摘要:
A proton (H+)-conducting hydrocarbon (HC)-based polymer electrolyte membrane (PEM) having first and second oppositely facing surfaces comprises a HC-based membrane with at least one perfluoropolymer incorporated on or within at least the first and second surfaces. A method for fabricating the PEM comprises surface treating a HC-based polymeric membrane sheet via immersion in an aqueous solution or dispersion of said at least one perfluoropolymer, followed by drying of the surface treated polymeric membrane sheet.
摘要:
Electrodes for use in direct oxidation fuel cells (DOFCs) comprise, in sequence: an electrically conductive gas diffusion layer; a catalyst layer; and a proton-conducting layer. Membrane electrode assemblies (MEAs) comprise cathode and anode electrodes of such type sandwiching a proton conductive polymer electrolyte membrane (PEM), with the proton-conducting layer of the electrodes in contact with opposite surfaces of the PEM. Also disclosed is a method for fabricating the MEAs.
摘要:
A method of fabricating a supported catalyst layer for use in a fuel cell electrode, comprises sequential steps of: combining a fluid ink including a supported catalyst comprising at least one precious metal or alloy supported on particles of a support material, and a solution of at least one ionomeric polymer material, with at least one pore-forming material; forming a layer of the combined ink on a surface of a sheet of support material; hot pressing the layer; and treating the hot-pressed layer to remove pore-forming material to form a supported catalyst layer.
摘要:
A proton (H+)-conducting hydrocarbon (HC)-based polymer electrolyte membrane (PEM) having first and second oppositely facing surfaces comprises a HC-based membrane with at least one perfluoropolymer incorporated on or within at least the first and second surfaces. A method for fabricating the PEM comprises surface treating a HC-based polymeric membrane sheet via immersion in an aqueous solution or dispersion of said at least one perfluoropolymer, followed by drying of the surface treated polymeric membrane sheet.
摘要:
A proton (H+)-conducting hydrocarbon (HC)-based polymer electrolyte membrane (PEM) having first and second oppositely facing surfaces comprises a HC-based membrane with at least one perfluoropolymer incorporated on or within at least the first and second surfaces. A method for fabricating the PEM comprises surface treating a HC-based polymeric membrane sheet via immersion in an aqueous solution or dispersion of said at least one perfluoropolymer, followed by drying of the surface treated polymeric membrane sheet.
摘要:
A direct oxidation fuel cell (DOFC) system, comprises at least one fuel cell assembly including a cathode and an anode with an electrolyte positioned therebetween, adapted for performing selected electrochemical reactions; a source of concentrated liquid fuel in fluid communication with an inlet of the anode; an oxidant supply in fluid communication with an inlet of the cathode; a liquid/gas (L/G) separator in fluid communication with outputs of the anode and cathode for receiving unreacted fuel and liquid and gaseous products of the electrochemical reactions; and a converter for catalytically converting a portion of the unreacted fuel to the liquid and gaseous products.
摘要:
A cathode for use in a direct oxidation fuel cell (DOFC) comprises a gas diffusion medium (GDM) including a backing layer and a microporous layer comprising a fluoropolymer and an electrically conductive material, wherein loading of the fluoropolymer in the microporous layer is in the range from about 10 to about 60 wt. %. In use, a concentrated solution of a liquid fuel is supplied to an anode and an oxidant to the cathode of the fuel cell, and the fuel cell may be operated at a low oxidant stoichiometry ξc not greater than about 2.5.
摘要:
A direct oxidation fuel cell (DOFC) system comprises at least one fuel cell assembly including a cathode and an anode with an electrolyte positioned therebetween; a source of liquid fuel in fluid communication with an anode inlet; an oxidant supply in fluid communication with a cathode inlet; a liquid/gas (L/G) separator in fluid communication with anode and cathode outlets for: (1) receiving unreacted fuel and liquid and gaseous products of electrochemical reactions at the cathode and anode, and (2) supplying the unreacted fuel and liquid product to the inlet of said anode; and a control and/or regulation system for determining a fuel efficiency value of the DOFC system during operation and determining and regulating and/or controlling oxidant stoichiometry of the DOFC system at an appropriate value in response to the determined fuel efficiency value.
摘要:
A cathode for use in a direct oxidation fuel cell (DOFC) comprises a gas diffusion medium (GDM) including a backing layer and a microporous layer comprising a fluoropolymer and an electrically conductive material, wherein loading of the fluoropolymer in the microporous layer is in the range from about 10 to about 60 wt. %. In use, a concentrated solution of a liquid fuel is supplied to an anode and an oxidant to the cathode of the fuel cell, and the fuel cell may be operated at a low oxidant stoichiometry not greater than about 2.5.
摘要:
A direct oxidation fuel cell (DOFC) having a concentrated liquid fuel and an anode electrode configured to generate power. The anode electrode includes a diffusion medium (DM) with or without a microporous layer, such that a decrease in the porosity of the DM reduces fuel crossover through the membrane and achieves high power density of the DOFC fed directly with concentrated fuel.