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Compact solid source of hydrogen gas

United States Patent

June 8, 2004
View the Complete Patent at the US Patent & Trademark Office
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A compact solid source of hydrogen gas, where the gas is generated by contacting water with micro-disperse particles of sodium borohydride in the presence of a catalyst, such as cobalt or ruthenium. The micro-disperse particles can have a substantially uniform diameter of 1-10 microns, and preferably about 3-5 microns. Ruthenium or cobalt catalytic nanoparticles can be incorporated in the micro-disperse particles of sodium borohydride, which allows a rapid and complete reaction to occur without the problems associated with caking and scaling of the surface by the reactant product sodium metaborate. A closed loop water management system can be used to recycle wastewater from a PEM fuel cell to supply water for reacting with the micro-disperse particles of sodium borohydride in a compact hydrogen gas generator. Capillary forces can wick water from a water reservoir into a packed bed of micro-disperse fuel particles, eliminating the need for using an active pump.
Kravitz; Stanley H. (Placitas, NM), Hecht; Andrew M. (Sandia Park, NM), Sylwester; Alan P. (Albuquerque, NM), Bell; Nelson S. (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
10/ 191,900
July 9, 2002
FEDERALLY SPONSORED RESEARCH The United States Government has rights in this invention pursuant to Department of Energy Contract No. DE-AC04-94AL85000 with Sandia Corporation.