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- W1969866801 abstract "Abstract The hydrogen absorption of sodium intercalated fullerenes (Na x C 60 ) was determined and compared to pure fullerenes (C 60 ). Up to 3.5 mass% hydrogen can reversibly be absorbed in Na x C 60 at 200 °C and a hydrogen pressure of 200 bar. The absorbed amount of hydrogen is significantly higher than for the case when only the sodium would be hydrogenated (∼1 mass% for x = 10). At 200 bar the onset of hydrogen absorption is observed at 150 °C. At a pressure of 1 bar hydrogen the major desorption starts at 250 °C and is completed at 300 °C (heating rate 1 °C min −1 ). This absorption and desorption temperatures are significantly reduced compared to pure C 60 , either due to a catalytic reaction of hydrogen on sodium or due to the negatively charged C 60 . The hydrogen ab/desorption is accompanied by a partial de/reintercalation of sodium. A minor part of the hydrogen is ionically bonded in NaH and the major part is covalently bonded in C 60 H x . The sample can be fully dehydrogenated and no NaH is left after desorption. In contrast to C 60 , where the fullerene cages for high hydrogen loadings are destroyed during the sorption process, the Na x C 60 sample stays intact. The samples were investigated by X-ray, in-situ neutron powder diffraction and infrared spectroscopy. Na x C 60 was synthesized by reacting sodium azide (NaN 3 ) with C 60 (molar ratio of Na:C 60 is 10:1)." @default.
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- W1969866801 date "2012-10-01" @default.
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- W1969866801 title "Reversible hydrogen absorption in sodium intercalated fullerenes" @default.
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- W1969866801 doi "https://doi.org/10.1016/j.ijhydene.2012.07.045" @default.
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