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A direct methanol fuel cell membrane electrode for improving catalyst utilization and its preparation method

A methanol fuel cell and utilization rate technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of large electrochemical reaction resistance of electrodes, catalyst inoperability, and proton inability to transfer, etc., so as to reduce preparation costs and improve utilization rate , Highly hydrophilic effect

Active Publication Date: 2021-11-09
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the current work focuses on the modification of catalyst support or catalyst layer structure, but the problem of battery performance degradation caused by catalyst sinking caused by assembly pressure, methanol flow, gas flow remains to be solved
When the battery runs for a period of time, some catalysts cannot Ion polymer contacts, so that the protons cannot be transferred, and the catalyst cannot work, so the electrode has a large electrochemical reaction resistance, resulting in a decline in battery performance

Method used

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  • A direct methanol fuel cell membrane electrode for improving catalyst utilization and its preparation method
  • A direct methanol fuel cell membrane electrode for improving catalyst utilization and its preparation method
  • A direct methanol fuel cell membrane electrode for improving catalyst utilization and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0059] according to figure 2 The process and process shown are used to prepare direct methanol fuel cell electrodes and membrane electrodes with improved catalyst utilization, and conduct discharge tests. The main steps are as follows:

[0060] (1) Preparation of electrodes

[0061] Carbon paper containing polytetrafluoroethylene (PTFE) is used as a diffusion layer, and a microporous layer 2 containing PTFE is coated on the hydrophobic diffusion layer, wherein the content of polytetrafluoroethylene is 15 wt.%. A microporous layer 3 containing Nafion is coated on the outer microporous layer, wherein the content of Nafion is 30wt.%. Prepare the appropriate proportion of catalyst slurry, using isopropanol as solvent. Use PtRu / C as a catalyst on the anode side and Pt / C as a catalyst on the cathode side, and spray catalyst slurry on the microporous layer 3 containing Nafion to form a catalyst layer.

[0062] (2) Treatment of proton exchange membrane

[0063] The membrane was e...

Embodiment 2

[0069] The direct methanol fuel cell membrane electrode of the catalyst utilization rate of the present invention is tested under the conditions of high concentration methanol and dry oxygen. First, a double microporous layer electrode was prepared according to the same procedure as in Example 1.

[0070] The obtained membrane electrode assembly and sealing air cushion were assembled in a single cell and then tested. The test conditions were: cell operating temperature 60°C, normal pressure, anode fuel 2M methanol (flow rate 3ml min -1 ), the cathode air intake is dry oxygen (the flow rate is 199ml min -1 ). The limiting current density can reach 500.21mA cm -2 , the maximum power density reaches 76.29mW cm -2 , Example 2 increased by 41.01% compared to Comparative Example 2.

Embodiment 3

[0072] The direct methanol fuel cell membrane electrode of the catalyst utilization rate of the present invention is tested under the conditions of low concentration of methanol and humidified oxygen. First, a double microporous layer electrode was prepared according to the same procedure as in Example 1.

[0073] The obtained membrane electrode assembly and sealing air cushion were assembled in a single cell and then tested. The test conditions were: cell operating temperature 60°C, normal pressure, anode fuel 0.5M methanol (flow rate 3ml min -1 ), the cathode air intake is humidified oxygen (relative humidity is 60%, flow rate is 199ml min -1 ). The limiting current density can reach 135.05mA cm -2 , the maximum power density reaches 29.12mW cm -2 , Compared with Comparative Example 3, Example 3 has improved by 97.38%.

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Abstract

The invention discloses a direct methanol fuel cell membrane electrode capable of improving catalyst utilization and a preparation method thereof, and relates to the technical field of fuel cells. In the fuel cell membrane electrode prepared by the method of the invention, the microporous layer has a double-layer structure. It includes an outer microporous layer comprising a hydrophobic polymer, and an inner microporous layer comprising a proton-conducting polymer. This double microporous layer structure has a high three-phase reaction interface and electrochemical reaction area, which can effectively reduce the material transport resistance inside the electrode, effectively improve the utilization rate of the catalyst, thereby improving the discharge performance of the electrode and prolonging the life of the battery. Through the single cell performance test, the membrane electrode prepared by the preparation method of the present invention is significantly improved in monomer performance compared with the membrane electrode prepared by the traditional method.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a direct methanol fuel cell membrane electrode capable of improving catalyst utilization and a preparation method thereof. Background technique [0002] Direct Methanol Fuel Cell (DMFC) is a power generation device that can continuously and directly convert the chemical energy in fuel and oxidant into electrical energy. Due to its environmental protection and high efficiency, it has attracted worldwide attention. Methanol fuel cells directly use methanol or methanol aqueous solution as the anode fuel, and oxygen or air as the oxidant. Because of its wide source of methanol, easy to carry, convenient storage and replenishment, high volume and mass specific energy, simple structure, no need for external reforming equipment, etc., it has broad applications in portable power supplies, small civil power supplies and vehicle power supplies. Application prospects. [0003] Membrane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1004H01M4/88
CPCH01M4/8807H01M4/8828H01M4/8875H01M4/8882H01M8/1004Y02E60/50
Inventor 徐谦孙巍马强张玮琦苏华能
Owner JIANGSU UNIV
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