Polyaniline wrapped manganese dioxide nanorods: Facile synthesis and as an electrode material for supercapacitors with remarkable electrochemical properties
Polyaniline wrapped manganese dioxide nanorods: Facile synthesis and as an electrode material for supercapacitors with remarkable electrochemical properties
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聚苯胺包裹的二氧化锰纳米棒：合成简便，作为超级电容器的电极材料，具有卓越的电化学性能
DOI：
10.1016/j.jallcom.2019.04.295
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发表时间：
2019-07
影响因子：
6.2
通讯作者：
Xu Hongyao
中科院分区：
文献类型：
--
作者：
Mezgebe Mebrahtu Melake;Xu Kaibing;Wei Gang;Guang Shanyi;Xu Hongyao
导电聚合物和过渡金属氧化物具有较高的电荷存储特性，是超级电容器的理想电极。利用不同的技术制备了新型的聚苯胺（PANI）和二氧化锰（MnO2）纳米复合材料来增强电容。在此，我们报告了一种通过原位水热聚合方法分别控制二氧化锰纳米棒和聚苯胺核/壳结构的简便方法。对聚苯胺包裹二氧化锰纳米棒（MnO2@PANI）的结构和形貌进行了表征，并对其电容增强性能进行了仔细的探讨。实验结果显示的特定电容MnO2@PANI40 (40% MnO2relative苯胺单体)纳米复合材料是665 F g-1at 1 g - 1,级的电流密度高于原始汇总(273 F g - 1)级和原始聚苯胺(434 F g - 1)级。此外，在扫描速率为100 mv−1的情况下，经过1500个连续CV循环后，纳米复合材料的原始电容仍保持82%，这远远高于原始PANI的稳定性（48%）。MnO2@PANI40-based电极优异的电化学性能归功于纳米复合材料的核/壳网络级联结构的协同作用。独特的结构提高了离子传输效率，减少了离子扩散路径，均匀的聚苯胺涂层对mno2在酸性电解质中的溶解提供了保护。此外，聚苯胺的高导电性（由于其半氧化半还原状态，经XPS测试证实）对纳米复合材料的电容增强起重要作用。
Conducting polymers and transition metal oxides are good electrodes for supercapacitors owing to their high charge storage characteristics. Different techniques have been utilized in fabricating novel nanocomposites of polyaniline (PANI) and manganese dioxide (MnO2) for capacitance enhancement. Herein, we report a facile approach towards the control of core/shell architecture of MnO2nanorods and PANI, respectively, via in-situ hydrothermal polymerization method. Structure and morphology of the PANI wrapped MnO2nanorods (MnO2@PANI) were properly characterized and their capacitance enhancement was explored carefully. The experimental results revealed that the specific capacitance of MnO2@PANI40 (40% MnO2relative to aniline monomer) nanocomposite is 665 F g-1at a current density of 1 A g-1, higher than that of pristine MnO2(273 F g-1) and pristine PANI (434 F g-1). Moreover, 82% of the original capacitance of the nanocomposite is retained after 1500 consecutive CV cycles at a scan rate of 100 mVs−1, which is far higher than the stability of pristine PANI (48%). Excellent electrochemical performance of the MnO2@PANI40-based electrode is attributed to the synergistic effect of the core/shell networked hierarchical structure of the nanocomposite. The unique structure improves the ion transportation efficiency and reduces the ion diffusion path and the uniform coating of PANI offers protection against the dissolution of MnO2in the acidic electrolyte. Furthermore, high electrical conductivity status of PANI (due to its half oxidation-half reduction status, justified by XPS test) plays an important role in the capacitance enhancement of the nanocomposite.
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影响因子：
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作者：
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影响因子：
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作者：
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