Construction of Fe7Se8@Carbon nanotubes with enhanced sodium/potassium storage

作者：Yuan, Jujun; Gan, Yunfei; Xu, Xijun^*; Mu, Meiqi; He, Haishan; Li, Xiaokang^*; Zhang, Xianke; Liu, Jun^*

来源：Journal of Colloid and Interface Science, 2022, 626: 355-363.

DOI：10.1016/j.jcis.2022.06.139

• Anode
• Fe7 Se8 @C nanotubes
• Sodium ion batteries
• Potassium ion batteries
• Electrochemical performance

The Fe7Se8@Carbon (C) nanotubes are successfully synthesized using Fe3O4@C nanotubes as sacrificial templates. Fe7Se8@C nanotubes exhibit excellent rate behaviour and maintainable capacity (319 mAh g(-1) at 2 A g(-1) upon 720 cycles), when utilized as SIBs anode. Moreover, for PIBs anode, Fe7Se8@C nan-otubes also exhibit outstanding rate behaviour and maintainable capacity 222 mAh g(-1) at 2 A g(-1) upon 500 cycles). The superior electrochemical performance of Fe7Se8@C nanotubes is ascribed to the unique structure, where the hierarchical hollow tubular characteristic of Fe7Se8@C composites can mitigate the volume expansion of Fe7Se8 and supply effective transmission paths for both Na'(K') and electrons within repeated cycle processes, and additionally, N-doped carbon layer can further protect the integrality of Fe7Se8@C nanotubes from destruction within the cycle processes, and enhance electronic conductivity.

• 单位
  xk; 广东工业大学