SU627183A1 - Electrode for electrolysis of water - Google Patents

Description

The invention relates to the electrochemical / production, in particular, to the materials of the anodes for the electrolysis of war. The electrode of electrochemical processes, which is a nankel base with an electrocatalytic coating comprising nickel and phosphorus, is known. . A known electrode for the electrolysis of an aqueous alkali solution, which is a nickel base with an active layer in the form of a coating of cobalt-nickel-phosphorus alloys with the following ratio of components, wt.%: SOZ-7O N12O-65 p5-7 2. Disadvantages of this electrode there are high potentials and an overpotential of oxygen evolution. The aim of the invention is to reduce the potential of the electrode shaft and over-stress the evolution of oxygen containing a nickel base with an active coating of an alloy incorporating nickel into cobalt. The goal is achieved by -retf, which is the electrode of the electrochemical cells, in particular for electrolysis. water, contains a nickel layer with an active coating of an alloy comprising nickel and cobalt with the following content of components, wt.%: M- 70-85 Co15-30 The electrode is prepared as follows. A galvanic layer of a nickel-cobalt alloy with a thickness of 30 microns is applied to the nickel base, then the resulting system is heated at 4OO C for 4 hours and, after cooling, leached in 6M KOH for 8 hours. At an electrode with a cobalt content of 15–30 wt.% In an alloy at room temperature, the amount of over-tension during anoane release of oxygen causes only 280 MV at a current density of 2OOO A / m. The proposed elektrodrod also underwent long-term laboratory tests, work under load at ZOO with KON 7OO in ZO% solution with almost no increase in polarization (the overload strength increased by only 10 MV), and the time of continuous electrolyte recovery in the electrolyte 240Oh The test results of the electrode are given in Table. 1. Under comparable conditions, a reduction in the electron potential and a decrease in the overvoltage of oxygen evolution for known electrodes and heteloid electrodes are given in Table 2. 6 34 Rationale for the cobalt content in the alloy in terms of the electrode potential and the overvoltage of oxygen evolution at a current density of 9 A / DM are given in table. 3. The proposed electrode is characterized by a low potential of the electrode and the overvoltage of oxygen evolution and can be used as an anode, for example, npiu electrolysis of water or aqueous solutions of sodium chloride, and since the economic side of these industries is mainly determined by the power consumption, reducing the overpotential of oxygen evolution and, consequently, reducing the voltage on the electrolytic bath will provide significant savings. Table 1

60

1.40

ZOO

Activated

Potential, V (RHE)

Cobalt alloying, wt.%

1.62

1.52

1.47

1.40

TOO

2400

Table 2 Table 3 Value of bidding

0.34 0.23 O, 18

1.44 0.15

Claims (2)

1.54 0.25 5 62 Formula of the Invention Electrode OLYA Electrolysis Electrode, containing a nickel base with an active layer deposited on it in a Vice Nickel-Cobalt alloy, is also distinguished by the fact that, in order to reduce the potential of the electro and overvoltage oxygen, alloy components are taken in the following ratio, wt.%: 36 N cell 70-85 Cobalt 15-30. Sources of information taken into account in the examination: 1- Application No. 2163328 / 26,25.07,75, according to which a decision was made to issue an author's certificate, 2. USSR author's certificate No. 537125, cl. From 25 to 11/06, 25.O4.74.