Hierarchical MnMoO4/CoMoO4 heterostructured nanowires with enhanced supercapacitor performance
Hierarchical MnMoO4/CoMoO4 heterostructured nanowires with enhanced supercapacitor performance
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DOI：
10.1038/ncomms1387
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发表时间：
2011-07-01
影响因子：
16.6
通讯作者：
Luo, Yan-Zhu
中科院分区：
文献类型：
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作者：
Mai, Li-Qiang;Yang, Fan;Luo, Yan-Zhu
复杂异质结构纳米材料的合成和应用是近年来的研究热点，它具有比单一结构材料更优越的上级电化学性能。在这里，我们合成的三维（3D）多组分氧化物，MnMoO 4/CoMoO 4。采用简单的热处理方法，在温和的条件下，成功地在骨架材料MnMoO 4上制备了分级异质结构，并实现了表面改性。我们制备了基于分级MnMoO 4/CoMoO 4异质结构纳米线的非对称超级电容器，其在1 A g（-1）的电流密度下显示出187.1 F g（-1）的比电容，并且具有良好的可逆性，在1，000次循环后循环效率为98%。这些结果进一步表明，构建3D分级异质结构可以改善电化学性能。“定向附着”和“自组装”晶体生长机制被提出来解释异质结构的形成。
Recent attention has been focused on the synthesis and application of complex heterostructured nanomaterials, which can have superior electrochemical performance than single-structured materials. Here we synthesize the three-dimensional (3D) multicomponent oxide, MnMoO4/CoMoO4. Hierarchical heterostructures are successfully prepared on the backbone material MnMoO4 by a simple refluxing method under mild conditions; and surface modification is achieved. We fabricate asymmetric supercapacitors based on hierarchical MnMoO4/CoMoO4 heterostructured nanowires, which show a specific capacitance of 187.1 F g(-1) at a current density of 1 A g(-1), and good reversibility with a cycling efficiency of 98% after 1,000 cycles. These results further demonstrate that constructing 3D hierarchical heterostructures can improve electrochemical properties. 'Oriented attachment' and 'self-assembly' crystal growth mechanisms are proposed to explain the formation of the heterostructures.