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Title: FUNDAMENTAL ENVIRONMENTAL REACTIVITY TESTING AND ANALYSIS OF THE HYDROGEN STORAGE MATERIAL 2LIBH4 MGH2

FUNDAMENTAL ENVIRONMENTAL REACTIVITY TESTING AND ANALYSIS OF THE HYDROGEN STORAGE MATERIAL 2LIBH4 MGH2 While the storage of hydrogen for portable and stationary applications is regarded as critical in bringing PEM fuel cells to commercial acceptance, little is known of the environmental exposure risks posed in utilizing condensed phase chemical storage options as in complex hydrides. It is thus important to understand the effect of environmental exposure of metal hydrides in the case of accident scenarios. Simulated tests were performed following the United Nations standards to test for flammability and water reactivity in air for a destabilized lithium borohydride and magnesium hydride system in a 2 to 1 molar ratio respectively. It was determined that the mixture acted similarly to the parent, lithium borohydride, but at slower rate of reaction seen in magnesium hydride. To quantify environmental exposure kinetics, isothermal calorimetry was utilized to measure the enthalpy of reaction as a function of exposure time to dry and humid air, and liquid water. The reaction with liquid water was found to increase the heat flow significantly during exposure compared to exposure in dry or humid air environments. Calorimetric results showed the maximum normalized heat flow the fully charged material was 6 mW/mg under liquid phase hydrolysis; and 14 mW/mg for the fully discharged material more » also occurring under liquid phase hydrolysis conditions. « less
Authors: ; ; ; ;
Publication Date:
OSTI Identifier:OSTI ID: 1032955
Report Number(s):SRNL-STI-2012-00012
Journal ID: ISSN 0360-3199; IJHEDX; TRN: US201202%%506
DOE Contract Number:DE-AC09-08SR22470
Resource Type:Journal Article
Resource Relation:Journal Name: International Journal of Hydrogen Energy; Journal Volume: 37; Journal Issue: 3
Research Org:SRS
Sponsoring Org:DOE
Country of Publication:United States
Language:English
Subject: 08 HYDROGEN; 30 DIRECT ENERGY CONVERSION; ACCIDENTS; BOROHYDRIDES; CALORIMETRY; ENTHALPY; ENVIRONMENTAL EXPOSURE; FLAMMABILITY; FUEL CELLS; HEAT FLUX; HYDRIDES; HYDROGEN; HYDROGEN STORAGE; HYDROLYSIS; KINETICS; LITHIUM; MAGNESIUM HYDRIDES; MIXTURES; STORAGE; TESTING