JP2019189929A - Electrochemical reaction cell and artificial photosynthesis cell using the same - Google Patents

Abstract

To provide an electrochemical reaction cell with suppressed stagnation of an electrolytic solution even when the cell is upsized, and an artificial photosynthesis cell using the same.SOLUTION: An electrochemical reaction cell for electrochemically reacting a chemical material contained in an electrolytic solution 106 by opposing an electrode 104 for reduction reaction to an electrode 102 for oxidation reaction by separating the electrodes and circulating the electrolytic solution 106 between the electrode 104 for reduction reaction and the electrode 102 for oxidation reaction, comprises: an introduction port for introducing the electrolytic solution 106 between the electrode 104 for reduction reaction and the electrode 102 for oxidation reaction; and an exhaust port 20 for exhausting the chemical material generated from between the electrode 104 for reduction reaction and the electrode 102 for oxidation reaction by electrochemical reaction together with the electrolytic solution 106. A connection region 26 leading to the exhaust port 20 in a passage of the electrolytic solution 106 includes an inclined part in which an inclination angle θ is 3° or greater.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electrochemical reaction cell and an artificial photosynthesis cell using the same.

Using solar energy, water (H ₂ O) to hydrogen (H ₂ ), water (H ₂ O) and carbon dioxide (CO ₂ ) to carbon monoxide (CO), formic acid (HCOOH), methanol (CH ₃ OH) ) And the like are disclosed. In order to realize artificial photosynthesis, it is necessary to apply a potential difference of 2 to 3 V between the oxidation reaction electrode and the reduction reaction electrode. In order to realize this, photoelectrodes in which an oxidation / reduction catalyst is supported on both surfaces of an amorphous silicon-based three-junction solar cell (a-Si 3J-SC) are used (Non-Patent Documents 1 and 2). In addition, an amorphous silicon-based three-junction solar cell is used, and a reduction catalyst is supported on the back surface (opposite the light incident surface) to form a reduction reaction electrode, and includes a member having an oxidation catalyst function so as to face this In other words, an artificial photosynthesis cell in which a solar cell and an electrochemical cell are integrated, in which an oxidation reaction electrode is arranged and connected to the surface electrode of the solar cell, is used (Non-patent Document 3). In addition, there is an example in which a counter-type cell is configured using a III-V compound two-junction solar cell (III-V 2J-SC) aiming at higher efficiency (Non-Patent Document 4).

S.Y.Reece, et al., Science 334, 645 (2011) T.Arai, et al., Energy Environ. Sci. 8, 1998 (2015) J.-P. Becker, et al., J. Mater. Chem. A5, 4818 (2017) G. Peharz, et al., Int. J. Hydrogen Energy 32, 3248 (2007)

  By the way, in the electrochemical reaction cell, if the flow of the electrolyte supplied between the reduction reaction electrode and the oxidation reaction electrode is delayed, the efficiency of the chemical reaction is lowered. For example, if the gas generated in the electrochemical reaction cell accumulates in the flow path of the electrolyte, the flow of the electrolyte may stagnate and the efficiency of the chemical reaction may be reduced. In particular, when the cell size is increased, it is necessary to adopt a configuration that takes into account the flow of the electrolyte.

  In one aspect of the present invention, the reduction reaction electrode and the oxidation reaction electrode are spaced apart from each other, and an electrolytic solution is circulated between the reduction reaction electrode and the oxidation reaction electrode. An electrochemical reaction cell for electrochemically reacting a chemical substance contained in the liquid, the inlet for introducing the electrolytic solution between the reduction reaction electrode and the oxidation reaction electrode, and the reduction reaction A discharge port for discharging a chemical substance generated by an electrochemical reaction together with the electrolytic solution from between an electrode and the oxidation reaction electrode, and from an end of the reduction reaction electrode and the oxidation reaction electrode An electrochemical reaction cell comprising an inclined portion having an inclination angle of 3 ° or more in a connection region connected to the discharge port.

  Here, a plurality of introductions for supplying the electrolytic solution between the reduction reaction electrode and the oxidation reaction electrode, which are arranged in a path from the introduction port to the reduction reaction electrode and the oxidation reaction electrode. A manifold having a hole, and a flow rate of the electrolyte flowing out from the introduction hole provided farthest from the introduction port is a flow rate of the electrolyte solution flowing out from the introduction hole provided closest to the introduction port. It is preferable that the relationship between the pipe diameter of the manifold and the diameter of the introduction hole is set to be 90% or more.

