Testing method and appliance for horizontal conductivity of fuel cell proton exchange membrane

A proton exchange membrane, fuel cell technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc.

Inactive Publication Date: 2005-01-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, what is measured by this method is still the longitudinal conductivity of the proton exchange membrane

Method used

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  • Testing method and appliance for horizontal conductivity of fuel cell proton exchange membrane
  • Testing method and appliance for horizontal conductivity of fuel cell proton exchange membrane
  • Testing method and appliance for horizontal conductivity of fuel cell proton exchange membrane

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Embodiment Construction

[0015] The conductivity change of the proton exchange membrane (nafion117) after pretreatment was tested by hot pressure test. The hot pressing temperature is 120° C., the time is 3 minutes, and the pressure is 0.4 MPa. The electrolytic cell solution is 0.5mol / LH 2 SO 4 +1mol / L methanol (simulating working conditions of direct methanol fuel cell). Test equipment such as figure 1 As shown, carbon rods were used for the working and auxiliary electrodes, and saturated calomel electrodes were used for the two reference electrodes. The conductivity is measured by the AC impedance method, the scanning frequency is from 20kHZ to 0.1HZ, and the voltage disturbance amplitude is 10mv. image 3 In order to measure the transverse conductivity of the nafion film before hot pressing, the image 3 The resistance of the blank solution can be obtained as 6.1986Ω, and the total resistance of the proton exchange membrane and the solution before the hot pressing of the nafion membrane is mea...

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Abstract

Four electrodes or three electrodes system are adopted in the invention. Carbon electrode is in sue for working electrode and auxiliary electrode for loading test current, and saturated calomel electrode is in use for reference electrode for testing response voltage. In testing, exchange membrane is placed in middle of connection hole corresponding to two electrolytic cells. Transverse resistance is measured by using AC impedence method. Conductivity of membrane is calculated out from thickness of membrane and area of the connection hole. The invented method prevents polarization issue occurred in DC test method is applicable to testing transverse conductivity of diaphragms used in other fuel cells and lithium ion cells.

Description

technical field [0001] The invention belongs to the detection of fuel cell electrolyte performance, in particular to the measurement of the conductivity of a proton exchange membrane [0002] Methods and devices. Background technique [0003] Proton exchange membrane fuel cell PEMFC uses proton exchange membrane PEM as electrolyte, its performance directly affects the battery performance, energy efficiency and service life of PEMFC, and the proton conductivity of proton exchange membrane is an important indicator to measure the performance of PEM. [0004] The development of proton exchange membrane conductivity measurement technology can be roughly divided into three generations. The first generation of measurement technology appeared in the 1960s and was recorded by Fadley C S, Wallace R A. Electropolymer studies (II). Electrical conductivity of a polystyrene sulfonic acid membrane [J]. J ElectrochemSoc, 1968, 115: 1264. At that time, Wallace and his collaborators tested...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 王新东王博张红飞陈玲
Owner UNIV OF SCI & TECH BEIJING
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