Fabrication and Enhanced Supercapacitive Performance of Fe2N@Cotton-based Porous Carbon fibers as Electrode Material
Guangzhen Zhao, Ke Ning, Mingqi Wei, Linlin Zhang, Lu Han, Guang Zhu, Jie Yang, Hongyan Wang, Fei Huang
Abstract
With the emergence of supercapacitors (SCs), the creation of bio-based electrode materials has grown in significance for the advancement of energy storage. However, it is particularly difficult for cathode materials to meet the demands of practical uses due to their low energy density. Herein, MIL-88 was fabricated in situ on the surface of cotton fibers used in cosmetics, followed by creating Fe2[email protected] carbon fiber composite (Fe2[email protected]) through heat treatment at various temperatures. Fe2[email protected] demonstrates excellent specific capacitance performance (552 F g−1 at 1 A g−1). Meanwhile, The AC//Fe2[email protected] device exhibits the largest energy density of 38 Wh kg−1 at 800 W kg−1 and a long cycling stability (83.3% capacity retention after 6000 cycles). Our elaborately designed Fe2[email protected] demonstrate multiple advantages: i) the Fe2[email protected] shows abundant mesopores, providing abundant ion-diffusion pathways for mass transport and rich graphite microstructures, improving electrical conductivity for electron transferowning; ii) the rich nitrogen dopants and Fe2N structure within all carbon components increase the capacitance through their pseudocapacitive contribution. These findings highlight the importance of biomass derived carbon materials for SCs applications.