Crystal Structures and Electrochemical Properties of R1.5Ca1.5MgNi14(R=Nd, Gd and Er) Hydrogen Storage Alloys

Jiahe Zang; Qing’an Zhang; Dalin Sun

doi:10.1007/s40242-019-9173-7

Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (6) : 1040 -1045. DOI: 10.1007/s40242-019-9173-7

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Crystal Structures and Electrochemical Properties of R_1.5Ca_1.5MgNi₁₄(R=Nd, Gd and Er) Hydrogen Storage Alloys

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Abstract

Ca₃MgNi₁₄, Nd_1.5Ca_1.5MgNi₁₄, Gd_1.5Ca_1.5MgNi₁₄ and Er_1.5Ca_1.5MgNi₁₄ alloys were prepared by high frequency induction melting and sintering. Characterization and analysis were performed by X-ray diffraction/Rietveld full-spectrum fitting, gaseous P-C-T hydrogen 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 Nd_1.5Ca_1.5MgNi₁₄, Gd_1.5Ca_1.5MgNi₁₄ and Er_1.5Ca_1.5MgNi₁₄ decrease to some extent compared to that of Ca₃MgNi₁₄, their equilibrium pressures for absorption and desorption increase markedly. Moreover, R_1.5Ca_1.5MgNi₁₄ alloys 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.

Keywords

Hydrogen storage alloy / Crystal structure / Electrochemical performance / High-rate discharge / Element substitution

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Jiahe Zang, Qing’an Zhang, Dalin Sun. Crystal Structures and Electrochemical Properties of R_1.5Ca_1.5MgNi₁₄(R=Nd, Gd and Er) Hydrogen Storage Alloys. Chemical Research in Chinese Universities, 2019, 35(6): 1040-1045 DOI:10.1007/s40242-019-9173-7

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