Method for preparing direct liquid fuel cell membrane electrode

A technology of liquid fuel cells and membrane electrodes, which is applied to fuel cell components and other directions, and can solve the problems of severe catalyst ion coating and low catalyst utilization

Active Publication Date: 2013-10-23
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among these parameters, the amount of Nafion solution is determined according to the respective empirical parameters, resulting in an excessive amount, serious coating of catalyst ions, and low catalyst utilization.

Method used

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  • Method for preparing direct liquid fuel cell membrane electrode
  • Method for preparing direct liquid fuel cell membrane electrode
  • Method for preparing direct liquid fuel cell membrane electrode

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[0039] The invention provides a method for preparing a membrane electrode of a direct liquid liquid fuel cell, comprising: mixing Nafion solution, alcohol solvent, water and a catalyst, then spraying it on the transfer film to form a catalytic layer, and then transferring it to the Nafion film On, obtain membrane electrode; The volume V of described Nafion solution Nafion Satisfy V Nafion =ρ 1 *m 载量 *S / (ρ 2 *ω*ρ 3 *a); where, ρ 1 is the density of pure Nafion, ρ 2 is the density of Nafion solution, ρ 3 is the density of the catalyst, m 载量 is the loading capacity of the catalyst per unit area of ​​the membrane electrode, S is the total area of ​​the membrane electrode, ω is the mass fraction of the Nafion solution, and a is a natural number ranging from 0.5 to 1.

[0040] The present invention has no special limitation on the sources of all raw materials, which can be commercially available. Wherein, the Nafion solution is a Nafion solution well known to those skilled ...

Embodiment 1

[0055] 1.1 The loading of the anode and cathode catalysts are both set to 5mg / cm 2 , the anode catalyst is PtRu (1:1) black catalyst, the microscopic particle density is 16.9g / cm 3 , the cathode catalyst is a Pt black catalyst, and the microscopic particle density is 21.45g / cm 3 ; The volume ratio of PtRu (1:1) black catalyst microscopic particles to microscopic Nafion particles is 1:1.5, that is (5*10 -3 / 16.9): (V 1 *0.875*5% / 1.4S)=1:1.5, where V 1 is the volume of Nafion solution for anode, S is the electrode area to be sprayed, the mass fraction of commonly used Nafion solution is 5%, and the density is 0.875g / cm 3 , the density of pure Nafion is 1.4g / cm 3 , the volume of Nafion solution required by the anode can be calculated according to the electrode area; the volume ratio of Pt black catalyst microscopic particles to microscopic Nafion particles is 1:1.5, that is (5*10 -3 / 21.45): (V 2 *0.875*5% / 1.4S)=1:1.5, the volume V of Nafion solution required by the cathode...

Embodiment 2

[0065] 2.1 The loading of anode and cathode catalysts are both set to 5mg / cm 2 , the anode catalyst is PtRu (1:1) black catalyst, the microscopic particle density is 16.9g / cm 3 , the cathode catalyst is a Pt black catalyst, and the microscopic particle density is 21.45g / cm 3 ; The volume ratio of PtRu (1:1) black catalyst microscopic particles to microscopic Nafion particles is 1:1, that is (5*10 -3 / 16.9): (V 1 *0.875*5% / 1.4S)=1:1, where V 1 is the volume of Nafion solution for anode, S is the electrode area to be sprayed, the mass fraction of commonly used Nafion solution is 5%, and the density is 0.875g / cm 3 , the density of pure Nafion is 1.4g / cm 3 , the volume of Nafion solution required by the anode can be calculated according to the electrode area; the volume ratio of Pt black catalyst microscopic particles to microscopic Nafion particles is 1:1, that is (5*10 -3 / 21.45): (V 2 *0.875*5% / 1.4S)=1:1, the volume V of Nafion solution required by the cathode can be calc...

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Abstract

The invention provides a method for preparing a direct liquid fuel cell membrane electrode. The method comprises the following steps: mixing a Nafion solution, an alcohols solvent and water with a catalyst, then spraying the mixture onto a transfer membrane to form a catalyst layer, transferring onto a Nafion membrane so as to finally obtain the membrane electrode. The volume VNafion of the Nafion solution meets the formula as follows: VNafion=pl*m carrying capacity*S / (p2*Omega *p3*a). Compared with the prior art, the method is characterized in that a certain proportion between volumes of catalyst particles and Nafion particles is analyzed from microscopic view according to the carrying capacity of the catalyst of unit area of the membrane electrode, so that the volume of the Nafion solution meets the specified condition, the coating of the Nafion solution to the catalyst is reduced, the utilization rate of the catalyst in the catalyst layer is increased, and the electrochemical performance of a cell is improved. In addition, the catalyst layer is transferred onto the Nafion membrane with a transfer method, so that the combinability of the catalyst layer and the Nafion membrane can be improved, and therefore the resistance of the cell is reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a method for preparing membrane electrodes of direct liquid fuel cells. Background technique [0002] A fuel cell is a power generation device that converts chemical energy directly into electrical energy through an electrochemical reaction. Compared with traditional energy conversion systems, fuel cells have many advantages, such as: not limited by the Carnot cycle, high energy conversion efficiency; the product is usually water, and has little environmental pollution. Therefore, fuel cells have received increasing attention in recent years. [0003] A direct liquid fuel cell is a device that generates electricity through liquid fuels such as methanol, ethanol, formic acid, etc. through a membrane electrode composed of a proton exchange membrane and a catalyst electrode. Taking a direct methanol battery as an example, its working principle is as follows: [0004] Anode reac...

Claims

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Application Information

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IPC IPC(8): H01M8/02
CPCY02E60/50
Inventor 邢巍严亮刘长鹏廖建辉
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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