Mechanical stresses originating from metal hydride composites during cyclic hydrogenation. (24th August 2015)

• Record Type: Journal Article
• Authors: Heubner, Felix; Pohlmann, Carsten; Mauermann, Sebastian; Kieback, Bernd; Röntzsch, Lars
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 32(2015)
• Page Start: 10123
• Page End: 10130
• Publication Date: 2015-08-24
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.06.053
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">Metal hydride composites (MHC), which consist of a primary hydrogen absorbing phase and secondary phases such as graphite, offer very high volumetric storage densities and operation dynamics compared to widely used metal hydride powder beds.</p> <p id="abspara0015">Here, we report on the stress evolution of confined MHC during hydrogen ab- and desorption which is due to the lattice expansion of the hydrogen absorbing phase during hydrogen uptake. The stress development during hydrogenation was recorded <italic>in situ</italic> using a specially designed measuring cell. Influences of gas pressure, temperature and MHC geometry on the stress evolution were considered. In this regard, so-called <italic>pressure-stress-isotherms</italic> are proposed for the first time in thermomechanical analogy to pressure-composition-isotherms.</p> </sec> </abstract>