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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 >Electrochemical performance of AB_2 metal hydride alloys measured at -40 °C
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Electrochemical performance of AB_2 metal hydride alloys measured at -40 °C

机译：-40°C下测量的AB_2金属氢化物合金的电化学性能

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摘要

The low-temperature (-40 °C) electrochemical performance of Y-, Si-, Fe-, Cu-, and Mo-partially substituted AB_2 metal hydride alloys was studied. The surface area and catalytic ability of these alloys were obtained from the double-layer capacitance and the product of the double-layer capacitance and charge-transfer resistance from AC impedance measurement, respectively. With the increase in amount of substitution, the surface areas in these substituted alloys showed different degrees of increase: Y-addi-tion exhibited the largest increase, followed by Si-addition, and then Cu-, Mo-, and Fe-additions. The surface catalytic abilities of Si-containing alloys were the highest and followed by those of Mo-containing alloys. Cu-, Y-, and Fe-additions reduced the surface catalytic ability. The resistance at -40 °C benefited from the incorporations of Si, Mo, and Y, and deteriorated with the incorporations of Cu and Fe. In the best scenario of a single element-substituted AB_2 alloy, the resistance at -40 °C is still higher than that from a commercially available AB_5 alloy. Since the contributions to the low temperature performance of AB_2 alloys from various modifiers are not the same, the combination of several modifiers is possible for further optimization.
机译：研究了Y-，Si-，Fe-，Cu-和Mo部分取代的AB_2金属氢化物合金的低温（-40°C）电化学性能。这些合金的表面积和催化能力分别由双层电容和由交流阻抗测量得到的双层电容与电荷转移电阻的乘积获得。随着取代量的增加，这些取代合金的表面积显示出不同程度的增加：Y含量表现出最大的增长，其次是Si添加，然后是Cu，Mo和Fe添加。含硅合金的表面催化能力最高，其次为含钼合金。铜，-和铁的添加降低了表面催化能力。 -40°C时的电阻受益于Si，Mo和Y的结合，而随着Cu和Fe的结合而降低。在单元素取代的AB_2合金的最佳方案中，-40°C时的电阻仍高于市售AB_5合金的电阻。由于各种改性剂对AB_2合金的低温性能的贡献不尽相同，因此有可能将几种改性剂组合在一起进行进一步优化。

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