Hierarchical NiCo2O4 Nanosheets@halloysite Nanotubes with Ultrahigh Capacitance and Long Cycle Stability As Electrochemical Pseudocapacitor Materials
Hierarchical NiCo2O4 Nanosheets@halloysite Nanotubes with Ultrahigh Capacitance and Long Cycle Stability As Electrochemical Pseudocapacitor Materials
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具有超高电容和长循环稳定性的多级NiCo2O4纳米片@埃洛石纳米管作为电化学赝电容器材料
DOI：
10.1021/cm500786a
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发表时间：
2014-08-12
影响因子：
8.6
通讯作者：
Yang, Guang
中科院分区：
文献类型：
--
作者：
Liang, Jin;Fan, Zhaoyang;Yang, Guang
采用共沉淀法和热处理相结合的方法制备了NiCo 2 O 4纳米片/埃洛石纳米管的一维分级纳米结构。采用SEM、TEM、HRTEM、XRD、XPS等手段对NiCo 2 O 4纳米片/埃洛石纳米管复合材料的微观结构和化学组成进行了研究。当充放电电流密度为10 A g-1时，独特的NiCo 2 O 4纳米片@埃洛石纳米管的比电容在8600次循环结束时为1728 F g-1，导致仅5.26%的容量损失。概括地说，由于埃洛石的层状和分级纳米片以及强烈的阳离子/阴离子交换性能，所获得的NiCo 2 O 4纳米片@埃洛石纳米管显示出良好的电容和显著的循环稳定性。
One-dimensional hierarchical nanostructure of NiCo2O4 nanosheets@halloysite nanotubes was successfully prepared through a facile coprecipitation method followed by a thermal annealing treatment. The microstructure and chemical composition of NiCo2O4 nanosheets@halloysite nanotubes are investigated by SEM, TEM, HRTEM, XRD, and XPS. The specific capacitance of the unique NiCo2O4 nanosheets@halloysite nanotubes is 1728 F g–1 at the end of 8600 cycles when the charge–discharge current density is 10 A g–1, leading to only 5.26% capacity loss. Broadly, the as-obtained NiCo2O4 nanosheets@halloysite nanotubes reveal ultrahigh capacitance and remarkable cycling stability in virtue of the ultrathin and hierarchical nanosheets and intense cation/anion exchange performance of halloysite.