JPH10245688A - Electrolytic cell for hydrogen oxygen generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent protrusion of the gasket of an electrolytic cell and nonuniform surface pressure thereof and thereby, to prevent damage of parts and leakage of generated gases. SOLUTION: An annular protective plate 3a of the size to protrude from the outer periphery of a disk-shaped mesh-like porous power feeder 3 of a porous power feeder unit 13 is stuck to the surface on the solid electrolytic membrane side of the porous power feeder 3 along its outer peripheral edge. The annular gasket 14 delineating an anode chamber and cathode chamber, respectively, is fitted to the outer peripheral side of the porous power feeder 3. The part where the gasket overlaps on the protective plate 3a is joined to the protective plate 3a, by which the surface on the solid electrolytic membrane side of the gasket 14 and the surface on the solid electrolytic membrane side of the protective plate 3a are made substantially flush with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic cell for a hydrogen oxygen generator (hereinafter simply referred to as an electrolytic cell), a gasket thereof, and a porous power supply unit. More specifically, an electrolytic cell for a hydrogen / oxygen generator for obtaining high-purity hydrogen gas and oxygen gas by electrolyzing water, a gasket used for the electrolytic cell, and a porous power supply used for the electrolytic cell Body unit.

[0002]

2. Description of the Related Art As shown in FIG. 6, a high-pressure type high-purity hydrogen / oxygen generator (hereinafter, simply referred to as HHOG) 51 includes a pure water electrolysis cell (hereinafter, simply referred to as electrolysis cell) 52 containing hydrogen. oxygen generation tank (hereinafter, simply pure as water tank) 53 is removed and the pure water supply tank 54 for supplying pure water W in the pure water tank 53, the liquid fraction from the hydrogen gas H ₂ (pure water) Gas-liquid separation tank 5 for hydrogen gas
5 are the main constituent devices. Reference numeral 56 denotes a pure water supply pump. The electrolytic cell 52 has a cylindrical shape.

In the electrolytic cell 52 in the pure water tank 53, pure water is electrolyzed inside the electrolytic cell 52, and hydrogen gas H ₂ and oxygen gas O ₂ are generated. The generated oxygen gas O ₂ is directly passed through the pure water in the pure water tank 53, sent to a dehumidifier (not shown) through the oxygen gas outlet pipe 57, and collected after dehumidification. On the other hand, the hydrogen gas H ₂ generated is not passed through the deionized water in the deionized water tank 53 is guided from the electrolytic cell 52 to the first hydrogen gas takeout tube 58a hydrogen gas liquid separation tank 55 through, where removal of the liquid component Then, it is sent to a dehumidifier (not shown) through the second hydrogen gas extraction pipe 58b and collected after dehumidification. In addition, 5
9 is a cooler for suppressing a rise in the temperature of the pure water W in the pure water tank 53.

[0004] The electrolytic cell 52 is formed by arranging a predetermined set of solid electrolyte membrane units, and has a cylindrical shape. The solid electrolyte membrane unit has electrode plates on both sides of the solid electrolyte membrane, one of the spaces enclosed by them is an anode chamber and the other is a cathode chamber, and the surroundings are surrounded by a member such as a gasket. A power supply is provided in the room.

[0005] The structure of the electrolytic cell 52 is shown in FIGS. 7 and 8. FIG. 7 shows the electrolytic cell before assembly, and FIG. 8 shows a main part of the electrolytic cell after assembly. In the figure, 61 is a disk-shaped electrode plate, 62 is a disk-shaped solid electrolyte membrane, 62
“a” is a platinum plating layer provided on both surfaces of the solid electrolyte membrane 62. Reference numeral 63 denotes a disk-shaped porous power feeder, and 63a denotes a ring-shaped protection plate concentrically affixed to the surface of the porous power feeder 63 on the solid electrolyte membrane 62 side.
The outer diameter is made larger than 3. Reference numeral 64 denotes an annular gasket, and reference numeral 65 denotes an annular protective sheet. And 66
Is a hydrogen gas takeout port, 66a is a hydrogen gas takeout path, 67 is an oxygen gas takeout port, and 67a is an oxygen gas takeout path. 68a and 68b are end plates. Although the pure water supply path is not shown in this drawing, it is formed by the same configuration as the hydrogen gas extraction port 66.

