High electroactive material loading on a carbon nanotube/carbon nanofiber as an advanced free-standing electrode for asymmetric supercapacitors†,Chemical Communications

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High electroactive material loading on a carbon nanotube/carbon nanofiber as an advanced free-standing electrode for asymmetric supercapacitors†
Chemical Communications ( IF 4.3 ) Pub Date : 2019-03-12 00:00:00 , DOI: 10.1039/c9cc01277j
Yongsheng Zhou _{1,

2,

3,

4,

5} , Yingchun Zhu _{4,

5,

6,

7,

8} , Bingshe Xu _{4,

9,

10,

11,

12} , Xueji Zhang _{13,

14,

15,

16,

17}

Affiliation

College of Chemistry and Materials Engineering
Anhui Science and Technology University
Bengbu
P. R. China
Key Laboratory of Inorganic Coating Materials CAS
Shanghai Institute of Ceramics
Chinese Academy of Sciences
Shanghai
Key Laboratory of Interface Science and Engineering in Advanced Materials
Ministry of Education
Taiyuan University of Technology
Taiyuan
Beijing Key Laboratory for Bioengineering and Sensing Technology
Research Center for Bioengineering and Sensing Technology
School of Chemistry and Bioengineering
University of Science & Technology Beijing
Haidian District

3D hierarchical nanocomposites always lead to excellent electrochemical properties. In this research, we have successfully designed and synthesized a hierarchical three-dimensional cobalt sulfide encapsulated carbon nanotube/carbon nanofiber (Co₉S₈@CNT/CNF) composite, resulting in a high-performance supercapacitor with an unrivalled capacitance of ≈1580 F g⁻¹ at a current density of 1 A g⁻¹. An asymmetric supercapacitor (ASC) based on these 3D hierarchical Co₉S₈@CNT/CNF composites exhibits a maximum energy density of 58 W h kg⁻¹ at a power density of 1000 W kg⁻¹ and maintains it at 38 W h kg⁻¹ at a higher power density of 16.7 kW kg⁻¹. Even after 10 000 charge/discharge cycles, the ASC still retains 93% of the initial capacitance at a current density of 5 A g⁻¹. A large number of aligned CNF nanochannels combined with the synergistic effects of cobalt sulfide nanowires encapsulated in CNTs obviously accelerates the ion transfer speed and shortens the ion transfer distance, thereby boosting both power density and energy density.

中文翻译：

作为不对称超级电容器的高级独立式电极，碳纳米管/碳纳米纤维上的电活性材料负荷较高†

3D分层纳米复合材料始终具有出色的电化学性能。在这项研究中，我们已经成功设计并合成了一种分层的三维硫化钴封装的碳纳米管/碳纳米纤维（Co ₉ S ₈ @ CNT / CNF）复合材料，从而产生了一种高性能超级电容器，其无与伦比的电容为≈1580F g ^-1在1 A g ^-1的电流密度下。基于这些3D分层共同的不对称超级电容器（ASC）₉小号₈ @ CNT / CNF复合材料表现出58 W时公斤的最大能量密度^-1处的1000瓦kg的功率密度^-1和在38 W时公斤维护它^-1在16.7 kW kg ^-1的更高功率密度下。即使经过1万次充电/放电循环，ASC仍会在5 A g ^-1的电流密度下保留93％的初始电容。大量排列的CNF纳米通道与封装在CNT中的硫化钴纳米线的协同作用相结合，明显加快了离子传输速度，缩短了离子传输距离，从而提高了功率密度和能量密度。

更新日期：2019-03-12

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