Spectroscopic studies of dehydrogenation of ammonia borane in carbon cryogel |
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Authors: | Sepehri Saghar Feaver Aaron Shaw Wendy J Howard Christopher J Zhang Qifeng Autrey Tom Cao Guozhong |
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Institution: | Materials Science and Engineering, University of Washington, 302 Roberts Hall, Box 352120, Seattle, Washington 98195, USA. |
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Abstract: | Ammonia borane (AB) is of great interest for storing hydrogen, an important issue in the growing field of hydrogen technology. The reaction pathways leading to the thermal decomposition of solid-state AB incorporated in carbon cryogels (CC) have been studied by spectroscopic methods. The time-dependent thermal decomposition was followed by in situ 11B nuclear magnetic resonance (NMR) and showed a significant increase in hydrogen release kinetics for AB in CC compared to neat AB. Both 11B NMR and Fourier transform infrared spectroscopy show a new reaction product, formed in the thermal decomposition of AB in CC scaffold (CC-AB) that is assigned to reactions with surface oxygen groups. The results indicate that incorporation of AB in CC enhances kinetics because of the reactions with residual surface-bound oxygen functional groups. The formation of new products with surface -O-B bonds is consistent with the greater reaction exothermicity observed when hydrogen is released from CC-AB materials. Scanning electron microscopy shows different morphology of AB in CC-AB nanocomposite as compared to neat AB. |
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