[0006] The electrolytic cell 52 is obtained by fastening the above components with bolts 69 shown in FIG. 7 so as to be sandwiched between both end plates 68a and 68b. When a DC voltage is applied between the electrode plates at both ends of the electrolytic cell 52, the end electrode plates at both ends become an anode and a cathode, respectively, and the intermediate electrode plate is a bipolar electrode plate having one surface as an anode and multiple surfaces as a cathode. Become. Generally, the gasket 64 is made of silicone rubber. The porous power supply body 63 is formed of a mesh-like titanium, and can be dented and conformed even when a partial pressure is applied, and a gap is formed inside the mesh-like portion in which a fluid can freely flow. Have been. The protection plate 63a is generally formed of a titanium plate having a thickness of about 0.05 to 0.5 mm. When the electrolytic cell 52 is assembled by fastening the bolt 69, the protective plate 63 a is used for the porous power supply 63.
Is provided to prevent the solid electrolyte membrane 62 from being damaged by the outer peripheral corners.

When assembling the above conventional electrolytic cell 52, the end plates 68a,
Gasket 64, electrode plate 61, gasket 64, porous feeder 63, protective sheet 65, solid electrolyte membrane 62,...
The components are stacked in that order after a guide member (not shown) is provided on the outer peripheral side. Then, after placing the end plate 68b at the uppermost stage (right end in the figure), the bolt 6
At 9, all parts are clamped.

The electrolytic cell 52 shown in FIG.
(The central axis of the electrolytic cell is substantially horizontal), but there are also vertical ones.

[0009]

The solid electrolyte membrane 62 operates from a water content of about 30%, and has a low mechanical strength in a wet state during operation. Therefore, in the HHOG 51 configured as described above, as shown in FIG.
When the electrolytic cell 52 is assembled, the outer peripheral corner 63b of the protection plate 63a presses the solid electrolyte membrane 62 by fastening the bolt 69, and the solid electrolyte membrane 62 may be damaged. Although the protection sheet 65 is interposed,
This protective sheet 65 has a thickness of 25 to 100 as described above.
It is only about μm, and is cut by the outer peripheral corner 63b of the protection plate 63a, so that a large effect of preventing damage cannot be achieved. If the thickness of the protective sheet 65 is increased, there is a problem that contact between the solid electrolyte membrane 62 and the porous power supply body 63 is deteriorated. Since the porous power supply body 63 is easily recessed at the inner peripheral side corner of the protection plate 63a as described above, the solid electrolyte membrane 62 is not damaged.

Further, since the protection plate partially overlaps the gasket surface, the surface pressure of the gasket becomes uneven.

The present invention has been made to solve such a problem, and a fitting step portion in which the protection plate can be fitted on the surface of the gasket such that the gasket and the protection plate are substantially flush with each other. It is an object of the present invention to provide an electrolytic cell and a gasket for preventing the corner portion from being pressed against the solid electrolyte membrane 62 by forming the same.

[0012]

The electrolytic cell according to the first aspect of the present invention is an electrolytic cell having an anode chamber and a cathode chamber separated by a solid electrolyte membrane between positive and negative electrode plates, A porous power feeder is disposed in each of the anode chamber and the cathode chamber, and annular gaskets respectively defining an anode chamber and a cathode chamber are fitted around an outer periphery of the porous power feeder. Along with the outer peripheral edge of the surface on the solid electrolyte membrane side, an annular protection plate for protecting the solid electrolyte membrane is attached so as to overlap over the entire circumference on the inner peripheral side of the annular gasket, and on the surface of the annular gasket. An annular gasket and an annular protection plate are fitted with each other to form a fitting step portion which can be substantially coplanar with the annular protection plate.

With such a configuration, the electrolytic cell of the present invention is
The outer peripheral edge of the annular protective plate does not protrude toward the solid electrolyte membrane. That is, since there is no step on the surface on the solid electrolyte membrane side, the outer peripheral edge of the annular protective plate does not damage the solid electrolyte membrane when the electrolytic cell is assembled by fastening bolts or the like. Further, there is no non-uniform surface pressure applied to the gasket unlike the prior art.

