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Preparation method and application of high-temperature membrane fuel cell gas diffusion electrode

A gas diffusion electrode, fuel cell technology, applied in fuel cells, battery electrodes, electrical components, etc., can solve the problems of membrane electrodes prone to deformation, poor performance, internal resistance, etc.

Inactive Publication Date: 2017-01-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can make the contact between the membrane and the catalytic layer closer, some studies have pointed out that the subsequent phosphoric acid doping step will easily deform the membrane electrode, making the actual assembly process difficult and easily causing a large internal resistance of the battery. Its performance is not as good as the membrane electrode prepared based on the gas diffusion electrode under the same Pt ​​loading (Journal of Power Sources 288(2015) 121-127)

Method used

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  • Preparation method and application of high-temperature membrane fuel cell gas diffusion electrode
  • Preparation method and application of high-temperature membrane fuel cell gas diffusion electrode
  • Preparation method and application of high-temperature membrane fuel cell gas diffusion electrode

Examples

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Embodiment 1

[0044] (1) Preparation of gas diffusion electrodes

[0045] Prepared according to the steps described in the summary of the present invention figure 1 A gas diffusion electrode free of microporous layers is shown. The size of the prepared gas diffusion electrode is 2.3cm×2.3cm. The gas diffusion back layer is Toray TGP-H-90 carbon paper, the hydrophobic agent is polytetrafluoroethylene (PTFE), and the mass percentage of PTFE in the carbon paper after treatment is 25wt.%. The catalyst used is JohnsonMatthey20wt.%Pt / C catalyst, and the Pt loading of the catalytic layer is 0.7mg / cm 2 ; The catalytic layer binder is also PTFE, and the percentage in the catalytic layer is 25wt.%.

[0046] (2) Preparation of Membrane Electrode Assembly

[0047] The electrolyte membrane is a phosphoric acid-doped ABPBI membrane with a size of 4cm×4cm and a phosphoric acid doping amount of 370wt.%. In the membrane electrode hot-pressing mold, place two prepared identical gas diffusion electrodes ...

Embodiment 2

[0051] The gas diffusion back layer is Toray UT70-30 carbon cloth, and the preparation and testing steps of other materials are the same as in Example 1. Test results such as image 3 shown. from image 3 It can be seen that the current density of the battery can reach 0.24A / cm under the working voltage of 0.6V 2 , the maximum power density reaches 0.50W / cm 2 .

Embodiment 3

[0053] The catalyst is Johnson Matthey 40wt.% Pt / C catalyst, and the preparation and testing steps of other materials are the same as in Example 1. Test results such as Figure 4 shown. from Figure 4 It can be seen that the current density of the battery can reach 0.27A / cm under the working voltage of 0.6V 2 , the maximum power density reaches 0.54W / cm 2 .

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Abstract

The invention discloses a high-temperature membrane fuel cell gas diffusion electrode structure and a preparation method thereof; the high-temperature membrane fuel cell gas diffusion electrode structure is characterized by not comprising a microporous layer and only comprising a gas diffusion back layer and a catalytic layer; the gas diffusion electrode herein is simple in structure and easy to prepare, and the gas diffusion back layer that is treated may deposit the catalytic layer directly on its surface to form the effective electrode structure; the gas diffusion electrode structure has better gas transport capacity, smaller electro transport resistance and lower preparation cost, and a new direction may be provided for improving properties of a high-temperature membrane fuel cell and modifying its parts.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a structure of a gas diffusion electrode for a high-temperature membrane fuel cell and a preparation method thereof. Background technique [0002] Today, with the depletion of global fossil energy and increasingly severe environmental problems, the research on hydrogen energy and fuel cell technology has been highly valued by countries all over the world. my country's "National Medium and Long-Term Science and Technology Development Plan (2006-2020)" puts fuel cells in an important development direction in many places, and lists the preparation of fuel cell basic key components and stack integration technology as cutting-edge technologies. Polyelectrolyte membrane fuel cell (PEMFC) is considered to be the most likely type of fuel cell used in electric vehicles and other applications, and the research on this type of fuel cell is a hot topic in this field. However, in practica...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/92H01M8/1007
CPCH01M4/8605H01M4/8647H01M4/8807H01M4/8825H01M4/8885H01M8/1018Y02E60/50
Inventor 苏华能徐谦李华明
Owner JIANGSU UNIV
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