Sci. Adv. Today 3 (2017) 25269  
  Research Article  
   
   
         
Facile synthesis of size-modulated carbon confined Fe3O4 nanoparticles as stable anodes for lithium and sodium storage  
  Wei Lia, Jiashen Menga, Qi Lia, Yuzhu Wua, Wei Yanga, Congyun Huangb and Liqiang Maia,c  
     
a State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China
b School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P. R. China
c Department of Chemistry, University of California, Berkeley, California 94720, United States of America

   
  Abstract  
  Size-modulated carbon confined Fe3O4 nanoparticles were synthesized via a facile and controllable pyrolysis of iron-based metal-organic framework. Compared with large-sized Fe3O4@C, small-sized Fe3O4@C exhibits greatly enhanced electrochemical performances as the anode for both lithium ion batteries (LIBs) and sodium ion batteries (SIBs). When tested as an anode for LIBs, small-sized Fe3O4@C delivers a reversible capacity of 912 mAh g-1 at the current density of 0.2 A g-1 after 50 cycles. In addition, small-sized Fe3O4@C also demonstrates superior sodium storage performance. When cycled at the current density of 0.1 A g-1, the initial discharge capacity of 588 mAh g-1 is achieved, and the discharge capacity stabilizes at 290 mAh g-1 after 50 cycles. The enhanced electrochemical properties of this material are attributed to the rational design and construction of the porous structure and the controlled size of primary particles.  
     
   
  Cite this article as:  
  Wei Li, Jiashen Meng, Qi Li, Yuzhu Wu, Wei Yang, Congyun Huang and Liqiang Mai, Facile synthesis of size-modulated carbon confined Fe3O4 nanoparticles as stable anodes for lithium and sodium storage, Sci. Adv. Today 3 (2017) 25269.