Further, the gasket of the present invention is an annular gasket disposed on the outer periphery of a porous power supply constituting the anode chamber and the cathode chamber of the electrolytic cell, respectively, for defining the anode chamber and the cathode chamber, respectively. A step is formed on one surface to reduce the thickness of the inner peripheral side, and the step is provided on the one surface along the outer peripheral edge of the porous feeder for protecting the solid electrolyte membrane. The outer peripheral side of the annular protective plate is fitted, and the porous feeder is fitted on the inner peripheral side of the gasket, so that the annular power supply plate and the annular protective plate can be substantially coplanar. And

With such a configuration, the gasket of the present invention has the same operational effects as the electrolytic cell of the present invention when incorporated in the electrolytic cell.

An electrolytic cell according to a second aspect of the present invention is an electrolytic cell having an anode compartment and a cathode compartment separated by a solid electrolyte membrane between both positive and negative electrode plates, wherein the anode compartment and the cathode compartment are provided. Each is provided with a porous feeder, and has an annular protection having a size such that the entire circumference of the porous feeder protrudes from the outer periphery of the porous feeder to the surface on the solid electrolyte membrane side along the outer peripheral edge of the porous feeder. An annular gasket that defines an anode chamber and a cathode chamber is fitted on the outer peripheral side of the porous power supply body, and the annular gasket and the annular protection plate overlap with each other. The solid electrolyte membrane side surfaces of the protection plate and the annular gasket are joined so as to be substantially flush with each other.

With this configuration, also in the electrolytic cell of the present invention, the outer peripheral edge of the annular protective plate does not protrude toward the solid electrolyte membrane, and the outer peripheral edge of the annular protective plate does not damage the solid electrolyte membrane.

Further, since the annular gasket and the porous feeder are joined and integrated via the annular protective plate, the annular gasket and the porous feeder are not particularly eccentric during assembly. As a result, the annular gasket does not protrude outside the electrolytic cell and the surface pressure applied to the annular gasket does not become non-uniform, so that there is no risk of damage to components and leakage of generated gas.

The protection plate is formed thin,
Since the inner diameter side is joined to the porous power supply body and the outer diameter side is joined to the gasket, the rigidity is preferably improved.

The porous power supply unit according to the present invention is a porous power supply unit constituting an anode chamber and a cathode chamber of an electrolytic cell, and the solid electrolyte is provided along the outer peripheral edge of the mesh-shaped porous power supply. An annular protection plate having a size such that the entire circumference protrudes from the outer periphery of the porous power supply body is attached to the membrane-side surface, and an annular chamber that defines an anode chamber and a cathode chamber on the outer circumference side of the porous power supply body, respectively. The gasket is fitted, the annular gasket and the annular protection plate overlap each other, and the annular protection plate and the annular gasket are joined so that their surfaces on the solid electrolyte membrane side are substantially flush with each other. It is characterized by becoming.

With this configuration, the porous power supply unit of the present invention has the same function and effect as the electrolytic cell of the present invention when incorporated in the electrolytic cell.

It should be noted that the term "annular" in the claims means not only an annular (annular) shape but also a polygonal annular shape, an oblong annular shape, an elliptical annular shape and the like. In short, it may be set according to the shape of the electrolytic cell.

Also, the annular protective plate having a size such that the entire circumference protrudes from the outer circumference of the porous power supply means a substantial outer circumference of a portion where the size of the annular protection plate faces the solid electrolyte membrane of the porous power supply. Means that it protrudes from the entire circumference.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The electrolytic cell, gasket and porous power supply unit of the present invention will be described below with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a sectional view showing a main part of a solid electrolyte membrane unit in an embodiment of the electrolytic cell according to the present invention before assembling. FIG. 2 is a perspective view showing one embodiment of the gasket of the present invention in FIG. FIG. 3 is a sectional view after assembly showing a main part of the solid electrolyte membrane unit of FIG. FIG.
1 is a partially cutaway perspective view showing one embodiment of a porous power supply unit of the present invention. FIG. 5 is a sectional view showing an essential part of a solid electrolyte membrane unit in another embodiment of the electrolytic cell of the present invention incorporating the porous power supply unit of FIG. 4 before assembly.

