Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 34, Issue 21, Pages 8944-8950Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2009.08.060
Keywords
Hydrogen storage alloy; XRD; XPS; Crystal structure
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Funding
- National High Technology Research and Development Program of China (863 Program) [2006AA05Z131]
- Doctoral Fund of the Ministry of Education of China [2007008002]
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The evolution of crystal structure and chemical state of the V-based hydrogen storage alloy (Ti0.32Cr0.46V0.22)(96)Mn-4 during hydrogen absorption/desorption cycling was examined by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Reasons for the degradation in cycling capacity of the alloy are presented and discussed. One reason is the continuous reduction of the V-based cell volume during cycling, which cannot hold further hydrogen atoms. The decrease in cycling capacity can also be attributed to the oxidation of Ti, V, and Cr elements during cycling. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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