کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1608734 | 1005527 | 2015 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Tailoring the absorption–desorption properties of KSiH3 compound using nano-metals (Ni, Co, Nb) as catalyst Tailoring the absorption–desorption properties of KSiH3 compound using nano-metals (Ni, Co, Nb) as catalyst](/preview/png/1608734.png)
• The structural properties of catalyst modified KSi system are presented.
• The sorption kinetics is shown to be improved by catalyst doping.
• Nano-Ni doping reduce the sorption activation energy from 142 to 106 kJ mol−1.
Recently KSiH3 has been proposed as an attractive contender toward hydrogen storage media, owing to its high storage capacity i.e. 4.3 wt% within a good P-T window. The high activation energy for desorption allows KSiH3 to desorb hydrogen slowly only at 200 °C in more than 5 h. Moreover, the efforts to improve the kinetics by means of milling with carbon powder disproportionate KSiH3 into KH, Si and K–Si intermetallic phases. A number of known nano-metals viz. Ni, Co, and Nb are attempted in order to improve the sorption properties of KSiH3. Nano-Ni is found to be most effective catalyst with the lowest value of activation energy 106 kJ mol−1 in comparison to 142 kJ mol−1 for as annealed KSi sample.
Journal: Journal of Alloys and Compounds - Volume 645, Supplement 1, 5 October 2015, Pages S144–S147