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Effect of praseodymium substitution for lanthanum on structure and properties of La_(0.65-x)Pr_xNd_(0.12)Mg_(0.23)ni_(3.4)Al_(0.1)(x=0.00–0.20) hydrogen storage alloys

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Journal of Rare Earths 2009年第2期27卷 244-249页

作者：闫慧忠孔繁清熊玮李宝犬李金 Ruike National Engineering Research Center of RE Metallurgy & Functional Materials Baotou 014030China Baotou Research Institute of Rare Earth Baotou 014030China

In order to investigate the effect of substituting La with Pr on structural and hydrogen storage properties of La-Mg-ni system （AB3.5-type） hydrogen storage alloys, a series of La0.65-xPrxNd0.12Mg0.23ni3.4Al0.1（x=0, 0.10, 0.15, 0.2） hydrogen storage alloys were prepared. X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy dispersive spectrometer （EDS） analyses revealed that two alloys （x=0.0 and 0.10） were composed of （La,Mg）2（ni,Al）7 phase, La（ni,A1）5 phase and （La,Mg）ni2 phase, while other alloys （x=0.15 and 0.20） consisted of （La,Mg）2（ni,A1）7 phase, La（ni,A1）5 phase, （La,Mg）ni2 phase and （La,Mg）（ni,A1）3 phase. All alloys showed, however, only one pressure plateau in P-C isotherms. The Pr/La ratio in alloy composition influenced hydrogen storage capacity and kinetics properties. Electrochemical studies showed that the discharge capacity decreased from 360 mAh/g （x=-0.00） to 335 mAh/g （x=-0.20） as x increased. But the high-rate dischargeability （HRD） of alloy electrodes increased from 26% （x=0.00） to 56% （x=-0.20） at a discharge current density of Id=1800 mA/g. Anode polarization measurements were done to further understand the electrochemical kinetics properties after Pr substitution.

关键词： hydrogen storage alloy La-Mg-ni system metal hydrides mh/ni batteries electrochemical properties rare earths

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Electrochemical properties of LaFeO3-rGO composite

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Progress in Natural Science:Materials International 2017年第1期27卷 88-92页

作者： Yongjie Yuan Zhentao Dong Yuan Li Lu Zhang Yumeng Zhao Bo Wang Shumin Han State Key Laboratory of Metastable Materials Science and Technology Yanshan University College of Environmental and Chemical Engineering Yanshan University

LaFeO3-xwt% r GO composite（x = 8, 10, 12） was synthesized by ultraphonic stirring and lyophilization ***, TEM and XRD results show that the perovskite-type LaFeO3was dispersed by rGO to form special porous structure due to the gauze-shaped wrinkles and folds structure of rGO. It was found that the special porous structure can effectively increase the specific surface area and suppress particle aggregation of LaFeO3, thus improving the electrical conductivity and appreciably enhancing the electrochemical properties of LaFeO3. As compared with LaFeO3, the maximum discharge capacity of the composite（x=10） increased from 209.5 mAhg–1to 334.6 mAhg–*** High rate dischargeability at a discharge current density of 1500 mAg–1（HRD1500） and the capacity retention rate after 100 charge/discharge cycles（S100） of the composite increased by 9% and 17%, respectively.

关键词： mh/ni batteries LaFeO3 RGO Composite Electrochemical property

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Improved Electrochemical Performance of Surface-Modified Metal Hydride Electrodes

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Journal of Beijing Institute of Technology 2005年第4期14卷 433-437页

作者：杨凯吴锋陈实张存中 School of Chemical Engineering and Environment Beijing Institute of Technology Beijing100081 China

A novel plating process was applied to the surface modification of the metal hydride （mh） electrode of the mh/ni batteries. The electrode was plated with a thin nickel film about 0.1 μm thick by using multi-arc ion plating technique. The X-ray diffraction （XRD）, X ray photoelectron spectroscopy （XPS） and scanning electron microscope （SEM） were used to analyze the electrodes. Influence of the surface modification on the performance of the mh/ni batteries was studied. It is shown that the surface modification could enhance the electrode eondue tivity and decrease the batteries ohimie resistance by 28.2 %. After surface modification, the discharge capacity of the batteries at 5C （8.5 A） is increased by 212 mA· h and discharge voltage is increased by 0.09 V. The surface modification also improves the cyclic durability of the batteries. The inner pressure of the batteries with modified electrode during overcharging is much lower than that with unmodified electrode. The experimental results demonstrate that this process is an effective way for the surface modification of the electrode of mh/ni batteries.

关键词： surface modification multi-arc ion plating technique electrode mh/ni batteries

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