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Porous platinum fuel cell catalyst and preparation method thereof

A fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced activity, increased volume, weight and cost of fuel cell stacks, achieve high platinum utilization, prevent oxidation, and simplify the preparation process Effect

Inactive Publication Date: 2020-04-28
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the deficiencies of the prior art, and aims to solve the problem that the activity of platinum on the membrane electrode per unit area is reduced by reducing the loading of platinum in the prior art. To achieve the same activity, a larger membrane electrode is required, which will make the fuel cell stack Technical issues of increased size, weight and cost

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  • Porous platinum fuel cell catalyst and preparation method thereof

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Embodiment 1

[0024] This embodiment discloses a method for preparing a porous platinum fuel cell catalyst, comprising the following steps:

[0025] Step (1) Dissolve chloroplatinic acid in water, the molar concentration of chloroplatinic acid is 12mmol / L, add polyvinylpyrrolidone, the ratio of the molar weight of polyvinylpyrrolidone to platinum molar weight is 10:1, that is, polyvinylpyrrolidone and The molar ratio of the amount of platinum metal is 10:1. Stir at 800 rpm for 60 minutes at room temperature to obtain a platinum metal salt aqueous solution;

[0026] Step (2) Add 2 mol / L sodium borohydride aqueous solution to the platinum metal salt aqueous solution system in step (1) while bubbling nitrogen gas, and stir at 800 rpm for 30 minutes at normal temperature; wherein, the sodium borohydride aqueous solution is added to the platinum metal salt aqueous solution After the system, the molar concentration of sodium borohydride in the solution system is 0.33mol / L;

[0027] Step (3) Con...

Embodiment 2

[0032] This embodiment discloses a method for preparing a porous platinum fuel cell catalyst, comprising the following steps:

[0033] Step (1) chloroplatinic acid and nickel nitrate hexahydrate are dissolved in water, wherein, the molar concentration of chloroplatinic acid is 3mmol / L, and the molar concentration of nickel nitrate hexahydrate is 9mmol / L; Add polyvinylpyrrolidone, polyvinylpyrrolidone The ratio of the molar weight of polyvinylpyrrolidone to the total molar weight of platinum and nickel is 10:1, that is, the molar ratio of polyvinylpyrrolidone to the total metal weight of platinum and nickel is 10:1. Stir at 800 rpm for 60 minutes at room temperature to obtain a platinum salt-nickel metal salt mixed aqueous solution system;

[0034] Step (2) Add 2mol / L sodium borohydride aqueous solution to the platinum salt-nickel metal salt mixed aqueous solution system of step (1) and blow nitrogen into it while stirring at a speed of 800 rpm for 30 min at normal temperature;...

Embodiment 3

[0039] This embodiment discloses a method for preparing a porous platinum fuel cell catalyst, comprising the following steps:

[0040] Step (1) chloroplatinic acid and nickel nitrate hexahydrate are dissolved in water, wherein, the molar concentration of chloroplatinic acid is 4mmol / L, and the molar concentration of nickel nitrate hexahydrate is 8mmol / L; Add polyvinylpyrrolidone, polyvinylpyrrolidone The ratio of the molar weight of polyvinylpyrrolidone to the total molar weight of platinum and nickel is 10:1, that is, the molar ratio of polyvinylpyrrolidone to the total metal weight of platinum and nickel is 10:1. Stir at 800 rpm for 60 minutes at room temperature to obtain a platinum salt-nickel metal salt mixed aqueous solution system;

[0041] Step (2) Add 2mol / L sodium borohydride aqueous solution to the platinum salt-nickel metal salt mixed aqueous solution system of step (1) and blow nitrogen into it while stirring at a speed of 800 rpm for 30 min at normal temperature;...

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Abstract

The invention discloses a preparation method of a porous platinum fuel cell catalyst. The preparation method comprises the following steps that: platinum salt and non-platinum metal salt are dissolvedin water, polyvinylpyrrolidone is added, stirring is performed, a platinum salt-non-platinum metal salt mixed aqueous solution system can be obtained; in a nitrogen atmosphere, a reducing agent is added into the platinum salt-non-platinum metal salt mixed aqueous solution system, and stirring is performed; after metal in the solution system is completely reduced, a carrier is added; after the metal is completely supported, centrifugal washing and drying are performed, so that a supported type platinum alloy catalyst is obtained; the supported platinum alloy catalyst is added into an acidic solution so as to be subjected to acid treatment; and centrifugal washing and drying are performed, so that the porous platinum fuel cell catalyst is obtained. The invention also discloses a porous platinum fuel cell catalyst. The porous platinum catalyst obtained by the dealloying method has higher metal dispersity, i.e., the catalyst has the advantages of high platinum utilization rate and higherfuel cell catalytic activity.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to the technical field of porous fuel catalysts. Background technique [0002] Due to the long-term burning of fossil fuels by humans, the earth is facing a growing greenhouse effect. Traditional internal combustion engines emit a large amount of carbon dioxide into the atmosphere every year. Due to the implementation of policies and regulations in recent years, internal combustion engine vehicles will gradually be replaced by new energy vehicles. At present, the mainstream new energy vehicles are lithium-ion battery vehicles. However, lithium-ion battery vehicles have technical barriers that cannot be overcome, that is, their cruising range is short and charging time is long. Hydrogen fuel cell vehicles are the development trend of new energy vehicles. With their zero-carbon emissions and fast refilling characteristics, they have gradually become a hot industry in technology res...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/921H01M4/926Y02E60/50
Inventor 赵羽梁燕王光应徐辉崔鹏
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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