超级电容器
锌
材料科学
纤维素
多孔性
兴奋剂
电极
纳米纤维
碳纳米纤维
复合材料
碳纤维
化学工程
化学
碳纳米管
冶金
复合数
电容
光电子学
物理化学
工程类
作者
Zhen Zhao,Yong-Peng Hu,Kaiyang Liu,Wei Yu,Guoxian Li,Chuizhou Meng,Shijie Guo
标识
DOI:10.1016/j.susmat.2024.e00982
摘要
Zinc-ion hybrid supercapacitors (ZHSCs) are among the most promising electrochemical energy storage technologies because of their high energy density, environmental sustainability, low price, and inherent security. High-load, high-capacity cathodes are critical for the practical application of ZHSCs. However, it is challenging to achieve optimal performance of high-loading electrodes due to slow reaction kinetics, retarded ion transport, and structural instability. Herein, a salt-template technique was used to fabricate nitrogen-doped porous carbon (NPC) with large surface area, abundant mesopores, and electroactive nitrogen dopants. When combined with a fibrous network scaffold of carbon nanotubes and cellulose nanofibers (CNT/CNF), the optimized NPC delivered an outstanding specific capacitance of 133.4 mAh g−1 and a remarkable capacity retention of 95.4% after 10,000 cycles. More impressively, we achieved a cathode with high mass-loading of 10 mg cm−2 without significantly sacrificing the electrochemical performance (area capacity of 2.05 mAh cm−2 and good cycling stability with capacity retention of 86.2% after 3000 cycles). The excellent performance can be attributed to the continuous electron/ion conduction pathways of CNT/CNF scaffold and redox-active surface generated by the favorable heteroatom-doped porous carbon. In sum, this work offers a platform for making high mass-loading carbon electrodes for practical ZHSCs.
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