Hydrogen storage in nanostructured carbon-based materials

3212 21 40532 7 93298 document 40532 Zhang11PhD.pdf application/pdf cdb61c42efbe791d1f1fc1d2de8b38d5 MD5 4014440 2014-12-11 14:57:33 http://etheses.bham.ac.uk//id/eprint/3212/1/Zhang11PhD.pdf 3212 1 1 application/pdf text en staffonly

Zhang11PhD.pdf

2111-12-31 accepted http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/40533 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/40533 http://eprints.org/relation/hassmallThumbnailVersion http://etheses.bham.ac.uk/id/document/40533 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/40534 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/40534 http://eprints.org/relation/haspreviewThumbnailVersion http://etheses.bham.ac.uk/id/document/40534 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/40535 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/40535 http://eprints.org/relation/hasIndexCodesVersion http://etheses.bham.ac.uk/id/document/40535 40533 2 93302 document 40533 small.png image/png 28a4f70e9464999cef701dd64899d14c MD5 2932 2014-12-11 15:59:54 http://etheses.bham.ac.uk//id/eprint/3212/2/small.png 3212 2 2 image/png thumbnail_small Thumbnail Documents conversion from application/pdf to thumbnail_small en staffonly

small.png

preview.jpg

indexcodes.txt

http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/40532 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/40532 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/40532 archive 4031 disk0/00/00/32/12 2012-02-21 13:20:30 2025-06-20 10:07:13 2025-06-20 10:07:13 thesis show 0 Zhang Yinghe Book David Harris Rex University of Birmingham Hydrogen storage in nanostructured carbon-based materials unpub T1 10col_ephy Full embargo until 19 Nov 2014, thereafter no access to e-copy until 31 Dec 2111 (100 years after graduation) Author contacted to confirm expiration of option D embargo – post-embargo access restriction now in effect until 31/12/2111 (RA 20/06/2025) Attention has been paid to carbon materials for use as hydrogen storage media, as carbon is light and generally of low-cost. Graphite ball-milled in hydrogen for 80 h can subsequently desorb 6 wt% hydrogen. However, the desorption temperature required is relatively high (over 400°C) and some methane is also evolved. Furthermore, it is not reversible (i.e. re-absorption is not possible for pure graphite). To understand the mechanism of hydrogen sorption, the effect of the milling conditions and additions on the microstructure and hydrogen storage properties have been investigated, by: Thermal Gravimetric Analysis - Mass Spectrometry, X-ray Diffraction, Scanning Electron Microscopy, Transmission Electron Microscopy, and Raman spectroscopy. In this work, graphite was ball-milled in a tungsten carbide pot (3 bar H\(_2\), up to 40 h). By careful control of the duration (10 h) of ball-milling under hydrogen, the optimum formation of nanostructured graphite for pure hydrogen desorption (5.5 wt%, around 400°C), was achieved. Preliminary studies also found that the hydrogen pressure during milling has a significant effect on both the hydrogen content and the desorption behaviour. A graphite-0.5 wt% Fe sample milled for 10 h desorbed the largest amount of pure H\(_2\) (9.6 wt%, at around 350°C). This value is similar to the estimated theoretical value (10 wt% H\(_2\)) and significantly higher than the reported highest values (6.1 wt% desorbed H\(_2\), with CH\(_4\)). Compared with pure graphite, the onset desorption temperature of the 0.5 wt% Fe sample decreased by 50°C; and amount of desorbed H\(_2\) approximately doubled. An understanding of the relation between microstructure and hydrogen sorption properties is useful for further understanding of the mechanism of hydrogen sorption and improving the hydrogen storage properties. 2011-12 2011-09 graduation eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. FALSE full_embargo 2014-11-19 c zhangyinghe@gmail.com 2111-12-31 ubira@lists.bham.ac.uk restricted 125 University of Birmingham School of Metallurgy and Materials d_ph na 2011-12 graduation