Properties of SBA-15 modified by iron nanoparticles as potential hydrogen adsorbents and sensors |
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| Institution: | 1. Nanoqam, Department of Chemistry, University of Quebec at Montreal, QC, Canada H3C 3P8;2. Environment, Catalysis and Analysis Methods Laboratory, ENIG University of Gabes, Tunisia;1. Departament de Química Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna, València, Spain;2. Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, 87036 Rende, Cosenza, Italy;3. Equipe de Chimie Moléculaire, Matériaux et Modélisation – C3M, Faculté Polydisciplinaire de Safi, Université Cadi Ayyad, Safi, Morocco;1. Micro and Mesoporous Molecular Sieves Group, Institute of Chemistry, University of Campinas, 270, Monteiro Lobato St, Cidade Universitária Zeferino Vaz, CEP 13083-861, Campinas, SP, Brazil;2. Laboratório de Nanotecnologia e Energia Solar, Institute of Chemistry, University of Campinas, 270, Monteiro Lobato St, Cidade Universitária Zeferino Vaz, CEP 13083-861, Campinas, SP, Brazil;3. Aalto University, New Energy Technologies Group, Department of Applied Physics, P.O. BOX 15100, FIN-00076, Aalto, Finland;1. Mössbauer Spectroscopy Laboratory, Pedagogical University, PL-30-084 Kraków, ul. Podchor??ych 2, Poland;2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, PL-50-422 Wroc?aw, ul. Okólna 2, Poland;3. Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Otto Stern Weg 1, Switzerland;4. International Laboratory of High Magnetic Fields and Low Temperatures, PL-53-421 Wroc?aw, ul. Gajowicka 95, Poland;1. Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, United States;2. Department of Chemistry, Ball State University, Muncie, IN, United States;1. Paul Scherrer Institut, Villigen AG, Switzerland;2. Regis University, Denver, CO, USA;3. Roma University and INFN, Roma, Italy;4. ETH Zurich, Zurich, Switzerland |
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| Abstract: | SBA-15-Fe was synthesized via the incorporation of Fe0 nanoparticles (Fe(0)-Nps) in the mesoporous channels. Electron microscopy and X-ray diffraction showed that dispersion of fine iron NPs occurs mainly inside the channels of SBA-15, producing a slight structure compaction. This was accompanied by a significant improvement of both the affinity towards hydrogen and electrical conductivity, as supported by hydrogen adsorption tests and impedance measurements. CO2 thermal programmed desorption measurements revealed an attenuation of the acid character of the solid surface. This was explained in terms of strong iron interaction with the lattice oxygen atoms that reduces the SiO–H bond polarity. The close vicinity of fine Fe(0)-Nps combined with the large pore size of SBA-15 appear to contribute to a synergistic improvement of the electrical conductivity. The results reported herein open new prospects for SBA-15 as potential adsorbents for hydrogen storage and carriers for hydrogen sensors. The use of iron in lieu of noble metals for designing such materials is a novelty, because such applications of iron-loaded silica have not been envisaged so far due to the high reactivity of iron towards air and water. The development of such technologies, if any, should address this issue. |
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| Keywords: | SBA Iron nanoparticles Basicity Hydrogen storage Sensor properties |
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