Ni–Zn binary system hydroxide, oxide and sulfide materials: synthesis and high supercapacitor performance
Ni–Zn binary system hydroxide, oxide and sulfide materials: synthesis and high supercapacitor performance
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DOI：
10.1039/c5ta07169k
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发表时间：
2015-11
影响因子：
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通讯作者：
Xiaobing Wang;Jiangjiang Hu;Weidong Liu;Guoyong Wang;J. An;J. Lian
中科院分区：
文献类型：
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作者：
Xiaobing Wang;Jiangjiang Hu;Weidong Liu;Guoyong Wang;J. An;J. Lian
为了避免活性电极材料制备过程中的团聚，采用带式反应区模型合成了Ni-Zn系材料（NixZn 1 −xOH、NiO-ZnO和NixZn 1 −xS），并对其进行了系统表征。在这些材料中，直径约为30 nm的NixZn 1 −xS多孔球形纳米颗粒具有大量相互连接的微孔，这是由于合成中的柯肯德尔效应造成的，导致148.4 m2 g−1的高表面积和特殊的离子扩散路径。在三电极系统测试中，NixZn 1 −xS多孔球形纳米颗粒在1 A g−1的电流密度下显示出1867 F g−1的最高比电容，以及优异的倍率性能和循环稳定性。以NixZn 1 −xS为正极、活性炭为负极的非对称超级电容器具有优异的电化学性能。这些结果为我们提供了一种改进的方法来合成金属氢氧化物、氧化物和硫化物，以获得具有高超级电容器性能的材料。
To avoid aggregation in the production of the active electrode material, Ni–Zn system materials (NixZn1−xOH, NiO–ZnO and NixZn1−xS) were synthesized by using a belt reaction zone model, and then were characterized systematically in this work. Among these materials, NixZn1−xS porous spheroid nanoparticles with diameters ∼30 nm possess abundant interconnected micropores caused by the Kirkendall effect in the synthesis, leading to a high surface area of 148.4 m2 g−1 and special paths for ion diffusion. In the three-electrode system testing, NixZn1−xS porous spheroid nanoparticles show the highest specific capacitance of 1867 F g−1 at a current density of 1 A g−1, as well as excellent rate capability and cycling stability. Using NixZn1−xS as the positive electrode and active carbon as the negative electrode, the asymmetric supercapacitor device exhibits an excellent electrochemical performance. The results provide us with a modified method to synthesize metal hydroxides, oxides and sulfides, in order to obtain materials with high supercapacitor performance.