JP7761998B2 - Electrochemical Reaction Cell - Google Patents

Description

The present invention relates to an electrochemical reaction cell.

An electrochemical reaction cell has been disclosed in which a reduction reaction electrode and an oxidation reaction electrode are placed facing each other at a distance within a container, and an electrolyte solution is passed between the reduction reaction electrode and the oxidation reaction electrode, causing a chemical reaction of a substance (reaction substrate) contained in the electrolyte solution (Patent Document 1).

Patent Document 2 discloses a configuration in which an electrolyte flows from an inlet to an outlet between a reduction reaction electrode and an oxidation reaction electrode, and fins are provided to limit the flow of the electrolyte.

Japanese Patent Application Laid-Open No. 2018-087074 Japanese Patent Application Laid-Open No. 2019-189929

However, in conventional configurations with fins, the fins cover part of the reaction surface of the reduction reaction electrode and the oxidation reaction electrode, reducing the area of the region that can contribute to the reaction at each electrode. For example, in the configuration described in Patent Document 2, if the flow path width is 10 mm and the fin width is 6 mm, the area covered by the fins is 37.5% of the reaction area of the reduction reaction electrode and the oxidation reaction electrode, significantly reducing the reaction area and resulting in a significant decrease in reaction efficiency.

One aspect of the present invention is an electrochemical reaction cell comprising: a plurality of spacers that define the distance between a reduction reaction electrode and an oxidation reaction electrode that are arranged opposite each other; supports that are provided between the spacers; and a plurality of rectifier plates that are supported by the supports to maintain a distance from each other and that regulate the flow of electrolyte that flows between the reduction reaction electrode and the oxidation reaction electrode.

Here, it is preferable that the height of the current plate along the stacking direction of the reduction reaction electrode and the oxidation reaction electrode is smaller than the height of the spacer, and that the reaction surfaces of the reduction reaction electrode and the oxidation reaction electrode are spaced apart from the current plate.

It is also preferable that a separator be attached to the support to separate the reduction reaction electrode and the oxidation reaction electrode.

Furthermore, it is preferable that the area of each of the reduction reaction electrode and the oxidation reaction electrode covered by the current plate be 10% or less. It is even more preferable that the area of each of the reduction reaction electrode and the oxidation reaction electrode covered by the current plate be 5% or less.

It is also preferable that the support pillars be corrosion-resistant and insulating against the electrolyte.

The present invention provides an electrochemical reaction cell that can more uniformly supply the liquid used in the reaction without reducing the reaction area.

1 is a perspective view showing a configuration of an electrochemical reaction cell according to an embodiment of the present invention. 1 is a cross-sectional view schematically illustrating a configuration of an electrochemical reaction cell according to an embodiment of the present invention. 1 is a cross-sectional view schematically illustrating a configuration of an electrochemical reaction cell according to an embodiment of the present invention. 3 is a plan (surface) view from the Y direction showing the configuration of a current plate and a separator in the embodiment of the present invention. FIG. 4 is a plan view (rear view) seen from the Y direction showing the configuration of a current plate and a separator in the embodiment of the present invention. FIG. FIG. 2 is a cross-sectional view showing the configuration of a current plate and a separator according to the embodiment of the present invention. FIG. 10 is a diagram showing the results of analyzing the flow of fluid in a configuration in which no flow straightening plate is provided. 10A and 10B are diagrams illustrating the results of analyzing the flow of a fluid in an embodiment of the present invention. FIG. 4 is a diagram showing the distribution of fluid flow velocity in an embodiment of the present invention.

As shown in the perspective view of Figure 1 and the cross-sectional views of Figures 2 and 3, the electrochemical reaction cell 100 in this embodiment of the present invention comprises an oxidation reaction electrode 102, a reduction reaction electrode 104, a separator 106, an electrolyte 108, a container 110, an orifice plate 112, and a rectifier plate 114.

Figure 2 shows a cross-sectional view of the electrochemical reaction cell 100 cut along the Y-Z plane when the electrolyte 108 is not being supplied. Figure 3 shows a cross-sectional view of the electrochemical reaction cell 100 cut along the Y-Z plane when the electrolyte 108 is being supplied.

The oxidation reaction electrode 102 and the reduction reaction electrode 104 are plate-shaped components extending in the X and Z directions, respectively, and are arranged facing each other along the Y direction. In this embodiment, the oxidation reaction electrode 102 and the reduction reaction electrode 104 are arranged with the separator 106 sandwiched between them, with their respective catalyst-supported reaction surfaces extending in the X-Z plane facing each other.

