Gas diffusion electrode carried with double-shell core-shell catalyst and preparation and application thereof

A gas diffusion electrode, core-shell catalyst technology, applied in battery electrodes, circuits, electrical components, etc., to achieve the effect of enhanced stability, stable performance, and easy mass production

Active Publication Date: 2015-07-15
中科军联(张家港)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrode catalyst prepared by this method is limited to Cu, Co or Ni as the nanoparticle core, and since the core-shell structure occurs through a displacement reaction, if the control is not proper, the core will completely react to obtain a single-component catalyst instead of a core-shell structure. catalyst

Method used

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  • Gas diffusion electrode carried with double-shell core-shell catalyst and preparation and application thereof
  • Gas diffusion electrode carried with double-shell core-shell catalyst and preparation and application thereof
  • Gas diffusion electrode carried with double-shell core-shell catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Preparation of a gas diffusion electrode loaded with a Pt / Au / PdCo / C double-shell core-shell catalyst.

[0041] (1) Preparation of gas diffusion layer:

[0042] First, set the size to 2×2cm 2 Carbon paper (Toray TGP-060H) is weighed and completely immersed in 2wt.% PTFE emulsion for 30 seconds, then taken out, then dried with a hair dryer and weighed again, and the percentage of PTFE that has been leached is calculated accordingly content. Repeat the above impregnation and drying process until the PTFE load in the carbon paper is 10wt.%, then place the hydrophobized carbon paper in a muffle furnace, heat-treat at 340°C for 0.5h, take it out after cooling down to room temperature, and obtain a support layer.

[0043] Weigh 12mg XC-72 carbon powder, then add 20ml of ethanol, ultrasonically oscillate, and stir with a glass rod, disperse evenly and add 5wt.% Solution (DuPont, EW=1100) 24mg, make the slurry The content of the dry resin is 10wt.%. After sti...

Embodiment 12

[0060] Example 12: Preparation of gas diffusion electrode loaded with Pt / Au / PdNi / C double-shell core-shell catalyst.

[0061] (1) Preparation of gas diffusion layer: same as Example 1;

[0062] (2) Preparation of catalyst core:

[0063] a. Add 23mg Pd(NO 3 ) 2 , while adding 14.9mgNi(COOH) 2 (Pd / Ni atomic ratio is 1:1), stir to make it evenly mixed, then add 25mg BP2000 carbon powder to the mixed solution and ultrasonically disperse until the mixed solution is uniform;

[0064] b. Add 50mL of 0.010M sodium citrate aqueous solution dropwise to the mixture obtained in the above step (1)a, then slowly add 50mL of 0.1M NaBH4 solution dropwise under rapid stirring, let it stand for 30min and filter to obtain solid matter, then use deionized The obtained solid matter is washed with water, and the obtained matter after washing is placed in an 80° C. vacuum oven and dried for 5 h to obtain a PdNi / C catalyst;

[0065] c. put the PdNi / C obtained in step (1) b at 200°C, 10vol%H 2 A...

Embodiment 13

[0071] Example 13: Preparation of gas diffusion electrode loaded with Pt / Au / PdCu / C double-shell core-shell catalyst.

[0072] (1) Preparation of gas diffusion layer: same as Example 1;

[0073] (2) Preparation of catalyst core:

[0074] a. Add 115mg Pd(NO 3 ) 2 , while adding 16mgCuSO 4 (Pd / Cu atomic ratio is 5:1), stir to make it evenly mixed, then add 540mg acetylene black carbon powder to the mixed solution and ultrasonically disperse until the mixed solution is uniform;

[0075] b. Add 10mL of 0.050M sodium citrate aqueous solution dropwise to the mixture obtained in the above step (1)a, then slowly add 50mL of 0.1M NaBH4 solution dropwise under rapid stirring, let stand for 30min and filter to obtain solid matter, then use deionized Water is washed with gained solid matter, and the gained matter after washing is placed in 80 ℃ of vacuum ovens and dried 20h, obtains PdCu / C catalyst;

[0076] c. put the PdCu / C obtained in step (1) b at 600°C, 1vol%H 2 Alloyed PdCu / C c...

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Abstract

A gas diffusion electrode carried with a double-shell core-shell catalyst consists of a gas diffusion layer and a core-shell catalyst layer obtained on the gas diffusion layer in situ. A catalyst in the catalyst layer is the double-shell core-shell catalyst using a carbon-supported Pd alloy catalyst as a core, using Pt located on the surface as an outer shell and using Au located between the Pt shell and an alloying inner shell. A preparation method comprises three steps of (1) preparing the gas diffusion layer, (2) preparing the inner shell of the Pd alloy catalyst and (3) preparing the core-shell catalyst layer. When the gas diffusion electrode serves as a gas diffusion cathode for a metal air fuel cell, a proton exchange membrane fuel cell and a direct liquid fuel cell, the gas diffusion electrode has the advantages of being low in precious metal carrying capacity, high in utilization ratio, good in stability and the like, can remarkably reduce the fuel cell cost and is easily produced in a batch mode. In addition, the preparation method is simple and easy to operate.

Description

technical field [0001] The invention relates to a gas diffusion electrode loaded with a double-layer core-shell catalyst, in particular to a gas diffusion electrode used for metal-air fuel cell cathodes, proton exchange membrane fuel cell cathodes and direct liquid fuel cell cathodes. [0002] The present invention also relates to the preparation method and application of the above-mentioned gas diffusion electrode loaded with double-layer core-shell catalyst. Background technique [0003] With the increasing consumption of fuels such as coal, oil and natural gas and the depletion of energy resources, it is urgent to find energy technologies that are environmentally friendly and sustainable. Because of its high energy conversion efficiency, no pollution, no noise and other advantages, fuel cells have become a research hotspot all over the world. [0004] Currently, Pt and its alloy catalysts are still the most effective catalysts for the fuel cell cathode oxygen reduction r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/86
CPCY02E60/50
Inventor 孙公权
Owner 中科军联(张家港)新能源科技有限公司
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