  In addition, it is preferable that a fin is provided between the reduction reaction electrode and the oxidation reaction electrode to limit a flow direction of the electrolyte solution from the introduction port toward the discharge port.

  Moreover, it is suitable to set it as the artificial photosynthesis cell characterized by including the solar cell module which produces | generates the electric power supplied to the said electrode for reduction reaction, and the said electrode for oxidation reaction.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where it enlarges, the electrochemical reaction cell which suppressed the residence of electrolyte solution and the artificial photosynthesis cell using the same can be provided.

It is a figure which shows the structure of the chemical reaction apparatus in embodiment of this invention. It is a figure which shows the structure of the chemical reaction apparatus in embodiment of this invention. It is a figure which shows the structure of the electrode for reduction reaction in embodiment of this invention. It is a figure which shows the structure of the electrode for oxidation reaction in embodiment of this invention. It is a figure which shows the structure of the 1st frame material in embodiment of this invention. It is a figure which shows the structure of the 2nd frame material in embodiment of this invention. It is a figure explaining the flow of the electrolyte solution by providing an inclined part in the 1st frame material in embodiment of this invention. It is a figure which shows the effect by inclination-angle (theta) of the inclination part of the 1st frame material in embodiment of this invention. It is a figure which shows the structure of the flow-path structural member in embodiment of this invention. It is a figure which shows the structure of the flow-path structural member in embodiment of this invention.

  A chemical reaction device 100 according to an embodiment of the present invention includes an oxidation reaction electrode 102, a reduction reaction electrode 104, an electrolytic solution 106, a solar battery cell 108, and a frame, as shown in the cross-sectional view of FIG. The material 110 is comprised. 1 is a cross-sectional view taken along line AA in FIG.

  In the present embodiment, the oxidation reaction electrode 102 and the reduction reaction electrode 104 are plate-like members that expand in the X direction and the Y direction, respectively, and are disposed so as to face each other in the Z direction. By connecting the reduction reaction electrode 104 and the oxidation reaction electrode 102, the reduction reaction electrode 104 and the oxidation reaction electrode 102 are electrically connected.

  The reduction reaction electrode 104 is an electrode used for reducing a substance by a reduction reaction. The reduction reaction electrode 104 is formed on the substrate 114 as shown in the cross-sectional view of FIG. The reduction reaction electrode 104 includes the conductive layer 10 and the conductor layer 12.

The substrate 114 is a member that structurally supports the reduction reaction electrode 104. The material of the substrate 114 is not particularly limited, but is, for example, a glass substrate. Further, the substrate 114 may include, for example, a metal or a semiconductor. The metal used for the substrate 114 is not particularly limited, but silver (Ag), gold (Au), copper (Cu), zinc (Zn), indium (In), cadmium (Cd), tin (Sn) ), Palladium (Pd), and lead (Pb). The semiconductor used as the substrate 114 is not particularly limited, but titanium oxide (TiO ₂ ), tin oxide (SnO ₂ ), silicon (Si), strontium titanate (SrTiO ₃ ), zinc oxide (ZnO), It is preferable to use tantalum oxide (Ta ₂ O ₅ ) or the like. In the case where the substrate 114 includes a metal or a semiconductor, an insulating layer is formed between the reduction reaction electrode 104 and the substrate 114. The insulating layer is not particularly limited, and may be a semiconductor oxide, nitride, resin, or the like. The metal substrate and the reduction reaction electrode 104 may be directly electrically connected.

  The conductive layer 10 is provided to effectively collect current at the reduction reaction electrode 104. The conductive layer 10 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). In particular, it is preferable to use fluorine-doped tin oxide (FTO) in consideration of thermal and chemical stability.

  The conductor layer 12 is made of a conductor containing a material having a reduction catalyst function. The conductor can be made of a material containing a carbon material (C). The size of the carbon material structure is preferably 1 nm or more and 1 μm or less. The carbon material preferably includes, for example, at least one of carbon nanotubes, graphene, and graphite. In the case of graphene and graphite, the size is preferably 1 nm or more and 1 μm or less. If it is a carbon nanotube, it is suitable for a diameter to be 1 nm or more and 40 nm or less. The conductor can be formed by applying a carbon material mixed with a liquid such as ethanol by spraying and heating. It may be applied by spin coating instead of spraying. Alternatively, the solution may be directly dropped and dried without using spin coating.

The complex catalyst is preferably a ruthenium complex, for example. Examples of the complex catalyst include [Ru {4,4′-di (1-H-1-pyrrolopropyl 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-pyrrolopropyl carbonate) -2,2′-bipyridine] (CO) (CH ₃ CN) Cl ₂ ] Etc.

