Facile Route to an Efficient NiO Supercapacitor with a Three-Dimensional Nanonetwork Morphology
Facile Route to an Efficient NiO Supercapacitor with a Three-Dimensional Nanonetwork Morphology
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DOI：
10.1021/am3021894
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发表时间：
2013-03-13
影响因子：
9.5
通讯作者：
Jang, Ji-Hyun
中科院分区：
文献类型：
--
作者：
Kim, Sun-I;Lee, Jung-Soo;Jang, Ji-Hyun
采用溶胶-凝胶法制备了具有三种不同形貌的NiO纳米结构，并利用其形貌依赖的超级电容器性能。具有独特的三维（3D）网络和最高孔体积的纳米花形NiO显示出最好的超级电容器性质。花形纳米结构中的纳米孔提供了与电解质接触和输送的优势，允许NiO结构中的3D纳米通道，提供更长的电子通路。NiO纳米结构的XPS和EIS数据证实，花形NiO，其中具有最低的表面积在三种形态中，有效地优化作为一个上级电极，并产生最大的赝电容。这项研究表明，形成3D纳米网络是改善超级电容器电化学性能的直接手段。
NiO nanostructures with three distinct morphologies were fabricated by a sol-gel method and their morphology-dependent supercapacitor properties were exploited. The nanoflower- shaped NiO with a distinctive three-dimensional (3D) network and the highest pore volume shows the best supercapacitor properties. The nanopores in flower-shaped nanostructures, offering advantages, in contact with and transport of the electrolyte, allow for 3D nanochannels in NiO structure, providing longer electron pathways. The XPS and EIS data of the NiO nanostructure confirm that the flower shaped NiO, which has the lowest surface area among the three morphologies, was effectively optimized as a superior electrode and yielded the greatest pseudocapacitance. This study indicates that forming a 3D nanonetwork is a straightforward means of improving the electrochemical properties of a supercapacitor.