Abstract: A fuel cell is provided with: a membrane electrode assembly (MEA); and a cathode-side separator assembled to the MEA, the cathode-side separator including first passages on a first surface of the cathode-side separator on a side closer to the MEA, and second passages on a second surface of the cathode-side separator on an opposite side, the first and second passages allowing oxidant gas to flow through the first and second passages, respectively. The first passages include first recessed portions on the first surface so as to extend from one end of the cathode-side separator to the other end, the second passages include second recessed portions on the second surface so as to extend from the one end to the other end and to be arranged alternately with the first recessed portions, and a penetration hole on a bottom face of the second recessed portion penetrating through the cathode-side separator.

Abstract: In a fuel cell stack, a separator includes, in a region adjacent to a coolant manifold of the unit cell in a planar direction, a sacrificial electrolytic corrosion region that is not adhered to an insulating sheet adjacent in a laminating direction, and a sealing region that is adjacent to the sacrificial electrolytic corrosion region in the planar direction and is adhered to the insulating sheet. The sacrificial electrolytic corrosion region includes a coolant lead-in or lead-out region and a region other than the coolant lead-in or lead-out region. A shape of the separator in the coolant lead-in or lead-out region is a flat plate shape that is in contact with the insulating sheet, and a shape of the separator in the region other than the coolant lead-in or lead-out region of is an uneven shape that is at least partially out of contact with the insulating sheet.

Abstract: The present invention is to provide a method for producing a catalyst for fuel cells with excellent durability, and a fuel cell comprising a catalyst for fuel cells produced by the production method. Disclosed is a method for producing a catalyst for fuel cells, the catalyst comprising fine catalyst particles, each of which comprises a palladium-containing core particle and a platinum-containing outermost layer covering the core particle, and carbon supports on which the fine catalyst particles are supported, wherein the method comprises the steps of: preparing carbon supports on which palladium-containing particles are supported; fining the carbon supports; and covering the palladium-containing particles with a platinum-containing outermost layer after the fining step.

Abstract: A fuel cell is provided with: a membrane electrode assembly (MEA); and a cathode-side separator assembled to the MEA, the cathode-side separator including first passages on a first surface of the cathode-side separator on a side closer to the MEA, and second passages on a second surface of the cathode-side separator on an opposite side, the first and second passages allowing oxidant gas to flow through the first and second passages, respectively.

Abstract: A fuel cell includes a power-generation channel provided on a surface of a cathode-side separator which faces a MEA and a cooling channel provided on a surface of the cathode-side separator opposite to the MEA. Air flows through the power-generation channel and the cooling channel. The cooling channel is separated from the power-generation channel by a side wall. The cross-sectional area of the power-generation channel on the air outlet side is smaller than that of the power-generation channel at a position upstream of the air outlet side, and the cross-sectional area of the cooling channel on the air outlet side is larger than that of the cooling channel at a position upstream of the air outlet side. A through-hole is provided in a side wall that separates the power-generation channel from the cooling channel.

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: 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: The present invention is to provide fine catalyst particles to which sulfate ions are less likely to be adsorbed, and a carbon-supported catalyst to which sulfate ions are less likely to be adsorbed.

Abstract: A fuel cell is provided with: a membrane electrode assembly (MEA); and a cathode-side separator assembled to the MEA, the cathode-side separator including first passages on a first surface of the cathode-side separator on a side closer to the MEA, and second passages on a second surface of the cathode-side separator on an opposite side, the first and second passages allowing oxidant gas to flow through the first and second passages, respectively.

Abstract: A fuel cell includes a power-generation channel provided on a surface of a cathode-side separator which faces a MEA and a cooling channel provided on a surface of the cathode-side separator opposite to the MEA. Air flows through the power-generation channel and the cooling channel. The cooling channel is separated from the power-generation channel by a side wall. The cross-sectional area of the power-generation channel on the air outlet side is smaller than that of the power-generation channel at a position upstream of the air outlet side, and the cross-sectional area of the cooling channel on the air outlet side is larger than that of the cooling channel at a position upstream of the air outlet side. A through-hole is provided in a side wall that separates the power-generation channel from the cooling channel.

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: The present invention is to provide such a carbon-supported catalyst that an activity expected from a catalytic activity by rotating disk electrode (RDE) evaluation is maintained even after the formation of a membrane electrode assembly (MEA). Disclosed is a carbon-supported catalyst wherein the carbon-supported catalyst includes fine catalyst particles that have a palladium-containing particle and a platinum-containing outermost layer covering at least part of the palladium-containing particle, and a carbon support supporting the fine catalyst particles, and wherein, in a cyclic voltammogram that is obtained by measuring, in an acid solution, the carbon-supported catalyst applied to a measurement electrode made of an electroconductive material, the proportion of the area of a hydrogen adsorption region that appears in a reduction current region to the total area of the hydrogen adsorption region and a hydrogen occlusion region that appears in the reduction current region, is 29% to 36%.

Abstract: The present invention is to provide fine catalyst particles to which sulfate ions are less likely to be adsorbed, and a carbon-supported catalyst to which sulfate ions are less likely to be adsorbed.

Abstract: The present invention is to provide such a carbon-supported catalyst that an activity expected from a catalytic activity by rotating disk electrode (RDE) evaluation is maintained even after the formation of a membrane electrode assembly (MEA). Disclosed is a carbon-supported catalyst wherein the carbon-supported catalyst includes fine catalyst particles that have a palladium-containing particle and a platinum-containing outermost layer covering at least part of the palladium-containing particle, and a carbon support supporting the fine catalyst particles, and wherein, in a cyclic voltammogram that is obtained by measuring, in an acid solution, the carbon-supported catalyst applied to a measurement electrode made of an electroconductive material, the proportion of the area of a hydrogen adsorption region that appears in a reduction current region to the total area of the hydrogen adsorption region and a hydrogen occlusion region that appears in the reduction current region, is 29% to 36%.

Abstract: An object of the present invention is to provide a production method which can increase the activity of a catalyst particle comprising a core particle and an outermost layer, the core particle comprising at least one of palladium and a palladium alloy, and the outermost layer comprising at least one of platinum and a platinum alloy and covering the core particle.

Abstract: An object of the present invention is to provide a production method which can increase the activity of a catalyst particle comprising a core particle and an outermost layer, the core particle comprising at least one of palladium and a palladium alloy, and the outermost layer comprising at least one of platinum and a platinum alloy and covering the core particle.

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: The present invention is to provide a method for producing a catalyst for fuel cells with excellent durability, and a fuel cell comprising a catalyst for fuel cells produced by the production method. Disclosed is a method for producing a catalyst for fuel cells, the catalyst comprising fine catalyst particles, each of which comprises a palladium-containing core particle and a platinum-containing outermost layer covering the core particle, and carbon supports on which the fine catalyst particles are supported, wherein the method comprises the steps of: preparing carbon supports on which palladium-containing particles are supported; fining the carbon supports; and covering the palladium-containing particles with a platinum-containing outermost layer after the fining step.

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: 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.