| La_(0.7)Pr_(0.15)Nd_(0.05)Mg_(0.3)Ni_(3.3-x)Co_(0.2)Al_(0.1)(Co_(0.75)Mn_(0.25))_x(x=0.0,0.2,0.4,0.6)的电化学性能研究 |
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| 引用本文： | 覃铭,熊凯,蓝志强,刘奕新,郭进.La_(0.7)Pr_(0.15)Nd_(0.05)Mg_(0.3)Ni_(3.3-x)Co_(0.2)Al_(0.1)(Co_(0.75)Mn_(0.25))_x(x=0.0,0.2,0.4,0.6)的电化学性能研究[J].中国稀土学报,2011,29(3). |
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| 作者姓名： | 覃铭 熊凯 蓝志强 刘奕新 郭进 |
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| 作者单位： | 1. 广西大学物理科学与工程技术学院,广西,南宁,530004;百色学院物理与电子工程系,广西,百色,533000
2. 广西大学物理科学与工程技术学院,广西,南宁,530004 |
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| 基金项目： | 国家自然科学基金(50861003,51071054); 广西大学有色金属及材料加工新技术教育部重点实验室开放基金(GXKFJ-09); 百色学院科研项目(2010KB15,GBK2010008,GBK2010007)资助 |
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| 摘 要： | 在Ar气保护下用悬浮熔炼制备La0.7Pr0.15Nd0.05Mg0.3N i3.3-xCo0.2A l0.1(Co0.75Mn0.25)x(x=0.0,0.2,0.4,0.6)合金,系统研究了Co和Mn对合金储氢性能和电化学性能的影响。XRD相分析表明,合金相主要由(La,Pr)(N i,Co)5,LaMg2N i9,(La,Nd)2N i7和LaN i3相组成;添加Co和Mn后合金中(La,Pr)(N i,Co)5,(La,Nd)2N i7和LaN i3相晶胞体积增加,LaMg2N i9相晶胞体积变小。合金放氢PCT曲线测试表明,随着合金中Co和Mn含量的增加,合金吸氢量先减小后增加,放氢平台压下降,合金氢化物稳定性增加。合金电极电化学性能测试表明,添加Co和Mn使合金电极放电容量减小,容量保持率S100从53.2%(x=0.0)增加到63.0%(x=0.6),合金电极的电循环稳定性增强,高倍率放电性能HRD1500先增加后减小。此外,合金电极的极化电阻先减小后增加,交换电流密度、循环伏安特性阳极峰电流密度和极限电流密度先增加后减小,合金内氢原子扩散系数先增加后减小,表明添加适量的Co和Mn可以提高合金电...
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| 关 键 词： | 储氢合金 PCT性能 电化学性能 稀土 |
Electrochemical Properties of La_(0.7)Pr_(0.15)Nd_(0.05)Mg_(0.3)Ni_(3.3-x)Co_(0.2)Al_(0.1)(Co_(0.75)Mn_(0.25))_x(x=0.0, 0.2, 0.4, 0.6) Alloys |
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| Qin Ming,Xiong Kai,Lan Zhiqiang,Liu Yixin,Guo Jin.Electrochemical Properties of La_(0.7)Pr_(0.15)Nd_(0.05)Mg_(0.3)Ni_(3.3-x)Co_(0.2)Al_(0.1)(Co_(0.75)Mn_(0.25))_x(x=0.0, 0.2, 0.4, 0.6) Alloys[J].Journal of the Chinese Rare Earth Society,2011,29(3). |
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| Authors: | Qin Ming Xiong Kai Lan Zhiqiang Liu Yixin Guo Jin |
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| Institution: | QinM ing1,2,X iong Kai1,Lan Zhiq iang1,Liu Y ixin1,Guo Jin1(1.College ofPhysics Science and Technology,Guangxi University,Nanning 530004,China,2.Departm ent ofPhysics and Electronic Engineering,Baise University,Baise 533000,China) |
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| Abstract: | La0.7Pr0.15Nd0.05Mg0.3N i3.3-xCo0.2A l0.1(Co0.75Mn0.25)x(x= 0.0,0.2,0.4,0.6) alloys were prepared by magnetic levitation melting underAr atmosphere.The effects ofCo andMn on the hydrogen storage properties and electrochem ical characteristics were stud ied systematically.The XRD results showed that the alloy phase was mainly composed of(La,Pr)(N i,Co)5,LaMg2N i9,(La,Nd)2N i7and LaN i3 phase.W ith the add ition of Co and Mn,the cell vol-umes of(La,Pr)(N i,Co)5,(La,Nd)2N i7and LaN i3 phase increased and that ... |
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| Keywords: | hydrogen storage alloy PCT properties electrochem ical characteristics rare earths |
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