FIG. 1 and FIG. 3 show a solid electrolyte membrane unit 1 incorporated in an electrolytic cell. In the solid electrolyte membrane unit 1, reference numeral 2 denotes a disk-shaped solid electrolyte membrane, and reference numeral 2a denotes a porous platinum plating layer provided on both surfaces of the solid electrolyte membrane 2. Reference numeral 3 denotes a disk-shaped porous power supply, and reference numeral 3a denotes an annular protection plate attached along the outer periphery of the surface of the porous power supply 3 on the solid electrolyte membrane 2 side. Is provided in order to prevent the solid electrolyte membrane 2 from being damaged by the edge. Reference numeral 4 denotes an annular gasket, and reference numeral 5 denotes an annular protective sheet. Reference numeral 6 denotes a disk-shaped electrode plate.

The material of the porous feeder 3 is made of titanium, the same as that of the electrode plate 6, and a mesh having a thickness of about 0.5 to 2 mm is used. The protection plate 3a has a thickness of 0.05 to
It is formed from a titanium plate of about 0.5 mm, and is not particularly limited in a method of attaching it to the porous power supply body 3, but is attached by spot welding in the present embodiment. The inner diameter of the protection plate 3 a is smaller than the outer shape of the porous power supply 3, and the outer diameter is larger than the outer shape of the porous power supply 3.

Next, the solid electrolyte membrane 2 is formed by molding a solid polymer electrolyte into a membrane, and a noble metal on both surfaces.
In particular, it is preferable to use a solid polymer electrolyte membrane in which a porous layer made of a platinum group metal is chemically formed by electroless plating. As the solid polymer electrolyte membrane, a cation exchange membrane (a fluororesin sulfonic acid cation exchange membrane, for example, “Nafion 117” manufactured by DuPont)
Is preferred. In this case, the porous plating layer is preferably made of platinum among the platinum group metals. In particular, if the porous structure has a double structure composed of platinum and iridium, a high current density of 200 A / dm ² at 80 ° C. for four years. For a long period of time. In addition to the above-mentioned iridium, a solid electrolyte membrane having a multilayer structure in which two or more kinds of platinum group metals are plated can also be used.

Incidentally, for example, in a conventional solid electrolyte membrane having a structure in which an electrode is physically brought into contact with an ion exchange membrane, 5
The current density is about 0 to 70 A / dm ² .

Further, in the solid electrolyte membrane 2 configured as described above, since no water exists between the solid polymer electrolyte and the porous plating layer, the solution resistance and the gas resistance are small. Therefore, the contact resistance between the solid polymer electrolyte and the two porous plating layers decreases, the voltage drop decreases, and the current distribution becomes uniform. As a result, higher current density,
High-temperature water electrolysis and high-pressure water electrolysis can be performed, and high-purity oxygen gas and hydrogen gas can be efficiently obtained.

It is also possible to use other solid electrolyte membranes such as a ceramic membrane in addition to the solid polymer electrolyte membrane.

Reference numeral 7 denotes a hydrogen gas take-out path, and reference numeral 8 denotes an oxygen gas take-out path. Although the pure water supply path is not shown in this drawing, it is formed by the same configuration as the gas extraction paths 7 and 8.

The other structure is the same as that of the above-mentioned prior art (FIGS. 7 and 8).

The protective sheet 5 has a thickness of 25 to 100 μm.
m from the solid electrolyte membrane 2 which is made strongly acidic during operation.
Installed to isolate and protect The protective sheet 5 has an annular shape, and has such a shape and size as to fit on the outer peripheral side of the platinum plating layer 2 a of the solid electrolyte membrane 2.

The gasket 4 has a thickness of 0.5 to 2 mm.
It is formed in a ring shape from a silicon rubber plate of a degree. The shape and dimensions are such that they fit exactly on the outer peripheral side of the porous power supply body 3. Of course, the gasket 4 and the porous power supply 3 do not have to be completely fitted (that is, tightly fitted), and may have a slight gap (for example, about 0.3 mm on one side).
(Approximately 5 mm). As is clear from FIG. 2, the inner peripheral side is thinned. That is, the step 4a is formed. The step portion 4a is shaped and fitted so that a portion of the protection plate 3a that extends outward from the outer peripheral edge of the porous power supply body 3 is fitted. That is, the inner diameter of the step 4a is substantially the same as or slightly larger than the outer shape of the protection plate 3a, and the depth of the step 4a is substantially the same as the thickness of the protection plate 3a.

The gasket 4 is connected to the protective plate 3
By assembling with the porous power feeder 3 with a, as shown in FIG. 3, the outer peripheral edge of the protection plate 3a does not protrude from the side of the solid electrolyte membrane 2 in the gasket 4, and when assembled as an electrolytic cell, The solid electrolyte membrane 2 is not damaged.

