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Online detection method of carbon corrosion in membrane electrode

A detection method and membrane electrode technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of large influence, large error, high price, etc., and achieve the effect of high accuracy, good repeatability, and intuitive test method.

Inactive Publication Date: 2012-11-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0009] At present, there are mainly two methods for testing the corrosion of carbon supports. One is the indirect method, that is, the loss rate of the activity specific surface of the catalyst is used to reverse the corrosion rate of the carbon support. This method is greatly affected by the environment and instruments, and the error The other method is the direct method, which uses infrared spectroscopy to detect the generated COx. Although this method is intuitive, it is also greatly affected by the air and the price is relatively expensive.

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  • Online detection method of carbon corrosion in membrane electrode
  • Online detection method of carbon corrosion in membrane electrode
  • Online detection method of carbon corrosion in membrane electrode

Examples

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Embodiment 1

[0025] The tail gas of the anode outlet of the fuel cell in normal operation is passed into the three-way solenoid valve, one port of the three-way valve is connected with the tail gas of the cathode outlet, the second port is connected with the atmosphere, and the third port is connected with the gas inlet reformer After the exhaust gas at the cathode outlet is diverted by the three-way valve, the exhaust gas can be collected at any time; the exhaust gas can realize CO x The methanation of X = 1 or 2; the temperature of the reformer is 300°C, and the catalyst for the reformer is 5% to 30% Ru-Al 2 o 3 , the converted gas flowing out from the gas outlet of the gas reformer enters the gas chromatograph through the six-way valve automatic sampling device for detection, and the gas chromatograph adopts a carbon molecular sieve chromatographic column. By mixing with standard gas (CO or CO 2 ) chromatographic peak area comparison, calculate the amount of gas produced by carbon car...

Embodiment 2

[0038] Assemble a freshly pressed MEA into a single-cell test device, and inject hydrogen and oxygen on both sides of the device to make the fuel cell operate normally; battery conditions: outlet backup pressure 28psig, battery temperature 75°C, dew point humidification temperature 70°C, Reaction gas pipeline temperature 85°C, St-H 2 : 1.5, St-Air: 2.5. Start-Stop test procedure: Start: 1min, Stop: 1min, and so on.

[0039] The tail gas on the hydrogen side is connected to the plane three-way valve to realize the collection of tail gas at any time; then the collected tail gas is passed into the gas reformer, the temperature of the reformer is 350°C, and the catalyst for the reformer is Ni-Al 2 o 3 Realize CO x -CH x Transformation; the transformed gas is connected to a six-way valve automatic sampling device, and enters a gas chromatograph for detection. The gas chromatograph uses a carbon molecular sieve chromatographic column. By comparing with the standard gas, calcula...

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Abstract

The invention discloses an online detection method of carbon corrosion condition in proton exchange membrane fuel cell membrane electrode (MEA). The method tests the carbon corrosion condition of MEA in actual running process using Cox reformer and gad detection equipment. Tail gas of anode outlet or tail gas of cathode outlet of a fuel cell in normal running is fed into the Cox reformer through a gas controller; the tail gas converted by the reformer is fed into the gas detection equipment to obtain the condition of carbon corrosion. The test method comprises a tail gas controller, a gas reformer, catalyst, a temperature controller, a sampling system, the gas detection equipment and a gas pipeline. Through the detection method, the concentration of carbon corrosion product in MEA can be automatically detected on line, and the corrosion condition of carbon accurately can be reflected in time; and furthermore, the detection method is featured by simple test process, easy control and good repeatability.

Description

technical field [0001] The invention relates to a method for detecting gas generated by carbon corrosion during the operation of a proton exchange membrane fuel cell, in particular to a method for on-line detection of carbon corrosion in a membrane electrode. Background technique [0002] A fuel cell is an energy conversion device that can directly convert chemical energy into electrical energy. Compared with other energy storage batteries, as long as the fuel cell can continuously provide reactive substances, the fuel cell can continue to operate, and its energy efficiency can reach 60% to 80% (the heat engine is generally about 30%). The actual use efficiency is twice that of ordinary internal combustion engines. [0003] The proton exchange membrane fuel cell has the characteristics of rapid start-up at room temperature, no loss of electrolyte, no discharge of pollutants, high specific power and specific energy, and is expected to replace the current commonly used The e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
Inventor 王美日张华民钟和香邱艳玲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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