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Characteristics of multi-component Ml-based hydrogen storage alloys and their hydride electrodes

Rare Metals 2002年第1期21卷 74-78页

作者： LIQuan'an chenyungui TUMingjing DepartmentofMaterialsScienceandEngineering LuoyangInstituteofTechnologyLuoyang471039China DepartmentofMetalMaterials SichuanUniversitychengdu610065China

A series of multi-component M1-based hydrogen storage alloys witha cobalt atomic ratio of 0.40-0.75 were prepared. The electrochemicalproperties under different charge-discharge conditions and PCTcharaceristics measured by electrochemical method were *** addition of other alloying elements for partial substitution ofCo low- ers the hydrogen equilibrium pressure and discharge capacity,but improves the cycling stability and makes the alloys keep nearlythe same rate discharge capability and high-temperature dischargecapability as those of the compared alloy. The reasons werediscussed.

关键词： rare earth alloy low-Co hydrogen storage alloy metal hydride electrode electrochemical property

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Influence factors of capacity loss after short-time standing of metal-hydride electrode and its EIS model

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Journal of Rare Earths 2013年第8期31卷 772-777页

作者：王倩楠晁栋梁周万海陈云贵吴朝玲 College of Materials Science and Engineering Sichuan University

Considerable irreversible capacity loss was observed after the electrode standing at small state-of-charge （SOC） for only a short term. Influence of SOC, standing time and the replacement elements of LaNis-type hydrogen storage alloys to standing was discussed. Charge-transfer resistance, exchange current density （I0）, and hydrogen diffusion coefficient were determined based on the study of electrochemical impedance spectrum （EIS）, linear polarization （LP） and constant potential step （CPS）, respectively. The oxi- dation of metal Ni on the alloy surface after standing was responsible for the rapid deterioration of capacity, charge-transfer resistance and I0. Galvanostatic, LP, EIS and CPS measurements suggested the presence of an oxide and/or corrosion layer on the alloy surface of raw material and electrode after standing at 0% SOC for 2 d. It was proved that the first small semicircle in high-frequency region of EIS was related to this layer. Novel EIS model in metal hydride electrode was proposed accordingly.

关键词： metal-hydride electrode standing oxide layer EIS model rare earths

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