SU1718093A1 - Method of measuring working electrode potential in an electrochemical system - Google Patents

Abstract

The invention relates to electrochemistry and can be used in electronics, chymotronics, electrochemical industries, as well as in scientific research. The aim of the invention is to expand the range of measured potentials, increase the efficiency and accuracy of potential measurements. This goal is achieved by the fact that the working electrode of the electrochemical cell is connected to an autonomous electric circuit 1 or 4 tab.

Description

The invention relates to electrochemistry and can be used in electronics, chymotronics, electrochemical industries, as well as in scientific research.

Methods are known for changing the potential of an electrode by varying the current density on it.

A disadvantage of the known methods is that the predetermined potential of the electrode is provided with a certain value of the current density, which limits the performance of the electrolyzer, limits the limits of the measured potentials, and shifts the measurement accuracy, since the regulation of the current density is achieved by varying the total load on the electrolyzer.

The purpose of the invention is to expand the range of measured potentials, increase the efficiency and accuracy of potential measurements.

The goal is achieved by including the electrode of an electrochemical system into an autonomous electric circuit (AEC) as a conductor.

The essence of the invention lies in the fact that, unlike the known method, the potential of the electrode does not change due to a change in the load on the electrolyzer, but by changing the current in the AEC and the direction of the current in the conductor electrode.

The drawing shows a device for implementing the method.

The device contains an electrolyzer 1, which includes the diaphragm 2, the electrode 3 under investigation, the auxiliary electrode 4, the DC source 5, the rheostat 6, the ammeter 7. the power supply 8 of the autonomous electric circuit, the alternating resistance 9, the ammeter 10, contacts 11- 14, electrolytic key 15. Comparative electrode 16, measuring element 17.

Example. The method was tested in the electrolyzer 1 (Fig. 1) with a capacity of 20 ml in a solution containing 70 g / l of manganese and 150 g / l of ammonium chloride at pH 6.5. Diaphragm 2 served as a compacted perchlorovinyl tissue. The surface of the investigated copper electrode 3 was 0.5x0.5 cm2, the surface of the platinum auxiliary W

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th electrode 4-1,5x2 cm2. The power supply of the electrolyzer was carried out by a source of 5 pbs of current, the current was controlled by a rheostat b and monitored by an ammeter 7. Electrode 3 under study was switched on as a conductor in an AEC with an independent power source 8, the current in which was controlled by a rheostat with a variable resistance 9 and controlled by an ammeter 10. The operation of the investigated elechtrode 3 as a cathode or anode in the electrochemical system was regulated by contacts 11 and 12, and the direction of the current in the conductor electrode 3 in the AEC was the contact Ams 13 and 14. The potentials were measured by an electrolytic key 15 by the compensation method relative to the silver-chloride electrode 16 on a potentiometer of the type P 304-17. The readings were recalculated according to the hydrogen scale.

Table 1 shows the results of the dependence of the potential of the cathode on the current intensity of the AEC and the direction; Table 2 shows the dependences of the anode potential on the current strength in the AEC and

rule; Table 3 shows the results of the dependence of the current density at the cathode at its constant potential on the current strength in the AEC; Table 4 shows the change in the cathode potential as a function of the current strength in the AEC and the direction at a constant anode potential.

From the materials presented in the tables, it can be seen that by inserting the electrode into an autonomous electric circuit, by changing the current strength in it and the direction, the range of measured potentials is expanded, the efficiency and accuracy of measurements are increased.

Claims (1)

The invention The method of changing the potential of the working electrode in an electrochemical system, including the effect of electric current on the working electrode, characterized in that, in order to expand the range of potential measurement, improve efficiency and measurement accuracy, the working electrode is incorporated into an autonomous electric circuit containing a power source and variable resistance. Table 1 table 2 12 S and P Table 3 Table 4