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Investigation on the structure and electrochemical properties of La-Ce-Mg-Al-Ni hydrogen storage alloy
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نویسنده
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qiao y. ,xi j. ,zhao m. ,shao g. ,luo y. ,wang l.
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منبع
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journal of chemistry - 2013 - دوره : 2013 - شماره : 0
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چکیده
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Structure and electrochemical characteristics of la0.96ce 0.04mg0.15al0.05ni2.8 hydrogen storage alloy have been investigated. x-ray diffraction analyses reveal that the la0.96ce0.04mg0.15al0.05ni 2.8 hydrogen storage alloy consisted of a (la,mg)ni3 phase with the rhombohedral puni3-type structure and a lani 5 phase with the hexagonal cacu5-type structure. tem shows that the alloy is multicrystal with a lattice space 0.187 nm. eds analyse shows that the content of mg is 3.48% (atom) which coincide well with the designed composition of the electrode alloy. electrochemical investigations show that the maximum discharge capacity of the alloy electrode is 325 mah g-1. the alloy electrode has higher discharge capacity within the discharge current density span from 60 ma g-1 to 300 ma g-1. electrochemical impedance spectroscopy measurements indicate that the charge transfer resistance r t on the alloy electrode surface and the calculated exchange current density i 0 are 0.135 ω and 1298 ma g-1,respectively; the better eletrochemical reaction kinetic of the alloy electrode may be responsible for the better high-rate dischargeability. © 2013 yuqing qiao et al.
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آدرس
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state key laboratory of rare earth resources utilization,changchun institute of applied chemistry,cas,changchun 130022,china,college of environmental and chemical engineering,yanshan university,qinhuangdao, China, college of environmental and chemical engineering,yanshan university,qinhuangdao, China, college of environmental and chemical engineering,yanshan university,qinhuangdao, China, college of environmental and chemical engineering,yanshan university,qinhuangdao, China, department of materials science and engineering,lanzhou university of technology,lanzhou, China, state key laboratory of rare earth resources utilization,changchun institute of applied chemistry,cas, China
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Authors
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