Structural, hydrogen storage and thermodynamic properties of some mischmetal–nickel alloys with partial substitutions for nickel

2009 ◽  
Vol 476 (1-2) ◽  
pp. 92-97 ◽  
Author(s):  
E. Anil Kumar ◽  
M. Prakash Maiya ◽  
S. Srinivasa Murthy ◽  
B. Viswanathan
Keyword(s):  
Thermodynamic Properties ◽  
Hydrogen Storage ◽  
Nickel Alloys

scholarly journals Hydrogen storage in complex metal hydrides

2009 ◽  
Vol 74 (2) ◽  
pp. 183-196 ◽  
Author(s):  
Borislav Bogdanovic ◽  
Michael Felderhoff ◽  
Guido Streukens
Keyword(s):  
Fuel Cells ◽  
Solid State ◽  
Thermodynamic Properties ◽  
Hydrogen Storage ◽  
Sodium Borohydride ◽  
Metal Hydride ◽  
Metal Hydrides ◽  
Hydrogen Storage Materials ◽  
High Hydrogen ◽  
Complex Metal

Complex metal hydrides such as sodium aluminohydride (NaAlH4) and sodium borohydride (NaBH4) are solid-state hydrogen-storage materials with high hydrogen capacities. They can be used in combination with fuel cells as a hydrogen source thus enabling longer operation times compared with classical metal hydrides. The most important point for a wide application of these materials is the reversibility under moderate technical conditions. At present, only NaAlH4 has favorable thermodynamic properties and can be employed as a thermally reversible means of hydrogen storage. By contrast, NaBH4 is a typical non-reversible complex metal hydride; it reacts with water to produce hydrogen.

scholarly journals Thermodynamic Database for Hydrogen Storage Materials

2010 ◽  
Vol 72 ◽  
pp. 213-218 ◽  
Author(s):  
Marcello Baricco ◽  
Mauro Palumbo ◽  
Eugenio Pinatel ◽  
Marta Corno ◽  
Piero Ugliengo
Keyword(s):  
Thermodynamic Properties ◽  
Hydrogen Storage ◽  
Thermodynamic Stability ◽  
Thermodynamic Database ◽  
Calphad Approach ◽  
Complex Hydrides ◽  
Crystal Code ◽  
Hydrogen Substitution ◽  
Synthesis Reactions ◽  
Energy Of Formation

In order to be used for applications, the thermodynamic stability of a candidate hydrogen storage material should be suitable for hydrogen sorption at room conditions. By mixing different hydrides, it is possible to promote the hydrogenation/dehydrogenation processes. On the other hand, small changes in composition allow a tailoring of thermodynamic stability of hydrides. Knowledge of thermodynamic stability of hydrides is thus fundamental to study the hydrogenation/dehydrogenation processes and useful to rationalize synthesis reactions and to suggest possible alternative reaction routes. The purpose of this work is to develop a consistent thermodynamic database for hydrogen storage systems by the CALPHAD approach. Experimental data have been collected from the literature. When experimental measurements were scarce or completely lacking, estimations of the energy of formation of hydrides have been obtained by ab initio calculations performed with the CRYSTAL code. Several systems of interest for hydrogen storage have been investigated, including metallic hydrides (M-H) and complex hydrides. The effect on thermodynamic properties of fluorine-to-hydrogen substitution in some simple hydrides is also considered. Calculated and experimental thermodynamic properties of various hydrides have been compared and a satisfactory agreement has been achieved.

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