Hydrogen absorption–desorption features and degradation mechanism of ErNi3 compound
Hydrogen absorption–desorption features and degradation mechanism of ErNi3 compound
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DOI：
10.1016/j.jallcom.2013.09.153
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发表时间：
2014-02
影响因子：
6.2
通讯作者：
S. Xie;Z. Chen;Li Yibu;T. Si;D. Liu;Q. Zhang
中科院分区：
文献类型：
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作者：
S. Xie;Z. Chen;Li Yibu;T. Si;D. Liu;Q. Zhang
详细研究了ErNi 3化合物的吸放氢特性和降解机理。发现在P-C等温线上存在两个平台，低的一个对应于ErNi_3 H_（1.3），高的一个对应于ErNi_3 H_（1.4）。它们在还原过程中的焓变分别为−27.42和−23.51 kJ/mol H2。但在吸放氢循环过程中，由于ErNi 3部分分解为ErNi 2和ErNi 5，同时残留的H原子增加了主晶格应变，从而导致ErNi 3的循环性能变差。
The hydrogen absorption–desorption features and degradation mechanism of ErNi3compound are investigated in detail. It is fount that two plateaus exist in theP–Cisotherms where the lower one corresponds to ErNi3H∼1.3and the higher one to ErNi3H∼4. Their enthalpy changes are −27.42 and−23.51 kJ/mol H2, respectively, in hydriding process. During hydrogen absorption–desorption cycles, however, ErNi3shows a bad cycling performance which is attributed to partial decomposition of ErNi3into ErNi2and ErNi5as well as increase of host-lattice strain due to the remained H atoms.