Journal
NANOSCALE ADVANCES
Volume 3, Issue 1, Pages 231-239Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0na00897d
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Funding
- Natural Science Foundation of Guangdong Province [2018A030313739]
- Science and Technology Program of Guangzhou [2019050001]
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By embedding Fe7Se8 in carbon nanofibers, the material exhibits improved rate performance and remarkable cycling stability for sodium storage, showing practical feasibility with a reasonable specific capacity even after 200 cycles.
Transition metal chalcogenides especially Fe-based selenides for sodium storage have the advantages of high electric conductivity, low cost, abundant active sites, and high theoretical capacity. Herein, we proposed a facile synthesis of Fe7Se8 embedded in carbon nanofibers (denoted as Fe7Se8-NCFs). The Fe7Se8-NCFs with a 1D electron transfer network can facilitate Na+ transportation to ensure fast reaction kinetics. Moreover, Fe7Se8 encapsulated in carbon nanofibers, Fe7Se8-NCFs, can effectively adapt the volume variation to keep structural integrity during a continuous Na+ insertion and extraction process. As a result, Fe7Se8-NCFs present improved rate performance and remarkable cycling stability for sodium storage. The Fe7Se8-NCFs exhibit practical feasibility with a reasonable specific capacity of 109 mA h g(-1) after 200 cycles and a favorable rate capability of 136 mA h g(-1) at a high rate of 2 A g(-) when coupled with Na3V2(PO4)(3) to assemble full sodium ion batteries.
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