METHOD FOR MANUFACTURING FUEL CELL AND CATALYST INK

• Main Author: SAITO TAKEAKI
• Format: Patent
• Language: English; Japanese
• Published: 13.11.2014
• Subjects: BASIC ELECTRIC ELEMENTS; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

PROBLEM TO BE SOLVED: To suppress carbon oxidation of a catalyst layer.SOLUTION: A catalyst ink is used for forming a catalyst layer of a membrane electrode assembly including an electrolyte membrane, a catalyst layer including a catalyst carrying carbon and an ionomer, and a micro porous layer including a carbon and a binder. The catalyst ink includes: a catalyst carrying carbon; a first ionomer including a first molecular weight; a second ionomer having a second molecular weight higher than the first molecular weight; a first solvent having a first solubility parameter; and a second solvent having a second solubility parameter larger than the first solubility parameter. The ratio between the mass of the first solvent and the mass of the second solvent is equal to the ratio between the frequency of peak of the first ionomer and the frequency of peak of the second ionomer in a distribution graph of molecular weights of ionomers. 【課題】触媒層のカーボンの酸化を抑制する。【解決手段】電解質膜と、触媒担持カーボンとアイオノマとを含む触媒層と、カーボンとバインダとを含むマイクロポーラス層と、を有する膜電極接合体の触媒層を形成するための触媒インクである。この触媒インクは、触媒担持カーボンと、第１の分子量を有する第１のアイオノマと、第１の分子量よりも大きな第２の分子量を有する第２のアイオノマと、第１の溶解度パラメータを有する第１の溶媒と、第１の溶解度パラメータよりも大きな第２の溶解度パラメータを有する第２の溶媒と、を含んでいる。第１の溶媒の質量と第２の溶媒の質量との比は、アイオノマの分子量の分布グラフにおける第１のアイオノマのピークの頻度と第２のアイオノマのピークの頻度との比と等しい。【選択図】図３