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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Investigation of microstructure and electrochemical properties of Ti_(0.8)Zr_(0.2)V_(2.7)Mn_(0.5 + x)Cr_(0.8)Ni_(1.5 - x) hydrogen storage alloys
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Investigation of microstructure and electrochemical properties of Ti_(0.8)Zr_(0.2)V_(2.7)Mn_(0.5 + x)Cr_(0.8)Ni_(1.5 - x) hydrogen storage alloys

机译：Ti_（0.8）Zr_（0.2）V_（2.7）Mn_（0.5 + x）Cr_（0.8）Ni_（1.5-x）储氢合金的组织和电化学性能研究

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摘要

The effects of partial substitution of Mn for Ni on the structural and electrochemical properties of Ti_(0.8)Zr_(0.2)V_(2.7)Mn_(0.5 + x)Cr_(0.8)Ni_(1.5 - x) (x = 0.0-0.4) hydrogen storage alloys have been systematically investigated. It is found by XRD and Rietveld analysis that all of the alloys consist of a C14 Laves phase with a hexagonal structure and a V-based solid solution phase with a BCC structure. With increasing x, the abundance of the C14 Laves phase increases, but the abundance of the V-based phase decreases progressively. The electrochemical measurements indicate that the maximum discharge capacity of the alloy electrode increases first from 324.8 mAh/g (x = 0.0) to 356.4 (x = 0.2) and then decreases to 310.0 mAh/g (X = 0.4). But the cyclic stability of the alloy electrode deteriorates with increasing Mn content. Moreover, the results of electrochemical impedance spectroscopy (EIS), linear polarization, anodic polarization and potentiostatic discharge tests indicate that the exchange current density I_0, the limiting current density I_L, and the hydrogen diffusion coefficient D all increase first and then decrease with increasing x. The high rate dischargeability (HRD) of the alloy electrode varies in the same manner. An optimum overall performance is obtained when x = 0.1.
机译：Mn部分取代Ni对Ti_（0.8）Zr_（0.2）V_（2.7）Mn_（0.5 + x）Cr_（0.8）Ni_（1.5-x）（x = 0.0-0.4）的结构和电化学性能的影响）储氢合金已得到系统地研究。通过XRD和Rietveld分析发现，所有合金均由具有六方结构的C14 Laves相和具有BCC结构的V型固溶体相组成。随着x的增加，C14 Laves相的丰度增加，但基于V的相的丰度逐渐降低。电化学测量表明，合金电极的最大放电容量首先从324.8 mAh / g（x = 0.0）增加到356.4（x = 0.2），然后降低到310.0 mAh / g（X = 0.4）。但是，随着Mn含量的增加，合金电极的循环稳定性变差。此外，电化学阻抗谱（EIS），线性极化，阳极极化和恒电位放电测试的结果表明，交换电流密度I_0，极限电流密度I_L和氢扩散系数D都首先增加，然后随着x的增加而减小。合金电极的高倍率放电率（HRD）以相同的方式变化。当x = 0.1时，可获得最佳的总体性能。

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