| 不同放电深度下LaNi3.8Co0.6Mn0.3Al0.3合金的电化学行为研究 |
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| 引用本文： | 刘文平,周怀营,倪成员,王仲民,姚青荣,兰兴先. 不同放电深度下LaNi3.8Co0.6Mn0.3Al0.3合金的电化学行为研究[J]. 桂林电子科技大学学报, 2012, 0(3): 254-258 |
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| 作者姓名： | 刘文平 周怀营 倪成员 王仲民 姚青荣 兰兴先 |
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| 作者单位： | 桂林电子科技大学 材料科学与工程学院,广西 桂林 541004 |
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| 基金项目： | 国家自然科学基金(50971049);广西研究生教育创新计划(2011105950805M39) |
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| 摘 要： | 为了分析储氢合金放电过程中的电化学反应与动力学变化规律,采用电化学交流阻抗分析方法研究 La-Ni3.8Co0.6Mn0.3Al0.3合金电极在不同放电深度下的电化学行为.结果表明:随着放电深度的增加,电极表面活性氢覆盖面积S 及内部金属颗粒间接触电阻Rpp逐渐降低,即电极的导电性增加;此外,交换电流密度Io也随放电深度增加而增大,意味着电极表面反应速率加快,同时氢扩散系数 DH 明显降低;合金电极动力学在放电前期主要由电极表面反应速率控制,后期由电极中氢原子在合金颗粒内部的氢扩散系数控制.
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| 关 键 词： | 储氢合金 电化学行为 交流阻抗 表面反应 氢扩散系数 |
Electrochemical behaviors of LaNi3.8Co0.6Mn0.3Al0.3 alloy under different depth of discharge |
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| Liu Wenping,Zhou Huaiying,Ni Chengyuan,Wang Zhongmin,Yao Qingrong,Lan Xingxian. Electrochemical behaviors of LaNi3.8Co0.6Mn0.3Al0.3 alloy under different depth of discharge[J]. Journal of Guilin University of Electronic Technology, 2012, 0(3): 254-258 |
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| Authors: | Liu Wenping Zhou Huaiying Ni Chengyuan Wang Zhongmin Yao Qingrong Lan Xingxian |
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| Affiliation: | (School of Material Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China) |
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| Abstract: | The electrochemical behaviors of LaNi3.8Co0.6Mn0.3Al0.3alloy under different depth of discharge(DOD) have been studied by electrochemical impedance spectroscopy(EIS) to discuss the relationship between electrochemical reaction and kinetics.It shows that the area of active reaction superficial on the electrode S and internal contact resistance Rppdecrease gradually with the increasing of DOD,implying the improvement of electrical conductivity.Moreover,the exchange current density I0 increases,indicated the surface reaction rate has been accelerated,while the hydrogen diffusion coefficient decreases obviously.To electrode kinetics,the electrochemical reaction kinetics is mainly controlled by surface reaction at low depth of discharge,and hydrogen diffusion internal of alloy particles at high depth of discharge. |
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| Keywords: | hydrogen storage alloys electrochemical behaviors electrochemical impedance surface reaction hydrogen diffusion coefficient |
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