New complex hydrides, Zn(BH4)2 have been synthesized by an inexpensive mechanochemical process involving ball milling of stoichiometric NaBH4 and ZnCl2 under inert ambient. Extensive characterization such as structural, bonding environment, thermal and volumetric measurements are done by powder x-ray diffractometry, FTIR, Raman spectrometry, DSC, TGA and hydrogen sorption tools. Zn(BH4)2 possesses high hydrogen storage capacity of around 8.0 wt.% under thermal decomposition temperature of 100 deg C. It also exhibits reversibility of dehydrogenation and rehydrogenation characteristics under moderate temperature and pressure conditions. The stability of the structure due to strong B-H interaction inhibits the reversibility of reaction at low temperatures. Right now the research direction is focused on destabilizing the structure by catalytic doping or lattice substitution mechanisms.
Mechano-chemical synthesis and characterization of new complex hydrides for hydrogen storage
2006
6 Seiten, 4 Bilder, 17 Quellen
Conference paper
English
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