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硼添加對La-Mg-Ni-Co系貯氫電極合金的微結(jié)構(gòu)及電化學(xué)性能的影響
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Effects of Boron Addition on Structural and Electrochemical Properties of La-Mg-Ni-Co System Hydrogen Storage Electrode Alloys
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Supported by the Program for New Century Excellent Talents in University (NCET-06-0519)

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    摘要:

    系統(tǒng)研究了貯氫電極合金La0.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2Bx (x=0，0.02，0.04，0.08)的微結(jié)構(gòu)與電化學(xué)性能。XRD結(jié)果顯示，所有合金均由(La, Mg)Ni3相與LaNi5相組成，B含量的增加導(dǎo)致(La, Mg)Ni3相的豐度不斷增加，相應(yīng)地LaNi5相的豐度逐漸下降。此外，合金的晶格參數(shù)與晶胞體積均隨B含量的增加而減小。電化學(xué)測試分析表明，B的添加可以顯著改善合金電極的高倍率放電性能，當(dāng)B含量為0.04時達(dá)到最佳。微量B的加入對合金的循環(huán)穩(wěn)定性能與活化性能影響很小，但降低合金電極的最大放電容量。此外還采用線性極化與陽極極化對合金電極的動力學(xué)性能進(jìn)行了進(jìn)一步研究

    Abstract:

    The structural and electrochemical properties of La0.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2Bx (x=0-0.08) hydrogen storage electrode alloys were investigated systematically. The results from XRD show that all of the alloys consist of a (La, Mg)Ni3 phase and a LaNi5 phase. With the increase of B content, the abundance of the (La, Mg)Ni3 phase increases, accordingly that of the LaNi5 phase decreases, and the cell volumes of the two phases decrease. Electrochemical studies indicate that B addition can effectively improve the high rate dischargeability (HRD) of the alloy electrode, and the optimal value of HRD1000 reaches 57.1% as x being 0.04. With the addition of small amount of B, the cycling stability and activation properties of the alloy electrodes keep almost unchanged, but the maximum discharge capacity (Cmax) decreases. In addition, the electrochemical kinetics investigations including the linear polarization and anodic polarization were also performed in detail

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苗 鶴,高明霞,李丹楓,徐 峰,林 燕,鐘 凱,潘洪革.硼添加對La-Mg-Ni-Co系貯氫電極合金的微結(jié)構(gòu)及電化學(xué)性能的影響[J].稀有金屬材料與工程,2009,38(2):193~197.[Miao He, Gao Mingxia, Li Danfeng, Xu Feng, Lin Yan, Zhong Kai, Pan Hongge. Effects of Boron Addition on Structural and Electrochemical Properties of La-Mg-Ni-Co System Hydrogen Storage Electrode Alloys[J]. Rare Metal Materials and Engineering,2009,38(2):193~197.]
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  • 收稿日期:2008-10-20
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