Molybdenum-loaded 1,5-diaminonaphthalene/ZnO materials with improved electrical properties and affinity towards hydrogen at ambient conditions

摘要

Mo/DAN/ZnO was successfully synthesized through ZnO impregnation in a 1,5-diaminonaphthalene (DAN) solution followed by a dispersion of molybdenum nano particles (MoNPs). The resulting material was characterized by X-ray powder diffractometry, transmission electron microscopy, UV-diffuse reflectance, FT-IR spectrophotometery and complex impedance spectroscopy. No changes in the hexagonal shape of the ZnO crystals were noticed after modifications, but slight decrease in the optical band gap energy of Mo/DAN/ZnO was registered after incorporation of MoNPs and DAN. The effects of the surface groups of Mo/DAN/ZnO and charge transfer were found to be almost proportional to the capacitance. Mo/DAN/ZnO also displayed higher affinity towards hydrogen as compared to DAN/ZnO and ZnO. Hydrogen was found to adsorb almost instantly at ambient temperature and pressure, but maximum uptakes can be achieved only after long saturation time. This was explained in terms of diffusion hindrance. The results obtained herein open new prospects for Mo-loaded metal oxide as low cost electrode material and hydrogen storage matrice. (c) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.