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Low-platinum core-shell catalyst, preparation method thereof and fuel cell

A core-shell catalyst and core technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor catalytic performance of low-platinum core-shell catalysts

Inactive Publication Date: 2021-06-04
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the objectives of the present invention is to provide a low-platinum core-shell catalyst and its preparation method, which solves the problem of poor catalytic performance of low-platinum core-shell catalysts in the prior art

Method used

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  • Low-platinum core-shell catalyst, preparation method thereof and fuel cell

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preparation example Construction

[0059] Described catalyst comprises complex body, and described complex body comprises inner core, the middle layer that coats described inner core, the shell that coats described middle layer; The preparation method of described complex body comprises the following steps:

[0060] S01, preparing a first mixed solution comprising transition metal nanoparticles, a noble metal salt and a first reducing agent, performing a first heating reduction reaction under alkaline conditions, and preparing transition metal nanoparticles coated with noble metal on the surface;

[0061] S02, preparing a second mixed solution containing the product in S01, a platinum salt and a second reducing agent, and performing a second heat reduction treatment under alkaline conditions to prepare the inner core, the intermediate layer covering the inner core, the coating A complex formed by an outer shell covering said intermediate layer;

[0062] The molar ratio of the platinum, noble metal and transitio...

Embodiment 1

[0118] Transition metal nanoparticles and preparation method thereof

[0119] Select any transition metal of Fe, Co, Ni, Cu, dissolve the hydrochloride or sulfate of the transition metal in absolute ethanol, form a transition metal salt dispersion through mixing and ultrasonic treatment, and the prepared transition metal salt The concentration is 0.02mol / L;

[0120] Prepare NaBH 4 Add the reducing agent alcohol dispersion into the transition metal salt dispersion to obtain the first mixed solution by adding the reducing agent alcohol dispersion while stirring, and control the dropping rate to 1-3mL / min and the stirring speed to 300 ~600 rpm; wait for NaBH 4 After the ethanol solution is added dropwise, continue to stir the transition metal salt and NaBH 4 The mixed solution of ethanol was used for 2 hours, and then the reduced transition metal nanoparticles were gradually separated by a centrifuge at 10000rpm, and the separated transition metal nanoparticles were washed wit...

Embodiment 2

[0122] Transition metal nanoparticles coated with noble metal intermediate layer and preparation method thereof

[0123] The obtained transition metal nanoparticles are dispersed in 50mL ethylene glycol solution, transferred to a flask, and ultrasonically dispersed and stirred to obtain the alcohol dispersion of the transition metal nanoparticles; Weigh chloroauric acid (AuCl 3 ·HCl·4H 2 O) be dissolved in ethylene glycol solution, wherein, the mol ratio of the chloroauric acid dropped into and the transition metal nano-particle is 1:3, make chloroauric acid be completely dissolved in ethylene glycol solution by stirring and prepare described noble metal chlorine Alcoholic dispersion of compounds;

[0124] The alcohol dispersion of the noble metal chloride is added to the alcohol dispersion of the transition metal nanoparticles in a manner of stirring while dropping, wherein, the speed of dropping is 1-2 mL / min; the speed of stirring is 500 ~600rpm; add 2mol / L NaOH solution ...

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Abstract

The invention provides a low-platinum core-shell catalyst. The low-platinum core-shell catalyst comprises a composite body consisting of an inner core, a middle layer and a shell, wherein the inner core is coated with the middle layer; the shell is coated with the middle layer; the particle size of the complex is 3-6 nm. The low-platinum core-shell catalyst forms a multilayer core-shell structure of 'core-middle layer-shell', and the particle size of the complex is further controlled to be 3-6nm, so the size of the low-platinum core-shell catalyst is moderate, and the highest catalytic activity and the best catalytic effect of the catalyst with the structure are ensured.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a low-platinum core-shell catalyst and a preparation method thereof, and also to a fuel cell using the catalyst. Background technique [0002] A fuel cell is an energy conversion device, which isothermally converts the chemical energy stored in fuel and oxidant directly into electrical energy according to the electrochemical principle, which is actually an oxidation-reduction reaction. Fuel cells are mainly composed of four parts, namely anode, cathode, electrolyte and external circuit. Fuel gas and oxidant gas are passed through the anode and cathode of the fuel cell respectively. The fuel gas emits electrons on the anode, and the electrons are conducted to the cathode through an external circuit and combine with the oxidizing gas to form ions. Under the action of the electric field, the ions migrate to the anode through the electrolyte, react with the fuel gas, form a circu...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/92
CPCH01M4/8657H01M4/8878H01M4/925Y02E60/50
Inventor 尚明丰
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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