Recyclable Fe3O4/MWCNT/CNF composite nanopaper as an advanced negative electrode for flexible asymmetric supercapacitors

被引:7
作者
Zhao, Haoran [1 ]
Jin, Haidong [1 ]
Li, Shenghui [1 ]
Dong, Yahui [1 ]
Wang, Shipeng [1 ]
Cheng, Qian [1 ]
Li, Yu [2 ]
机构
[1] Northeast Forestry Univ, Coll Mat Sci & Engn, Key Lab Biobased Mat Sci & Technol, Minist Educ, Harbin 150040, Peoples R China
[2] Northeast Forestry Univ, Coll Sci, Harbin 150040, Peoples R China
关键词
CARBON NANOTUBE HYBRID; HIGH-PERFORMANCE; NANOPARTICLES; NANOCOMPOSITES; NANOFIBERS; HYDROGEL; GRAPHENE; DOTS;
D O I
10.1039/d3ta04295b
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
Asymmetric supercapacitors (ASCs) with flexible performance have considerable potential for applications in wearable and implantable electronics; however, traditional electrodes have low energy intensity and fragility, which makes meeting the increasing requirements of green energy supply devices challenging. In this study, a recyclable Fe3O4/multiwalled carbon nanotube (MWCNT)/cellulose nanofiber (CNF) nanopaper was constructed based on a three-dimensional conductive network between MWCNT@Fe3O4 and CNFs using simple vacuum filtration technology. As the negative electrode, the nanopaper exhibits exceptional flexibility (it can be folded into a small plane without breaking), high electrical conductivity (1016.3 S m(-1)), and extraordinary mass-and volume-specific capacitances of 229.9 F g(-1) and 735.68 mF cm(-2) at 5 mV s(-1), respectively. A flexible ASC comprising Fe3O4/MWCNT/ CNF demonstrated a high specific capacity of 107.0 F g(-1) (2.94 F cm(-2)) at a current density of 0.5 A g(-1). It exhibited an energy density and a power density of 38.0 W h kg(-1) and 405.1 W kg(-1), respectively. Furthermore, the capacitor retained an energy density of 18.8 W h kg(-1) at a high power density (42.2 kW kg(-1)) and >90% of the specific capacitance after 5000 charge-discharge cycles at 5 A g(-1). This research will pave the way for further advances in degradable and recyclable nanopaper electrodes toward building a cutting-edge multifunctional platform for electronic skin, human motion recording, and wearable electronics.
引用
收藏
页码:21123 / 21134
页数:12
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