 F g −1 at a current density of 1 A g −1 and outstanding cycle stability with a capacitance retention of 90.2% after 10000 cycles at 30 A g −1 . Moreover, an asymmetric supercapacitor (ASC) fabricated by Co 9 S 8 @WS 2 -NS-15mlGO@CNTs (positive electrode) and NS-15mlGO@CNTs (negative electrode) presents an ultra-high energy density of 95.3 Wh kg −1 at a power density of 600 W kg −1 , and long cycle life with 86.7% specific capacity retention at a current density of 20 A g −1 after 10000 cycles. It is believed that the presented work may open a new perspective to fabricate future competitive high-performance energy storage devices. • Co 9 S 8 quasi-hexagonal nanoparticles coupled with WS 2 nanoring anchored on 3D sulfur, nitrogen Co-doped carbon nanotubes@graphene oxide was obtained. • The as-prepared Co 9 S 8 @WS 2 -NS-15mlGO@CNTs electrode material exhibits absolutely the topmost specific capacitance of 1820.8 Fg -1 at a current density of 1 A g −1 . • The fabricated ASC device presents an ultra-high energy density of 95.3 Wh kg −1 at a power density of 600 W kg −1 . • The maximum energy density is remarkably superior to those of the previous reported transition-metal sulfides supported by 3D porous network carbon ASC devices.
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