JPS61207589A - Electrode for water electrolyzer for high temperature and high pressure - Google Patents

Abstract

PURPOSE:To provide the titled electrode which has a low overvoltage and has good current efficiency by arranging many electrode made of metallic plates into diagonal, parallel and diamond-shapes at specified intervals to vertical electrodes made of metallic wires to a horizontal row in tight contact therewith. CONSTITUTION:The electrodes 1 made of the metallic wires sized at about 15-20 mesh are installed on both sides of a diaphragm 3 in tight contact therewith. Several sheets - several tens sheets of the metallic plate electrodes 2 made to a suitable rectangular shape having about 0.5-1.0mm thickness are arrayed and mounted to such electrodes 1 in the diagonal, parallel and diamond shapes in tight contact therewith at the specified suitable intervals into the horizontal row. Metallic fittings 4 are further mounted to the outside thereof, by which the electrode for a water electrolyzer for high-temp. and high pressure is obtd. Such electrode is charged into the electrolyte in the electrolyzer and DC current is impressed thereon. Oxygen is then generated on the anode and hydrogen on the cathode, respectively. The bubbles thereof rise in the spaces of the electrodes 2 in the direction opposite from the diaphragm 3 and are emitted to the outside. The water is thus electrolyzed with high electrolytic efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing hydrogen and oxygen in an electrolytic cell for high-temperature, high-pressure water when DC power is turned on.

Conventional water electrolyzers have metal plates arranged in parallel electrodes in a vertical row with a diaphragm in between, and when the current density is increased, the terminals and poles,
Voltage drop increases due to resistance between plates, diaphragms, electrolyte, etc. and bubbles generated, and overvoltage at both electrodes, especially bubbles at the hydrogen electrode, increases rapidly, requiring extra voltage, reducing power efficiency.

According to the present invention, even if the voltage is increased (overvoltage), the effectiveness of the current (current efficiency) is improved and power efficiency can be achieved satisfactorily.

Embodiments of this invention will be described with reference to the drawings.
The vertical metal mesh electrode (1) shown in the figure is a mesh of 15 to 20 meshes, which is closely attached to the mesh at a certain appropriate interval in horizontal rows, and has a rectangular shape suitable for diagonal, parallel, armor-shaped shapes, and a thickness of 0. 5
Several or tens of metal plate electrodes (2) of ax~1,0 are arranged and equipped.

This metal plate electrode (2) is in close contact with the metal mesh electrode (1) to constitute the entire electrode (1) (2), and the diaphragm (3)
) Attach the metal mounting bracket (4) to the opposite side.

The entire electrodes (1) and (2) are arranged relatively to each other on both sides with the diaphragm (3) in between, and are installed in the electrolytic cell container, and an electrolytic solution is introduced.

Next, when connected to a DC power source, oxygen is generated at the anode and hydrogen is generated at the cathode. These bubbles rise through the gap between the diagonal, parallel, and armor-shaped metal plate electrodes (2) in the opposite direction to the diaphragm. go out.

As described above, this invention has a different shape from the conventional water electrolyzer electrodes, and has a metal mesh electrode (1) and a diaphragm (3).
Since the metal mesh electrode (1) is in contact with the diaphragm (3), the current efficiency is good in terms of resistivity between the electrodes, and the metal mesh electrode (1) protects the diaphragm (3).

The metal plate electrode (2) is diagonal, parallel, and armor-shaped, and the generated bubbles are always in the opposite direction to the direction of ion conduction, so the electrode surface is constantly cleaned and the voltage drop does not increase, so ion conduction is prevented. It also runs well.

Note that the metal mesh electrode (1) and the metal plate electrode (2) are joined to each other, so that the unit area becomes very large and the current density can be made very large.

As described above, the present invention is an electrode that has the feature of being able to increase the current by a small amount while increasing the voltage by a small amount. Also, a water electrolyzer equipped with this electrode has high productivity.

[Brief explanation of drawings]

The figure shows an embodiment of the water electrolyzer electrode of the present invention. Figure 1 is a side view of the entire electrode, which is equipped with electrodes on both sides of the water electrolyzer with the diaphragm in between. FIG. 2 is a front view of one side of this electrode with the diaphragm removed. FIG. 6 is a one-sided front view of a part of the diaphragm, then a part of the metal mesh electrode, then a part of the metal plate electrode, and the mounting bracket from the top. 1-Metal mesh electrode 2-Metal plate electrode 3-Diaphragm 4-
mounting bracket

Claims (1)

[Claims] An electrode for a water electrolyzer, which is made up of a large number of metal plate electrodes (2) arranged in diagonal, parallel, or armor-like shapes in close contact with a vertical metal mesh electrode (1) at regular intervals in horizontal rows.