A catalyst with ultra-low platinum content for fuel cell and preparation method thereof

A fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of controlling surface layer thickness, reducing catalyst activity, and high operational requirements, achieving high battery performance, reducing the dependence on precious metals, and excellent catalytic performance. Effect

Inactive Publication Date: 2018-12-18
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dealloying treatment requires high equipment operation, and it needs to react with acid, which may reduce the surface active sites and reduce the catalyst activity.
[0007] At present, the content of platinum is reduced by simple replacement reaction using non-

Method used

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  • A catalyst with ultra-low platinum content for fuel cell and preparation method thereof
  • A catalyst with ultra-low platinum content for fuel cell and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Weigh 0.6 parts of nickel sulfate, 0.3 parts of silver nitrate, 0.2 parts of copper sulfate, 8 parts of dilute sulfuric acid, 1.5 parts of potassium chloroplatinate, 6 parts of oleylamine, 22 parts of trioctylphosphine, N,N - 55 parts of dimethylformamide, appropriate amount of deionized water for later use;

[0035] (2) Dissolve silver nitrate in deionized water to obtain a silver ion solution with a molar concentration of 0.2mol / L, then mix nickel sulfate, oleylamine and trioctylphosphine evenly, start heating at room temperature, and raise the temperature to 180 °C , keep warm for 3min to form a suspension, add dropwise silver nitrate solution, stir evenly, keep warm for 0.5h, and form a composite suspension;

[0036] (3) Place the composite suspension in an airflow with an air velocity of 0.5m / min, cool the suspension to room temperature, and then use a centrifuge to centrifuge the suspension at a speed of 600rpm. 5min, remove the lower layer of precipitation, ...

Embodiment 2

[0042] (1) Weigh 0.65 parts of manganese acetate, 0.33 parts of palladium sulfate, 0.18 parts of copper sulfate, 7 parts of dilute sulfuric acid, 0.7 parts of potassium chloroplatinate, 12 parts of oleylamine, 18 parts of trioctylphosphine, N, 70 parts of N-diethylformamide, appropriate amount of deionized water for later use;

[0043] (2) Dissolve palladium sulfate in deionized water to obtain a palladium ion solution with a molar concentration of 2.5mol / L, then mix manganese acetate, oleylamine and trioctylphosphine evenly, start heating at room temperature, and raise the temperature to 230 °C , insulated for 2.7min to form a suspension, then dropwise add palladium sulfate solution, stir evenly, and insulate for 0.7h to form a composite suspension;

[0044] (3) Place the composite suspension in an airflow with an air velocity of 2m / min, cool the suspension to room temperature, and then use a centrifuge to centrifuge the suspension at a speed of 950rpm for 5 minutes. , obtai...

Embodiment 3

[0050] (1) Weigh 0.7 parts of chromium acetate, 0.4 parts of silver fluoride, 0.1 parts of copper sulfate, 6 parts of dilute sulfuric acid, 1.3 parts of potassium chloroplatinate, 15 parts of oleylamine, 30 parts of trioctylphosphine, N , 60 parts of mixed solvent of N-dimethylformamide and N,N-diethylformamide, appropriate amount of deionized water for use;

[0051] (2) Dissolve silver fluoride in deionized water to obtain a noble metal ion solution with a molar concentration of 1.5 mol / L, then mix the transition metal salt with oleylamine and trioctylphosphine evenly, start heating at room temperature, and heat up to 270 ℃, keep warm for 2 minutes to form a suspension, then add dropwise the precious metal salt solution, stir evenly, keep warm for 1.5 hours to form a composite suspension;

[0052] (3) Place the composite suspension in an airflow with an air velocity of 1.5m / min, cool the suspension to room temperature, and then use a centrifuge to centrifuge the suspension at...

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Abstract

The invention provides a catalyst with ultra-low platinum content for a fuel cell and a preparation method thereof. After heat treatment of a metal source and oleylamine and trioctylphosphine, a noblemetal salt is added dropwise and dried to form spherical nanoparticles, The nano-particles containing organic phase are loaded on the surface of graphite electrode and the organic phase is removed simultaneously by vacuum pre-sintering reduction. During the electrochemical treatment, copper is deposited on the surface of graphite electrode to form a monoatomic layer of copper. At last, platinum is replaced by potassium chloroplatinate to form a multilayered core-shell structure of transition metal-precious metal-platinum and finally the required catalyst is prepared by carbon loading. A monoatomic layer formed by underpotential deposition of copper is replaced by platinum, The thickness of the platinum layer can be controlled effectively, and the catalytic active sites on the surface of the platinum layer are not affected, so that the catalytic performance is guaranteed, the manufacturing cost of the catalyst is reduced, and the defects that the thickness of the platinum layer and thereduction of the surface active sites are difficult to be controlled by the catalyst with low platinum loading capacity are overcome.

Description

technical field [0001] The invention relates to the field of fuel cell materials, in particular to an ultra-low platinum content catalyst for fuel cells and a preparation method. Background technique [0002] Since traditional fossil fuels are non-renewable and cause serious environmental pollution during use, seeking environmentally friendly renewable energy is a severe task facing mankind in the 21st century. Proton Exchange Membrane Fuel Cell (PEMFC)) uses a polymer membrane as a solid electrolyte, which has the characteristics of high power density, high energy conversion efficiency, low temperature start-up, no pollution, light and small size, etc., and is especially suitable as a mobile power source. [0003] PEMFC is mainly composed of end plates, bipolar plates, membrane electrodes and other components. Membrane electrode is the core component of PEMFC, mainly composed of catalytic layer, gas diffusion layer and proton exchange membrane. Among them, the catalytic ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/8825H01M4/9041H01M4/9083H01M4/926Y02E60/50
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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