In addition, in this embodiment, from the left side of Figures 2 and 3, the oxidation reaction electrode 102, separator 106, and reduction reaction electrode 104 are arranged along the Y direction, then the reduction reaction electrode 104, separator 106, and oxidation reaction electrode 102 are arranged along the Y direction, then the oxidation reaction electrode 102, separator 106, and reduction reaction electrode 104 are arranged along the Y direction, then the reduction reaction electrode 104, separator 106, and oxidation reaction electrode 102 are arranged along the Y direction, and then the oxidation reaction electrode 102, separator 106, and reduction reaction electrode 104 are arranged along the Y direction. In other words, multiple electrode sets each consisting of the oxidation reaction electrode 102, separator 106, and reduction reaction electrode 104 are stacked along the Y direction.

The reduction reaction electrode 104 is an electrode used to reduce a substance through a reduction reaction. The reduction reaction electrode 104 has a structure in which a conductive layer and a reduction catalyst layer are laminated on a substrate. The substrate is a member that structurally supports the reduction reaction electrode 104 and may include, for example, an insulator such as a glass substrate, a metal including titanium (Ti), silver (Ag), gold (Au), etc., or a semiconductor including titanium oxide (TiO ₂ ), tin oxide (SnO ₂ ), silicon (Si), etc. When the substrate is an insulator, a conductive layer is provided between the substrate and the reduction catalyst layer. The conductive layer is provided to apply a voltage to the reduction catalyst layer of the reduction reaction electrode 104. The conductive layer is not particularly limited, but is preferably a transparent conductive layer such as indium tin oxide (ITO), fluorine-doped tin oxide (FTO), or zinc oxide (ZnO). The reduction catalyst layer is composed of a material having reduction catalytic function. The reduction catalyst layer preferably contains a complex catalyst. The reduction catalyst layer is preferably a ruthenium complex, for example. Examples of the complex catalyst include [Ru{4,4'-di(1-H-1-pyrrolypropyl carbonate)-2,2'-bipyridine}(CO)(MeCN)Cl ₂ ], [Ru{4,4'-di(1-H-1-pyrrolypropyl carbonate)-2,2'-bipyridine}(CO) ₂ Cl ₂ ], [Ru{4,4'-di(1-H-1-pyrrolypropyl carbonate)-2,2'-bipyridine}(CO) ₂ ] _n , [Ru{4,4'-di(1-H-1-pyrrolypropyl carbonate)-2,2'-bipyridine}(CO)(CH ₃ CN)Cl ₂ ], and the like.

Modification with a complex catalyst can be achieved by applying a solution of the complex dissolved in acetonitrile (MeCN) to the conductive layer. Modification with a complex catalyst can also be achieved by electropolymerization. Using a conductive layer electrode as the working electrode, a glass substrate coated with fluorine-containing tin oxide (FTO) as the counter electrode, and an Ag/Ag ⁺ electrode as the reference electrode, the surface of the conductive layer can be modified with the complex catalyst by passing a cathodic current in an electrolyte solution containing the complex catalyst so that the potential is negative relative to the Ag/Ag ⁺ electrode, and then passing an anodic current so that the potential is positive relative to the Ag/Ag ⁺ electrode. Acetonitrile (MeCN) can be used as the electrolyte solution, and tetrabutylammonium perchlorate (TBAP) can be used as the electrolyte.

The reduction catalyst layer can also be composed of a material containing a carbon material (C). The size of the single unit of the carbon material structure is preferably 1 nm or more and 1 μm or less. The carbon material preferably contains at least one of carbon nanotubes, graphene, and graphite. Graphene and graphite are preferably sized to be 1 nm or more and 1 μm or less. Carbon nanotubes are preferably sized to be 1 nm or more and 40 nm or less. The conductor can be formed by spraying a carbon material mixed with a liquid such as ethanol and then heating it. Spin coating may also be used instead of spraying. Alternatively, the solution may be directly dripped and dried before application without using spin coating.

The oxidation reaction electrode 102 is an electrode used to oxidize a substance through an oxidation reaction. The oxidation reaction electrode 102 is formed on a substrate. The oxidation reaction electrode 102 is composed of a conductive layer and an oxidation catalyst layer. The substrate is a member that structurally supports the oxidation reaction electrode 102 and can be made of, for example, the same material as the substrate used for the reduction reaction electrode 104. When the substrate is an insulator, a conductive layer is provided between the substrate and the oxidation catalyst layer. The conductive layer is provided to apply a voltage to the oxidation catalyst layer of the oxidation reaction electrode 102. The conductive layer is preferably made of indium tin oxide (ITO), fluorine-doped tin oxide (FTO), zinc oxide (ZnO), or the like. The oxidation catalyst layer is composed of a material that has oxidation catalytic function. The material that has oxidation catalytic function can be, for example, a material containing iridium oxide (IrOx).

