Carbon-coated mesoporous NiO nanoparticles as an electrode material for high performance electrochemical capacitors
Carbon-coated mesoporous NiO nanoparticles as an electrode material for high performance electrochemical capacitors
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碳包覆介孔氧化镍纳米粒子作为高性能电化学电容器的电极材料
DOI：
10.1039/c3nj00890h
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Hu, Junqing
中科院分区：
文献类型：
--
作者：
Xu, Kaibing;Zou, Rujia;Hu, Junqing
通过合理的设计，采用水热法大规模合成了非晶态碳包覆介孔NiO(记为NiO@C)纳米复合材料。所合成的NiO@C纳米复合材料的介孔特性提供了超高的活性表面积，从而显著提高了离子的插层和电极材料的利用率，而纳米复合材料中的碳壳极大地提高了整个电极的电子导电性。由于NiO和碳材料之间具有很强的协同效应，作为高性能准电容器的介孔NiO@C纳米复合材料表现出较高的比电容(在2Ag−1时为931Fg−1)和长期循环稳定性(6000次循环后∼损失为7%)，而NiO(2Ag−1时为707F g−1,6000次循环后∼损失为13%)。
A rational design has resulted in the large-scale synthesis of amorphous carbon coated mesoporous NiO (denoted as NiO@C) nanocomposites through a hydrothermal method. The mesoporous characteristics of as-synthesized NiO@C nanocomposites provide an ultrahigh active surface area and thus significantly enhance the intercalation of ions and the utilization rate of electrode materials, while the carbon shell within the nanocomposites improves greatly the electron conductivity of the overall electrode. Being beneficial for a strong synergistic effect between NiO and carbon materials, the mesoporous NiO@C nanocomposites as high-performance pseudocapacitors exhibited a high specific capacitance of 931 F g−1 at 2 A g−1 and a long-term cycling stability (∼7% loss after 6000 cycles), as compared with NiO (707 F g−1 at 2 A g−1 and ∼13% loss after 6000 cycles).