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Hydrogen Storage Behaviour of Nanocrystalline and Amorphous Mg20Ni10-xCox (x=0~4) Alloys by Melt-Spinning
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Hydrogen Storage Behaviour of Nanocrystalline and Amorphous Mg20Ni10-xCox (x=0~4) Alloys by Melt-Spinning
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National Natural Science Foundations of China (51161015 and 50961009); Natural Science Foundation of Inner Mongolia, China (2011ZD10 and 2010ZD05)

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    摘要:

    為了改善Mg2Ni型合金的貯氫性能，采用Co部分替代合金中的Ni以及快淬工藝制備了納米晶和非晶態(tài)Mg20Ni10-xCox (x=0, 1, 2, 3, 4)貯氫合金。用XRD、SEM、HRTEM分析了鑄態(tài)及快淬態(tài)合金的微觀結(jié)構(gòu)，并測試了合金的氣態(tài)吸/放氫動力學(xué)及電化學(xué)貯氫性能。結(jié)果表明，在快淬無Co合金中沒有形成非晶相，但快淬含Co合金中形成一定量的非晶相。Co替代Ni及快淬處理顯著地改善了合金的氣態(tài)吸放氫性能。同時，Co替代Ni也顯著地提高了快淬態(tài)合金的放電容量和電化學(xué)循環(huán)穩(wěn)定性。

    Abstract:

    In order to improve the hydriding and dehydriding behaviour of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by Co, and melt-spinning technology was used to prepare the Mg20Ni10-xCox (x=0, 1, 2, 3, 4) hydrogen storage alloys. The structures of the as-cast and spun alloys were studied by XRD, SEM and HRTEM. The hydriding and dehydriding kinetics as well as the electrochemical performances of the alloys were measured. The results show that no amorphous phase is detected in the as-spun Co-free alloy, but the as-spun alloys substituted by Co display the presence of an amorphous phase. The substitution of Co for Ni and the melt spinning significantly improve the hydrogen absorption and desorption performances of the as-cast and spun alloys. Meanwhile, the substitution of Co for Ni enhances the discharge capacity and cycle stability of the as-spun alloys dramatically.

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張羊換,郭世海,祁 焱,楊 泰,陳莉翠,許永燕,趙棟梁. Hydrogen Storage Behaviour of Nanocrystalline and Amorphous Mg20Ni10-xCox (x=0~4) Alloys by Melt-Spinning[J].稀有金屬材料與工程,2012,41(11):1881~1886.[Zhang Yanghuan, Guo Shihai, Qi Yan, Yang Tai, Chen Licui, Xu Yongyan, Zhao Dongliang. Hydrogen Storage Behaviour of Nanocrystalline and Amorphous Mg20Ni10-xCox (x=0~4) Alloys by Melt-Spinning[J]. Rare Metal Materials and Engineering,2012,41(11):1881~1886.]
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  • 收稿日期:2011-11-25
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