Iridium oxide can be supported on the surface of a conductive layer as a nanocolloid solution. For example, nanocolloids of iridium oxide (IrOx) are synthesized. Next, a yellow solution is prepared by adding 10 wt% aqueous sodium hydroxide (NaOH) to 50 ml of a 2 mM aqueous solution of potassium chloroiridate (IV) (K ₂ IrCl ₆ ) to adjust the pH to 13. The resulting solution is heated at 90°C for 20 minutes using a hot stirrer. The resulting blue solution is cooled in ice water for 1 hour. 3M nitric acid (HNO ₃ ) is then added dropwise to the cooled solution (20 ml) to adjust the pH to 1, and the mixture is stirred for 80 minutes to obtain an aqueous nanocolloid solution of iridium oxide (IrOx). Furthermore, 1-2 ml of a 1.5 wt% aqueous NaOH solution is added dropwise to this solution to adjust the pH to 12. The nanocolloidal aqueous solution of iridium oxide (IrOx) obtained in this manner is applied to the conductive layer at a pH of 12 and dried in a drying oven at 60°C for 40 minutes. After drying, the precipitated salt is washed with ultrapure water to form the oxidation reaction electrode 102. The application and drying of the nanocolloidal aqueous solution of iridium oxide (IrOx) may be repeated multiple times.

The electrochemical reaction cell 100 can be configured such that adjacent pairs of oxidation reaction electrodes 102 are bonded together at their backsides along the stacking direction (Y direction), and the backsides of the reduction reaction electrodes 104 are bonded together, with the oxidation reaction electrodes 102, reduction reaction electrodes 104, reduction reaction electrodes 104, oxidation reaction electrodes 102, etc. stacked and housed in a single container 110. Alternatively, an oxidation catalyst layer can be formed on both sides of the substrate of adjacent pairs of oxidation reaction electrodes 102, and a reduction catalyst layer can be formed on both sides of the substrate of the reduction reaction electrode 104, with the oxidation reaction electrodes 102, reduction reaction electrodes 104, reduction reaction electrodes 104, oxidation reaction electrodes 102, etc. stacked and housed in a single container 110.

The electrochemical reaction cell 100 functions by introducing an electrolyte 108 between the reduction reaction electrode 104 and the oxidation reaction electrode 102. That is, as shown in Figure 3, a container 110 is placed to surround the reduction reaction electrode 104 and the oxidation reaction electrode 102, and the electrolyte 108, in which the reactants are dissolved, is supplied to the surfaces of the reduction reaction electrode 104 and the oxidation reaction electrode 102.

The reactant may be a carbon compound, such as carbon dioxide (CO ₂ ). The electrolyte 108 is preferably a phosphate buffer solution or a borate buffer solution. In a specific configuration example, a tank of carbon dioxide (CO ₂ )-saturated phosphate buffer solution is provided, and the solution is supplied by a pump from an electrolyte solution supply port to the surfaces of the reduction reaction electrode 104 and the oxidation reaction electrode 102. Liquid products such as formic acid (HCOOH) produced by the reduction reaction are discharged together with the electrolyte solution 108 from the electrolyte solution outlet 110b, and are collected in an external fuel tank. Gas products such as carbon monoxide (CO) produced by the reduction reaction are discharged from the gas exhaust port 110c, and are collected in an external fuel tank.

In this embodiment, the oxidation reaction electrode 102 and the reduction reaction electrode 104 are arranged in the container 110 so that the reaction surface on which the catalyst is supported is oriented vertically (in the X-Z plane). Furthermore, in this embodiment, multiple sets 120 of the oxidation reaction electrode 102 and the reduction reaction electrode 104 are stacked along the Y direction.

