首页|Structure and electrochemical properties of La1-xMgxNi2.8Co0.4Mn0.1Al0.2(x = 0.25,0.30,0.33)hydrogen storage alloys

Structure and electrochemical properties of La1-xMgxNi2.8Co0.4Mn0.1Al0.2(x = 0.25,0.30,0.33)hydrogen storage alloys

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La1-xMgxNi28Co0.4Mn0.1Al0.2(x = 0.25,0.30,0.33)alloys were prepared by induction melting followed by annealing treatments(1,073 K)for 10 h.The structure and electrochemical properties of La1-xMgxNi2.8 Co0.4Mn0.1Al0.2(x = 0.25,0.30,0.33)hydrogen storage alloys were investigated by X-ray powder diffraction(XRD)and electrochemical measurement methods.XRD results reveal that all the alloys mainly consist of LaNi5 phase and La2Ni7 phase.The electrochemical experiments demonstrate that the substitution of Mg for La can increase the maximum discharge capacity and improve the high-rate dischargeability of the alloy electrodes.The high-rate dis-chargeability of alloy electrodes increases from 39.4％to 63.1％with x increasing from 0.25 to 0.33 at discharge current density of 1,500 mA•g-1.However,the addition of Mg reduces the cycling stability of the electrodes.Fur-thermore,the results obtained from the electrochemical impedance spectroscopy and linear polarization measure-ments show that the hydriding kinetics on the hydrogen storage alloys are controlled by charge-transfer step.

Hydrogen storage alloyElectrochemical propertiesHigh-rate dischargeabilityElectrochemical impedance spectroscopy

Si Li、Huai-Ying Zhou、Zhong-Min Wang、Jian-Qiu Deng、Qing-Rong Yao

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School of Material Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China

This study was financially supported by the National Natural Science Foundation of ChinaNatural Foundation of Guangxi ProvinceNatural Foundation of Guangxi Province

51261003Nos.2012GXNS FGA0600022011GXNSFD018004

2020

10.1007/s12598-014-0322-3

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDCSCDSCIEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2020.39(12)
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