Journal
JOURNAL OF POWER SOURCES
Volume 164, Issue 2, Pages 772-781Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2006.11.002
Keywords
hydrogen storage; sodium borohydride; hydrolysis; kinetics
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Chemical hydrides have been identified as a potential medium for on-board hydrogen storage, one of the most challenging technical barriers to the prospective transition from gasoline to hydrogen-powered vehicles. Systematic study of the feasibility of the sodium borohydride systems, and chemical-hydride systems more generally, requires detailed kinetic studies of the reaction for use in reactor modeling and system-level experiments. This work reports an experimental study of the kinetics of sodium borohydride hydrolysis with a Ru-on-carbon catalyst and a Langmuir-Hinshelwood kinetic model developed based on experimental data. The model assumes that the reaction consists of two important steps: the equilibrated adsorption of sodium borohydride on the surface of the catalyst and the reaction of the adsorbed species. The model successfully captures both the reaction's zero-order behavior at low temperatures and the first-order behavior at higher temperatures. Reaction rate constants at different temperatures are determined from the experimental data, and the activation energy is found to be 66.9 U mol(-1) from an Arrhenius plot. (c) 2006 Published by Elsevier B.V.
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