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A kind of ptagco/c nano flower structure catalytic material and preparation method thereof and application as fuel cell catalyst

A technology of catalytic materials and nano-carbon materials, which is applied in the field of fuel cell catalysts, can solve problems such as failure to meet DOE standards, affect platinum active sites, and fast ECSA decay, and achieve improved load stability, good dispersion, and platinum content. low effect

Active Publication Date: 2020-11-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method introduces reducing agents such as sodium borohydride and methanol, which not only pollute the environment, but also affect the active sites of platinum.
And judging from its stability test, only 500 cycles have been performed, and the ECSA decays relatively quickly, which is far from reaching the current DOE standard

Method used

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  • A kind of ptagco/c nano flower structure catalytic material and preparation method thereof and application as fuel cell catalyst
  • A kind of ptagco/c nano flower structure catalytic material and preparation method thereof and application as fuel cell catalyst
  • A kind of ptagco/c nano flower structure catalytic material and preparation method thereof and application as fuel cell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Configuration of metal precursor liquid:

[0041] According to the molar ratio of Pt:Ag:Co=1:1:1, the precursors chloroplatinic acid, silver nitrate, and cobalt acetate were respectively weighed and dissolved in the aqueous solution, and the ultrasonic dispersion was good, which was recorded as A solution;

[0042] Second, the configuration of the carrier solution:

[0043]Disperse the carbon carrier in ethanol, and ultrasonically disperse it evenly, and record it as B solution;

[0044] 3. Hydrothermal reaction

[0045] After mixing A and B solutions evenly, use ammonia solution to adjust the pH to weakly alkaline to obtain C solution (the volume ratio of water and ethanol is 1:1), which is placed in a hydrothermal reaction kettle, wherein the total mass fraction of metal ions is 0.01wt%, and the mass fraction of carbon carrier is 0.05wt%. Reaction at 140°C for 6h.

[0046] Four, washing and drying

[0047] 4) After the reaction was completed and cooled to room...

Embodiment 2

[0051] 1. Configuration of metal precursor liquid:

[0052] According to the molar ratio of Pt:Ag:Co=1:3:2, the precursors chloroplatinic acid, silver nitrate, and cobalt acetate were weighed and dissolved in the aqueous solution, and the ultrasonic dispersion was good, which was recorded as A solution;

[0053] Second, the configuration of the carrier solution:

[0054] Carbon support and SiO 2 The nanospheres were dispersed in ethanol, and ultrasonically dispersed to make them uniformly dispersed, which was recorded as B solution;

[0055] 3. Hydrothermal reaction

[0056] After mixing A and B solutions evenly, use ammonia solution to adjust the pH to weakly alkaline to obtain C solution (the volume ratio of water and ethanol is 1:1), which is placed in a hydrothermal reaction kettle, and the total mass fraction of metal ions in it is is 0.02wt%, and the mass fraction of the carbon carrier is 0.1wt%. Reaction at 160°C for 6h.

[0057] Four, washing and drying

[0058] ...

Embodiment 3

[0062] 1. Configuration of metal precursor liquid:

[0063] According to the molar ratio of Pt:Ag:Co=1:2:2, the precursors chloroplatinic acid, silver nitrate, and cobalt acetate were weighed and dissolved in the aqueous solution, and the ultrasonic dispersion was good, which was recorded as A solution;

[0064] Second, the configuration of the carrier solution:

[0065] Disperse the carbon carrier in ethanol, and ultrasonically disperse it evenly, and record it as B solution;

[0066] 3. Hydrothermal reaction

[0067] Mix A and B solutions uniformly to obtain liquid C (the volume ratio of water and ethanol is 1:1), which is placed in a hydrothermal reaction kettle, wherein the total mass fraction of metal ions is 0.02wt%, and the mass fraction of carbon support is 0.1 wt%. Reaction at 180°C for 6h.

[0068] Four, washing and drying

[0069] 4) After the reaction was completed and cooled to room temperature, the supernatant was discarded by centrifugation, and then poured...

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Abstract

The invention discloses PtAgCo / C nano flower-structured catalytic material, a preparation method thereof and application thereof as a fuel cell catalyst. The PtAgCo / C nano flower-structured catalyticmaterial is formed by loading platinum-silver-cobalt alloy with nano flower structure to the surface of nano carbon material. The preparation method includes: mixing well an aqueous solution of platinum source, silver source and cobalt source with an alcohol solution in which nano carbon material is dispersed, transferring the mixture into a high-pressure reactor, allowing hydrothermal reaction, pickling the product, and washing with water to obtain PtAgCo / C nano flower-structured catalytic material. The PtAgCo / C nano flower-structured catalytic material has high redox activity, and has high stability in an acid environment, and may act as a fuel cell catalyst.

Description

technical field [0001] The present invention relates to a fuel cell catalyst material, in particular to a PtAgCo / C nano flower structure material and a method for preparing a PtAgCo / C nano flower structure material by using a hydrothermal method, and also relates to a PtAgCo / C nano flower structure material as a fuel The application of the battery catalyst belongs to the field of fuel cell catalysts. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are considered to be one of the most promising energy sources for transportation and mobile electronics applications due to their advantages of high energy density, high efficiency, and zero emissions. Currently, Pt-based nanoparticles supported on porous carbon particles are the only oxygen reduction (ORR) electrocatalysts currently used in commercial PEMFCs, as Pt supported on carbon has the highest catalytic performance for oxygen among all pure metals. active. Currently, many researchers are working...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/88H01M4/921H01M4/926Y02E60/50
Inventor 梁伊丽邓晓婷谢志勇
Owner CENT SOUTH UNIV
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