Device for measuring surface resistance of ion exchange membrane through AC (alternating current) method

Abstract

The invention relates to a device for measuring surface resistance of an ion exchange membrane through an AC method. The device comprises: a testing conductance cell (I), a temperature controlled water bath (II), and an LCR (inductance, capacitance, resistance) tester (III). Placed in the temperature controlled water bath (II), the testing conductance cell (I) consists of: a fixed principal arm (8) and an auxiliary arm (3) rotatably disposed on the principal arm (8). The lower ends of the two arms are provided with two half chambers (5) that can be buckled through the rotary auxiliary arm (3), and the two half chambers (5) are buckled to clamp an ion exchange membrane (10). The bottoms of the two half chambers (5) are equipped with platinum sheet electrodes (6), where two electrode leads are led out through lead seal grooves (4) on the two arms respectively. And the two electrode leads are connected to the LCR tester through Kelvin clamp lead wires. Able to simply and rapidly test thesurface resistance of an ion exchange membrane, the device of the invention is non-invasive in measuring membrane surface resistance, and is conducive to improve test precision and reduce errors caused by membrane nonuniformity.

Description

technical field [0001] The invention relates to the field of testing the surface resistance of an ion-exchange membrane, in particular to a device for measuring the surface resistance of an ion-exchange membrane by an alternating current method. Background technique [0002] The surface resistance of the ion-exchange membrane is an important indicator to measure the electrochemical performance of the membrane. Usually, the smaller the surface resistance value of the membrane, the faster the migration speed of ions in the membrane, and the stronger the conductivity of the ion-exchange membrane. The surface resistance of the ion exchange membrane mainly depends on the concentration of active ionic groups in the membrane. Generally speaking, the larger the exchange capacity of the membrane and the higher the water content, the smaller the surface resistance of the membrane. Among them, the properties of ion-exchange groups (degree of dissociation), membrane structure character...

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Problems solved by technology

These three methods all have shortcomings, such as the measurement error of the differential method in dilute solution is large; the structure of the test device of the differential-differential method is too complicated; the mercury contact method uses metallic mercury, which will damage the ion exchange membrane during measurement. Moreover, strict requirements for membrane pretreatment

Because these test devices not only have large differences in structure, but also use different test solution systems and test conditions, so the measured results are quite different and the comparability is poor.

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