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Thermocompression-free composite electrode for direct methanol fuel cell and preparation method thereof

A methanol fuel cell and composite electrode technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of complicated processing or preparation processes, and achieve the effects of improving battery performance, reducing resistance and contact resistance, and good management

Active Publication Date: 2017-11-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of cumbersome processing or preparation processes of various parts of DMFC, thereby simplifying the process steps and reducing the processing and manufacturing costs, the invention provides a heat-free pressing composite electrode for direct methanol fuel cells and its preparation method

Method used

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  • Thermocompression-free composite electrode for direct methanol fuel cell and preparation method thereof
  • Thermocompression-free composite electrode for direct methanol fuel cell and preparation method thereof
  • Thermocompression-free composite electrode for direct methanol fuel cell and preparation method thereof

Examples

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Embodiment 1

[0049] This embodiment is an integrated flow field diffusion layer with three copper sintered porous plates in the form of gradually changing porosity, and its cross-sectional schematic diagram is as follows figure 2 shown. Among them, the three copper sintered porous plates include porous plate 8, porous plate 9 and porous plate 10 in turn, and the porosity of the three sintered porous plates is 90%, 80% and 70% in turn, forming a porous plate with a thickness of 1 mm. Plate; the filling layer 11 is attached to the side of the perforated plate 10 and part of its internal space.

[0050] The material of the cathode filling layer is a mixture of conductive carbon black and polytetrafluoroethylene with a mass ratio of 5:1, and the material of the anode filling layer is a mixture of conductive carbon black and perfluorosulfonic acid with a mass ratio of 10:1;

[0051] The material of the catalytic layer is a mixture of catalyst and perfluorosulfonic acid with a mass ratio of 3:...

Embodiment 2

[0054] This embodiment is an integrated flow field diffusion layer with three copper sintered porous plates in the form of gradually changing porosity. Among them, the porosity of the three sintered porous plates is 85%, 75% and 65% in turn, forming a porous plate with a thickness of 1.5 mm. The filling layer is attached to the side of the porous plate with a porosity of 65% and part of its internal space. .

[0055] The material of the cathode filling layer is a mixture of conductive carbon black and polytetrafluoroethylene with a mass ratio of 10:1, and the material of the anode filling layer is a mixture of conductive carbon black and perfluorosulfonic acid with a mass ratio of 5:1;

[0056] The material of the catalytic layer is a mixture of catalyst and perfluorosulfonic acid with a mass ratio of 1:1, and the catalytic layer is attached to the surface of the filling layer, thereby forming a heat-free and press-free composite electrode for direct methanol fuel cells.

[0...

Embodiment 3

[0059] This embodiment is an integrated flow field diffusion layer with two copper sintered porous plates in the form of gradually changing porosity. The porosity of the three sintered porous plates is 80%, 70% and 60% in turn, forming a porous plate with a thickness of 2 mm. The filling layer is attached to the side and part of the internal space of the porous plate with a porosity of 60%.

[0060] The material of the cathode filling layer is a mixture of conductive carbon black and polytetrafluoroethylene with a mass ratio of 20:1, and the material of the anode filling layer is a mixture of conductive carbon black and perfluorosulfonic acid with a mass ratio of 1:1;

[0061] The material of the catalytic layer is a mixture of catalyst and perfluorosulfonic acid with a mass ratio of 5:1, and the catalytic layer is attached to the surface of the filling layer, thereby forming a heat-free press composite electrode for direct methanol fuel cells.

[0062] The heat-free composite...

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Abstract

The invention discloses a thermocompression-free composite electrode for a direct methanol fuel cell and a preparation method thereof. The electrode comprises an integrated flow field diffusion layer and a catalytic layer; the integrated flow field diffusion layer comprises a substrate and a filling layer; the substrate is a metal fiber or metal powder sintered porous plate with a porosity gradient in a thickness direction; the filling layer is attached to one lateral surface of the substrate, which has a small porosity and part of an internal space; and the catalytic layer is attached to the surface of the filling layer. The preparation method of the thermocompression-free composite electrode for the direct methanol fuel cell, which is disclosed by the invention, comprises the following steps of: (1) preparation of the substrate; (2) preparation of the filling layer; (3) preparation of the integrated flow field diffusion layer; (4) preparation of the catalytic layer; and (5) preparation of the composite electrode. According the invention, integrated preparation of a flow field and a diffusion layer is proposed, a separate processing and flow field preparation process is omitted, a preparation process of a battery key component, i.e., a membrane electrode, is simplified, and the thermocompression-free composite electrode and the preparation method thereof have the characteristics of high efficiency and low cost.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a heat-free pressing composite electrode for direct methanol fuel cells and a preparation method thereof. Background technique [0002] At present, the energy crisis is becoming more and more serious, and the traditional chemical energy has disadvantages such as large environmental pollution and low energy utilization rate. Energy is continuously converted into electrical energy. Direct methanol fuel cell (DMFC) is a fuel cell that uses methanol and oxygen as raw materials. It has the advantages of relatively simple structure, convenient manufacture, high energy density, easy transportation and storage of fuel, and relatively safe fuel. It is a research hotspot of scientific research institutions and major companies. [0003] The structure of DMFC mainly includes end plate, collector plate, flow field plate and membrane electrode, and the membrane electrode is subdivided into diffusio...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/1011
CPCH01M4/8657H01M4/8807H01M4/8828H01M4/8882H01M8/1011Y02E60/50
Inventor 袁伟王奥宇叶光照韩福昌汤勇
Owner SOUTH CHINA UNIV OF TECH
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