Crystal structures and electrochemical properties of R1.5Ca1.5MgNi14 (R=Nd, Gd and Er) hydrogen storage alloys
Crystal structures and electrochemical properties of R1.5Ca1.5MgNi14 (R=Nd, Gd and Er) hydrogen storage alloys
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R1.5Ca1.5MgNi14（R=Nd、Gd、Er）储氢合金的晶体结构和电化学性能
DOI：
10.1007/s40242-019-9173-7
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Sun dalin
中科院分区：
文献类型：
--
作者：
Zang Jiahe;Zhang Qing'an;Sun dalin
采用高频感应熔融烧结法制备了Ca3MgNi14、Nd1.5Ca1.5MgNi14、gd1.5 ca1.5 mgni14和er1.5 ca1.5 mgni14合金。通过x射线衍射/Rietveld全光谱拟合，gasousp - c -氢气储存测试和电化学性能测试进行表征和分析。结果表明，所有合金均由gd2co7型3R相和ce2ni7型2H相组成。与Ca3MgNi14相比，Nd1.5Ca1.5MgNi14、gd1.5 ca1.5 mgni14和er1.5 ca1.5 mgni14的储氢容量有所降低，但其吸附和解吸平衡压力明显增加。此外，与Ca3MgNi14相比，r1.5 ca1.5 mgni14合金具有更好的循环稳定性和高倍率放电性能。氢在合金电极中的扩散是影响HRD性能的主要因素。
Ca3MgNi14, Nd1.5Ca1.5MgNi14, Gd1.5Ca1.5MgNi14and Er1.5Ca1.5MgNi14alloys were prepared by high frequency induction melting and sintering. Characterization and analysis were performed by X-ray diffraction/Rietveld full-spectrum fitting, gaseousP-C-Thydrogen storage test and electrochemical properties tests. It can be found that all alloys consist of Gd2Co7-type 3R phase and Ce2Ni7-type 2H phase. Although the hydrogen storage capacities of Nd1.5Ca1.5MgNi14, Gd1.5Ca1.5MgNi14and Er1.5Ca1.5MgNi14decrease to some extent compared to that of Ca3MgNi14, their equilibrium pressures for absorption and desorption increase markedly. Moreover, R1.5Ca1.5MgNi14alloys have better cycling stabilities and high-rate discharge(HRD) properties as compared to Ca3MgNi14. The hydrogen diffusion in alloy electrodes is the main factor to influence the HRD performance.