期刊
CERAMICS INTERNATIONAL
卷 47, 期 23, 页码 33020-33027出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.08.202
关键词
Graphene; Manganese dioxide; Cycling stability; Supercapacitors
资金
- National Natural Science Foundation of China [22075142]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
A new method of designing hierarchical and binder-free electrode based on MnO2 material for stable supercapacitor with high specific capacitance is proposed in this study. The self-standing MnO2/NGCF cathode exhibited excellent electrochemical performance and the assembled symmetric aqueous supercapacitor showed high energy density and outstanding long-life stability. This work provides a new perspective for developing stable symmetric supercapacitors with high energy density and long cycling stability using MnO2 material.
The low capacitance utilization and capacitance fading of manganese dioxide (MnO2) is mainly due to poor electro-conductivity and irreversible phase transform. This work proposes a new method of designing hierarchical and binder-free electrode based on MnO2 material for stable supercapacitor with high specific capacitance. Herein, we fabricated the self-standing electrode of MnO2 on nitrogen-doped graphene and single wall carbon nanotubes (SWCNTs) self-standing film (NGCF) by electrochemical deposition. As a result, as-prepared MnO2/ NGCF cathode showed excellent electrochemical performance of 489.7 F g-1 at 1 A g-1. Assembled symmetric aqueous supercapacitor (SC) manifests high voltage of 2.4 V and presents excellent high energy density of 106.7 Wh kg-1 at 1200 W kg-1 and outstanding long-life stability without no decay after 10 000 charge-discharge circuits. This work proposes a new view of designing hierarchical and binder-free electrode with high energy density and long cycling stability based on MnO2 material for stable symmetric supercapacitor.
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