ELECTRODE CATALYST LAYER, MEMBRANE ELECTRODE ASSEMBLY AND POLYMER ELECTROLYTE FUEL CELL

• Main Authors: KAYANE HIROYUKI, OKEYA YUTA
• Format: Patent
• Language: English; Japanese
• Published: 02.08.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide an electrode catalyst layer for a polymer electrolyte fuel cell, a membrane electrode assembly and a polymer electrolyte fuel cell, which are capable of improving output in power generation by an improvement in drainage and gas diffusivity.SOLUTION: An electrode catalyst layer comprises at least a catalyst, carbon particles carrying a catalyst, and a polymer electrolyte. When regions formed by dividing the electrode catalyst layer into three in the thickness direction of the electrode catalyst layer of a membrane electrode assembly formed on a polymer electrolyte membrane are denoted as a region A, a region B and a region C, respectively, in order from an electrolyte membrane side, the intensity of F(m/z19) derived from a polymer electrolyte when the intensity of C(m/z12) derived from carbon is 1, in the spectral intensity of the regions measured by TOF-SIMS, satisfies the following expressions. (Expression 1) F(m/z19) in region B/F(m/z19) in region A≥0.65 (Expression 2) F(m/z19) in region C/F(m/z19) in region B≥0.80SELECTED DRAWING: Figure 2 【課題】排水性とガス拡散性の向上により発電における出力を向上させる高分子形燃料電池用の電極触媒層、膜電極接合体および固体高分子形燃料電池を提供する。【解決手段】少なくとも触媒と、触媒を担持した炭素粒子および高分子電解質からなる電極触媒層であって、前記電極触媒層を高分子電解質膜上に形成して成る膜電極接合体の、前記電極触媒層の厚み方向に３つに区分した領域を電解質膜側から順に領域Ａ、領域Ｂ、領域Ｃとして、ＴＯＦ−ＳＩＭＳにより測定された前記領域のスペクトル強度において、炭素由来のＣ（ｍ／ｚ１２)の強度を１としたときの高分子電解質由来のＦ（ｍ／ｚ１９）の強度が、以下の式を満たすことを特徴とする電極触媒層。（式１）領域ＢのＦ（ｍ／ｚ１９）／領域ＡのＦ（ｍ／ｚ１９）≧０．６５（式２）領域ＣのＦ（ｍ／ｚ１９）／領域ＢのＦ（ｍ／ｚ１９）≧０．８０【選択図】図２