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However, noble metal catalysts are scarce resources and thus it would be too expensive to use them for large-scale commercial production of fuel cells
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[0034] The method for preparing a catalyst for a fuel cell according to the present invention is a method for preparing a catalyst for a fuel cell, wherein catalyst particles are supported by a conductive carrier, the method comprising the steps of:
[0035] Preparation of a supported catalyst wherein catalyst particles comprising a core particle comprising at least one of palladium and a palladium alloy and an outermost layer comprising at least one of platinum and a platinum alloy are supported by a conductive carrier. one and cover the core particle;
[0036] acid treatment to contact the supported catalyst with an acid solution that preferentially dissolves palladium over platinum; and
[0037] The supported catalyst is fired in a reducing gas atmosphere at a temperature above 80°C and below 200°C after the acid treatment step.
[0038] A core particle containing therein at least one of palladium (Pd) and a palladium alloy (Pd alloy) (hereinafter, the core particle may be...
Embodiment 1
[0131]First, a supported catalyst (Pt / Pd / C supported catalyst) in which Pt / Pd catalyst particles are supported by carbon particles (conductive support) is prepared.
[0132] Next, 1 g of the Pt / Pd / C supported catalyst was dispersed with ultrapure water (specific resistance: 18 MΩcm) by an ultrasonic homogenizer. Concentrated nitric acid was added to the dispersion thus obtained to prepare 100 mL of a dispersion having a nitric acid concentration of 1 mol / L.
[0133] While mixing the dispersion liquid thus obtained by an ultrasonic homogenizer, the liquid was heated to 60° C. and kept at 60° C. for 30 minutes, whereby the supported catalyst was acid-treated.
[0134] After the acid treatment, the dispersion was filtered, and the powdery solid thus obtained was washed with ultrapure water until the filtrate became neutral.
[0135] Then, the powder thus obtained was dispersed in 0.05 mol / L dilute sulfuric acid by an ultrasonic homogenizer. in making N 2 After bubbling gas int...
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Abstract
An object of the present invention is to provide a production method which can increase the activity of a catalyst particle comprising a core particle and an outermost layer, the core particle comprising at least one of palladium and a palladium alloy, and the outermost layer comprising at least one of platinum and a platinum alloy and covering the core particle. Disclosed is a method for producing a catalyst for fuel cells, in which a catalyst particle is supported by an electroconductive carrier, the method comprising the steps of: preparing a supported catalyst in which a catalyst particle comprising a core particle and an outermost layer is supported by an electroconductive carrier, the core particle comprising at least one of palladium and a palladium alloy, and the outermost layer comprising at least one of platinum and a platinum alloy and covering the core particle; acid treatment to bring the supported catalyst into contact with an acid solution which dissolves palladium more preferentially than platinum; and firing the supported catalyst at 80°C or more and less than 200°C in a reducing gas atmosphere after the acid treatment step.
Description
technical field [0001] The present invention relates to methods of preparing catalysts for use in fuel cells. More specifically, it relates to a method for preparing a catalyst for fuel cells comprising catalyst particles having a so-called core-shell structure. Background technique [0002] A fuel cell converts chemical energy directly into electrical energy by supplying fuel and an oxidant to two electrically connected electrodes and thereby electrochemically oxidizing the fuel. Unlike thermal power generation, fuel cells are not limited by the Carnot cycle; therefore, they exhibit high energy conversion efficiency. Fuel cells typically consist of a stack of individual cells, each containing a membrane electrode assembly as the basic structure, with an electrolyte membrane sandwiched between a pair of electrodes. [0003] Noble metal catalysts such as platinum catalysts and platinum alloy catalysts have been used as catalysts for anode electrodes and cathode electrodes o...
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