Electrochemical hydrogen storage properties of non-stoichiometric La0.7Mg0.3−xCaxNi2.8Co0.5 (x = 0-0.10) electrode alloys |
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Authors: | Zhenwei Dong Yaoming WuLiqun Ma Lidong WangXiaodong Shen Limin Wang |
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Affiliation: | a College of Material Science and Engineering, Nanjing University of Technology, Nanjing 210009, China b State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun 130022, China |
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Abstract: | The microstructure and electrochemical hydrogen storage characteristics of La0.7Mg0.3−xCaxNi2.8Co0.5 (x = 0, 0.05 and 0.10) alloys prepared by arc-melting and subsequent powder sintering method are investigated. The electrochemical measurement results show that the cycle stability after 100 charge/discharge cycles first increases from 46.4% (x = 0) to 54.3% (x = 0.05), then decreases to 43.2% (x = 0.10), and the high rate dischargeability increases from 64.5% (x = 0) to 68.5% (x = 0.10) at the discharge current density of 1200 mA/g. The electrochemical impedance spectroscopy analysis indicates that the electrochemical kinetics of the alloy electrodes is improved by increasing Ca. The entire results exhibit that a suitable content of Ca (x = 0.05) can improve the overall electrochemical hydrogen storage characteristics of the alloys. |
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Keywords: | Alloy electrode Hydrogen storage Cycle stability Electrochemical kinetics |
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