Effect of heteropolyacid treatment on the electrochemical properties of La-Y-Ni system A2B7-type hydrogen storage alloy performance

Abstract

Abstract: The annealed state A₂B₇ type La_0.33Y_0.67Ni_3.23Mn_0.17Al_0.1 hydrogen storage alloy was prepared,and the annealed alloy was impregnated with phosphotungstic acid (H₃PW₁₂O₄₀), (phosphotungstic acid (TPA)) aqueous solution. The effects of TPA treatment on the organization, surface morphology, composition , and the electrochemical properties of the alloy were investigated. The results showed that corrosive pits or micropores are formed on the surface of the TPA-treated alloy, and a Ni-rich layer containing tungstate ions with high oxidation valence is formed on the surface of the alloy. The TPA treatment can significantly improve the electrochemical performance of the alloy electrode. The exchange current density I₀ of the alloy electrode is the largest when the concentration of TPA is 0.1 mol/L. At this time, the alloy electrode has the largest 1C discharge capacity (364 mAh/g), and its capacity retention rate S₁₀₀ and high-current discharge performance HRD₉₀₀ are 93.23% and 81.92%, respectively, which are significantly better than those of the untreated alloy electrode with S₁₀₀(88.12%) and HRD₉₀₀(76.05%). The electron transfer impedance at the interface between the electrode surface and the electrolyte solution before and after the TPA treatment is a controlling step affecting the electrode's high-magnification discharge electrodynamic performance.

Key words: La-Y-Ni system A₂B₇ type hydrogen storage alloy, heteropoly acids, surface treatment

CLC Number:

TG139.7

WANG Cheng-jun, LEI Ming, SHEN Bing-jin, ZHANG Qian-kun, LUO Yong-chun. Effect of heteropolyacid treatment on the electrochemical properties of La-Y-Ni system A₂B₇-type hydrogen storage alloy performance[J]. Journal of Lanzhou University of Technology, 2025, 51(1): 25-33.

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URL: https://journal.lut.edu.cn/EN/

https://journal.lut.edu.cn/EN/Y2025/V51/I1/25

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Effect of heteropolyacid treatment on the electrochemical properties of La-Y-Ni system A₂B₇-type hydrogen storage alloy performance

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