Hydrogen storage properties of various carbon supported NaBH_4 prepared via metathesis

摘要

Sodium borohydride nanoparticles prepared via the metathesis reaction between LiBH4 and NaCl were successfully deposited on various carbon supporting materials such as graphite, graphene oxide and carbon nanotubes. The X-ray diffraction analyses were conducted to identify the phase of NaBH4 deposited on various carbon supporting materials. The transmittance electron micrograph analyses were also conducted to investigate the particle size and dispersion of NaBH4 within carbon supporting materials. The particle size and size distribution of NaBH4 on graphite were observed to be larger and broader than of other two supporting materials, graphene oxide and CNT due to the lower surface energy as compared to GO and CNT. The bonding state of NaBH4 was confirmed by the Fourier-transformed infrared spectroscopy analysis. The TG and PCT results show that the hydrogen desorption of the NaBH4 deposited on carbon supports takes place at temperature (130 degrees C similar to) significantly lower than that of pure NaBH4 (above 500 degrees C) and the amount of desorption was in the order of graphene oxide (12.3 mass %) CNT (9.8 mass %) graphite (5.7 mass %). The reversibility of hydrogen adsorption after five cycles of adsorption-desorption showed that NaBH4 /GO and NaBH 4 /CNT were much better than that of pure NaBH4 due to excellent structural stability. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.