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納米晶和非晶Mg20-xLaxNi10(x=0-6)貯氫合金的貯氫行為
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Hydrogen Storage Behaviours of Nanocrystalline and Amorphous Mg20-xLaxNi10(x=0-6) Hydrogen Storage Alloys
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“863” Program (2007AA03Z227); National Natural Science Foundations of China (50871050 and 50701011); Natural Science Foundation of Inner Mongolia of China (200711020703); High Education Science Research Project of Inner Mongolia of China (NJzy08071)

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    摘要:

    用快淬技術(shù)制備了Mg2Ni型貯氫合金，合金的名義成分為Mg20-xLaxNi10 (x = 0, 2, 4, 6)。用XRD、SEM、HRTEM分析了合金的微觀結(jié)構(gòu)。發(fā)現(xiàn)不含La的快淬合金中沒有非晶相，但含La快淬合金中顯示以非晶相為主。當(dāng)La含量x≤2時，鑄態(tài)合金的主相為Mg2Ni相，但隨著La含量的進(jìn)一步增加，鑄態(tài)合金的主相改變?yōu)?La,Mg)Ni3+LaMg3相。應(yīng)用Sieverts設(shè)備研究了鑄態(tài)及快淬態(tài)合金的吸放氫量及動力學(xué)，結(jié)果表明，x=2的合金吸放氫量及動力學(xué)隨淬速的增加而增加，但對于x=6的合金，結(jié)果是相反的。電化學(xué)測試結(jié)果表明，x=2合金的放電容量隨淬速的增加而增加，而對于x=6合金，結(jié)果也是相反的?？齑泔@著地提高了x=2, 6合金的循環(huán)穩(wěn)定性

    Abstract:

    Mg2Ni-type hydrogen storage alloys with nominal composition Mg20-xLaxNi10 (x = 0, 2, 4, 6) were prepared by melt spinning. The microstructures of the alloys were studied by XRD, SEM and HRTEM. It is found that no amorphous phase formed in the as-spun La-free alloy, but the as-spun alloys containing La mainly held a major amorphous phase. When La content x≤2, the major phase in the as-cast alloys is Mg2Ni phase, but with the further increase of La content, the major phase of the as-cast alloys changes into (La,Mg)Ni3+LaMg3 phases. The hydrogen absorption and desorption kinetics of the as-cast and spun alloys were measured using an automatically controlled Sieverts apparatus, indicating that the hydrogen absorption and desorption capacity and the kinetics of the x = 2 alloy clearly increase with rising of spinning rate, but a contrary result is obtained for x = 6 alloy. The electrochemical measurement shows that the discharge capacity of the x = 2 alloy grows with rising of spinning rate, but it is a completely contrary result for x = 6 alloy. The melt spinning significantly improves the cycle stability of the x = 2 and 6 alloys

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張羊換,李保衛(wèi),任慧平,郭世海,祁 焱,王新林.納米晶和非晶Mg20-xLaxNi10(x=0-6)貯氫合金的貯氫行為[J].稀有金屬材料與工程,2010,39(8):1317~1322.[Zhang Yanghuan, Li Baowei, Ren Huiping, Guo Shihai, Qi Yan, Wang Xinlin. Hydrogen Storage Behaviours of Nanocrystalline and Amorphous Mg20-xLaxNi10(x=0-6) Hydrogen Storage Alloys[J]. Rare Metal Materials and Engineering,2010,39(8):1317~1322.]
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  • 收稿日期:2009-08-29
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