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Effect of ultrasonic on structure and electrochemical performance of α-Ni(OH)_2 electrodes 被引量:2

超声波对α-Ni(OH)_2电极结构及电化学性能的影响(英文)
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摘要 Al/Co co-doped α-Ni(OH)2 samples were prepared by either ultrasonic co-precipitation method (Sample B) or co-precipitation method (Sample A). The crystal structure and particle size distribution of the prepared samples were examined by X-ray diffraction (XRD) and laser particle size analyzer, respectively. The results show that Sample B has more crystalline defects and smaller average diameter than Sample A. The cyclic voltammetry and electrochemical impedance spectroscopy measurements indicate that Sample B has better electrochemical performance than Sample A, such as better reaction reversibility, lower charge-transfer resistance and better cyclic stability. Proton diffusion coefficient of Sample B is 1.96×10-10cm2/s, which is two times as large as that (9.78×10-11cm2/s) of Sample A. The charge-discharge tests show that the discharge capacity (308 mA·h/g) of Sample B is 25 mA·h/g higher than that of Sample A (283 mA·h/g). 分别采用共沉淀法和超声波共沉淀法制备Al/Co复合掺杂α-Ni(OH)2样品A和B,用XRD和激光粒度仪表征样品的晶相结构和粒度分布。结果表明,样品B比样品A具有较多的晶格缺陷和较小的平均粒径。循环伏安特性及电化学阻抗谱测试显示,样品B比样品A具有更好的电化学性能:较好的反应可逆性、较低的电荷转移电阻和较高的循环寿命等。样品B的质子扩散系数为1.96×10-10cm2/s,约为样品A(9.78×10-11cm2/s)的2倍。充放电测试显示,样品B的放电比容量达到308mA·h/g,比样品A的放电比容量高25mA·h/g。
出处 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第12期2654-2659,共6页 中国有色金属学报(英文版)
基金 Project (10774030) supported by the National Natural Science Foundation of China Project (2008J1-C161) supported by the Science and Technology Program of Guangzhou City of China
关键词 Al/Co co-doped α-Ni(OH)2 ultrasonic co-precipitation method proton diffusion coefficient charge-transfer resistance electrochemical performance Al/Co复合掺杂α-Ni(OH)2 超声波共沉淀法 质子扩散系数 电荷转移电阻 电化学性能
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