Thiophene containing conjugated microporous polymers derived sulfur-enriched porous carbon supported Fe3O4 nanoparticles with superior lithium storage properties
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Thiophene containing conjugated microporous polymers (SCMP) derived sulfur-enriched porous carbon supported Fe3O4 nanoparticles were successfully synthesized from the mixture of SCMP and ferric salt. XRD results prove that sulfur-enriched porous carbon supported Fe3O4 nanoparticles (Fe3O4-SPC) contain crystalline Fe3O4 with a face-centered-cubic structure. SEM images reveal that Fe3O4-SPC are hierarchical agglomerates constituted by nanoparticles with a range of 20–50 nm. TEM and TEM–EDX results further prove that Fe3O4 nanoparticles are embedded in the SPC nanoparticles, which can buffer the huge volume changes of Fe3O4 nanoparticles during the charge/discharge process. Nitrogen adsorption/desorption analysis reveals that Fe3O4-SPC are mesoporous materials with a surface area of 60.3 m2 g−1. These special structures enable Fe3O4-SPC show wonderful cycling performance (897.2 mAh g−1 after 300 cycles at 0.6 A g−1), being much better than those of bare Fe3O4. In addition, Fe3O4-SPC deliver a reversible capacity of 984.2 mAh g−1 at 100 mA g−1.
This research was supported by the National Nature Science Foundation of China (No. 21466020).