It is also preferable to electrically connect the reduction reaction electrode 104 and the oxidation reaction electrode 102 and apply an appropriate bias voltage. The means for applying the bias voltage is not particularly limited, and examples include a chemical battery (including a primary battery, a secondary battery, etc.), a constant voltage source, and a solar cell. In this case, the positive electrode is connected to the oxidation reaction electrode 102, and the negative electrode is connected to the reduction reaction electrode 104. The connection between the oxidation reaction electrode 102 and the reduction reaction electrode 104 may be set as appropriate. For example, some of the oxidation reaction electrode 102 and the reduction reaction electrode 104 may be connected in series, parallel, or series-parallel. Furthermore, a switch for switching the connection may be provided to change the connection configuration of the oxidation reaction electrode 102 and the reduction reaction electrode 104 to the bias power supply.

When a solar cell is used as the bias power supply, the solar cell can be placed adjacent to the oxidation reaction electrode 102 and the reduction reaction electrode 104. For example, a solar cell can be placed behind the reduction reaction electrode 104, with the positive electrode of the solar cell connected to the oxidation reaction electrode 102 and the negative electrode connected to the reduction reaction electrode 104. When a solar cell is used as the bias power supply, using a single set of the oxidation reaction electrode 102 and the reduction reaction electrode 104 may result in the solar cell being used at an operating point where its efficiency is poor. On the other hand, connecting multiple sets of the oxidation reaction electrode 102 and the reduction reaction electrode 104 in parallel makes it possible to use the solar cell at an operating point where its efficiency is high.

When synthesizing formic acid (HCOOH) from carbon dioxide (CO ₂ ), water (H ₂ O) is oxidized to supply electrons and protons to carbon dioxide (CO ₂ ). At a pH of around 7, the oxidation potential of water (H ₂ O) is 0.82 V and the reduction potential is -0.41 V (both NHE). Furthermore, the reduction potentials of carbon dioxide (CO ₂ ) to carbon monoxide (CO), formic acid (HCOOH), and methyl alcohol (CH ₃ OH) are -0.53 V, -0.61 V, and -0.38 V, respectively. Therefore, the potential difference between the oxidation potential and the reduction potential is 1.20 to 1.43 V.

The container 110 is a component that supports the oxidation reaction electrode 102, the reduction reaction electrode 104, the separator 106, the current plate 114, etc., and also forms a flow path through which the electrolyte 108 flows. The container 110 is made of a material that has the mechanical strength necessary to configure the electrochemical reaction cell 100 as a cell. For example, the container 110 can be made of metal, plastic, etc.

The container 110 is provided with an electrolyte supply port 110a for supplying the electrolyte solution 108 into the container 110. It is also provided with an electrolyte outlet 110b for discharging the electrolyte solution 108 from the container 110. That is, the electrolyte solution 108 containing the substance to be reacted is supplied into the container 110 from the electrolyte supply port 110a, and the electrolyte solution 108 is allowed to flow through the reaction region between the oxidation reaction electrode 102 and the reduction reaction electrode 104. The electrolyte solution 108 is then discharged from the container 110 through the electrolyte outlet 110b.

The container 110 is also provided with a gas exhaust port 110c that allows gas generated by the reaction in the electrochemical reaction cell 100 to be discharged from the container 110. It is preferable to position the gas exhaust port 110c vertically above the reaction region in which the oxidation reaction electrode 102 and the reduction reaction electrode 104 are located in the container 110.

The electrochemical reaction cell 100 is further provided with an orifice plate 112. The orifice plate 112 is a component provided with orifice holes 112a and 112b, which are through-holes that restrict the flow of the electrolyte 108 introduced into the container 110 from the electrolyte supply port 110a. The orifice plate 112 is positioned in the flow path in the container 110 that extends from the electrolyte supply port 110a to the area where the oxidation reaction electrode 102 and the reduction reaction electrode 104 are provided. The orifice plate 112 is made of a material that has the necessary mechanical strength. For example, the orifice plate 112 can be made of metal, plastic, etc.

Figures 4 to 6 show the configuration of the current plate 114 and separator 106 used in the electrochemical reaction cell 100. Figures 4 and 5 show the configuration of the front and back surfaces of the oxidation reaction electrode 102 and the reduction reaction electrode 104 in the electrochemical reaction cell 100 as viewed from the stacking direction (Y direction). Figure 6 is an enlarged view as viewed from the flow direction (Z direction) of the electrolyte 108.

The rectifying plate 114 is mechanically supported by a frame formed by combining spacers 10 and support posts 12.

