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A kind of preparation method of efficient and stable pt/gc catalyst

A catalyst and stable technology, applied in the field of preparation of high-efficiency and stable Pt/GC catalysts for fuel cells, can solve problems such as high cost and low durability, achieve improved utilization, high corrosion resistance and environmental tolerance, and slow down loss and reunion effect

Active Publication Date: 2021-12-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to propose a preparation method of an efficient and stable Pt / GC catalyst for the high cost and low durability of the current fuel cell Pt-based catalyst, which effectively improves the durability of the Pt-based catalyst

Method used

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  • A kind of preparation method of efficient and stable pt/gc catalyst
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  • A kind of preparation method of efficient and stable pt/gc catalyst

Examples

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Embodiment 1

[0028] A preparation method for efficient and stable Pt / GC catalyst, comprising the following steps:

[0029] Step 1) Preparation of carbon slurry: disperse the graphitized carbon in the aqueous alcohol solution, and disperse it ultrasonically in an ice-water bath for 1-2 hours to obtain a graphitized carbon dispersion solution; the aqueous alcohol solution is ethanol and deionized water according to the volume ratio V:V =1:1 mixed solution;

[0030] Step 2) Preparation of Pt precursor sol: add Nafion solution (5wt%) to alcohol aqueous solution (the volume ratio of Nafion solution to alcohol aqueous solution is 1:20), stir for 0.5-1h and then add 0.0196 mol / L chloroplatinic acid After continuing to stir the ethanol solution for 5-10 minutes, adjust the pH value to be greater than 8 with an alkaline reagent of 0.1 mol / L NaOH solution. After the mixed solution was condensed and refluxed for 2 hours, the solution changed from light yellow to dark brown, and the Pt precursor sol ...

Embodiment 2

[0037] A preparation method for efficient and stable Pt / GC catalyst, comprising the following steps:

[0038] Step 1) Preparation of carbon slurry: disperse the graphitized carbon in the aqueous alcohol solution, and disperse it ultrasonically in an ice-water bath for 1-2 hours to obtain a graphitized carbon dispersion solution; the aqueous alcohol solution is ethanol and deionized water according to the volume ratio V:V =0.5:2 mixed solution;

[0039] Step 2) Preparation of Pt precursor sol: add Nafion (5wt%) solution to alcohol aqueous solution (volume ratio of Nafion solution to alcohol aqueous solution is 5:20, stir for 0.5-1h and add 0.0392mol / L of chloroplatinic acid After the ethanol solution continued to stir for 5-10 minutes, the pH value was adjusted to be greater than 8 with an alkaline reagent of 0.1 mol / L NaOH solution. After the mixed solution was condensed and refluxed for 2 hours, the solution changed from light yellow to dark brown, and the Pt precursor Sol; ...

Embodiment 3

[0042] A preparation method for efficient and stable Pt / GC catalyst, comprising the following steps:

[0043] Step 1) Preparation of carbon slurry: disperse the graphitized carbon in the aqueous alcohol solution, and disperse it ultrasonically in an ice-water bath for 1-2 hours to obtain a graphitized carbon dispersion solution; the aqueous alcohol solution is ethanol and deionized water according to the volume ratio V:V =0.75:1 mixed solution;

[0044] Step 2) Preparation of Pt precursor sol: add Nafion solution (5wt%) to alcohol aqueous solution (the volume ratio of Nafion solution to alcohol aqueous solution is 10:20), stir for 0.5-1h and then add 0.0588mol / L chloroplatinic acid After continuing to stir the ethanol solution for 5-10 minutes, adjust the pH value to be greater than 8 with an alkaline reagent of 0.1 mol / L NaOH solution. After the mixed solution was condensed and refluxed for 2 hours, the solution changed from light yellow to dark brown, and the Pt precursor s...

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Abstract

The invention relates to a method for preparing a highly efficient and stable Pt / GC catalyst, comprising the following steps: 1) uniformly dispersing graphitized carbon in an aqueous alcohol solution to obtain a dispersed solution of graphitized carbon; 2) adding Nafion solution to the aqueous alcohol solution Stir evenly, add chloroplatinic acid or sodium chloroplatinate solution and continue stirring to adjust the pH value; 3) The mixed solution is condensed and refluxed to obtain the Pt precursor sol; 4) The graphitized carbon dispersion solution is added to the Pt precursor sol, and continue Condensation and reflux, after the reaction, cool the obtained Pt-loaded graphitized carbon colloid to room temperature, filter and wash the product, and vacuum-dry it to constant weight to obtain the obtained product. The invention has the following beneficial effects: 1) The utilization rate of Pt is improved. 2) Ensure that the Pt particles are uniformly and stably distributed on the graphitized carbon support in nanometer size. 3) It ensures that the catalyst has higher corrosion resistance and environmental tolerance.

Description

technical field [0001] The invention relates to the field of fuel cell catalysts, in particular to a preparation method of a high-efficiency and stable Pt / GC catalyst for fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an electrochemical energy conversion device that directly converts the chemical energy in hydrogen and oxygen into electrical energy. It has high energy conversion efficiency, is environmentally friendly, and hardly emits nitrogen oxides and sulfur oxides. Harmful gases such as carbon dioxide and carbon dioxide or greenhouse gases are considered to be one of the preferred clean and efficient power generation technologies in the future. Currently, PEMFC cathode oxygen reduction catalysts are mainly commercial Pt / C catalysts. However, during the actual operation of fuel cells, extreme environments such as high humidification, low pH, and high potential will cause electrochemical corrosion of the carbon support material in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/926Y02E60/50
Inventor 李赏邢以晶郭伟朱从懿潘牧
Owner WUHAN UNIV OF TECH
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