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Effect of Applied External Stress on Hydrogen Desorption from Metal Hydrides

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Abstract:

The effect of hydrostatic pressure mechanically applied to hydride on the equilibrium hydrogen gas pressure and temperature have been examined theoretically. From free energy calculations where elastic energy is taken into account, equilibrium gas pressure and temperature increases and decreases with increasing applied compressive stress, respectively. In the case of magnesium hydride, equilibrium temperature decreases to 63 °C at the hydrogen gas pressure being 1 atom when volume expansion at hydriding is perfectly suppressed by an external compressive stress. The temperature is remarkably lower than that obtained by alloying various elements.

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Periodical:

Advanced Materials Research (Volumes 26-28)

Pages:

217-220

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.26-28.217

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Online since:

October 2007

Authors:

Ryuji Matsumoto, Katsushi Tanaka, Kyosuke Kishida, Haruyuki Inui

Keywords:

Elastic Energy, Equilibrium Hydrogen Gas Pressure, External Stress

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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