کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1523498 | 1511830 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Improved activation and hydrogen storage properties of a Mg85Ni15 melt-spun alloy via surface treatment with NH4+ solution Improved activation and hydrogen storage properties of a Mg85Ni15 melt-spun alloy via surface treatment with NH4+ solution](/preview/png/1523498.png)
An amorphous Mg85Ni15 melt-spun hydrogen storage alloy, processed by submersion in an aqueous solution of NH4+, is able to absorb nearly 5 mass% hydrogen at 473 K during the first hydrogenation cycle. The nanocrystalline microstructure formed during devitrification of the metallic glass is preserved by the lower required activation temperature of the NH4+-treated material compared to the as-spun material; and the kinetics of subsequent absorption/desorption cycles at 573 K are dramatically improved. The material activated at 473 K exhibits a decrease in hydride decomposition temperature by 30 K, observed via DSC and TPD experiments, compared to a sample activated at 573 K. The NH4+-treatment of a glassy alloy presented here provides a practical alternative to ball milling for forming a nanocrystalline material and facilitating activation, requiring much less time and a more commercially scalable option.
► A Mg85Ni15 alloy is processed for hydrogen storage using aqueous solution of NH4+.
► NH4+-treatment allows the material to be activated at 473 K, absorbing 5 mass% H.
► Improvements in activation kinetics are comparable to those achieved by ball milling.
► DSC and calculations demonstrate improved thermodynamics due to capillarity effects.
Journal: Materials Chemistry and Physics - Volume 130, Issue 3, 1 November 2011, Pages 937–942