화학공학소재연구정보센터
International Journal of Hydrogen Energy, Vol.45, No.3, 2054-2067, 2020
Controlling the growth of NaBH4 nanoparticles for hydrogen storage
Sodium borohydride (NaBH4) is a promising hydrogen storage material due to its potential for reversible hydrogen storage with high hydrogen capacity (10.8 mass%). However, the temperature at which hydrogen can be released from NaBH4 is too high (> 500 degrees C) for practical use and the reversible release of hydrogen is only feasible under severe conditions of temperature and pressure. Nanosizing is an effective strategy to improve the hydrogen properties of NaBH4. In this context, control over the particle size of NaBH4 has become important. Herein, we report on a solvent evaporation method for the synthesis of isolated NaBH4 nanoparticles with varying mean particle sizes and morphologies. In particular, the effects of surfactants' carbon chain lengths, their steric hindrance and functional groups in facilitating the stabilisation of NaBH4 nanoparticles of various sizes and shapes were investigated. Longer linear carbon chains bearing hard type functional groups were found to favour the growth of smaller NaBH4 nanoparticles. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.