CATALYST LAYER FOR FUEL CELL AND ELECTROLYTE MEMBRANE-ELECTRODE ASSEMBLY

• Main Authors: AKATSUKA TAKUYA, GEMBA MIHO, ENDO NORIAKI
• Format: Patent
• Language: English; Japanese
• Published: 20.09.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; ELECTRICITY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR RELEVANT APPARATUS; TRANSPORTING

To provide a highly efficient catalyst layer for a fuel cell that can supply protons to the catalyst inside the pores of a catalyst carrier while suppressing poisoning of the catalyst by an ionomer.SOLUTION: A catalyst layer for a fuel cell according to the present disclosure includes a catalyst support material including a conductive catalyst carrier having pores and a catalyst at least partially supported inside the pores, and a proton-conducting ionomer coating at least a portion of the outer surface of the catalyst support material, and the catalyst support material has an amount of acidic functional groups modifying the outer surface and inside of the pores of the catalyst support of 0.2 mmol or more per unit weight gram of the catalyst support.SELECTED DRAWING: Figure 1 【課題】本開示は、アイオノマによる触媒の被毒を抑制しつつ触媒担体の細孔の内部の触媒にプロトンを供給することができる、高効率な燃料電池用触媒層を提供する。【解決手段】本開示における燃料電池用触媒層は、細孔を有する導電性の触媒担体と少なくとも一部が細孔の内部に担持された触媒とを備えた触媒担持材料と、触媒担持材料の外表面の少なくとも一部を被覆するプロトン伝導性のアイオノマと、を備える。そして、触媒担持材料は、触媒担体の外表面および細孔の内部に修飾する酸性官能基の量が、触媒担体の単位重量グラム当たり０．２ｍｍоｌ以上であることを特徴とする。【選択図】図１