期刊
ELECTROCHIMICA ACTA
卷 341, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136042
关键词
Cobalt sulfide; Zeolitic imidazolate framework; Polypyrrole; Supercapacitor
资金
- NSF of Zhejiang Province [LY20E020005]
- NSFC [51572272, 21971131]
- NSF of Ningbo [2019A610003]
- Open Foundation of State Key Laboratory of Structural Chemistry [20200022]
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2018-K06]
- K.C. Wong Magna Fund in Ningbo University
Metal sulfides are promissing electrode materials for supercapacitors, but they suffer from low electrical conductivity, poor rate capability and mechanical instability. To tackle these drawbacks, here, Co3S4 hollow nanocages (HNCs) derived from ZIF-67 have been inlaid on polypyrrole (PPy) tubes, forming a Co3S4-HNCs@PPy hybrid with intertwined Co3S4-to-PPy-to-Co3S4 conductive networks via a facile solution method. The as-synthesized Co3S4-HNCs@PPy shows outstanding electrochemical activity (1706 F g(-1) at 1 A g(-1)) along with high rate capability (73.2% retention at 10 A g(-1)), significantly superior to individual Co3S4-HNCs, PPy or a physical mixture of Co3S4 and PPy. Remarkably, an asymmetric supercapacitor based on Co3S4-HNCs@PPy is capable of affording a high energy density of 50.5 W h kg(-1) (at 849.1 W kg -1 ) with high durability (82.8% retention after 10,000 cycles). The outstanding supercapacitor property can be attributed to the synergistic advantages of the intertwined Co3S4-to-PPy-to-Co3S4 networks including rich reactive sites, shortened charge diffusion pathway as well as enhanced charge transfer and mechanical stability. These merits make Co3S4-HNCs@PPy a promising candidate for renewable and sustainable energy storage. (C) 2020 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据