▎ 摘　　要

The hydrogen storage performance of hybrid nanocomposites composed of reduced graphene oxide, acid treated halloysite nanotubes and hexagonal boron nitride nanoparticles (RGO/A-HNT/h-BN) was studied. A modified Hummer's method and sonication assisted liquid-phase exfoliation technique were adopted for the synthesis of GO and preparation of hybrid nanocomposites (RGO/A-HNT/h-BN), respectively. The prepared hybrid nanocomposites were analyzed using X-ray diffraction (XRD), micro-Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Thermo Gravimetric Analysis (TGA). Using a Sieverts-like hydrogenation setup, the hydrogen storage properties of RGO/A-HNT/h-BN hybrid nanocomposite were examined. The RGO/A-HNT/h-BN hybrid nanocomposite exhibits 3.3 wt% of storage capacity at 50 degrees C and 100% desorption of stored hydrogen was observed in the temperature range of 119-143 degrees C. The average binding energy of stored hydrogen was found to be 0.32 eV and it lies in the recommended range of US-DOE targets. The reusability test confirms 93.3% storage capacity for the fifth cycle of hydrogenation. Hence it is expected that the prepared RGO/A-HNT/h-BN hybrid nanocomposite may serve as a promising hydrogen storage medium for fuel cell applications.