IONIC LIQUID-IMPREGNATED INORGANIC MATERIAL-COATED CATALYST PARTICLE, MEMBRANE ELECTRODE ASSEMBLY FOR FUEL CELL, AND FUEL CELL

• Main Author: KURIHARA HITOSHI
• Format: Patent
• Language: English; Japanese
• Published: 27.06.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide an ionic liquid-impregnated inorganic material-coated catalyst particle, etc., capable of obtaining a high voltage by including excellent oxygen reduction activities and also having excellent durability.SOLUTION: Ionic liquid-impregnated catalyst particles 1 each comprise a conductive carrier 2 and metal particles 3 that are supported by the conductive carrier 2. At least a portion of each metal particle 3 is coated with an inorganic material 4. At least a part of the surface of the metal particle 3, the surface being coated with the inorganic material 4, is in contact with an ionic liquid 5, and at least one of the requirements A and B described below is satisfied. Requirement A: The conductive carrier is formed of carbon, and the peak intensity ratio (G/D ratio) of the G-band to the D-band as determined by Raman spectroscopy is 1.6 or more and 2.2 or less at the laser wavelength of 532 nm. Requirement B: The conductive carrier has a pore volume of a mesopore region of 0.18 cm3/g or more as determined by a BJH method, and a peak top pore diameter of the pore distribution curve within the range of 2.6 nm or more and 2.8 nm or less as determined by a BJH method.SELECTED DRAWING: Figure 1 【課題】優れた酸素還元活性を備えることで高い電圧が得られるとともに、耐久性に優れたイオン液体含浸無機材料被覆触媒粒子等を提供する。【解決手段】イオン液体含浸触媒粒子１は、導電性担体２と、導電性担体２に担持された金属粒子３とを含み、金属粒子３の少なくとも一部分は無機材料４により被覆されており、無機材料４により被覆された金属粒子３の表面の少なくとも一部はイオン液体５と接しており、以下のＡ及びＢの少なくとも一方を満たす。要件Ａ：導電性担体は、カーボンであり、且つラマン分光法によるＧバンドとＤバンドのピーク強度比（Ｇ／Ｄ比）が、レーザー波長５３２ｎｍにおいて、１．６以上２．２以下である。要件Ｂ：導電性担体は、ＢＪＨ法によるメソポア領域の細孔容積が、０．１８ｃｍ３／ｇ以上であり、且つＢＪＨ法による細孔分布曲線のピークトップ細孔径が、２．６ｎｍ以上２．８ｎｍ以下の範囲内である。【選択図】図１