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Measurement and analysis device applicable to electrochemical systems with different impedances

A measurement analysis and electrochemical technology, applied in the field of electrochemical impedance measurement and analysis, can solve problems such as inapplicability of the three-electrode measurement method, circuit burnout, measurement error, etc., and achieve the effects of fast calculation speed, improved work efficiency, and high measurement accuracy.

Active Publication Date: 2019-04-09
SUN YAT SEN UNIV
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Problems solved by technology

However, in the actual circuit, if the impedance of the system to be measured is small and a constant potential is applied, the current flowing through the system will be too large, which will easily exceed the actual circuit drive and load capacity, resulting in measurement errors and even circuit burnout.
It can be seen that the three-electrode measurement method of the potentiostat is not suitable for the electrochemical system with small impedance

Method used

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  • Measurement and analysis device applicable to electrochemical systems with different impedances
  • Measurement and analysis device applicable to electrochemical systems with different impedances
  • Measurement and analysis device applicable to electrochemical systems with different impedances

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Embodiment Construction

[0038] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0039] This embodiment discloses a measurement and analysis device suitable for different impedance electrochemical systems, such as figure 2 As shown, it includes: excitation signal source unit 1, current negative feedback unit 2, three-electrode measurement unit 3, three operational amplifier instrument amplification unit 4, current signal acquisition unit 5, and digital signal processing unit 6;

[0040] The output terminal of the excitation signal source unit 1 is connected to the counter electrode terminal (CE) of the three-electrode measurement unit 3 through the current negative feedback unit 2, and is used to provide the excitation signal to the three-electr...

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Abstract

The invention discloses a measurement and analysis device applicable to electrochemical systems with different impedances. An operator only needs to control a first controllable relay and a second controllable relay, so that the measurement and analysis device can be switched between two working conditions, the measurement and analysis device can be applicable to the electrochemical systems with different impedances at the same time, a thinking set that impedance measurement is performed in a working way of using a constant potential instrument only in the prior art is broken through, and working efficiency of measurement is greatly improved; meanwhile, a digital signal processing unit is used for performing impedance calculation, so that the measurement and analysis device disclosed by the invention has the characteristics of large working frequency range, high calculation speed and high measurement accuracy.

Description

technical field [0001] The invention relates to the field of electrochemical impedance measurement and analysis, in particular to a measurement and analysis device suitable for different impedance electrochemical systems. Background technique [0002] Electrochemical impedance AC measurement is to apply a small amplitude electrical signal to the system. On the one hand, it can avoid the small signal disturbance from having a large impact on the system. According to the causality condition, the system will only respond to the small signal, and when the small signal After the signal disturbance stops, the system can return to the original state; on the other hand, the relationship between the disturbance and the response of the system is approximately linear. When the change of the signal disturbance is small enough, the relationship between the system change process speed and the signal variable can be calculated as Linear approximation is performed, which simplifies the math...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01R27/02
CPCG01N27/416G01R27/02
Inventor 王自鑫陈泽宁戴宗谢曦杨柏儒邹志成钟明健
Owner SUN YAT SEN UNIV
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