Nanostructured porous wires of iron cobaltite: novel positive electrode for high-performance hybrid energy storage devices
Nanostructured porous wires of iron cobaltite: novel positive electrode for high-performance hybrid energy storage devices
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DOI：
10.1039/c5ta02701b
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发表时间：
2015-08
影响因子：
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通讯作者：
A. Pendashteh;J. Palma;M. Anderson;R. Marcilla
中科院分区：
文献类型：
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作者：
A. Pendashteh;J. Palma;M. Anderson;R. Marcilla
对更高效的储能系统的需求刺激了研究工作，以寻求和开发具有有前途性能的新能源材料。在这方面，二元金属氧化物由于与其单一氧化物类似物相比具有更好的电化学性能而引起了极大的关注。本文采用水热法在泡沫镍上制备了FeCo 2 O 4纳米多孔丝，并将其用作无粘结剂/添加剂的电极，研究了FeCo 2 O 4作为超级电容器电极材料的电化学行为。在初始循环中，FeCo 2 O 4样品在10 mV s-1的扫描速率下表现出407 F g-1的高比电容。在循环2000次后，材料的电活化导致电容随后增加至610 F g-1，显示出这种材料用于能量存储的有希望的特性。所制备的FeCo_2O_4样品的性能远优于相应的单一氧化物。此外，组装了多孔纳米结构的FeCo 2 O 4//AC非对称超级电容器，并且可以实现23 W h kg−1的高能量密度和3780 W kg−1的最大功率密度。
The demand for more efficient energy storage systems stimulates research efforts to seek and develop new energy materials with promising properties. In this regard, binary metal oxides have attracted great attention due to their better electrochemical performance as compared to their single oxide analogues. Herein, nanostructured porous wires of FeCo2O4 were grown on nickel foam via a facile hydrothermal route and employed as binder/additive-free electrodes to investigate the electrochemical behavior of FeCo2O4 as electrode materials for supercapacitors. The FeCo2O4 sample exhibits a high specific capacitance of 407 F g−1 at a scan rate of 10 mV s−1 in the initial cycling. After cycling for 2000 cycles, electro-activation of the material results in subsequent increase in capacitance up to 610 F g−1, showing promising characteristics of this material for energy storage. The performance of the prepared FeCo2O4 sample is found to be much better than that of the corresponding single oxides. Furthermore, porous nanostructured FeCo2O4//AC asymmetric supercapacitors were assembled and could achieve a high energy density of 23 W h kg−1 and a maximum power density of 3780 W kg−1.