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Modified catalyst, membrane electrode and preparation method thereof, and fuel cell

A catalyst and membrane electrode technology, applied in the field of modified catalysts, membrane electrodes and their preparation methods and fuel cells, can solve problems such as poor durability of catalysts or catalyst layers, reduce the number of defects, reduce oxygen content, and achieve large-scale The effect of preparation

Pending Publication Date: 2022-04-12
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of poor durability of the catalyst or catalyst layer in the prior art, thereby providing a modified catalyst, membrane electrode and its preparation method and fuel cell

Method used

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  • Modified catalyst, membrane electrode and preparation method thereof, and fuel cell
  • Modified catalyst, membrane electrode and preparation method thereof, and fuel cell
  • Modified catalyst, membrane electrode and preparation method thereof, and fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Add 50 mg of commercial Pt / C catalyst (JM (Johnson Matthey, Johnson) 60% Pt / C) to the polytetrafluoroethylene reactor liner, ultrasonically disperse in 50 mL deionized water, and the ultrasonic frequency is 50 kHz, Ultrasound continued for 10 minutes; 6.4 mg of potassium borohydride was added to the above dispersion and stirred at a stirring rate of 500 rpm for 30 minutes; Aged for 6 hours, cooled to room temperature, then collected by centrifugation at 10,000 rpm, and dried at 80°C for 6 hours to obtain a highly stable platinum-carbon catalyst, which was designated as Pt / C-1.

[0059] After X-ray photoelectron spectroscopy (XPS) analysis, the oxygen content on the carbon carrier surface of Pt / C-1 is 5.71 at.%; the average particle diameter of platinum particles is 3.40nm. Pt / C-1 platinum metal particles have few defects and regular appearance, specifically as figure 1 As shown, compared with commercial Pt / C, the defects of Pt / C-1 in this example are significantly redu...

Embodiment 2

[0062] The modification method of the catalyst in Example 2 is basically the same as in Example 1, except that the mass of potassium borohydride is changed to 3.2 mg to obtain a highly stable platinum carbon catalyst, which is denoted as Pt / C-2.

[0063] After X-ray photoelectron spectroscopy (XPS) analysis, the oxygen content on the surface of the Pt / C-2 carbon carrier is 6.90 at.%, and the average particle diameter of the platinum particles is 3.30nm.

Embodiment 3

[0065] Add 50 mg of commercial PtCo / C catalyst to the polytetrafluoroethylene reactor liner, ultrasonically disperse it in 50 ml of methanol, the ultrasonic frequency is 100KHz, and the ultrasonic wave lasts for 10 minutes; add 15 mg of citric acid to the above dispersion, Stirring, the stirring rate is 500rpm, and the stirring time is 30min; then the obtained reaction kettle with the mixed solution is placed in an oven at a reaction temperature of 160°C for 10 hours, then cooled to room temperature, and then collected by centrifugation at 5000rpm, 100 ℃ drying for 6 hours to obtain a highly stable PtCo / C catalyst, denoted as PtCo / C-3.

[0066] Then take 30mg of the PtCo / C-3 obtained above, and ultrasonically disperse it into 30ml of methanol solution with perfluorosulfonic acid resin (the mass ratio of PtCo / C-5 catalyst to perfluorosulfonic acid resin is 6:40) to configure For the slurry, the ultrasonic frequency is 100kHz, the ultrasonic time is 30min, and the ultrasonic tem...

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Abstract

The invention provides a modified catalyst, a membrane electrode, a preparation method of the membrane electrode and a fuel cell, belongs to the field of fuel cells, and solves the defect of poor durability of a catalyst or a catalyst layer in the prior art. The modification method of the catalyst comprises the following steps: mixing a catalyst comprising a carrier and metal particles loaded on the carrier, a reducing agent and a first solvent to obtain a mixed solution, carrying out thermal reduction treatment on the mixed solution, and carrying out solid-liquid separation to obtain the modified catalyst.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a modified catalyst, a membrane electrode, a preparation method thereof, and a fuel cell. Background technique [0002] With the increasing environmental protection requirements and the depletion of fossil energy, hydrogen energy is increasingly favored by the society. Since it does not produce polluting gases or emit greenhouse gases during its utilization, it is an ideal form of clean energy utilization. Fuel cell is an efficient energy conversion device, which has the advantages of clean and pollution-free, high conversion efficiency and high power density, and has become the research focus in the field of clean energy utilization technology. However, the lifetime of fuel cells is a key factor limiting commercialization. The latest standard issued by the US Department of Energy (DOE) requires that the steady-state operating life of fuel cells needs to exceed 40,000 hours...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M8/1004
CPCY02E60/50
Inventor 叶青郭志远宋洁徐桂芝邓占锋
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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