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元素取代和磁熱處理對La0.67Mg0.33Ni3-xMx(M=Co,Cu)(x=0,0.5)合金貯氫性能的影響
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國家科技部“863”計(jì)劃（2007AA05Z118）；教育部全國優(yōu)秀博士學(xué)位論文作者專項(xiàng)基金（200746）；長江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃（IRT0739）


Effects of Element Substitution and Magnetic-Heat Treatment on Hydrogen Storage Properties of La0.67Mg0.33Ni3-xMx(M=Co,Cu)(x=0,0.5) Alloys
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    摘要:

    研究了Co和Cu取代Ni以及磁熱處理對La0.67Mg0.33Ni3-xMx(M=Co,Cu)(x=0,0.5)合金吸放氫反應(yīng)熱力學(xué)和動力學(xué)性能的影響。結(jié)果表明，Ni被Co和Cu元素部分替代后，合金的吸放氫量增大，放氫溫度降低，吸放氫特征時間（tc）減小，吸放氫過程中的擴(kuò)散活化能降低。磁熱處理明顯地提高了3種鑄態(tài)合金的吸氫量，增大了吸放氫平臺寬度，改善了合金的吸放氫動力學(xué)性能，其中磁熱處理對La0.67Mg0.33Ni2.5Co0.5合金改性效果最好，吸放氫量分別為1.40%和1.32%（質(zhì)量分?jǐn)?shù)，下同），放氫峰所對應(yīng)的溫度為77.8 ℃，吸放氫特征時間“tc”為91.4和379.3 s，吸放氫擴(kuò)散活化能分別為16.3和23.3 kJ/mol。

    Abstract:

    The effects of the substitution of Co and Cu for Ni and magnetic-heat treatment on the thermodynamics and kinetics properties of hydriding/dehydriding reaction for La0.67Mg0.33Ni3-xMx (M=Co,Cu)(x=0,0.5) hydrogen storage alloys were studied. Results show that after the partial substitution of Co and Cu for Ni, the hydrogen absorption/desorption capacity of the alloys is increased, and the temperature of endothermic peak, characteristic time (tc) of hydriding/dehydriding reaction and the activation energy are decreased. The magnetic-heat treatment improves performances of La-Mg-Ni type alloys, including hydrogen absorption capacity, the hydriding/dehydriding platform width and the hydriding/dehydriding kinetics. The thermodynamic and kinetic property of magnetic-heated La0.67Mg0.33Ni2.5Co0.5 alloy is excellent. It can absorb 1.40 wt% H and desorb 1.32wt% H. Its DSC measurement shows endothermic peak of 77.8 oC. The characteristic time (tc) of hydriding/dehydriding reaction is 91.4 and 379.3 s. The hydriding/dehydriding activation energy is calculated to be 16.3 and 23.3 kJ/mol by the Chou model.

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劉素霞,任雁秋,張捷宇,李 謙,周國治,趙顯久,吳廣新.元素取代和磁熱處理對La0.67Mg0.33Ni3-xMx(M=Co, Cu)(x=0,0.5)合金貯氫性能的影響[J].稀有金屬材料與工程,2011,40(4):655~660.[Liu Suxia, Ren Yanqiu, Zhang Jieyu, Li Qian, Zhou Guozhi, Zhao Xianjiu, Wu Guangxin. Effects of Element Substitution and Magnetic-Heat Treatment on Hydrogen Storage Properties of La0.67Mg0.33Ni3-xMx(M=Co, Cu)(x=0,0.5) Alloys[J]. Rare Metal Materials and Engineering,2011,40(4):655~660.]
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  • 收稿日期:2010-04-27
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