Enhanced dehydrogenation performance of LiBH4 by confinement in porous NiMnO3 microspheres

摘要

The dehydrogenation behavior of LiBH4 has been investigated when confined into porous NiMnO3 microsphere via a wet chemical impregnation method. The confinement of LiBH4 in the pores of NiMnO3 nanoparticles leads to a significant decrease of the onset and the maximum desorption temperatures. The composites begin to release hydrogen at 150 degrees C and the maximum desorption temperature is 300 degrees C, which are much lower compared to the raw LiBH4. Also, the hydrogen release amount is found to be increased. Moreover, the LiBH4@NiMnO3 composites exhibit excellent dehydrogenation kinetics, with 2.8 wt% hydrogen released in 1 h at 300 degrees C. X-ray diffraction and Fourier transform infrared spectroscopy are used to deduce the desorption mechanism of NiMnO3. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.