Porous lanthanum doped NiO microspheres for supercapacitor application

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• 作者：D ; an Han ; Xiaoyan Jing ; Jun Wang ; Piaoping Yang ; Dalei Song ; Jingyuan Liu
• 关键词：Nickel oxide ; Porous spheres ; La3+-doping ; Electrochemical performance
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2012
• 出版时间：15 August, 2012
• 年：2012
• 卷：682
• 期：Complete
• 页码：37-44
• 全文大小：1357 K

文摘

La³⁺ doped NiO microspheres with porous structure were fabricated using colloidal carbon spheres as hard template via a hydrothermal method followed by calcination process. The morphologies and microstructures of the samples were examined by scanning electron microscopy (SEM), transition electron microscopy (TEM) and X-ray diffraction (XPS). The key point of the successful realization was that the La³⁺-doped NiO microspheres exhibited smaller feature sizes, high specific surface area (277.5 m² g^?1)and large pore volume (0.79 cm³ g^?1). Electrochemical properties were characterized by cyclic voltammetry and galvanostatic charge/discharge. The microstructure observations confirmed that La³⁺ ions were successfully doped into the NiO spheres after heat treatment, and the porous structure was achieved. As a result, 1.5 mol % La³⁺-doped NiO showed a remarkable specific capacitance of 253 F g^?1 (2 times higher than that of the pure NiO) and good cycling stability (34 % capacity increase after 500 cycles). These results demonstrate that La³⁺-doped NiO composites as electrode materials have potential application for high-performance supercapacitors.