Study and characterization of a metal hydride container

A case study of a hydride container performance applying non dimensional parameters

“…1), obtaining T max , P e , DH abs , and C sg . Density, porosity and kinetics model parameters of the hydride were assumed to be the same as LaNi 5 parameters, since according to a previous sensitivity analysis [11], P e and DH abs are among the most relevant variables for numerical calculations. These parameters are summarized in Table 1.…”

Hydrogen desorption from a hydride container under different heat exchange conditions

“…The container used in the present work is a modified version of one reported previously [10], aimed to improve its performance associated with heat flow exchange. Its dimensions are: 50 mm outside diameter, 2 mm wall thickness and 200 mm length.…”

“…Details on the melting of this alloy and results of its characterization can be found in a previous publication [10]. The container volume (330 cm 3 ) is filled with 500 AE 1.5 g of hydride forming alloy.…”

“…In the present paper we carried out an experimental study on a cylindrical container, filled with AB 5 H 6 hydride (equilibrium pressure w350 kPa at 23 C) [10], provided with internal and external fins in order to enhance the flow of reaction heat. As this container is planned to feed a laboratory size hydrogen/oxygen fuel cell stack, its performance was characterized upon discharge at constant hydrogen flow rate under different heat exchange conditions, representing the expected operative situations of a fuel cell backup system.…”

Power generation/energy storage by a fuel cell/battery system: Regeneration of the MnO2 positive electrode with gaseous oxygen

“…To construct this type of novel bi-functional FCB system, the electrode materials are required to possess the following characteristics: (i) the negative electrode materials should be reduced by hydrogen gas (gaseous charging) and be oxidized during electrochemical reactions and (ii) the positive electrode materials should be oxidized by oxygen gas (gaseous charging) and be able to be reduced electrochemically [8]. Metal hydrides (MHs) are well suited for the negative electrode of the FCB system because they adsorb gaseous hydrogen [7,[10][11][12][13][14][15][16] and have been used as active materials in NiMH secondary batteries [15][16][17][18][19][20][21] as well as in air-metal batteries [11,[22][23]. It has been reported that MH can be rapidly charged to more than 70% of its theoretical capacity within 10 min by pressurized (0.3 and 0.5 MPa) gaseous hydrogen and that the charged MH can be electrochemically discharged by the reactions shown below [7]:…”