Carbon Fibers Embedded With Iron Selenide (Fe3Se4) as Anode for High-Performance Sodium and Potassium Ion Batteries
Asif Mahmood, Zeeshan Ali, Hassina Tabassum, Aftab Akram, Waseem Aftab, Rashad Ali, Muhammad Waqas Khan, Suraj Loomba, Ahmed Alluqmani, Muhammad Adil Riaz, Muhammad Yousaf, Nasir Mahmood
Abstract
The development of sodium and potassium ion batteries (SIBs/KIBs) has seen tremendous growth in recent years due to their promising properties as a potential replacement for lithium-ion batteries (LIBs). Here, we report ultrafine iron selenide (Fe 3 Se 4 ) nanoparticles embedded into one-dimensional (1D) carbon fibers (Fe 3 Se 4 @CFs) as a potential candidate for SIBs/KIBs. The Fe-based metal-organic framework particles (MOFP) are used as a Fe source to obtain highly dispersed Fe 3 Se 4 nanoparticles in the product. The Fe 3 Se 4 @CF consisted of ultrafine particles of Fe 3 Se 4 with an average particle size of 10 nm loaded into CFs with an average diameter of 300 nm. The product exhibited excellent specific activity of 439 and 435 mAh/g at the current density of 50 mA/g for SIBs and KIBs, respectively. In addition, the as-prepared anodes (Fe 3 Se 4 @CFs) exhibited excellent capacity retention up to several hundred cycles (700 cycles for SIBs and 300 cycles for KIBs). The high activity and excellent stability of the developed electrodes make Fe 3 Se 4 @CFs a promising electrode for next-generation batteries.