MRS Bulletin

Metal hydrides for clean energy applications

Metal hydrides for clean energy applications

Recent developments in aluminum-based hydrides for hydrogen storage

Jason Graetza1 and Bjørn C. Haubacka2

a1 HRL Laboratories; jagraetz@hrl.com

a2 University of Oslo, Department of Physics; bjorn.hauback@fys.uio.no

Abstract

Aluminum hydride (AlH3), and the complex aluminum hydrides (e.g., M 3AlH6, MAlH5, M 2AlH7, M(AlH4) n ), make up a fascinating class of materials that have received considerable attention over the past 60 years for their use as explosives, reducing agents, solid rocket propellants, as well as a hydrogen source for portable power systems. The recent renaissance in hydrogen storage research, particularly for automotive applications, has generated renewed interest in aluminum-based hydrides due to their capacity to store up to 11 wt% hydrogen with volumetric capacities up to 150 g H2/L (more than twice that of liquid hydrogen). In addition, hydrogen can be released from these materials by low temperature thermolysis (<100°C), making them well-suited for proton exchange membrane fuel cells and other low temperature applications. This article covers recent research on aluminum-based hydrides, including crystal structures, thermodynamics, kinetics, hydrogenation conditions, and regeneration methods.

Key Words:

  • Al;
  • H;
  • Energy Storage;
  • Hydrogenation
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