The spacers 10 are rod-shaped members arranged in the direction of flow of the electrolyte 108 (Z direction). While the material of the spacers 10 is not particularly limited, it is preferable to use an electrically insulating material that is resistant to corrosion and damage by the electrolyte 108. The spacers 10 are arranged on both sides of the frame. The spacers 10 are used as members that mechanically support the current plate 114 and separator 106, and can also be used as members that define the gap between the oxidation reaction electrode 102 and the reduction reaction electrode 104, which are arranged opposite each other. For example, if the gap between the oxidation reaction electrode 102 and the reduction reaction electrode 104 is desired to be 10 mm, it is preferable to set the height h1 of the spacers 10 to 10 mm. It is also preferable to set the width t1 of the spacers 10 to, for example, 10 mm.

The pillars 12 are components that, together with the spacers 10, form the frame. The pillars 12 are arranged in a direction that intersects the flow direction (Z direction) of the electrolyte 108, and connect the spacers 10 arranged on both sides of the frame. The pillars 12 maintain a constant spacing between the spacers 10. In addition, the rectifying plates 114 are fixed to the pillars 12. Therefore, the pillars 12 maintain a constant spacing between the rectifying plates 114. There are no particular limitations on the number of pillars 12, but it is preferable to use a number that allows the spacing between the spacers 10 and the rectifying plates 114 to be kept as uniform as possible.

The material that makes up the support 12 is preferably one that is resistant to corrosion and damage caused by the electrolyte 108 and has electrical insulation properties. For example, the support 12 is preferably made of a metal rod covered with a resin heat-shrink tube.

The rectifying plate 114 is a member that restricts the flow of the electrolyte 108 in the electrochemical reaction cell 100. The material that constitutes the rectifying plate 114 is not particularly limited, but it is preferable that it be made of a material that is resistant to corrosion and damage by the electrolyte 108 and has electrical insulation properties. The rectifying plate 114 is a plate-shaped member that extends along the direction in which the electrolyte 108 flows (Z direction).

The height of the rectifying plate 114 in the stacking direction (Y direction) of the oxidation reaction electrode 102 and the reduction reaction electrode 104 and the width in the in-plane direction (X direction) of the oxidation reaction electrode 102 and the reduction reaction electrode 104 may be set appropriately. However, the height h2 of the rectifying plate 114 in the stacking direction (Y direction) of the oxidation reaction electrode 102 and the reduction reaction electrode 104 should be equal to or less than the height h1 of the spacer 10, and preferably less than the height h1. For example, if the height h1 of the spacer 10 is 10 mm, the height h2 of the rectifying plate 114 should preferably be 8 mm.

By making the height h2 of the rectifying plate 114 less than the height h1 of the spacer 10, when the spacer 10 is sandwiched between the oxidation reaction electrode 102 and the reduction reaction electrode 104 and the gap between the oxidation reaction electrode 102 and the reduction reaction electrode 104 is adjusted to height h1, a gap can be created between the rectifying plate 114 and the surfaces of the oxidation reaction electrode 102 and the reduction reaction electrode 104. As described below, this allows the rectifying plate 114 to uniformly distribute the flow of the electrolyte 108, and eliminates areas of the surfaces of the oxidation reaction electrode 102 and the reduction reaction electrode 104 that are covered by the rectifying plate 114, thereby improving the utilization efficiency of the oxidation reaction electrode 102 and the reduction reaction electrode 104.

In addition, in the electrochemical reaction cell 100, the spacers 10 and the support columns 12 form a frame that supports the current plates 114. The support columns 12 maintain a uniform gap between the current plates 114, allowing the width t2 of the current plates 114 to be reduced. For example, the width t2 of the current plates 114 in the X direction can be set to 2 mm. If 18 current plates 114 with a width t2 of 2 mm are arranged for a 1 m square oxidation reaction electrode 102 and a reduction reaction electrode 104, the area covered by the current plates 114 relative to the reaction area of the oxidation reaction electrode 102 and the reduction reaction electrode 104 can be reduced to 4.0%. This increases the reaction area compared to conventional configurations, thereby improving the reaction efficiency of the electrochemical reaction cell 100. In this way, the area covered by the current plates 114 in the electrochemical reaction cell 100 can be reduced to 10% or less, and even 5% or less.

The separator 106 is a member that separates the oxidation reaction electrode 102 and the reduction reaction electrode 104. The separator 106 can be made of a proton-conducting film, which is a porous material that can transmit protons in the electrolyte 108. The separator 106 can be made of, for example, at least one of rayon nonwoven fabric, vinylon nonwoven fabric, hydrophilized ultra-high molecular weight polyethylene porous film, hydrophilized polypropylene mesh, and hydrophilized ultra-high molecular weight polyethylene porous film. Note that if the separator 106 is not required, the separator 106 may be omitted.

