Micro-porous layer and manufacturing method therefor, gas diffusion electrode substrate, and fuel battery
AssigneeToray Industries, Inc.
InventorsMasamichi Utsunomiya, Kentaro Kajiwara, Fumitaka Watanabe, Yasuaki Tanimura
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Abstract
The present invention provides a micro-porous layer which provides a fuel battery having high productivity, high power generation performance, and high durability. The present invention provides a micro-porous layer including fibrous carbohydrate having a fiber diameter of 5 nm-10 μm and an aspect ratio of 10 or more. The carbohydrate has an oxygen/carbon element ratio of 0.02 or more.
Claims13
A gas diffusion electrode substrate in which a micro-porous layer is provided on a conductive porous substrate, wherein the micro-porous layer comprises (i) a fibrous carbide having a Aber diameter of 5 nm or more and 10 μm or less and an aspect ratio of 10 or more and (ii) a conductive material,
- wherein an oxygen/carbon element ratio of the whole fibrous carbide is 0.02 or more, and wherein the oxygen/carbon element ratio is measured by performing a scanning electron microscope (SEM)-EDX measurement, under the conditions of an acceleration voltage of 10 kV and a magnification of 100,000 times, on a cross section in a thickness direction of the gas diffusion electrode substrate produced by an ion milling device.
A micro-porous layer having a contact angle with a droplet obtained by mixing 2-propanol and water at a ratio of 1:2 of 80° or more, comprising:
- (i) a conductive material having an aspect ratio of les 20, and comprising substantially no crack;
- and
- (ii) a water-repellent substance having a melt viscosity of 109 Pa·s or less.
A fuel battery comprising a micro-porous layer comprising (i) a fibrous carbide having a fiber diameter of 5 nm or more and 10 μm or less and an aspect ratio of 10 or more and (ii) a conductive material,
- wherein an oxygen/carbon element ratio of the whole fibrous carbide is 0.02 or more, and wherein the oxygen/carbon element ratio is measured by performing a scanning electron microscope (SEM)-EDX measurement, under the conditions of an acceleration voltage of 10 kV and a magnification of 100,000 times, on a cross section in a thickness direction of the gas diffusion electrode substrate produced by an ion milling device.
Dependencies are inferred from the claim text.