Method for starting and operating fuel cell of hydrogen-air proton exchange membrane under non-humidifying condition

A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell additives, fuel cell control, etc., to achieve the effect of ensuring start-up and stable operation

Active Publication Date: 2018-05-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0005] In order to make up for some problems in the start-up and operation of the existing source humidification technology and non-humidifi

Method used

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  • Method for starting and operating fuel cell of hydrogen-air proton exchange membrane under non-humidifying condition
  • Method for starting and operating fuel cell of hydrogen-air proton exchange membrane under non-humidifying condition

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[0019] Example 1:

[0020] The fuel cell system 8 includes a fuel cell 1 , a load 2 , and a circulating cold shortage system 3 .

[0021] (1) The fuel cell 1 is composed of ten single cells. During its operation, the intake mode of hydrogen and air is countercurrent intake, the air is fed into the fuel cell 1 by the air mass flow controller 4, and the air metering ratio is set to 1.5 , the air tail is discharged from the air outlet 7, the hydrogen is passed into the fuel cell 1 by the hydrogen mass flow controller 5, the hydrogen metering ratio is set to 1.1, and the hydrogen tail is discharged from the hydrogen outlet 6.

[0022] (2) The fuel cell has a current density of 0 and a constant current density of 50 mA.cm -2 Loading is carried out in gradient steps, and the running time of each current density is 2min, until the current density reaches 200mA.cm -2 .

[0023] (3) The water generated during the operation of the battery makes the proton exchange membrane in a wet s...

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Abstract

The invention relates to a method for starting and operating a fuel cell of a hydrogen-air proton exchange membrane under a non-humidifying condition. Under the dry gas intake condition of the fuel cell, a fuel and oxidant counter-flow gas intake mode is adopted to set the current loading mode, loading time and gas intake flow of the fuel cell; the fuel cell operates for a period of time under lowcurrent density; during operating of the fuel cell, water generated at the cathode side of the fuel cell enables the cathode side of the proton exchange membrane to be in a wetting state; furthermore, part of liquid water is inversely diffused to the anode side from the cathode side under the action of water concentration gradients of two sides of the membrane, so that the anode side of the membrane is also in the wetting state, and the problem of dehydration of the membrane in a dry gas state is avoided; and after the fuel cell operates stably under the low current density, the starting of the fuel cell is completed, and then, the current density is gradually loaded to the working current density, thereby keeping the stable operation of the fuel cell.

Description

technical field [0001] The invention relates to the technical field of hydrogen-air proton exchange membrane fuel cells, and more specifically relates to a start-up and operation method of a fuel cell without humidification condition that can be realized. Background technique [0002] A proton exchange membrane fuel cell is a power generation device that directly converts chemical energy stored in fuel (such as hydrogen) and oxidant (such as oxygen) into electrical energy through an electrochemical reaction. It has high efficiency, environmental friendliness, and fast response. , wide power range, modular power generation unit, etc., suitable for use as a mobile power source, electric vehicles, etc. [0003] The core component of PEMFC is the membrane electrode (MEA). The function of the membrane in the MEA is to conduct protons and block the anode and cathode gases. Since the membrane conducts protons requires the participation of water, the method of pre-humidification of...

Claims

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Application Information

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IPC IPC(8): H01M8/04302H01M8/04089H01M8/04119
CPCH01M8/04089H01M8/04126H01M8/04298Y02E60/50
Inventor 郑利民侯明艾军邵志刚赵洪林
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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