This invention is directed to aqueous redox flow batteries comprising redox-active metal ligand coordination compounds The compounds and configurations described herein enable flow batteries with performance and cost parameters that represent a significant improvement over that previous known in the art

Aqueous redox flow batteries comprising metal ligand coordination compounds

This invention is directed to aqueous redox flow batteries comprising ionically charged redox active materials and separators, wherein the separator is less than about 100 microns and the flow battery is capable of operating with high energy densities and voltage efficiencies.

Aqueous redox flow batteries featuring improved cell design characteristics

Stable solutions comprising high concentrations of charged coordination complexes, including iron hexacyanides are described, as are methods of preparing and using same in chemical energy storage systems, including flow battery systems. The use of these compositions allows energy storage densities at levels unavailable by other iron hexacyanide systems.

High solubility iron hexacyanides

Provided is a method of producing a fuel cell electrode catalyst that exhibits a high catalytic activity from transition metals (e.g., titanium) via a relatively low-temperature heat treatment (i.e., without performing a high-temperature heat treatment (firing) step). The method of producing a fuel cell electrode catalyst includes a step (1) for obtaining a catalyst precursor solution by mixing at least a transition metal-containing compound, a nitrogen-containing organic compound, and a solvent, a step (2) for removing the solvent from the catalyst precursor solution, and a step (3) for obtaining an electrode catalyst by subjecting the resultant solid residue from step (2) to a heat treatment having a temperature in the range of 500-1100°C, and is characterized in that some or all of the transition metal-containing compounds contain at least one transition metal element (M1) selected from among the group 4 and 5 elements of the periodic table as the transition metal.

Method of producing fuel cell electrode catalyst, method of producing transition metal oxycarbonitride, fuel cell electrode catalyst, and uses of same

Disclosed is an electrode catalyst for fuel cells, which uses a polynuclear complex, wherein a ligand having 5-15 coordinating atoms in a molecule is coordinated to 2-4 transition metal atoms, or a mononuclear metal complex, which contains an organic compound having two or more phenol rings and three or more aromatic heterocyclic rings as a ligand.

Electrode catalyst for fuel cell

This invention provides a membrane-electrode assembly comprising an electrode catalyst using a base metal complex The membrane-electrode assembly has an exchange current i0 of not less than 50 ~ 10-4 Acm-2 as determined from a Tafel plot regarding current density and voltage and a Tafel slope is not more than 450 mV/decade There is also provided a membrane-electrode assembly comprising a catalyst layer containing an electrode catalyst provided on both sides of an electrolyte membrane At least one of the catalyst layers contains a nonnoble metal-type electrode catalyst, and the electrolyte membrane is a hydrocarbon electrolyte membrane

Membrane-electrode assembly and fuel battery using the same

A membrane-electrode assembly, containing an electrode catalyst containing a base metal complex, in which exchange current density i 0 obtained from a Tafel plot, which is related to current density and voltage, is 5.0 × 10 -4 Acm -2 or more, and in which a Tafel slope obtained from the Tafel plot is 450 mV/decade or less; and 
a membrane-electrode assembly, containing catalyst layers each containing an electrode catalyst on both sides of an electrolyte membrane, in which at least one of the catalyst layers comprises a non-noble metal-based electrode catalyst, and in which the electrolyte membrane is a hydrocarbon-based electrolyte membrane.

Membrane-electrode assembly and fuel cell using the membrane-electrode assembly

PROBLEM TO BE SOLVED: To provide a polymer electrolyte membrane having high-temperature operability, and to provide a fuel cell or the like using the polymer electrolyte membrane. SOLUTION: The polymer electrolyte membrane including a fist face and a second face includes polymer electrolyte. The polymer electrolyte membrane has a first-face-to-second-face water vapor permeation coefficient of 7.0×10 -10 mol/sec/cm or greater when measured in a state that the first face is exposed under humidified environment having a temperature of 85°C and a relative humidity of 20% and the second face is exposed under non-humidified environment having a temperature of 85°C and a relative humidity of 0%, and a breaking stress of 20 MPa or greater under a temperature of 80°C and a relative humidity of 90%. The fuel cell or the like uses the polymer electrolyte membrane. COPYRIGHT: (C)2011,JPO&INPIT

Polymer electrolyte membrane, membrane-electrode assembly, and polymer electrolyte fuel cell

PROBLEM TO BE SOLVED: To provide a membrane-electrode assembly of high power generating characteristics using platinum-alternating catalyst and a fuel cell. SOLUTION: The membrane-electrode assembly, provided with electrode catalyst made up with the use of a base metal complex, has an exchange current density of 5.0×10 -14 Acm -2 or more as obtained from a Tafel plot concerning current density and voltage, and that, a Tafel gradient of 450 mV/decade or less. COPYRIGHT: (C)2009,JPO&INPIT

Membrane-electrode assembly and fuel cell using this

It is an object of this invention to provide a catalyst ink which allows formation of catalyst layers that can adequately improve durability of fuel cells. The catalyst ink of the invention is a catalyst ink for formation of a fuel cell catalyst layer, comprising a catalyst substance, a solvent and an aromatic polymer compound having a phosphorus atom-containing functional group, wherein at least the aromatic polymer compound is dispersed, and not dissolved, in the solvent.

Catalyst ink, method for producing catalyst ink, method for producing membrane-electrode assembly, membrane-electrode assembly produced by the method, and fuel cell

Taiga Sakai

Papers

Membrane-electrode assembly and fuel battery using the same

Membrane-electrode assembly and fuel cell using the membrane-electrode assembly

Polymer electrolyte membrane, membrane-electrode assembly, and polymer electrolyte fuel cell

Membrane-electrode assembly and fuel cell using this

Catalyst ink, method for producing catalyst ink, method for producing membrane-electrode assembly, membrane-electrode assembly produced by the method, and fuel cell