Limits...
High temperature metal hydrides as heat storage materials for solar and related applications.

Felderhoff M, Bogdanović B - Int J Mol Sci (2009)

Bottom Line: High temperature metal hydrides offer high heat storage capacities around this temperature.Based on Mg-compounds, these hydrides are in principle low-cost materials with excellent cycling stability.Relevant properties of these hydrides and their possible applications as heat storage materials are described.

View Article: PubMed Central - PubMed

Affiliation: Max-Planck Institut für Kohlenforschung, Mülheim/Ruhr, Germany. felderhoff@mpi-muelheim.mpg.de <felderhoff@mpi-muelheim.mpg.de>

ABSTRACT
For the continuous production of electricity with solar heat power plants the storage of heat at a temperature level around 400 degrees C is essential. High temperature metal hydrides offer high heat storage capacities around this temperature. Based on Mg-compounds, these hydrides are in principle low-cost materials with excellent cycling stability. Relevant properties of these hydrides and their possible applications as heat storage materials are described.

Show MeSH

Related in: MedlinePlus

Dissociation pressure curve of MgH2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC2662468&req=5

f1-ijms-10-00325: Dissociation pressure curve of MgH2.

Mentions: The magnesium hydride/magnesium system is particularly suitable for both purposes, because in MgH2 the reversible hydrogen storage capacity is the highest among reversible binary hydrides (7.6 wt.%) and because upon the reaction of magnesium with hydrogen (Equation 2 ) a relatively large amount of heat (75 kJ·mol−1 H2, (0.9 kWh kg-1Mg) at a temperature level between 200 and 500 °C is set free. Herewith an extremely important region for heat storage becomes available, since according to the Carnot principle, heat energy at this level can be transformed with high efficiency into other energy forms like mechanical energy and hence in electricity. We are dealing here mainly with the application of magnesium hydride as a heat storage medium. The MgH2/Mg system (Equation 2), however, can also be applied for hydrogen storage. Upon gradually heating up of MgH2 in a closed system the compound will dissociate giving Mg and H2 and the hydrogen pressure above the remaining MgH2 will increase exponentially following the van’t Hoff law (Figure 1).


High temperature metal hydrides as heat storage materials for solar and related applications.

Felderhoff M, Bogdanović B - Int J Mol Sci (2009)

Dissociation pressure curve of MgH2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2662468&req=5

f1-ijms-10-00325: Dissociation pressure curve of MgH2.
Mentions: The magnesium hydride/magnesium system is particularly suitable for both purposes, because in MgH2 the reversible hydrogen storage capacity is the highest among reversible binary hydrides (7.6 wt.%) and because upon the reaction of magnesium with hydrogen (Equation 2 ) a relatively large amount of heat (75 kJ·mol−1 H2, (0.9 kWh kg-1Mg) at a temperature level between 200 and 500 °C is set free. Herewith an extremely important region for heat storage becomes available, since according to the Carnot principle, heat energy at this level can be transformed with high efficiency into other energy forms like mechanical energy and hence in electricity. We are dealing here mainly with the application of magnesium hydride as a heat storage medium. The MgH2/Mg system (Equation 2), however, can also be applied for hydrogen storage. Upon gradually heating up of MgH2 in a closed system the compound will dissociate giving Mg and H2 and the hydrogen pressure above the remaining MgH2 will increase exponentially following the van’t Hoff law (Figure 1).

Bottom Line: High temperature metal hydrides offer high heat storage capacities around this temperature.Based on Mg-compounds, these hydrides are in principle low-cost materials with excellent cycling stability.Relevant properties of these hydrides and their possible applications as heat storage materials are described.

View Article: PubMed Central - PubMed

Affiliation: Max-Planck Institut für Kohlenforschung, Mülheim/Ruhr, Germany. felderhoff@mpi-muelheim.mpg.de <felderhoff@mpi-muelheim.mpg.de>

ABSTRACT
For the continuous production of electricity with solar heat power plants the storage of heat at a temperature level around 400 degrees C is essential. High temperature metal hydrides offer high heat storage capacities around this temperature. Based on Mg-compounds, these hydrides are in principle low-cost materials with excellent cycling stability. Relevant properties of these hydrides and their possible applications as heat storage materials are described.

Show MeSH
Related in: MedlinePlus