Citation: JIANG Wan-Ting, LUO Yong-Chun, ZHAO Lei, DEN An-Qiang, ZHANG Guo-Qing. Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A₂B₇-Type Hydrogen Storage Alloys[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(10): 1817-1825. doi: 10.11862/CJIC.2018.222 shu

Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A₂B₇-Type Hydrogen Storage Alloys

1.
Department of Materials Science and Engineer, Lanzhou University of Technology, Lanzhou 730050, China
2.
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

Corresponding author: LUO Yong-Chun, luoyc@lut.cn
Received Date: 2 May 2018
Revised Date: 29 June 2018

Figures(12)

The R-Y-Ni based A₂B₇-type R_0.3Y_0.7Ni_3.25Mn_0.15Al_0.1 (R=Y, La, Pr, Ce, Nd, Gd, Sm) alloys were prepared by vacuum arc melting and followed by annealing treatment. The effects of rare earth element R on the microstructure, hydrogen storage and electrochemical properties of the alloys were investigated systematically. XRD and SEM-EDS analysis showed that the annealed alloys mainly composed of Ce₂Ni₇-type main phases, minor PuNi₃-type and CaCu₅-type phases. The lattice constants a, c and cell volume V of the Ce₂Ni₇-type main phases decreased in sequence with the decreasing radius of R atoms. The annealed alloys obviously presented a hydrogen absorption/desorption platform, the maximum hydrogen storage capacities and the equilibrium hydrogen absorption pressures (P_eq) at room temperature were in the range of 1.17%~1.48% (w/w) and 0.037~0.194 MPa, respectively. Electrochemical analysis showed that the electrochemical activation performance was excellent. The heterogeneity of microstructure and electrochemical oxidation corrosion of rare earth elements were main reason that affected the cycling stability of alloy electrodes. For all the alloys, the R=La alloys exhibited the highest electrochemical discharge capacity of 389.2 mAh·g^-1 and the best cyclic stability S₁₀₀=85.7% (charge/discharge after 100 cycles). The high rate discharge ability HRD₉₀₀ (current density was 900 mA·g^-1) of the alloys was 71.05%~86.94% and the control step of the reaction kinetics was mainly controlled by the diffusion rate of the hydrogen atom in the alloys.
- R-Y-Ni based A₂B₇-type hydrogen storage alloys,
- rare earth elements,
- microstructure,
- hydrogen storage,
- electrochemical properties
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A2B7-Type Hydrogen Storage Alloys

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通讯作者: 陈斌, bchen63@163.com

Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A₂B₇-Type Hydrogen Storage Alloys