Electrolytic cell with four-electrode system and applied to scanning electrochemical microscopes

Abstract

The invention discloses an electrolytic cell with a four-electrode system and applied to scanning electrochemical microscopes. The electrolytic cell comprises a cell body and an upper cover, and the upper cover is provided with two through holes; the upper-half parts and the lower-half parts at two sides of the cell body are respectively connected with two groups of capillaries, and each group of capillaries comprises two oppositely-arranged half-U-shaped capillaries; and the upper openings of all half-U-shaped capillaries are at a same horizontal height, and the ends of two half-U-shaped capillaries at one side go deep to the cell body and are provided with two face-to-face end openings. The electrolytic cell is capable of overcoming influences caused by electrode polarization and environment fluctuation and effectively eliminating contact impedance and line impedance, avoiding the problem that a subsequently-injected liquid is polluted when liquid-liquid interface research is performed, and enabling the formed liquid-liquid interface to be relatively clear and flat. The electrolytic cell is applicable to research on a liquid-liquid interface with an aqueous solution at the upper layer and also is applicable to research on a liquid-liquid interface with an aqueous solution at the lower layer. An upper-layer liquid is not damaged when a reference electrode and a counter electrode are inserted, so that the electrolytic cell is relatively widely applicable to liquid-liquid interface research systems.

Description

technical field [0001] The invention belongs to an electrochemical experiment auxiliary device, in particular to an electrolytic cell used for a four-electrode system of a scanning electrochemical microscope. Background technique [0002] At present, when using scanning electrochemical microscopy to study electrochemical problems such as interfacial charge transfer kinetics, sample surface imaging, and enzymatic reactions, the electrolytic cell that comes with the CHI900 electrochemical workstation is generally used. The pool has the following deficiencies or disadvantages: [0003] (1) The experiment cannot be carried out under the protection of inert gas. [0004] (2) During the experiment, the influence of electrode polarization and environmental fluctuations cannot be overcome. When measuring the liquid / liquid interface, the contact impedance and line impedance cannot be effectively eliminated. [0005] (3) During the experiment, it is difficult to add the solution. I...

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Problems solved by technology

[0003] (1) The experiment cannot be carried out under the protection of inert gas

[0004] (2) During the experiment, the influence of electrode polarization and environmental fluctuations cannot be overcome

When measuring the liquid / liquid interface, the contact impedance and line impedance cannot be effectively eliminated

[0005] (3) During the experiment, it is difficult to add the solution. In the experiment, two solutions are added successively from the tiny nozzle of the ordinary miniature beaker. The solution added first is easy to splash on the wall of the tube. The formation of the liquid interface will affect the flatness and clarity of the formed liquid / liquid interface, and the lower solution adhered to the tube wall will cause the contamination of the upper solution and eventually lead to errors or errors in the experimental measurement results

[0006] (4) The experiment cannot be carried out when measuring a special system

When the upper layer of the liquid / liquid interface is an aqueous solution and the lower layer is other solutions, the experiment can be carried out using a miniature beaker, because the reference electrode and the counter electrode can be directly put into the upper layer aqueous solution, and the working electrode is inserted into the liquid / liquid interface for experimental determination, but Determination of a special system - when the lower layer of the liquid / liquid interface is an aqueous solution and the upper layer is other solutions, the reference electrode and the counter electrode cannot be directly placed in the lower layer of the aqueous solution for the measurement of the experiment without destroying the liquid / liquid interface, resulting in the failure of the experiment conduct

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