Since the porous feeder 3 and the gasket 4 have the same thickness (about 0.5 to 2 mm), the fitting step 4a for the protection plate 3a is formed on the gasket 4 as described above. Then, the porous power supply body 3 protrudes by the thickness of the protection plate 3a on the side opposite to the step portion 4a of the gasket 4.
However, there is no problem because the porous power feeder 3 is compressed and sufficiently adhered to the electrode plate 6 and the solid electrolyte membrane 2 by tightening with a bolt at the time of assembling the electrolytic cell.

The inner peripheral edge side of the protection plate 3a is a porous power feeder 3 having elasticity when the electrolytic cell is assembled.
To sink into the porous feeder 3 so that
The inner peripheral side corner does not damage the solid electrolyte membrane 2.

FIG. 4 shows a porous power supply unit 13 formed by integrally connecting the porous power supply 3 with the protection plate 3a and the gasket 14. In the porous power supply unit 13, the step portion 4a is not formed in advance as in the gasket 4 (FIGS. 1 and 2), but is integrally connected to the protection plate 3a when the gasket 14 is formed. That is, it is formed by insert molding or the like. In that case, the molding is performed so that one surface of the protection plate 3a and one surface of the gasket 14 form the same plane P (also see FIG. 5). The method of molding the gasket 14 integrally with the protection plate 3a is not limited to the insert molding. Next, the porous feeder 3 is concentrically joined to the protection plate 3a integrated with the gasket 14 by spot welding or the like, and the porous feeder 3, the protection plate 3a, and the gasket 14 are integrated. Power supply unit 13
Is completed.

When the porous power supply unit 13 is incorporated into the solid electrolyte membrane unit 1, the state is as shown in FIG. FIG. 5 shows the state before assembly. The components other than the porous power supply unit 13 have the same configuration as the solid electrolyte membrane unit 1 in FIG.

When the porous feeder unit 13 is assembled into the solid electrolyte membrane unit 1 to assemble it as an electrolysis cell, as shown in FIG. 3, the surface of the gasket 14 on the side of the solid electrolyte membrane 2 is covered with the protective plate 3a. The periphery does not protrude, and the solid electrolyte membrane 2 is not damaged when assembled as an electrolytic cell.

Further, the following advantages can be obtained by using the porous power supply unit 13 in which the three members 3, 3a, and 14 are integrated. That is, for example, the electrolytic cell is
When assembling with the left side of the bottom facing down, the solid electrolyte membrane 2
When the porous feeder unit 13 is placed on the protection sheet 5 after being stacked thereon, even if there is no guide, the outer circumference of the gasket 14 is guided and incorporated into other electrolytic cell components. By all, 3,
3a and 14 are arranged concentrically. As a result, it is possible to prevent the gasket 14 from protruding outward and causing uneven surface pressure, which causes leakage of generated gas and damage to components. Although the high pressure type HHOG has been described as an example in the above embodiment, the electrolytic cell of the present invention is not limited to the high pressure type HHOG, but may be a low pressure type (e.g., a pipe for removing generated oxygen gas from the electrolytic cell. Through which the pure water tank is omitted).

It is apparent that the present invention can be applied not only to the column-shaped electrolytic cell as in the above-described embodiments but also to a prismatic or elliptic electrolytic cell.

[0044]

According to the present invention, since the outer peripheral edge of the protective plate for protecting the solid electrolyte membrane does not protrude toward the solid electrolyte membrane, the protective plate is not assembled when the electrolytic cell is assembled by fastening bolts or the like. Does not damage the solid electrolyte membrane. Further, there is no non-uniform surface pressure applied to the gasket unlike the prior art. As a result, there is no fear of leakage or mixing of the generated gas, and, of course, the solid electrolyte membrane can have a longer life and can be reused.

According to the second aspect of the present invention, in addition to the above effects, the annular gasket and the porous power supply are joined and integrated via the annular protective plate.
There is no eccentricity between parts during assembly. As a result, the annular gasket does not move in the plane direction of the annular gasket to cause an uneven surface pressure on the gasket, nor does the deformation of the protection plate damage the solid electrolyte membrane.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a solid electrolyte membrane unit in an embodiment of an electrolytic cell according to the present invention before assembly.

