In Situ Fabrication of Carbon-Encapsulated Fe7X8 (X = S, Se) for Enhanced Sodium Storage
| Autor: | Tiezhong Liu, Fenghua Zheng, Yayun Guo, Chenghao Yang, Lingzhi Zhao, Qichang Pan, Yanxin Li, Youpeng Li, Yanzhen Liu, Junhua Hu |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Sodium Nanoparticle chemistry.chemical_element 02 engineering and technology In situ fabrication 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox 0104 chemical sciences Anode chemistry Chemical engineering General Materials Science 0210 nano-technology Pyrolysis Carbon |
| Zdroj: | ACS Applied Materials & Interfaces. 11:19040-19047 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.9b00500 |
| Popis: | Sodium-ion batteries (SIBs) have been regarded as a promising alternative to lithium-ion batteries due to the natural abundance of sodium in the earth's crust. In our work, fusiform Fe7X8@C (X = S, Se) composites were obtained via a one-step pyrolysis strategy applied to SIB anode materials. The formed carbon skeleton could prevent the Fe7X8 nanoparticles from agglomeration and stabilize the interface of Fe/Na2X generated in the redox reactions. Fe7X8@C (X = S, Se) exhibits excellent reversible specific capacity (1005.3 mAh g-1 under 0.2 A g-1 for Fe7S8@C and 458.5 mAh g-1 under 0.5 A g-1 for Fe7Se8@C), outstanding rate performance (654.7 mAh g-1 for Fe7S8@C and 392.9 mAh g-1 for Fe7Se8@C going through 300 loops even under 2 A g-1), and excellent cycling properties (795.8 mAh g-1 after 50 loops under 0.2 A g-1 for Fe7S8@C and 399.9 mAh g-1 going through 150 loops under 0.5 A g-1 for Fe7Se8@C). The excellent electrochemical performance of Fe7X8@C composites makes them promising anode materials for SIBs. |
| Databáze: | OpenAIRE |
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