Microstructure and electrochemical properties of LaNi4–xFeMnx (x=0–0.8) hydrogen storage alloys |
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| Authors: | Heng YANG Yungui CHEN Mingda TAO Chaoling WU |
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| Affiliation: | College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
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| Abstract: | In order to reduce the cost of LaNi5 based hydrogen storage alloys, effect of substitution of Mn for Ni on structural and electrochemical properties of LaNi4–xFeMnx (x=0–0.8) hydrogen storage alloys was studied systematically. X-ray diffraction (XRD) and scanning electron microscope (SEM) showed that LaNi5 and La2Ni7 phases were invariably present in all alloy samples, and when x≥0.4, (Fe, Ni) phase was observed. Electrochemical studies revealed that the discharge capacity reached a maximum value of 306.4 mAh/g when x=0.2 and the cycling stability decreased with the increase of x. With the increase of Mn content, hydrogen diffusion coefficient decreased, whereas high rate discharge-ability (HRD) and exchange current density first increased slowly when x≤0.2 and then decreased markedly when x=0.8, indicating that electrochemical reaction on the surface of alloy electrodes had strong influence on kinetic property. |
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| Keywords: | hydrogen storage materials electrochemical properties Co-free AB5-type alloy rare earths |
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