摘要:
Provided is a gas diffusion electrode medium that is for a fuel cell, has a low in-plane gas permeability and favorable water drainage characteristics in addition to high conductivity, and is able to exhibit high cell performance across a wide temperature range from low temperatures to high temperatures. The gas diffusion electrode medium for a fuel cell is characterized by a microporous region being disposed at least at one surface of an electrode substrate, and the microporous region containing flake graphite having an aspect ratio in the range of 50-5000.
摘要:
The present invention provides a carbon sheet that has excellent anti-flooding ability and can be used suitably ill a gas diffusion electrode base material. Another aspect of the present invention provides a gas diffusion electrode base material using this carbon sheet as the base material, and a fuel cell containing this gas diffusion electrode. This carbon sheet is a porous carbon sheet containing a carbon fiber and a binding material and is characterized in that: layers are obtained in a section spanning from a plane closest to one of the surfaces and having 50% of the mean fluorine intensity to a plane closest to the other surface and having 50% of the mean fluorine intensity by dividing this section evenly into three in an orthogonal direction to the carbon sheet plane; among the layer close to one of the surfaces and the layer close to the other surface, the layer having the larger layer mean fluorine intensity is designated layer X, the layer having the smaller one is designated layer Y, and the layer between the layer X and the layer Y is designated layer Z; and the layer mean fluorine intensities decrease in the order: layer X, layer Y, and layer Z.
摘要:
The purpose of the present invention is to provide: a method for producing a gas diffusion electrode base which enables the achievement of a gas diffusion electrode base that has a microporous layer with small surface roughness and is not susceptible to damaging an electrolyte membrane; and a gas diffusion electrode base that has a microporous layer with small surface roughness and is not susceptible to damaging an electrolyte membrane. For the purpose of achieving the above-described purpose, the present invention has the configuration described below. Namely, a specific gas diffusion electrode base which has a carbon sheet and a microporous layer, and wherein the carbon sheet is porous and the DBP oil absorption of a carbon powder contained in the microporous layer is 70-155 ml/100g.
摘要:
An epoxy resin composition for a fiber-reinforced composite material which comprises the following components (A), (B) and (C): an alicyclic epoxy resin, a polyamine, and a latent acid catalyst being soluble in the component (A) or the component (B). The epoxy resin composition has a low viscosity and accordingly can be suitably used as a material for the molding of a fiber-reinforced composite material, for example, RTM. A cured product obtained by heating the composition has excellent thermal resistance and strength, and thus can be suitably used in members of an aircraft, a spacecraft, an artificial satellite and the like.
摘要:
The present invention addresses the problem of providing: a towpreg that has superior bobbin unspoolability and process pass-through properties, and is capable of yielding a fiber-reinforced composite having extremely high 0° tensile strength utilization; and a pressure vessel using such a towpreg. The means for solving this problem is a towpreg obtained by impregnating a reinforcing fiber tow with an epoxy resin composition containing [A]-[D], wherein: the epoxy resin composition contains 10-90 parts by mass of [A] and 10-50 parts by mass of [B] per 100 parts by mass of the epoxy resin component; the epoxy resin composition has a 25°C viscosity (η 25 ) of 1-40 Pa·s and a 40°C viscosity (η 40 ) of 0.2-5 Pa·s; and the cured epoxy resin composition has a glass transition temperature (Tg) of 95°C or higher. [A] A bisphenol epoxy resin [B] Unsubstituted or substituted N,N-diglycidyl aniline [C] Dicyandiamide [D] A cure accelerator
摘要:
An object of the present invention is to provide: a prepreg having an excellent tackiness as well as an excellent resin strength after curing and strength in the non-fiber direction; and a fiber-reinforced composite material using the prepreg. The present invention provides a prepreg composed of reinforcing fibers and a resin composition, wherein the resin composition includes the following components [A] to [C]: [A]: an epoxy resin; [B]: a dicyandiamide; and [C]: a compound which has a melting point of 130°C or lower and a solubility parameter whose difference from the solubility parameter of [B] is 8 or less; and wherein the resin composition has a viscosity at 25°C of 1,000 Pa·s or more.
摘要:
The purpose of the present invention is to provide a gas diffusion electrode having excellent dry-up resistance and flooding resistance, the gas diffusion electrode also having excellent power generation performance across a wide temperature range. In order to achieve this purpose, the present invention is configured as described below. Specifically, the present invention is a gas diffusion electrode having a microporous layer on at least one surface of an electroconductive porous substrate, wherein: the microporous layer has a first microporous layer in contact with the electroconductive porous substrate, and a dense layer in contact with the first microporous layer; the thickness of the dense layer is at least 1 µm; and the average number density B of pores having a pore diameter of 0.15-1 µm in the dense layer is at least 1.3A, where A is the average number density of pores having a pore diameter of 0.15-1 µm in the microporous layer disposed on at least one surface of the electroconductive porous substrate,.
摘要:
A gas diffusion electrode substrate that is used in a fuel cell, wherein a microporous layer constituted by a carbon based filler and a fluororesin is formed on one surface of the electrode substrate, the sliding angle of water on the surface on the opposite side of the surface on which the microporous layer is formed is 30 degrees or less, and the through-plane gas permeation resistance is 15 to 190 mmAq.
摘要:
A gas diffusion electrode substrate that is used in a fuel cell, wherein a microporous layer constituted by a carbon based filler and a fluororesin is formed on one surface of the electrode substrate, the sliding angle of water on the surface on the opposite side of the surface on which the microporous layer is formed is 30 degrees or less, and the through-plane gas permeation resistance is 15 to 190 mmAq.