Facile and large-scale chemical synthesis of highly porous secondary submicron/micron-sized NiCo2O4 materials for high-performance aqueous hybrid AC-NiCo2O4 electrochemical capacitors
Facile and large-scale chemical synthesis of highly porous secondary submicron/micron-sized NiCo2O4 materials for high-performance aqueous hybrid AC-NiCo2O4 electrochemical capacitors
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DOI：
10.1016/j.electacta.2013.05.114
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发表时间：
2013-09-30
影响因子：
6.6
通讯作者：
Wang, Hongyu
中科院分区：
文献类型：
--
作者：
Ding, Rui;Qi, Li;Wang, Hongyu
高多孔镍钴矿 (NiCo2O4) 材料已通过简便且可扩展的化学合成路线合成。所得NiCo2O4材料呈现出典型的次生亚微米/微米尺寸（0.1-2μm）团聚形态，表现出大比表面积（190.1 m(2) g(-1)）和高孔隙率（1.136 cm(3) g(-1)）。所制备的NiCo2O4电极表现出高比电容（1 A g(-1)时为351 F g(-1)）和高倍率性能（8 A g(-1)时电容保持率为82.1%），优于许多报道的NiCo2O4材料。此外，组装的AC-NiCo2O4水性混合电容器表现出高功率和能量密度（8 A g(-1)下2805 W kg(-1)、6.8 Wh kg(-1)）和高循环稳定性（1.5 A g(-1)下5000次循环后损失15%）。 NiCo2O4 材料的高性能归因于其大表面积和高度多孔结构，这有助于丰富的表面电活性位点和易于电化学反应的离子传输途径。 (C) 2013 Elsevier Ltd. 保留所有权利。
Highly porous nickel cobaltite (NiCo2O4) materials have been synthesized via a facile and scalable chemical synthesis route. The obtained NiCo2O4 material displays a typical secondary submicron/micron-sized (0.1-2 mu m) agglomerate morphology, exhibiting large surface area (190.1 m(2) g(-1)) and high porosity (1.136 cm(3) g(-1)). The fabricated NiCo2O4 electrode shows high specific capacitance (351 F g(-1) at 1 A g(-1)) and high-rate capability (82.1% capacitance retention at 8 A g(-1)), which is superior to many reported NiCo2O4 materials. Further, the assembled AC-NiCo2O4 aqueous hybrid capacitor exhibits high power and energy densities (2805 W kg(-1), 6.8 Wh kg(-1) at 8 A g(-1)) and high cycling stability (15% loss after 5000 cycles at 1.5 A g(-1)). The high-performance of the NiCo2O4 materials is attributed to their large surface area and highly porous structure which contribute to rich surface electroactive sites and easy ions transport pathways for facile electrochemical reactions. (C) 2013 Elsevier Ltd. All rights reserved.