Facile Synthesis of α-MnO2 with a 3D Staghorn Coral-like Micro-Structure Assembled by Nano-Rods and Its Application in Electrochemical Supercapacitors
Facile Synthesis of α-MnO2 with a 3D Staghorn Coral-like Micro-Structure Assembled by Nano-Rods and Its Application in Electrochemical Supercapacitors
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DOI：
10.3390/app7050511
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Y. Bing;Lei Zhang;Shichun Mu;Jiujun Zhang
中科院分区：
文献类型：
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作者：
Y. Bing;Lei Zhang;Shichun Mu;Jiujun Zhang
摘要：通过固相反应和湿化学处理相结合的方法合成具有α晶体结构的锰氧化物，这是一种简单且廉价的合成路线，易于大规模生产。讨论了合成反应时间和酸处理温度对α-MnO 2晶体结构、形貌和电化学电容性能的影响。证明了在25 °C下在酸中处理较长时间的样品显示出均匀的纳米棒，其聚集以在棒的表面上形成具有精细特征的微建筑物。这种微结构具有大的表面积和更容易电化学接近的活性位点，从而导致更好的电化学电容性能。我们期望这些结果将提供实用信息的形状和形貌控制合成的纳米结构的功能材料在超级电容器的应用。
Abstract: Manganese oxides with an alpha crystal structure are synthesized via combined solid-state reaction and wet chemical processing, which is a simple and inexpensive synthetic route easy for mass production. The effects of the synthetic reaction duration and the temperature of acid treatments on crystal structure, morphology, and electrochemical capacitive properties of α-MnO2 are discussed. It is evidenced that the samples treated in acid for a longer time at 25 °C display the uniform nanorods that are aggregated to form micro-buildings with fine features on the surface of rods. This microstructure possesses large surface areas and more active sites that are easy to access electrochemically, leading to a better electrochemical capacitive performance. We expected that these results would provide the practical information for shape- and morphology-controlled synthesis for nanostructured functional materials in supercapacitor applications.