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Preparation method of efficient 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 the problems of low durability and high cost, and achieve the effects of improving durability, improving utilization rate, slowing down loss and agglomeration

Active Publication Date: 2018-10-19
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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  • Preparation method of efficient stable Pt/GC catalyst
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  • Preparation method of efficient stable Pt/GC catalyst

Examples

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Effect test

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 an alcoholic aqueous solution, and ultrasonically disperse it in an ice-water bath for 1-2h to obtain a graphitized carbon dispersion solution; the alcoholic aqueous 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 0.0196mol / L of chloroplatinic acid After continuing to stir the ethanol solution for 5-10 minutes, use an alkaline reagent of 0.1 mol / L NaOH solution to adjust the pH value to greater than 8. 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 an alcoholic aqueous solution, and ultrasonically disperse it in an ice-water bath for 1-2h to obtain a graphitized carbon dispersion solution; the alcoholic aqueous solution is ethanol and deionized water according to the volume ratio V:V = the mixed solution of 0.5:2;

[0039] Step 2) Preparation of Pt precursor sol: Nafion (5wt%) solution is added in alcoholic aqueous solution (the volume ratio of Nafion solution and alcoholic aqueous solution is 5:20, after stirring 0.5-1h, add the chloroplatinic acid of 0.0392mol / L 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, ...

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 an alcoholic aqueous solution, and ultrasonically disperse it in an ice-water bath for 1-2h to obtain a graphitized carbon dispersion solution; the alcoholic aqueous 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 (volume ratio of Nafion solution to alcohol aqueous solution is 10:20), stir for 0.5-1h and then add 0.0588mol / L of chloroplatinic acid After continuing to stir the ethanol solution for 5-10 minutes, use an alkaline reagent of 0.1 mol / L NaOH solution to adjust the pH value to greater than 8. 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 w...

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Abstract

The invention relates to a preparation method of an efficient stable Pt / GC catalyst. The preparation method comprises the following steps: 1) evenly dispersing graphitized carbon into an alcohol-watersolution to prepare a graphitized carbon dispersion solution; 2) adding a Nafion solution into the alcohol-water solution, stirring evenly, adding chloroplatinic acid or sodium chloroplatinate solution, continuing to stir, and regulating the pH value; 3) enabling the mixed solution to condensate and reflow to prepare a Pt precursor sol; 4) adding the graphitized carbon dispersion solution into the Pt precursor sol, continuing to condensate and reflow, cooling an obtained Pt loaded graphitized carbon colloid to the room temperature after finishing the reaction, filtering and washing a product,and drying in vacuum to the constant weight to obtain the stable Pt / GC catalyst. The preparation method of the efficient stable Pt / GC catalyst has the following beneficial effects that: 1) the use ratio of Pt is increased; 2) Pt particles are enabled to be evenly stably distributed on a graphitized carbon carrier on the nanoscale; and 3) the catalyst is enabled to be more excellent in corrosion resistance and environment 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, in the actual operation of fuel cells, extreme environments such as high humidification, low pH and high potential will lead to electrochemical corrosion of the carbon support material in th...

Claims

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Application Information

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Patent Type & Authority Applications(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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