Standard Article

Hydride storage

Fuel Cell Technology and Applications

Hydrogen storage and hydrogen generation

Development prospects for hydrogen storage

  1. G. Sandrock

Published Online: 15 DEC 2010

DOI: 10.1002/9780470974001.f302009

Handbook of Fuel Cells

Handbook of Fuel Cells

How to Cite

Sandrock, G. 2010. Hydride storage. Handbook of Fuel Cells. .

Author Information

  1. SunaTech Inc., Ringwood, NJ, USA

Publication History

  1. Published Online: 15 DEC 2010

Abstract

The principles and application of reversible metal hydrides for H2 storage for fuel cells are reviewed. The practical use of fuel cell waste heat is important for supplying the required heat of desorption for the hydride. A tutorial overview of hydrides is given, starting with the definitions of H capacity, thermodynamic and other important hydride properties. Using the near-ambient-temperature PEM fuel cell as a reference application, a review of hydrides capable of supplying H2 at pressures of 1–10 atm (absolute) and temperatures of 0–100 °C is given. Numerous such hydriding alloys and intermetallic compounds are available, but gravimetric H-densities are no greater than about 2 wt%, a distinct shortcoming for vehicular fuel cell applications. Although near-ambient-temperature hydrides have volumetric, pressure and safety advantages over advanced compressed H2 storage, they cannot compete on weight and, probably, cost bases. The potential for hydrides with greatly improved gravimetric capacities is discussed, especially relative to nanocrystalline Mg-alloys and alkali metal alanates.

Keywords:

  • enthalpy of formation;
  • entropy of formation;
  • solid polymer fuel cells (SPFC);
  • proton exchange membrane fuel cells (PEMFC);
  • hydrogen storage;
  • metal hydrides;
  • hydride properties;
  • intermetallic compounds;
  • AB5 type;
  • AB2 type;
  • AB type;
  • Mg hydrides;
  • complex hydrides;
  • alanates;
  • transition metal;
  • H-capacity;
  • gravimetric;
  • volumetric;
  • alloy cost