Enhanced tortuosity for electrolytes in microwave irradiated self-organized carbon-doped Ni/Co hydroxide nanocomposite electrodes with higher Ni/Co atomic ratio and rate capability for an asymmetric supercapacitor
Enhanced tortuosity for electrolytes in microwave irradiated self-organized carbon-doped Ni/Co hydroxide nanocomposite electrodes with higher Ni/Co atomic ratio and rate capability for an asymmetric supercapacitor
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DOI：
10.1088/1361-6528/aa854f
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发表时间：
2017-10
期刊：
影响因子：
3.5
通讯作者：
Niraj Kumar;Viresh Kumar;H. Panda
中科院分区：
文献类型：
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作者：
Niraj Kumar;Viresh Kumar;H. Panda
我们展示了一个绿色，方便和快速的微波介导的方法制备炭黑（CB）纳入Ni/Co氢氧化物多孔纳米复合材料，并研究了各种质量负载的CB对超级电容器性能的影响。采用X射线衍射、傅里叶变换红外光谱和X射线光电子能谱对CB与Ni/Co氢氧化物的结构和相互作用进行了表征，表明CB与Ni/Co氢氧化物形成单相Ni/Co氢氧化物的时间缩短。形态学研究表明，添加CB到Ni/Co氢氧化物开发了一个松散的网络结构，具有明确的建筑孔。此外，纳米复合材料表现出显着的改善孔隙率和原子比的Ni/Co与碳的百分比增加，这导致在更高的扩散的电解质，因此导电。所开发的电极材料在电流密度1 Ag−1下表现出1526 Fg−1的最大比电容值，具有优异的循环稳定性（在5000次循环下保持92%）、能量密度（76 Wh Kg−1）、功率密度（250 W Kg−1）和倍率性能。制造固态非对称超级电容器装置并利用其有效地使商业LED变亮以验证真实的使用。
We demonstrate a green, facile and rapid microwave-mediated process for fabricating carbon black (CB) incorporated Ni/Co hydroxide porous nanocomposites and study the effect of various mass loading of CB on supercapacitor performance. The structure and interactions between CB and Ni/Co hydroxide are characterized by using x-ray diffraction, Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy, which suggest the miniaturization of the single-phase Ni/Co hydroxide formation time. A morphology study reveals that the addition of CB into Ni/Co hydroxide develops a loose network structure with well-defined architectural pores. In addition, the nanocomposites demonstrate noticeable improvements in porosity and atomic ratio of Ni/Co with an increasing percentage of carbon, which results in a higher diffusion of electrolytes, and hence electrical conduction. The developed electrode materials exhibit a maximum specific capacitance value of 1526 Fg−1 at current density 1 Ag−1 with excellent cyclic stability (92% retention at 5000 cycles), energy density (76 Wh Kg−1), power density (250 W Kg−1) and rate capability. A solid state asymmetric supercapacitor device is fabricated and utilized to brighten a commercial LED effectively for validating real usage.