Waste cotton fiber-based graphitized carbon/Fe7S8 composites derived from sulfurization of pyrolyzate Fe-Fe3C intermediates as anodes for high-performance sodium-ion batteries

Converting waste biomass resources into electrochemical energy storage materials has been regarded as a valuable contribution to implementing sustainable energy. Herein, waste cotton fiber-based graphitized carbon/Fe7S8 (CFGC/Fe7S8) composites were successfully synthesized from sulfurization of Fe-Fe3C inter-mediates, produced by simple pyrolysis of waste cotton fabric and low-cost iron compound. The as -pre-pared CFGC/Fe7S8 composites were composed of partly graphitized carbon fiber embedded with well -dispersed Fe7S8 nanoparticles. This structure offers excellent performance for electrochemical sodium storage. Acting as an anode in sodium-ion battery, CFGC/Fe7S8 composites deliver a high discharge specific capacity of 661 mAh g-1 after 100 cycles at 0.1 A g-1 and an initial Coulombic efficiency of 85.8% and achieve a discharge specific capacity of 328 mAh g-1 after 800 cycles even at a high current density of 2 A g-1. These results demonstrate that Fe-Fe3C intermediate derived-Fe7S8 nanoparticles combined with cotton fiber -based graphitic carbon plays a significant role in the electrochemical performance of sodium ion storage. These findings present a novel strategy for transferring waste textile into high-performance sodium storage materials.(c) 2022 Published by Elsevier B.V.

Automated summary

Converting waste cotton fabric into graphitized carbon/Fe7S8 composites shows promise as a sustainable and high-performance material for electrochemical sodium storage.