Affiliation:
1. Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and Technology Tianjin 300457 China
2. Jiangsu Co‐Innovation Center of Efficient Processing and Utilization of Forest Rescources College of Chemical Engineering Nanjing Forestry University Nanjing 210037 China
3. State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou 510640 China
Abstract
AbstractThe intrinsic poor rheological properties of MXene inks result in the MXene nanosheets in dried MXene microfibers prone to self‐stacking, which is not conducive to ion transport and diffusion, thus affecting the electrochemical performance of fiber‐based supercapacitors. Herein, robust cellulose nanofibrils (CNF)/MXene hybrid fibers with high electrical conductivity (916.0 S cm−1) and narrowly distributed mesopores are developed by wet spinning. The interfacial interaction between CNF and MXene can be enhanced by hydrogen bonding and electrostatic interaction due to their rich surface functional groups. The interfacial modulation of MXene by CNF can not only regulate the rheology of MXene spinning dispersion, but also enhance the mechanical strength. Furthermore, the interlayer distance and self‐stacking effect of MXene nanosheets are also regulated. Thus, the ion transport path within the fiber material is optimized and ion transport is accelerated. In H2SO4 electrolyte, a volumetric specific capacitance of up to 1457.0 F cm−3 (1.5 A cm−3) and reversible charge/discharge stability are demonstrated. Intriguingly, the assembled supercapacitors exhibit a high‐volume energy density of 30.1 mWh cm−3 at 40.0 mW cm−3. Moreover, the device shows excellent flexibility and cycling stability, maintaining 83% of its initial capacitance after 10 000 charge/discharge cycles. Practical energy supply applications (Power for LED and electronic watch) can be realized.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
3 articles.
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