METAL-LOADED CATALYST, ELECTRODE, AND BATTERY

• Main Authors: ICHIKAWA AKIRA FAXON, KOBAYASHI YOSHIKAZU, KATAGIRI NORIAKI, ISHIZUKA TAKUYA, SATO TETSUTARO, KISHIMOTO TAKEAKI
• Format: Patent
• Language: English; Japanese
• Published: 14.09.2023
• Subjects: APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; 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 metal-loaded catalyst that, while having a large noble metal content, exhibits both an excellent durability and an excellent catalytic function and also provide an electrode and a battery.SOLUTION: A metal-loaded catalyst comprises a carbon support and noble metal alloy-containing catalyst metal particles supported by the carbon support. The percentage for the weight of the noble metal with reference to the weight of the metal-loaded catalyst is at least 35 wt.%, and the BET specific surface area is at least 350 (m2/g-carbon support). The metal-loaded catalyst has the following property (a1) and/or property (a2): (a1) in the Raman spectrum provided by Raman spectroscopy, the ratio of the intensity of the 2D band having a peak top in the vicinity of a Raman shift of 2680 cm-1 to the intensity of the G band having a peak top in the vicinity of a Raman shift of 1600 cm-1, is at least 0.20 and at most 1.00; (a2) in the Raman spectrum provided by Raman spectroscopy, the half width at half maximum of the D band having a peak top in the vicinity of a Raman shift of 1340 cm-1 is at most 41.0 cm-1. The metal-loaded catalyst also has the following property (b1) and/or property (b2): (b1) the alloy composition heterogeneity is at most 0.55; (b2) the half-maximum asymmetry and the 1/4-maximum asymmetry are both at most 0.55.SELECTED DRAWING: None 【課題】大きな貴金属含有量を有しながら、優れた耐久性と優れた触媒機能とを兼ね備えた金属担持触媒、電極及び電池を提供する。【解決手段】金属担持触媒は、炭素担体と、前記炭素担体に担持された、貴金属合金を含む触媒金属粒子と、を含む金属担持触媒であって、前記金属担持触媒の重量に対する前記貴金属の重量の割合が３５重量％以上であり、ＢＥＴ比表面積が３５０（ｍ２／ｇ-炭素担体）以上であり、下記特性（ａ１）及び／又は（ａ２）：（ａ１）ラマン分光法により得られるラマンスペクトルにおいて、ラマンシフト１６００ｃｍ－１付近にピークトップを有するＧバンドの強度に対する、ラマンシフト２６８０ｃｍ－１付近にピークトップを有する２Ｄバンドの強度の比が０．２０以上、１．００以下；（ａ２）ラマン分光法により得られるラマンスペクトルにおいて、ラマンシフト１３４０ｃｍ－１付近にピークトップを有するＤバンドの半値半幅が４１．０ｃｍ－１以下；及び、下記特性（ｂ１）及び／又は（ｂ２）：（ｂ１）合金組成不均一性が０．５５以下；（ｂ２）半値非対称性及び１／４値非対称性がいずれも０．５５以下；を有する。【選択図】なし