Caesarea, Israel
Caesarea, Israel

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In an AMFC, in the formation of a CCM, the anode catalyst layer is selectively cross-linked while the cathode catalyst layer is not cross-linked. This has been found to provide structural stabilization of the CCM without loss of initial power value for a CCM without cross-linking.


Patent
Cellera Inc. | Date: 2012-05-15

In a method of preparing a ruthenium-containing catalyst on a non-conductive metal oxide support comprises dissolving one or more ruthenium precursor compounds in an liquid organic polyol, combining the thus obtained solution with (a) nano-powder(s) of one or more metal oxides in a ratio of moles metal oxide(s) to moles ruthenium atoms in the one or more ruthenium precursor compounds of about 0:1 to about 6:1, the metal oxide nano-powder(s) having a surface area of from about 5 to about 300m^(2)/g and a point of zero charge (PZC) of pH 5.5 or higher, agitating the thus obtained mixture, adding pre-shaped alumina sup port pellets to the agitated mixture, which is than heated at a temperature of about 50 C. to the boiling point of the organic polyol, until the reaction is finished, cooling the mixture and combining it with an aqueous solution of NaNO_(3 )and/or KNO_(3), agitating the resultant mixture, separating the solvent and the solids, and drying the thus obtained solid pellets of alumina, or alumina and the metal oxide(s) of the nano-powder(s) coated with ruthenium and an additional amount Na and/or K ions. Also disclosed is the sup ported ruthenium-containing catalyst obtainable by the method and the use thereof in decomposing ammonia into nitrogen and oxygen.


A catalyst coated membrane (CCM) for an alkaline fuel cell having OH-ion conducting catalyst layers and a membrane, wherein the ionomer throughout the entire CCM is cross-linked in one chemical step including cross-linking within the membrane and within the catalyst layers, thus enabling simultaneous chemical bonding across the interfaces between the catalyst layers and the ion conducting membrane.


Alkaline membrane fuel cells designed with silver cathode catalysts include a catalyst layer comprising silver metal nano-particles and an anion-conducting ionomer. The silver nano-particles are mixed with a solution of the ionomer to form a catalyst ink that is applied to an alkaline membrane to form an ultra-thin cathode catalyst layer on the membrane surface.


Patent
Cellera Inc. | Date: 2013-05-07

An anode catalyst for an alkaline membrane fuel cell (AMFC) includes a catalytically active component and a catalytically inactive component, wherein the catalytically active component is selected from one or more of the group of ruthenium (Ru), rhodium (Rh), silver (Ag), osmium (Os), iridium (Ir), platinum (Pt), silver (Ag) and gold (Au)) and wherein the catalytically inactive component is selected from the group of iron (Fe), lead (Pb), nickel (Ni), cobalt (Co) and zinc (Zn).


Embodiments of the invention provide an ammonia operated fuel cell system including an alkaline membrane fuel cell (AMFC) having an anode, and an ammonia thermal cracker including a combustion chamber, the cracker being in gas communication with an ammonia source, and configured to provide a supply of H_(2 )directly to the AMFC anode.


An air CO_(2 )filtration assembly or system is provided that includes CO_(2 )filters or traps designed and configured with a limited, but high capacity, volume to maximize filtration/absorption of CO_(2 )from an air stream supplied to an alkaline fuel cell to thereby minimize the CO_(2 )level in the air stream fed into the fuel cell cathode. The CO_(2 )filters or traps include at least one thermally regenerative CO_(2 )chemical filter or trap arranged in a tandem configuration with a strongly bonding CO_(2 )chemical filter or trap. The combination of the two types of filters or traps sequentially filter/absorb CO_(2 )from the air stream and reduce the level of CO_(2 )in the air stream fed into the cathode. The air CO_(2 )filtration assembly or system may be used in conjunction with electrochemical purging of the alkaline fuel cell that enables removal of CO_(2 )from the fuel cell by anodic decomposition of accumulated carbonate ions in the fuel cell anode and release of CO_(2 )through the anode exhaust stream.


In an AMFC, in the formation of a CCM, the anode catalyst layer is selectively cross-linked while the cathode catalyst layer is not cross-linked. This has been found to provide structural stabilization of the CCM without loss of initial power value for a CCM without cross-linking.


A device to produce electricity by a chemical reaction without the addition of liquid electrolyte comprises an anode electrode, a polymer membrane electrolyte fabricated to conduct hydroxyl (OH) ions, the membrane being in physical contact with the anode electrode on a first side of the membrane, and a cathode electrode in physical contact with a second side of the membrane. The anode electrode and cathode electrode contain catalysts, and the catalysts are constructed substantially entirely from non-precious metal catalysts. Water may be transferred to the cathode side of the membrane from an external source of water.


A device to produce electricity by a chemical reaction without the addition of liquid electrolyte comprises an anode electrode, a polymer membrane electrolyte fabricated to conduct hydroxyl (OH) ions, the membrane being in physical contact with the anode electrode on a first side of the membrane, and a cathode electrode in physical contact with a second side of the membrane. The anode electrode and cathode electrode contain catalysts, and the catalysts are constructed substantially entirely from non-precious metal catalysts. Water may be transferred to the cathode side of the membrane from an external source of water.

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