Toppan Printing Co., Ltd.

Hirosaki University

Madoka Ozawa

Yuki Igarashi

Hiroyuki Morioka

Junichi Kaminaga

Teruhiko Kai

Katsuyuki Kishi

Tadatoshi Maeda

Hiroyuki Michi

Hiroaki Koyama

Mitsuharu Chisaka

Naganori Ohama

A catalyst layer for polymer electrolyte fuel cells that improves drainage or gas diffusion, reduces or prevents the occurrence of cracking in a catalyst layer, enhances catalyst utilization efficiency, exerts high output power and high energy conversion efficiency, and has high durability, and also provides a membrane-electrode assembly and a polymer electrolyte fuel cell using the catalyst layer. The catalyst layer for polymer electrolyte fuel cells contains a catalyst, carbon particles, a polymer electrolyte, and a fibrous material. In the catalyst layer, the carbon particles carry the catalyst. The catalyst layer for polymer electrolyte fuel cells has voids. The percentage of frequencies of the voids having a cross-sectional area of 10,000 nmor more is 13% or more and 20% or less among the voids observed in a thickness-direction cross section of the catalyst layer for polymer electrolyte fuel cells perpendicular to the surface thereof.

Catalyst layer for polymer electrolyte fuel cells, membrane-electrode assembly, and polymer electrolyte fuel cell

A membrane electrode assembly includes a polyelectrolyte membrane having a first surface and a second surface facing away from the first surface; a fuel-electrode-side electrocatalyst layer bonded to the first surface and containing a first catalytic material, a first electrically conductive carrier, and a first polyelectrolyte, the first electrically conductive carrier carrying the first catalytic material; and an oxygen-electrode-side electrocatalyst layer bonded to the second surface and containing a second catalytic material, a second electrically conductive carrier, a second polyelectrolyte, and a fibrous material, the second electrically conductive carrier carrying the second catalytic material. The membrane electrode assembly contains voids, the voids including pores each having a size in a range of 3 nm or more and 5.5 &#x3bc;m or less.

Membrane electrode assembly and polymer electrolyte fuel cell

Provided are an electrode catalyst layer, a membrane electrode assembly and a polymer electrolyte fuel cell, having sufficient drainage property and gas diffusibility with high power generation performance over a long term. An electrode catalyst layer () bonded to a surface of a polymer electrolyte membrane () includes at least a catalyst substance (), a conductive carrier (), a polymer electrolyte () and fibrous substances (). The number of the fibrous substances () in which inclination &#x3b8; of axes with respect to a surface of the electrode catalyst layer () bonded to the surface of the polymer electrolyte membrane () is 0&#xb0;&#x2264;&#x3b8;&#x3c;45&#xb0;, among the fibrous substances (), is greater than 50% of the total number of the fibrous substances () contained.

Electrode catalyst layer, membrane electrode assembly and polymer electrolyte fuel cell

A catalyst layer comprising an interface to a polyelectrolyte membrane, the catalyst layer includes a layer forming material, which includes a catalytic substance, a conductive carrier which supports the catalytic substance, a polyelectrolyte, and a fibrous material, and a plurality of pores which contain no layer forming material. A pore area ratio which is a total area ratio of the plurality of pores to an area of a cross-section orthogonal to the interface is 25.0% or more and 35.0% or less in a cross-sectional image captured by a scanning electron microscope.

Catalyst layer, membrane electrode assembly, and polyelectrolyte fuel cell

Provided is a catalyst for fuel cells including an oxygen atom, a nitrogen atom, a pentavalent phosphorus atom, and a transition metal atom, in which when the transition metal atom is represented by M, the catalyst for fuel cells is represented by a chemical formula MONP, and the transition metal atom is at least one selected from the group consisting of a titanium atom, a tantalum atom, a niobium atom, and a zirconium atom.

Catalyst for fuel cells, membrane electrode assembly, and polymer electrolyte fuel cell

The present invention provides a pattern formation substrate provided with a transparent substrate, a partition pattern formed on the transparent substrate in an approximately orthogonal grid shape, and a coloring pattern of plural colors, provided in an opening partitioned off with the partition pattern. The coloring pattern is formed in an approximately stripe shape in each of the colors, the partition pattern is composed of an X-direction partition pattern provided in an approximately orthogonal direction to a longitudinal direction of the stripe of the coloring pattern and a Y-direction partition pattern provided in an approximately parallel direction to the longitudinal direction of the stripe of the coloring pattern, and an average film thickness of the X-direction partition pattern is smaller than that of the Y-direction partition pattern.

Growing community of inventors

Tokyo, Japan

Madoka Ozawa