In the electrochemical reaction cell 100, rectangular, flat separators 106 can be arranged facing the surfaces of the oxidation reaction electrode 102 and the reduction reaction electrode 104 in each region partitioned by current plates 114 extending along the flow direction (Z direction) of the electrolyte 108. Each separator 106 can be fixed by, for example, attaching it to a support 12.

Figures 7 and 8 show the results of fluid analysis of the flow of the electrolyte 108 when the height h1 of the spacer 10 was set to 10 mm, the oxidation reaction electrode 102 and the reduction reaction electrode 104 were spaced 10 mm apart and arranged facing each other in the Y direction, and the electrolyte 108 was allowed to flow from bottom to top in the Z direction. Figure 7 shows the results of fluid analysis for a configuration in which the current plate 114 was not provided. Figure 8 shows the results of fluid analysis for a configuration in which the current plate 114 was extended along the Z direction and the height h2 of the current plate 114 was set to 8 mm. In both cases, the flow was analyzed when a fluid (water) was flowing at 32 L/min.

As shown in Figure 7, in a configuration without a straightening plate 114, turbulence occurred in the flow direction at the bottom of the flow path. In addition, there were areas where the flow velocity of the fluid was significantly reduced. On the other hand, as shown in Figure 8, in a configuration with a straightening plate 114, the fluid flowed along the straightening plate 114, and the flow was regulated from the bottom to the top of the flow path.

9 shows the results of determining the flow velocity at 10 evaluation points along a line (line A in FIGS. 7 and 8) cutting the flow path from bottom to top in the X direction. In the configuration without the straightening vane 114, the standard deviation of the flow velocity was 9.35×10 ⁻⁴ , while in the configuration with the straightening vane 114, the standard deviation of the flow velocity was 7.00×10 ⁻⁴ . Thus, in the configuration with the straightening vane 114, the distribution of the fluid flow velocity in the X direction was more uniform than in the configuration without the straightening vane 114.

10 Spacer, 12 Support, 100 Electrochemical reaction cell, 102 Oxidation reaction electrode, 104 Reduction reaction electrode, 106 Separator, 108 Electrolyte, 110 Container, 110a Electrolyte supply port, 110b Electrolyte discharge port, 110c Gas discharge port, 112 (112a, 112b) Orifice plate, 114 Rectifier plate.

Claims (7)

a plurality of spacers that are sandwiched between a plate-shaped reduction reaction electrode and a plate-shaped oxidation reaction electrode that are disposed opposite to each other and that define a distance between the reduction reaction electrode and the oxidation reaction electrode ;
a support pillar provided between the spacers;
a plurality of rectifying plates supported by the support pillars at intervals from one another and regulating the flow of the electrolyte flowing between the reduction reaction electrode and the oxidation reaction electrode;
Equipped with
an electrochemical reaction cell, characterized in that the rectifying plate extends along a direction from a supply side to a discharge side of the electrolytic solution in a flow path of the electrolytic solution between the reduction reaction electrode and the oxidation reaction electrode, and is not provided along a direction intersecting the direction . 2. The electrochemical reaction cell according to claim 1,
an electrochemical reaction cell characterized in that the height of the current rectifier plate along the stacking direction of the reduction reaction electrode and the oxidation reaction electrode is smaller than the height of the spacer, and the reaction surfaces of the reduction reaction electrode and the oxidation reaction electrode are separated from the current rectifier plate over the entirety of the current rectifier plate . 3. The electrochemical reaction cell according to claim 1 or 2,
An electrochemical reaction cell, characterized in that a separator is attached to the support to separate the reduction reaction electrode and the oxidation reaction electrode. 2. The electrochemical reaction cell according to claim 1,
an electrochemical reaction cell, characterized in that the thickness of the support pillar along the stacking direction of the reduction reaction electrode and the oxidation reaction electrode is smaller than the thickness of the current plate along the stacking direction. 2. The electrochemical reaction cell according to claim 1 ,
An electrochemical reaction cell, characterized in that the area of each of the reduction reaction electrode and the oxidation reaction electrode covered by the current plate is 10% or less. 6. The electrochemical reaction cell according to claim 5 ,
An electrochemical reaction cell, characterized in that the area of each of the reduction reaction electrode and the oxidation reaction electrode covered by the current plate is 5% or less. The electrochemical reaction cell according to any one of claims 1 to 6 ,
The electrochemical reaction cell is characterized in that the support pillars are corrosion-resistant and insulating against the electrolyte.