SU815785A1 - Discrete integrator working electrode - Google Patents

Description

(54) WORKING ELECTRODE DISCRETE INTEGRATOR

I

The invention relates to instrumentation, in particular, to electrochemical integrators of discrete action, and can be used in the construction of time setting devices.

Working electrodes of discrete integrators are known, having an inert conductive substrate, on which a working layer is made of some homogeneous electroactive substance 1.

The H-most closest to the technical essence and the achieved effect to the proposed is a working electrode of a discrete integrator, having an inert conductive substrate, on which a working layer is made of electroactive substance. Gold is used as the substrate material, the working layer is made of silver 2.

The disadvantage of devices is the limited functions performed. The known working electrodes contain only one type of electroactive substance in the working layer and therefore for re-use it is necessary to re-charge the electrode (deposited on

inert substrate of the new corresponding mass of electroactive substances).

The need for alternation of workflow and electrode charging process makes it impossible to obtain a continuous sequence of two or more time delays using known 5 technical solutions.

The purpose of the invention is to extend the functionality by obtaining continuously two consecutive 0 or more time delays.

This goal is achieved by the fact that the working layer of the proposed working electrode additionally contains at least one electroactive substance, with the electroactive substances arranged in layers in order to decrease the potentials of their dissolution.

Fia FIG. 1 shows the structure of the proposed electrode: FIG. 2 - time diagram of his work.

- The core of the electrode is a metal rod 1, on the surface of which an inert conductive layer 2 of chisel is applied. The working layer is made of .1c. electr) active gkmstsstp: silver - inner sublayer 3 and lead - outer layer 4-, diameter of the thickened part of the electrode 5 mm, silver weight 0.2 g, lead 0.2 g. The working layer may additionally contain several electroactive substances, such as copper, lead and cadmium, arranged in the order of decreasing potentials of their dissolution. The potentials of the two adjacent layers must differ by at least 0.3 B.

The electrolyte used is an aqueous solution of perchloric acid, lead and silver perchlorate, taken in a ratio (g / l) of 70:40:30, respectively.

The operation of the electrode is illustrated by a time diagram (Fig. 2), showing the dependence of the potential of the electrode on time at a constant reading current.

The reading process starts at the moment tr About switching on the reading current. The horizontal section of the I diagram refers to the process of dissolution of the first electroactive substance, lead, by the reaction of Pb -

At the moment of complete dissolution of lead, the potential of the electrode abruptly changes to 0.7 V, which is caused by the process of charging the capacity of the electrical double layer on the surface of silver. The time of occurrence of this jump determines the first delay produced by the discrete integrator.

When the electrode reaches a potential of 0.7 V, the process of dissolution of the second active layer, (section P) containing silver, starts

Aa °

the duration of which determines the value of the second delay time of the discrete integrator.

With a read current of 0.1 amps, the delay time (the dissolution time of lead and silver, taken in an amount of 0.2 g each) is 31.04 minutes and 29.80 minutes, respectively.

Claims (2)

1. US Patent No. 3,538,396, cl. 317-230, pub. .3.11.70. 2. US Patent number 3423648, cl. 317-231, publication-21.01.69 (prototype). FIG. 0.5 1 Lgt at 20 ABOUT to 4 € with smg /// at LJ to 50 60