Calcium Borohydride for Fuel Cell Applications

By: Joe Porwoll, Material Matters 2008, 3.2, 27.

Material Matters 2008, 3.2, 27.

Joe Porwoll, President
Aldrich Chemical Co., Inc.

Dr. Grigorii L. Soloveichik of General Electric Global Research kindly suggested that we introduce the solvent-free calcium borohydride, Ca(BH4)2, as a material for advanced fuel cell applications.1 Unsolvated Ca(BH4)2 is a base-material for novel hydrogen storage systems.2 In the crystal, the Ca2+ ion is surrounded by six tetrahedral BH4-units and each BH4-unit contacts with three Ca2+ ions. Hydrogen release from Ca(BH4)2 begins at 360 °C and is complete at 500 °C; the amount of hydrogen released is 9.6% by weight of the hydride. The material is a reversible hydrogen source. It can be regenerated by reaction with hydrogen gas at 700bar/400–440 °C.2 The regeneration pressure and temperature can be significantly reduced3 by doping Ca(BH4)2 with TiCl3 (Aldrich Prod. No. 695254).

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  1. Soloveichik G.L. Material Matters 2007, 2.2, 11.
  2. Roennebro, E.; Majzoub, E.H. J. Phys. Chem. B 2007,111, 12045.
  3. Kim, J.-H.; Jin, S.-A.; Shim, J.-H.; Cho, Y. W. Scripta Materialia 2008, 58, 481.

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