Guo Hong, Li Tingting, Chen Weiwei, Liu Lixiang, Yang Xiangjun, Wang Yapeng, Guo Yicheng
School of Chemistry Science and Engineering, Yunnan University, Kunming 650091, Yunnan, China.
Nanoscale. 2014 Dec 21;6(24):15168-74. doi: 10.1039/c4nr04422c. Epub 2014 Nov 6.
Hollow porous CoFe(2)O(4) nanocubes from metal-organic frameworks were fabricated through a general facile strategy. The intrinsic hollow nanostructure can shorten the lengths for both electronic and ionic transport, enlarge the surface area of electrodes, and improve accommodation of the volume change during Li insertion/extraction cycling. The hybrid multi-elements characteristics allow the volume change to take place in a stepwise manner during the electrochemical cycle. Therefore, the as-prepared CoFe(2)O(4) electrode exhibits outstanding performance as anode materials for lithium ion batteries. The stable capacity arrives at 815 mA h g(-1) for 20 C. Subsequently, a specific capacity of ca. 1043 mA h g(-1) is recovered when the current rate reduces back to 1 C after 200 cycles. This general strategy may shed light on a new avenue for large-scale synthesis of hollow porous hybrid nanocubes via MOFs for energy storage, environmental remediation and other novel applications.
通过一种通用的简便策略制备了来自金属有机框架的中空多孔CoFe₂O₄纳米立方体。其固有的中空纳米结构可以缩短电子和离子传输的长度，扩大电极的表面积，并改善锂嵌入/脱出循环过程中体积变化的适应性。混合多元素特性使得在电化学循环过程中体积变化以逐步的方式发生。因此，所制备的CoFe₂O₄电极作为锂离子电池的负极材料表现出出色的性能。在20 C时，稳定容量达到815 mA h g⁻¹。随后，在200次循环后，当电流速率降至1 C时，可恢复约1043 mA h g⁻¹的比容量。这种通用策略可能为通过金属有机框架大规模合成中空多孔混合纳米立方体用于能量存储、环境修复和其他新应用开辟一条新途径。
