Hydrogen storage in hybrid nanostructured carbon/palladium materials: Influence of particle size and surface chemistry |
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Authors: | Philippe Dibandjo Claudia Zlotea Roger Gadiou Camelia Matei Ghimbeu Fermin Cuevas Michel Latroche Eric Leroy Cathie Vix-Guterl |
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Affiliation: | 1. Institut de Science des Matériaux de Mulhouse (IS2M), LRC-CNRS 7228, 15 Rue Jean Starcky, BP2488, F-68057 Mulhouse, France;2. Chimie Métallurgique des Terres Rares, Institut de Chimie et des Matériaux Paris-Est UMR-CNRS 7182, 2-8, rue H. Dunant, F-94320 Thiais, France |
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Abstract: | Hydrogen adsorption on porous materials is one of the possible methods proposed for hydrogen storage for transport applications. One way for increasing adsorption at room temperature is the inclusion of metal nanoparticles to increase hydrogen–surface interactions. In this study, ordered mesoporous carbon materials were synthesized by replication of nanostructured mesoporous SBA-15 silica. The combination of different carbon precursors allowed to tailor the textural, structural and chemical properties of the materials. These carbons were used for the synthesis of hybrid nanostructured carbon/palladium materials with different sizes of metal nanoparticles. The hydrogen sorption isotherms were measured at 77 K and 298 K between 0.1 and 8 MPa. Hydrogen storage capacities strongly correlate with the textural properties of the carbon at 77 K. At room temperature, Pd nanoparticles enhance hydrogen storage capacity by reversible formation of hydride PdHx and through the spillover mechanism. The hydrogen uptake depends on the combined influences of metal particle size and of carbon chemical properties. Carbons obtained from sucrose precursors lead to the hybrid materials with the highest storage capacities since they exhibits a large microporous volume and a high density of oxygenated surface groups. |
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Keywords: | Hydrogen adsorption Spillover Nanostructured carbon Palladium |
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