Abstract: An object of the present invention is to provide a method for producing fine catalyst particles, a method for producing carbon-supported fine catalyst particles, a method for producing a catalyst mix, and a method for producing an electrode, all of which are configured to inhibit, when used in fuel cells, etc., performance deterioration during operation at especially high temperature. Disclosed is a method for producing fine catalyst particles each comprising a core particle and an outermost layer, the core particle containing palladium and the outermost layer containing platinum and covering the core particle, the method comprising the steps of: preparing palladium-containing particles; preparing an acid solution configured to dissolve palladium more preferentially than platinum; covering each palladium-containing particle with an outermost layer containing platinum; and bringing the palladium-containing particles each covered with the outermost layer into contact with the acid solution.

Abstract: A fuel cell including a single fuel cell which includes a membrane electrode including a polymer electrolyte membrane, an anode electrode on one surface of the polymer electrolyte membrane, and a cathode electrode on another surface of the polymer electrolyte membrane, the anode electrode including an anode catalyst layer and a gas diffusion layer and the cathode electrode including a cathode catalyst layer and a gas diffusion layer. At least one of the anode cathode catalyst layers includes core-shell type catalyst particles, each having a core and a shell covering the core and including a shell metallic material. At least one of the polymer electrolyte membrane, anode catalyst layer, gas diffusion layer at the anode side, cathode catalyst layer and gas diffusion layer at the cathode side includes metallic nanoparticles having an average particle diameter different from that of the core-shell type catalyst particles and including the shell metallic material.

Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.

Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.

Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.

Abstract: A catalyst particle is composed of an inner particle and an outermost layer that includes platinum and covers the inner particle. The inner particle includes on at least a surface thereof a first oxide having an oxygen defect.

Abstract: A fuel cell system which prevents a reduction in catalyst activity, wherein at least one of the anode catalyst layer and the cathode catalyst layer includes a core-shell type catalyst particle having a core portion including a core metallic material and a shell portion covering the core portion and including a shell metallic material; and wherein the fuel cell system has: a means for storing an initial value of a ratio of the core metallic material to a surface area of the core-shell type catalyst particle, and a means for determining whether or not the ratio of the core metallic material to the surface area of the core-shell type catalyst particle is increased at a predetermined stage, compared to the initial value.

Abstract: The present invention provides core-shell type metal nanoparticles having a high surface coverage of the core portion with the shell portion, and a method for producing the same. Disclosed is core-shell type metal nanoparticles comprising a core portion comprising a core metal material and a shell portion covering the core portion, wherein the core portion substantially has no {100 } plane of the core metal material on the surface thereof.

Abstract: A fuel cell including a single fuel cell which includes a membrane electrode including a polymer electrolyte membrane, an anode electrode on one surface of the polymer electrolyte membrane, and a cathode electrode on another surface of the polymer electrolyte membrane, the anode electrode including an anode catalyst layer and a gas diffusion layer and the cathode electrode including a cathode catalyst layer and a gas diffusion layer. At least one of the anode cathode catalyst layers includes core-shell type catalyst particles, each having a core and a shell covering the core and including a shell metallic material. At least one of the polymer electrolyte membrane, anode catalyst layer, gas diffusion layer at the anode side, cathode catalyst layer and gas diffusion layer at the cathode side includes metallic nanoparticles having an average particle diameter different from that of the core-shell type catalyst particles and including the shell metallic material.

Abstract: Core-shell type metal nanoparticles including a core portion and a shell portion covering the core portion, wherein the core portion includes a core metal material selected from metals and alloys, and wherein the shell portion includes an alloy of a first shell metal material and a second shell metal material.

Abstract: Disclosed is a catalyst particle having high catalyst activity and a method for producing the catalyst particle. A catalyst particle comprising a core particle which contains a palladium alloy and an outermost layer which contains platinum, wherein an interlayer comprising only palladium as a simple substance is present between the core particle and the outermost layer.

Abstract: A fuel cell 10 includes an MEA 200, an anode separator 100 and a cathode separator 300. The anode separator 100 forms alternate first and second flow channels 110 and 120. The first flow channel 110 is blocked in the middle. The second flow channel 120 is blocked in the both ends. The anode separator 300 forms alternate first and second flow channels 310 and 320. The first flow channel 310 is blocked in the middle. The second flow channel 320 is blocked in the both ends.

