Liu Li, Zhang Huijuan, Mu Yanping, Yang Jiao, Wang Yu
The State Key Laboratory of Mechanical Transmissions and the School of Chemistry and Chemical Engineering, Chongqing University , 174 Shazheng Street, Shapingba District, Chongqing 400044, P.R. China.
ACS Appl Mater Interfaces. 2016 Jan 20;8(2):1351-9. doi: 10.1021/acsami.5b10237. Epub 2016 Jan 8.
A monocrystalline and porous FeCo2O4 nanoneedles array growing directly on a nickel foam substrate was obtained by a hydrothermal technique accompanying with combustion of the one-dimensional precursor. The average length of the FeCo2O4 nanoneedles is approximately 2 μm, while the diameter of the root segment of the nanoneedle can be estimated to be around 100 nm, which gradually reduces to only several nanometers at the top. When the as-prepared porous FeCo2O4 nanoneedles array with a high surface area of 58.49 m(2) g(-1) was applied as binder-free electrode in lithium-ion batteries, it exhibited satisfactory electrochemical performance, such as outstanding reversibility (Coulombic efficiency of approximately 92-95%), high specific capacity (1962 mAh g(-1) at the current density of 100 mA g(-1)), and excellent rate performance (discharge capacity of 875 mAh g(-1) at the current density of 2000 mA g(-1)), due to the various favorable conditions. Undoubtedly, the simple but effective strategy can be expanded to other high-performance binary metal-oxide materials.
通过水热技术并伴随着一维前驱体的燃烧，在泡沫镍基底上直接生长出了单晶且多孔的FeCo2O4纳米针阵列。FeCo2O4纳米针的平均长度约为2μm，而纳米针根部的直径估计约为100nm，在顶部逐渐减小到仅几纳米。当将所制备的具有58.49 m(2) g(-1)高比表面积的多孔FeCo2O4纳米针阵列用作锂离子电池的无粘结剂电极时，由于各种有利条件，它表现出令人满意的电化学性能，如出色的可逆性（库仑效率约为92 - 95%）、高比容量（在100 mA g(-1)电流密度下为1962 mAh g(-1)）以及优异的倍率性能（在2000 mA g(-1)电流密度下放电容量为875 mAh g(-)1）。毫无疑问，这种简单而有效的策略可以扩展到其他高性能二元金属氧化物材料。
