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Journal of Nanomaterials
Volume 2012, Article ID 201584, 9 pages
http://dx.doi.org/10.1155/2012/201584
Research Article

Synthesis and Characterization of Metal Hydride/Carbon Aerogel Composites for Hydrogen Storage

1Department of Chemical Engineering and Materials Science, Fuel Cell Center, Yuan Ze University, Chungli 320, Taiwan
2School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia

Received 21 June 2012; Accepted 15 August 2012

Academic Editor: Hamed Bahmanpour

Copyright © 2012 Kuen-Song Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Two materials currently of interest for onboard lightweight hydrogen storage applications are sodium aluminum hydride (NaAlH4), a complex metal hydride, and carbon aerogels (CAs), a light porous material connected by several spherical nanoparticles. The objectives of the present work have been to investigate the synthesis, characterization, and hydrogenation behavior of Pd-, Ti- or Fe-doped CAs, NaAlH4, and MgH2 nanocomposites. The diameters of Pd nanoparticles onto CA’s surface and BET surface area of CAs were 3–10 nm and 700–900 m2g−1, respectively. The H2 storage capacity of metal hydrides has been studied using high-pressure TGA microbalance and they were 4.0, 2.7, 2.1, and 1.2 wt% for MgH2-FeTi-CAs, MgH2-FeTi, CAs-Pd, and 8 mol% Ti-doped NaAlH4, respectively, at room temperature. Carbon aerogels with higher surface area and mesoporous structures facilitated hydrogen diffusion and adsorption, which accounted for its extraordinary hydrogen storage phenomenon. The hydrogen adsorption abilities of CAs notably increased after inclusion of metal hydrides by the “hydrogen spillover” mechanisms.