The modification with the complex catalyst can be made by applying a solution obtained by dissolving the complex in an acetonitrile (MeCN) solution on the conductor of the conductor layer 12. The modification with the complex catalyst can also be performed by an electrolytic polymerization method. An electrode of the conductor of the conductor layer 12 as a working electrode, a glass substrate coated with fluorine-containing tin oxide (FTO) as a counter electrode, an Ag / Ag ⁺ electrode as a reference electrode, and Ag / Ag in an electrolyte containing a complex catalyst After flowing a cathode current so as to be a negative voltage with respect to the ⁺ electrode, an anode current is caused so as to be a positive potential with respect to the Ag / Ag ⁺ electrode, whereby a complex catalyst is used on the conductor of the conductor layer 12. Can be modified. Acetonitrile (MeCN) can be used for the electrolyte solution, and Tetrabutylammonium perchlorate (TBAP) can be used for the electrolyte.

  The conductor layer 12 formed in this way is supported, applied or affixed on the conductive layer 10 constituting the reduction reaction electrode 104. Thereby, the reduction reaction electrode 104 including the conductive layer 10 and the conductor layer 12 is formed.

  The oxidation reaction electrode 102 is an electrode used for oxidizing a substance by an oxidation reaction. The oxidation reaction electrode 102 is formed on the substrate 114 as shown in the cross-sectional view of FIG. The oxidation reaction electrode 102 includes the conductive layer 14 and the oxidation catalyst layer 16.

  The substrate 114 is a member that structurally supports the reduction reaction electrode 104. The substrate 114 can be made of the same material as the substrate 114 used for the reduction reaction electrode 104.

  The conductive layer 14 is provided in order to effectively collect current in the oxidation reaction electrode 102. The conductive layer 14 is not particularly limited, but is preferably indium tin oxide (ITO), fluorine-doped tin oxide (FTO), zinc oxide (ZnO), or the like. In particular, it is preferable to use fluorine-doped tin oxide (FTO) in consideration of thermal and chemical stability.

  The oxidation catalyst layer 16 includes a material having an oxidation catalyst function. The material having an oxidation catalyst function can be, for example, a material containing iridium oxide (IrOx). Iridium oxide can be supported on the surface of the conductive layer 14 as a nanocolloid solution (T. Arai et.al, Energy Environ. Sci 8, 1998 (2015)).

For example, a nano colloid of iridium oxide (IrOx) is synthesized. Next, a yellow solution adjusted to pH 13 by adding 10 wt% aqueous sodium hydroxide (NaOH) solution to 50 ml of 2 mM potassium (IV) chloride iridate (K ₂ IrCl ₆ ) solution at 90 ° C. using a hot stirrer. Heat for 20 minutes. The blue solution thus obtained is cooled with ice water for 1 hour. Then, 3M nitric acid (HNO ₃ ) is added dropwise to the cooled solution (20 ml) to adjust to pH 1 and stirred for 80 minutes to obtain a nanocolloid aqueous solution of iridium oxide (IrOx). Further, 1.5 wt% NaOH aqueous solution (1-2 ml) is dropped into this solution to adjust to pH 12. The iridium oxide (IrOx) nanocolloid aqueous solution thus obtained is applied to the conductive layer 14 at a pH of 12, and then dried in a drying oven at 60 ° C. for 40 minutes. After drying, the deposited salt can be washed with ultrapure water to form the oxidation reaction electrode 102. Note that the application and drying of the aqueous iridium oxide (IrOx) nanocolloid solution may be repeated a plurality of times.

The chemical reaction apparatus 100 functions by introducing an electrolytic solution 106 between the reduction reaction electrode 104 and the oxidation reaction electrode 102. For example, as shown in FIG. 1, a frame member 110 is disposed so as to surround the reduction reaction electrode 104 and the oxidation reaction electrode 102, and the reactant is dissolved on the surfaces of the reduction reaction electrode 104 and the oxidation reaction electrode 102. The electrolyte solution 106 is supplied. The reactant can be a carbonized compound, for example, carbon dioxide (CO ₂ ). The electrolyte solution 106 is preferably a phosphate buffer aqueous solution or a borate buffer aqueous solution. In a specific configuration example, a carbon dioxide (CO ₂ ) saturated phosphate buffer tank is provided, and the liquid is supplied to the surfaces of the reduction reaction electrode 104 and the oxidation reaction electrode 102 by a pump, and is generated by a reduction reaction. Formic acid (HCOOH) and oxygen (O ₂ ) are recovered in an external fuel tank.

