Titles:
Method for producing electrode catalyst for fuel cells
燃料電池用電極触媒の製造方法
Abstracts:
The present invention provides a means for producing with high productivity a fuel cell electrode catalyst that has both high initial performance and high durability. One embodiment of the present invention includes a carbon carrier and catalyst particles supported on the carbon carrier, and the carbon carrier has a specific surface area of 200 m2/g or less and a particle size of 0.7 to 1.5 μm. A method for producing a fuel cell electrode catalyst having a cumulative particle size distribution value (D90) of 90% of the range, comprising the following steps: crushing a carbon support raw material to have a specific surface area of 200 m2/g or less; , a carbon carrier preparation step in which a carbon carrier having a D90 in the range of 0.7 to 1.5 μm is obtained, and an electrocatalyst filtration in which an electrocatalyst in which catalyst particles are supported on a carbon carrier is filtered to obtain fine particles of an electrocatalyst. The method includes the steps of: [Selection diagram] Figure 1
The present invention provides a membrane electrode assembly of a proton exchange membrane fuel cell. The membrane electrode assembly comprises: an anode catalyst layer, a proton exchange membrane and a cathode catalyst layer, wherein the proton exchange membrane is a mica membrane, which has been pretreated by means of proton exchange, and the anode catalyst layer and the cathode catalyst layer each independently comprise a catalyst powder and a mica powder. The present invention also provides a preparation method for the membrane electrode assembly, and a proton exchange membrane fuel cell comprising the membrane electrode assembly.
Titles:
GAS DIFFUSION ELECTRODE FOR FUEL CELLS
燃料電池用ガス拡散電極
Abstracts:
The present invention provides a gas diffusion electrode which is capable of restraining the progression of carbon corrosion at an anode gas diffusion electrode of a fuel cell even in a reverse potential state that is caused by deficiency of a fuel supplied to the anode gas diffusion electrode, and which is therefore free from a decrease in the power generation performance of the cell. This gas diffusion electrode comprises a conductive porous base material that contains carbon fibers as a constituent material, and a microporous layer that is in contact with one surface of the conductive porous base material; and this gas diffusion electrode is characterized in that the microporous layer contains, as constituent materials, carbon fine particles and a fluororesin that has a fluoroalkyl chain, and if A (m2/g) is the specific surface area of the carbon fine particles, B (g/cm3) is the content of the carbon fine particles per unit volume in the microporous layer, and C (g/cm3) is the content of the fluororesin that has a fluoroalkyl chain per unit volume in the microporous layer, the value obtained by the formula X described below is 10 to 50. (Formula X): A - 30 × (C/B)
