Abstract: An electrode catalyst for a fuel cell, the electrode catalyst having high initial activity and being capable of long-term retention of said activity; and a fuel cell using the electrode catalyst for a fuel cell. The electrode catalyst for a fuel cell includes catalyst metal particles that include platinum or a platinum alloy, and carrier particles that carry said catalyst metal particles, wherein the carrier particles are a carbonaceous material having a cumulative pore volume of 0.10 cc/g or less in the diameter range of 2 nm or less, and a BET specific surface area of greater than 900 m2/g; and a fuel cell comprising the electrode catalyst for a fuel cell.

Abstract: A fuel cell unit includes: a fuel cell stack in which a plurality of fuel cells are stacked; an electrical device; and a bus bar electrically connecting between a terminal of the fuel cell stack and a terminal of the electrical device. The bus bar includes a non-joined portion in which a plurality of metal plates are stacked without being joined to each other. The plurality of metal plates include a first metal plate and a second metal plate thicker than the first metal plate.

Abstract: A membrane electrode assembly for the fuel cell includes a solid polymer electrolyte membrane, an anode catalyst layer assembled to one surface of the solid polymer electrolyte membrane, and a cathode catalyst layer assembled to another surface of the solid polymer electrolyte membrane. The membrane electrode assembly contains cerium ions. The membrane electrode assembly includes a power-generation region and a non-power-generation region. The power-generation region includes the catalyst layers on both surfaces of the solid polymer electrolyte membrane in a center portion. The non-power-generation region is without the catalyst layer on at least one surface of the solid polymer electrolyte membrane in an outer periphery portion. A cerium ion content per area in the power-generation region is larger than a cerium ion content per area in the non-power-generation region.

Abstract: An electrode catalyst and a method for producing the electrode catalyst are described, in which the electrode catalyst includes catalyst metal particles containing platinum or a platinum alloy, and carrier particles supporting the catalyst metal particles. The carrier particles are made of a carbonaceous material with a BET specific surface area of 700 m2/g or more. The catalyst metal particles have an average particle size of 2.5 to 4.5 nm, and a standard deviation of the particle size of the catalyst metal particles is 1.30 nm or less. The electrode catalyst has a high initial activity and is able to maintain that activity over a long period of time.

Abstract: A membrane electrode assembly for the fuel cell includes a solid polymer electrolyte membrane, an anode catalyst layer assembled to one surface of the solid polymer electrolyte membrane, and a cathode catalyst layer assembled to another surface of the solid polymer electrolyte membrane. The membrane electrode assembly contains cerium ions. The membrane electrode assembly includes a power-generation region and a non-power-generation region. The power-generation region includes the catalyst layers on both surfaces of the solid polymer electrolyte membrane in a center portion. The non-power-generation region is without the catalyst layer on at least one surface of the solid polymer electrolyte membrane in an outer periphery portion. A cerium ion content per area in the power-generation region is larger than a cerium ion content per area in the non-power-generation region.

Abstract: An electrode catalyst for a fuel cell, the electrode catalyst having high initial activity and being capable of long-term retention of said activity; and a fuel cell using the electrode catalyst for a fuel cell. The electrode catalyst for a fuel cell includes catalyst metal particles that include platinum or a platinum alloy, and carrier particles that carry said catalyst metal particles, wherein the carrier particles are a carbonaceous material having a cumulative pore volume of 0.10 cc/g or less in the diameter range of 2 nm or less, and a BET specific surface area of greater than 900 m2/g; and a fuel cell comprising the electrode catalyst for a fuel cell.

Abstract: [Problem] The present invention has as its object the provision of an electrode catalyst for fuel cell with a high initial activity of the electrode catalyst and able to maintain that activity over a long period of time and a method of producing the same. [Solution] The present invention relates to an electrode catalyst for fuel cell, comprising catalyst metal particles containing platinum or a platinum alloy and carrier particles supporting the catalyst metal particles, wherein the carrier particles are made of a carbonaceous material with a BET specific surface area of 700 m2/g or more, wherein the catalyst metal particles have an average particle size of 2.5 to 4.5 nm, and wherein a standard deviation of the particle size of the catalyst metal particles is 1.30 nm or less.

Abstract: There are provided a catalyst layer for a fuel cell electrode and a method of producing the same. The catalyst layer for a fuel cell electrode includes a metal-supported catalyst including a carbon carrier and a metal catalyst supported on the carbon carrier and a fluororesin ionomer. A value obtained when a primary particle diameter of the carbon carrier measured with an SEM, a pH value of the metal-supported catalyst measured by a specific method, and a ratio between a weight of the fluororesin ionomer and a weight of the carbon carrier of the metal-supported catalyst are applied to a specific formula is a certain value or more.

Abstract: Provided are an electrode for fuel cell including a support with improved durability and capable of suppressing poisoning of catalyst particles by ionomer, and a method for manufacturing the same. The method at least includes: performing heat treatment of a support made of mesoporous carbon having a crystallite diameter Lc at 002 plane that is 1.5 nm or less, at 1,700° C. or more and less than 2,300° C.; supporting catalyst particles at least inside of the support subjected to the heat treatment; and applying ionomer to the support supporting the catalyst particles for coating.

Abstract: Provided are an electrode for fuel cell including a support with improved durability and capable of suppressing poisoning of catalyst particles by ionomer, and a method for manufacturing the same. The method at least includes: performing heat treatment of a support made of mesoporous carbon having a crystallite diameter Lc at 002 plane that is 1.5 nm or less, at 1,700° C. or more and less than 2,300° C.; supporting catalyst particles at least inside of the support subjected to the heat treatment; and applying ionomer to the support supporting the catalyst particles for coating.

Abstract: The present invention specifies the physical property valves of a catalytic layer correlating with the performance of a fuel cell, and provides the catalytic layer having the physical proper values and a fuel cell. Specifically, in a fuel cell having a membrane-electrode assembly provided with a catalytic layer 13 on each side of an electrolyte membrane 10, an electrode powder constituting the catalytic layer 13 shall have an amount of adsorbed water vapor in a range of 52 to 70 cm3(STP)/g by a value measured when the water-vapor partial pressure is 0.6, which is determined from the adsorption isotherm of water. The fuel cell having the catalytic layer with the use of the electrode powder having the amount of adsorbed water vapor in this range has the output performance of 0.6 A/cm2 or higher by current density at 0.6 V, in a less humidified condition and a more humidified condition.

Abstract: The present invention specifies the physical property valves of a catalytic layer correlating with the performance of a fuel cell, and provides the catalytic layer having the physical proper values and a fuel cell. Specifically, in a fuel cell having a membrane-electrode assembly provided with a catalytic layer 13 on each side of an electrolyte membrane 10, an electrode powder constituting the catalytic layer 13 shall have an amount of adsorbed water vapor in a range of 52 to 70 cm3(STP)/g by a value measured when the water-vapor partial pressure is 0.6, which is determined from the adsorption isotherm of water. The fuel cell having the catalytic layer with the use of the electrode powder having the amount of adsorbed water vapor in this range has the output performance of 0.6 A/cm2 or higher by current density at 0.6 V, in a less humidified condition and a more humidified condition.