NiMoO4-modified MnO2 hybrid nanostructures on nickel foam: electrochemical performance and supercapacitor applications
NiMoO4-modified MnO2 hybrid nanostructures on nickel foam: electrochemical performance and supercapacitor applications
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泡沫镍上 NiMoO4 修饰的 MnO2 杂化纳米结构：电化学性能和超级电容器应用
DOI：
10.1039/c5nj00639b
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发表时间：
2015-07
影响因子：
3.3
通讯作者：
Kang, Long
中科院分区：
文献类型：
--
作者：
Zhang, Wei-Bin;Kong, Ling-Bin;Luo, Yong-Chun;Kang, Long
采用水热合成法合成了一种新型的NiMoO 4修饰MnO 2杂化纳米结构的自支撑电极。基于表面形貌，提出了NiMoO 4表面改性不仅阻止了MnO 2在KOH碱性电解液中的溶解，而且提高了容量的可能机理。因此，该电极表现出令人满意的2525 F g-1的电容（在0.5 A g-1的电流密度下在-0.2-0.6 V的电位范围内）、出色的倍率性能和优异的循环稳定性。复合NiMoO 4修饰MnO 2电极具有优异的综合性能的原因不仅在于NiMoO 4和MnO 2之间的耦合效应，还在于半导体表面复合效应提高了电极的电导率。此外，组装了非对称超级电容器，其中混合NiMoO 4改性的MnO 2和活性炭分别用作正极和负极，并且在0和1.6 V之间的电池电压内，在0.5 A g-1的电流密度下，显示了135 F g-1的最大比电容，因此，超级电容器表现出高能量密度和稳定的功率特性。
A novel self-supported electrode of NiMoO4-modified MnO2 hybrid nanostructures on nickel foam has been designed and synthesized using a combination of hydrothermal syntheses. Based on the morphology, a possible mechanism that the surface modification of NiMoO4 not only prevents the MnO2 from dissolving in an alkaline electrolyte of KOH but also improves the capacity is proposed. Therefore, this electrode manifests a satisfying capacitance of 2525 F g−1 (within a potential range of −0.2–0.6 V at a current density of 0.5 A g−1), outstanding rate capability and excellent cycling stability. The reason that the hybrid NiMoO4-modified MnO2 electrode has excellent comprehensive performance is not only the coupling effect which between NiMoO4 and MnO2 but also the semiconductor surface recombination effect which improved the electrical conductivity. Moreover, an asymmetric supercapacitor has been assembled, where the hybrid NiMoO4-modified MnO2 and activated carbon act as the positive and negative electrodes, respectively, and a maximum specific capacitance of 135 F g−1 is demonstrated within a cell voltage between 0 and 1.6 V at a current density of 0.5 A g−1; thus, the supercapacitor exhibits a high energy density and stable power characteristics.
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