CaNi5-based alloys and nanoconfined NaAlH4 for solid-state hydrogen storage
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A simple mechanical ball-milling and annealing has been used to synthesize CaNi5-based alloys. Heat treatment at 800 ºC under vacuum results in the formation of a crystalline CaNi5 phase. CaNi4.9Al0.1 shows durability improvement by maintaining its initial hydrogen absorption capacity for 20 cycles performed at 85 ºC. NaAlH4 was confined within 2-3 nm pores in a carbon scaffold and shows significant improvement in the hydrogen desorption kinetics and thermodynamic properties compared to bulk NaAlH4.
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Chumphongphan, Somwan; Paskevicius, Mark; Sheppard, Drew; Buckley, Craig (2013)A simple mechanical milling and annealing process has been used to synthesize CaNi5-based hydrogen storage alloys. Heat treatment at 800°C under vacuum results in theformation of a crystalline CaNi5 phase. Secondary phases, ...
Cycle life and hydrogen storage properties of mechanical alloyed Ca1-xZrxNi5-yCry; (x=0, 0.05 and y=0, 0.1)Chumphongphan, Somwan; Paskevicius, Mark; Sheppard, Drew; Buckley, Craig (2012)CaNi5–based alloys have been synthesized by mechanical alloying followed by isothermal annealing. The formation of the CaNi5 structure occurred when the milled powders were heated at 800 °C under vacuum for 3 h. The ...
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