Electrochemical impedance and ultraviolet visible absorption spectrum combined analysis device and method

Abstract

The invention discloses an electrochemical impedance and ultraviolet visible absorption spectrum combined analysis device and method. According to a measuring device, a conventional electrochemical workstation and an ultraviolet visible absorption spectrometer are connected through a signal collection / analysis instrument, intermediate products or adsorbates produced on the surfaces of electrodes in a complicated solid liquid interphase reaction are determined through simultaneous measurement research of electrochemical impedance and ultraviolet visible absorption spectrum impedance of the working electrodes in an electrochemical three-electrode system in a frequency domain, and evidence is provided for effectiveness of the intermediate products introduced in an electrochemical equivalent circuit. As for a complicated electrochemical reaction, a good support function is provided for conductive high-molecular polymer doping, metal corrosion and protection and reaction mechanism and reaction process research of an electrode solid liquid interphase, and the device and the method have a wide application prospect.

Description

technical field [0001] The invention relates to an electrochemical impedance and ultraviolet-visible absorption spectrum impedance combined analysis device and method that can be applied to research fields such as conductive polymer doping reaction, metal corrosion and protection, electrode solid-liquid interface adsorption and the like. Through simultaneous electrochemical impedance measurement and ultraviolet-visible absorption spectral impedance measurement research on the working electrode in the electrochemical three-electrode system in the frequency domain, it is confirmed that the intermediate products or adsorbates produced on the electrode surface in the complex solid-liquid interface reaction, and the electrochemical equivalent circuit Provide evidence for the effectiveness of the intermediates introduced in . Background technique [0002] Electrochemical impedance spectroscopy is to apply a small-amplitude AC voltage signal with different frequencies to the electr...

AI Technical Summary

Problems solved by technology

[0002] Electrochemical impedance spectroscopy is to apply a small-amplitude AC voltage signal with different frequencies to the electrochemical system to be studied, and measure the ratio of the AC voltage change with frequency to the current signal, or the change of the impedance phase angle Φ with frequency ω, Furthermore, the kinetics of the electrode process, electric double layer and diffusion can be analyzed, and the reaction process and mechanism of electrode materials, solid electrolytes, conductive polymers, and corrosion protection can be studied, but this technology cannot identify the intermediate products formed on the electrode surface during the reaction process ( adsorption, desorption)

Images