Abstract: The present invention provides a fuel cell capable of inhibiting desiccation and flooding of a membrane electrode assembly. The fuel cell has a laminated body having a membrane electrode assembly including an electrolyte membrane sandwiched by an anode catalyst layer and a cathode catalyst layer. A pair of separators sandwiches the laminated body, and between at least one separator and the laminated body, inlet and outlet passages are formed. The inlet passage is blocked at a downstream end of the reaction gas supplied to the laminated body and the outlet passage is blocked at an upstream end of the reaction gas having passed through the laminated body. The inlet passage and the outlet passage are arranged separately from each other. The depth of the upstream region of the inlet passage is larger than that of the downstream region of the inlet passage.

Abstract: The present invention provides a fuel cell having obstructed passages, which is capable of inhibiting the occurrence of flooding. The fuel cell comprises: a stacked body comprising at least a membrane electrode assembly; and a pair of separators sandwiching the stacked body. A face of the stacked body side of the separator is provided with inlet passage(s) through which reaction gas to be supplied to the stacked body passes and outlet passage(s) through which reaction gas having passed the stacked body passes. The inlet passage is obstructed at a downstream end of the reaction gas to be supplied to the stacked body and the outlet passage is obstructed at an upstream end of the reaction gas having passed through the stacked body. The inlet passage and the outlet passage is arranged separately from each other, and the inlet passage is arranged on both ends of the face of the stacked body side of the separator in the passage width direction of the inlet passage and the outlet passage.

Abstract: A method of producing a core-shell catalyst particle, the method including: preparing a core particle that contains an alloy including a first core metal having a standard electrode potential of at least 0.6 V and a second core metal having a standard electrode potential lower than that of the first core metal; eluting the second core metal at least at a surface of the core particle, the elution being carried out under conditions at which an equilibrium is maintained for the first core metal between a metal state and a hydroxide and at which an equilibrium is maintained for the second core metal between a metal state and a metal ion; and, with the core particle being designed as a core portion, coating this core portion with a shell portion after the elution of the second core metal.

Abstract: A fuel cell 10 includes an MEA 200, an anode separator 100 and a cathode separator 300. The anode separator 100 forms alternate first and second flow channels 110 and 120. The first flow channel 110 is blocked in the middle. The second flow channel 120 is blocked in the both ends. The anode separator 300 forms alternate first and second flow channels 310 and 320. The first flow channel 310 is blocked in the middle. The second flow channel 320 is blocked in the both ends.

Abstract: The present invention provides a fuel cell having obstructed passages, which is capable of inhibiting the occurrence of flooding. The fuel cell comprises: a stacked body comprising at least a membrane electrode assembly; and a pair of separators sandwiching the stacked body. A face of the stacked body side of the separator is provided with inlet passage(s) through which reaction gas to be supplied to the stacked body passes and outlet passage(s) through which reaction gas having passed the stacked body passes. The inlet passage is obstructed at a downstream end of the reaction gas to be supplied to the stacked body and the outlet passage is obstructed at an upstream end of the reaction gas having passed through the stacked body. The inlet passage and the outlet passage is arranged separately from each other, and the inlet passage is arranged on both ends of the face of the stacked body side of the separator in the passage width direction of the inlet passage and the outlet passage.

Abstract: The present invention provides a fuel cell which is capable of improving electric power generation efficiency at a time of high-temperature operation. The fuel cell 10 comprising: a membrane electrode assembly 4; and a pair of gas separators 7, 8 sandwiching the membrane electrode assembly 4 therebetween, wherein at least one of the gas separator(s) 7 and/or 8 comprises a compact layer(s) 7c and/or 8c which is capable of preventing permeation of fluid and a porous layer (s) 7d and/or 8d which allows permeation of fluid, and the porous layer(s) 7d and/or 8d is impregnated with a water-soluble liquid having higher boiling point than that of water.

Abstract: The present invention provides a fuel cell having a blocked passage and showing capability of inhibiting desiccation and flooding of the membrane electrode assembly.

Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.