FIG. 2 is a perspective view showing one embodiment of the gasket of the present invention.

FIG. 3 is a cross-sectional view showing a main part of the solid electrolyte membrane unit of FIG. 1 after assembly.

FIG. 4 is a partially cutaway perspective view showing one embodiment of a porous power supply unit of the present invention.

5 is a sectional view showing a main part of a solid electrolyte membrane unit in another embodiment of the electrolytic cell of the present invention, in which the porous power supply unit of FIG. 4 is incorporated, before assembly.

FIG. 6 is a system diagram showing an example of a conventional high-pressure hydrogen oxygen generator.

FIG. 7 is a cross-sectional view showing an example of a conventional electrolytic cell type electrolytic cell before assembly.

FIG. 8 is a cross-sectional view of a main part after assembling showing an example of a conventional electrolytic cell type electrolytic cell.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Solid electrolyte membrane unit 2 ... Solid electrolyte membrane 2a ... Platinum plating layer 3 ... Porous feeder 3a ... Protection plate 4, 14 ... Electrode plate 4a ... Step part 5 ...・ Protection sheet 6 ・ ・ ・ Electrode plate 7 ・ ・ ・ Hydrogen gas extraction path 8 ・ ・ ・ Oxygen gas extraction path 13 ・ ・ ・ Porous feeder unit

Continued on the front page (72) Inventor Teruyuki Morioka 934-4 Tsuchiyama, Hiraoka-cho, Kakogawa-shi, Hyogo

Claims (4)

[Claims] 1. An electrolytic cell having an anode chamber and a cathode chamber separated by a solid electrolyte membrane between an anode plate and a cathode plate, wherein a porous feeder is disposed in each of the anode chamber and the cathode chamber. An annular gasket defining an anode chamber and a cathode chamber is fitted around the outer periphery of the porous power supply, and along the outer peripheral edge of the surface of the porous power supply on the solid electrolyte membrane side, An annular protection plate for protecting the solid electrolyte membrane is attached so as to overlap over the entire inner circumference of the annular gasket, and the annular protection plate is fitted on the surface of the annular gasket to form the annular gasket and the annular protection. An electrolytic cell for a hydrogen oxygen generator, characterized in that a fitting step portion is formed such that the surfaces of the plates on the solid electrolyte membrane side can be substantially coplanar. 2. An annular gasket disposed on an outer periphery of a porous power supply constituting an anode chamber and a cathode chamber of an electrolytic cell, respectively, for defining an anode chamber and a cathode chamber, respectively, and one surface of the annular gasket. Is formed on the inner peripheral side, and the outer peripheral side of the annular protective plate for protecting the solid electrolyte membrane attached to one surface of the porous power supply body along the outer peripheral edge thereof is formed on the step. The annular protective plate is fitted to the inner peripheral side of the gasket so as to be substantially coplanar with the annular protective plate. gasket. 3. An electrolytic cell having an anode compartment and a cathode compartment separated by a solid electrolyte membrane between both positive and negative electrode plates, wherein a porous feeder is disposed in each of the anode compartment and the cathode compartment. An annular protective plate having a size such that the entire circumference thereof protrudes from the outer periphery of the porous power feeder is attached to the surface of the porous power feeder along the outer peripheral edge thereof on the surface facing the solid electrolyte membrane. Annular gaskets respectively defining an anode chamber and a cathode chamber are fitted on the outer peripheral side of the power feeder, the annular gasket and the annular protection plate overlap each other, and the solid electrolyte membrane of each of the annular protection plate and the annular gasket An electrolysis cell for a hydrogen oxygen generator, wherein side surfaces are joined so as to be substantially coplanar with each other. 4. A porous power supply unit constituting each of an anode chamber and a cathode chamber of an electrolytic cell, wherein the porous power supply unit is provided on a surface on a solid electrolyte membrane side along an outer peripheral edge of a mesh-shaped porous power supply. An annular protective plate having a size whose entire circumference protrudes from the outer circumference of the body is attached, and annular gaskets respectively defining an anode chamber and a cathode chamber are fitted on the outer peripheral side of the porous power supply body, An electrolytic cell, wherein the annular gasket and the annular protective plate overlap each other, and the annular protective plate and the annular gasket are joined so that their surfaces on the solid electrolyte membrane side are substantially flush with each other. For porous feeder unit.