کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9760190 | 1498042 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of annealing treatment on structure and electrochemical properties of La0.67Mg0.33Ni2.5Co0.5 alloy electrodes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of annealing treatment on structure and electrochemical properties of La0.67Mg0.33Ni2.5Co0.5 alloy electrodes Effect of annealing treatment on structure and electrochemical properties of La0.67Mg0.33Ni2.5Co0.5 alloy electrodes](/preview/png/9760190.png)
چکیده انگلیسی
La0.67Mg0.33Ni2.5Co0.5 alloys were prepared by induction melting followed by different annealing treatments (1023, 1073, 1123 and 1173 K) for 24 h. Alloy structure and electrochemical properties of different annealed alloys have been studied systematically by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical experiments. Alloy structure analyses show that all of the alloys consisted of complex phases such as (La, Mg)(Ni, Co)3 phase (PuNi3-type, SG: R-3 m), (La, Mg)2(Ni, Co)7 phase (Ce2Ni7-type, SG: P63/mmc), LaMg(Ni, Co)4 phase (MgCu4Sn-type, SG: F-4 3 m) and La(Ni, Co)5 phase (CaCu5-type, SG:P6/mmm). One thousand one hundred and twenty-three kelvin benefited formation of (La, Mg)(Ni, Co)3 phase best. Main phase in alloy became (La, Mg)2(Ni, Co)7 phase at 1173 K annealing treatment. Electrochemical experiments show that absorption/desorption plateau became flatter and wider after annealing treatment, that all of the alloy electrodes exhibited good activation characteristics, that annealing treatment improved discharge capacities of alloy electrodes from 315 mAh gâ1 (as-cast) to 402.5 mAh gâ1 (1173 K). At the same time, cyclic stability of alloy electrodes was also improved with rise of annealing temperature, especially for alloy electrode (S70 = 92.9%) with main phase (La, Mg)2(Ni, Co)7 at 1173 K. As (La, Mg)(Ni, Co)3 phase in alloys increased, high rate dischargeability characteristics were deteriorated. However, alloy electrode with main phase (La, Mg)2(Ni, Co)7 exhibited the best kinetic characteristics. All experiments imply that alloy electrode with main phase (La, Mg)2(Ni, Co)7 possessed excellent overall electrochemical properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 150, 4 October 2005, Pages 247-254
Journal: Journal of Power Sources - Volume 150, 4 October 2005, Pages 247-254
نویسندگان
Faliang Zhang, Yongchun Luo, Jiangping Chen, Ruxu Yan, Long Kang, Jianhong Chen,