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Method for accurately testing fuel cell anode overpotential caused by hydrogen impurities and application thereof

A fuel cell and overpotential technology, applied in fuel cells, measuring current/voltage, measuring electrical variables, etc., can solve the problems of inaccurate determination of anode overpotential and difficult polarization, and achieve the effect of simple and easy test method

Pending Publication Date: 2021-11-09
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the polarization caused by the oxygen reduction reaction at the cathode accounts for a large proportion of the entire electrochemical polarization of the battery, it is difficult to distinguish the polarization caused by the hydrogen oxidation reaction at the anode, and it is impossible to accurately determine the anode overheating caused by impurity gas poisoning. electric potential

Method used

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  • Method for accurately testing fuel cell anode overpotential caused by hydrogen impurities and application thereof
  • Method for accurately testing fuel cell anode overpotential caused by hydrogen impurities and application thereof
  • Method for accurately testing fuel cell anode overpotential caused by hydrogen impurities and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Make the active area 25 cm 2 The membrane electrode was assembled into the single cell fixture and connected to the test instrument. After checking the airtightness of the fixture, the working temperature was set at 75 °C, and pure hydrogen was fed to the anode. The yield was 95%, the cathode was not ventilated, and the gas pressure for atmospheric pressure. After the temperature rises to 75 ℃, the constant current operation is stable ( figure 1 ), the voltage stabilized at about 26 mV.

Embodiment 2

[0025] The operating conditions are the same as in Example 1, except that the pure hydrogen fed into the anode side in step (1) is mixed with 5 ppm CO. Constant current running display ( figure 2 ), the overpotential rises by about 270 mV after the impurities are poisoned.

Embodiment 3

[0027] The operating conditions are the same as in Example 1, except that the pure hydrogen fed into the anode side in step (1) is mixed with 3 ppm CO, and the temperature is 65 °C. Constant current running display ( image 3 ), after the impurities are poisoned, the overpotential rises by about 250 mV.

[0028] It can be seen that the overpotential generated when the impurities on the anode side pass through the electrochemical hydrogen pump can effectively avoid the polarization effect caused by the redox reaction of the cathode in the fuel cell.

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Abstract

The invention provides a method for accurately testing fuel cell anode overpotential caused by hydrogen impurities and application thereof,. A hydrogen pump principle is utilized, that is, an anode is subjected to a hydrogen oxidation reaction, a cathode is subjected to a hydrogen evolution reaction, impurity gas with a certain concentration is mixed into hydrogen on the anode side, a polarization curve during operation is tested by adopting a constant current method, thus, fuel cell anode overpotential caused by hydrogen impurities is determined. The method is simple and easy to implement, and the fuel cell anode overpotential caused by hydrogen impurities can be accurately tested, so that basic data can be provided for optimizing and perfecting the hydrogen quality standard for the vehicle fuel cell in China.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a method for accurately testing the anode overpotential of a fuel cell caused by hydrogen impurities and an application thereof, in particular to a method for testing the anode overpotential of a fuel cell caused by anode impurities by using a hydrogen pump principle. Background technique [0002] Currently, the durability of proton exchange membrane fuel cells (PEMFCs) is one of the key factors restricting the commercial application of hydrogen energy in the transportation field. Sufficient studies and verifications have been carried out on the durability of fuel cells at home and abroad. The results show that the hydrogen quality of vehicle fuel cells, especially the trace impurities in hydrogen (such as H 2 S, CO, NH 3 , CO 2 , formaldehyde, formic acid and light hydrocarbon components, etc.) is one of the key factors leading to the degradation of fuel cell performance. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04537G01R19/165
CPCH01M8/04552G01R19/16542Y02E60/50
Inventor 窦美玲崔博览柯绍杰王峰
Owner BEIJING UNIV OF CHEM TECH
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