席夫碱对La-Mg-Ni基储氢合金电化学性能的影响

doi:10.11944/j.issn.1000-0518.2016.07.150363

摘要/Abstract

摘要：

为提高La-Mg-Ni基储氢合金La_0.73Ce_0.18Mg_0.09Ni_3.20Al_0.21Mn_0.10Co_0.60的电化学性能,由5-溴水杨酸和苯胺合成了一种席夫碱作为表面改性剂,对储氢合金进行表面处理。从紫外与红外图谱可知,合成了目标席夫碱。添加1%席夫碱后,合金的相结构没有改变。与未添加席夫碱的合金电极相比,电极的最大放电容量略有下降,但50次充放电循环后合金电极的容量保持率有较大幅度提高,添加5%席夫碱的电极容量保持率从63%提高到75%,高倍率放电性能也有增加。经表面处理后,合金电极的交换电流密度I₀与极限电流密度I_L均有大幅度提高,动电位极化曲线也表明合金电极的抗腐蚀能力变强。以上结果均表明,添加少量席夫碱有助于改善储氢合金电极的电化学性能。

关键词: 席夫碱, 储氢合金, 电化学性能

Abstract:

To improve the electrochemical properties of La-Mg-Ni-based hydrogen storage alloy La_0.73Ce_0.18Mg_0.09Ni_3.20Al_0.21Mn_0.10Co_0.60, a kind of Schiff base was synthesized and added to the alloy as a surface modifier. According to the results of UV and infrared spectroscopies, the phase structure of the alloy does not change after adding this Schiff base. Compared with the original alloy, the maximum discharge capacity decreases somewaht. The cycle stability of the alloy electrodes with 5% addition of Schiff base is improved from original 63% to 75% after 50 cycles, and the high rate discharge performance is improved also. After surface treatment, the exchange current density I₀ and the limiting current density I_L increases obviously. The potentiodynamic polarization curves of the alloy electrodes indicate that the corrosion resistance is increased. The results above suggest that the addition of small amount of Schiff base contributes to improving the electrochemical properties of the hydrogen storage alloy.

Key words: Schiff base, hydrogen storage alloy, electrochemical properties

王新颖, 黄红霞, 谢文强, 孔翔飞, 于文婉. 席夫碱对La-Mg-Ni基储氢合金电化学性能的影响[J]. 应用化学, 2016, 33(7): 813-819.

WANG Xinying, HUANG Hongxia, XIE Wenqiang, KONG Xiangfei, YU Wenwan. Effect of Schiff Base on Electrochemical Properties of La-Mg-Ni-based Hydrogen Storage Alloy[J]. Chinese Journal of Applied Chemistry, 2016, 33(7): 813-819.

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