Composite carbon fibre paper used for diffusion layer of electrode in ion-exchange membrane fuel battery and its preparing process

A fuel cell electrode and ion exchange membrane technology, which is applied in the field of fuel cell electrode materials and their preparation, can solve the problems of affecting the electrochemical performance of ion exchange membrane fuel cell electrodes, unreasonable pore structure of carbon paper, and insufficient specific surface area, etc. Achieve the effect of good electrical conductivity, reasonable porosity and large specific surface area

Inactive Publication Date: 2006-03-29
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

The pore structure of the carbon paper produced by the previous technology is not reasonable enough, the specific surface area is not large enough and the flexibility is poor. At the same time, the hydrophilic and hydrophobic properties of both sides are the same, and there is no directional drainage and gas transmission function, which affects the electrochemical performance of the ion exchange membrane fuel cell electrode.

Method used

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  • Composite carbon fibre paper used for diffusion layer of electrode in ion-exchange membrane fuel battery and its preparing process
  • Composite carbon fibre paper used for diffusion layer of electrode in ion-exchange membrane fuel battery and its preparing process

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Embodiment Construction

[0026] The ion-exchange membrane fuel cell electrode diffusion layer provided by the invention is activated carbon fiber and carbon powder after twice activation or electrochemical treatment as the conductive phase, with natural or synthetic cellulose pulp as the matrix, adding an appropriate amount of dispersant And other additives such as pore-forming agents, made by two times of slurry.

[0027] The composite paper of the present invention is composed of 2-10% cellulose pulp as the matrix weight, 80-95% carbon fiber and 0-10% carbon powder weight, wherein the carbon fiber and carbon powder are activated twice, and the carbon fiber accounts for 60-90% of the matrix weight is the preferred content range.

[0028] The carbon fiber can be one of polyacrylonitrile carbon fiber, pitch-based carbon fiber, viscose-based carbon fiber, activated carbon fiber, graphite fiber, vapor-phase grown carbon fiber or a mixed carbon fiber material, and the effect of pitch-based carbon fiber as...

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Abstract

A composite carbon fibre paper for the diffusion layer of electrode in fuel battery with ion exchange membrane is prepared from cellulose pulp, activated carbon fibre and carbon power through chemically activating carbon fibre and carbon powder, physically activating, cutting carbon fibre filaments, dispersing in the aqueous solution of disperser, preparing paper pulp, proportionally mixing the carbon fibre dispersed liquid wich pulp, adding hydrophilic or hydrophobic surfactant and conventionally making paper. Its advantages include high electric conductivity and air permeability, high specific surface area, reasonable porosity and directional water discharge and gas delivery function.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrode materials and its preparation, in particular to a carbon fiber composite paper required for an ion exchange membrane fuel cell electrode diffusion layer and a preparation method thereof. technical background [0002] As a device that directly converts chemical energy into electrical energy, the ion exchange membrane fuel cell has become a new generation of power generation technology due to its high efficiency, low pollution, and short start-up time and will enter the practical stage of commercialization. Since the electrode reaction of the ion exchange membrane fuel cell is mainly carried out on the gas-liquid-solid three-phase interface, its core problem is to improve the reactivity of gaseous fuel and oxidant in the electrode process and the life of the fuel cell, reactivity and Battery life is determined by the materials of construction. Therefore, the selection of electrode mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/86H01M4/88
CPCY02E60/50Y02E60/12Y02E60/10
Inventor 汪树军张伟刘红研赵永丰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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