  Further, the reduction reaction electrode 104 and the oxidation reaction electrode 102 are electrically connected, and an appropriate bias voltage is applied. The means for applying the bias voltage is not particularly limited, and examples thereof include a chemical battery (including a primary battery and a secondary battery), a constant voltage source, and a solar battery. At this time, the positive electrode is connected to the oxidation reaction electrode 102 and the negative electrode is connected to the reduction reaction electrode 104.

  In the present embodiment, the solar battery cell 108 is employed. The solar battery cell 108 can be disposed adjacent to the oxidation reaction electrode 102 and the reduction reaction electrode 104. In the example of FIG. 1, the solar battery cell 108 is disposed on the back surface of the reduction reaction electrode 104, the positive electrode of the solar battery cell 108 is connected to the oxidation reaction electrode 102, and the negative electrode is connected to the reduction reaction electrode 104. .

When synthesizing formic acid (HCOOH) or the like from carbon dioxide (CO ₂ ), water (H ₂ O) is oxidized to supply electrons and protons to carbon dioxide (CO ₂ ). In the vicinity of pH 7, the oxidation potential of water (H ₂ O) is 0.82 V, and the reduction potential is −0.41 V (both are NHE). The reduction potentials from 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 1.43V.

  The frame member 110 is a member that supports the oxidation reaction electrode 102 and the reduction reaction electrode 104 and constitutes a flow path through which the electrolytic solution 106 flows. The frame member 110 is made of a material having mechanical strength necessary for configuring the chemical reaction device 100 as a cell. For example, the frame member 110 can be made of metal, plastic, or the like.

  The frame member 110 is configured by combining the first frame member 110a, the second frame member 110b, and the flow path constituting member 110c. The first frame member 110a and the second frame member 110b are flat members provided with grooves for fitting the oxidation reaction electrode 102 and the reduction reaction electrode 104, respectively.

  As shown in the partial perspective view of FIG. 5, the second frame member 110b is a flat plate member. A rectangular first groove 24 is provided in the second frame member 110b. The first groove 24 serves as a flow path for the electrolytic solution 106 formed between the reduction reaction electrode 104 supported by the second frame member 110b and the oxidation reaction electrode 102 supported by the first frame member 110a. It is a groove constituting a space. That is, the depth of the first groove 24 is preferably set so that the distance between the reduction reaction electrode 104 and the oxidation reaction electrode 102 is a distance suitable for the flow path of the electrolytic solution 106. For example, the depth of the first groove 24 may be set so that the distance between the reduction reaction electrode 104 and the oxidation reaction electrode 102 is about 20 mm. Moreover, the 1st groove | channel 24 also comprises the space for accommodating the flow-path structural member 110c mentioned later.

  A rectangular second groove 22 is provided on the bottom surface of the first groove 24. The second groove 22 is a groove for fitting the reduction reaction electrode 104, and has a shape and size slightly larger than the outer shape of the oxidation reaction electrode 102. The depth of the second groove 22 is approximately the same as the thickness of the reduction reaction electrode 104. The reduction reaction electrode 104 is fitted into the second groove 22 such that the substrate 114 is positioned on the back side of the second groove 22.

  As shown in the partial perspective view of FIG. 6, the first frame member 110a is a flat plate member. A rectangular third groove 28 is provided in the first frame member 110a. The third groove 28 is a groove for fitting the oxidation reaction electrode 102 and has a shape and size slightly larger than the outer shape of the oxidation reaction electrode 102. The depth of the third groove 28 is approximately the same as the thickness of the oxidation reaction electrode 102. The oxidation reaction electrode 102 is fitted into the third groove 28 so that the substrate 114 is positioned on the back side of the third groove 28.

  By combining the first frame member 110a fitted with the oxidation reaction electrode 102 and the second frame member 110b fitted with the reduction reaction electrode 104 facing each other, the first groove 24 is reduced to the oxidation reaction electrode 102 and the reduction reaction electrode 102. It becomes the flow path of the electrolyte solution 106 between the electrodes 104 for reaction. Therefore, as shown in FIGS. 1 and 5, the first groove 24 of the first frame member 110a is provided with an outlet 20 through which the electrolytic solution 106 and a chemical substance generated by an electrochemical reaction are allowed to flow out.

  In the present embodiment, as shown in the perspective view of FIG. 5 and the schematic plan view of FIG. 7, the connecting region 26 connected to the discharge port 20 on the side of the first groove 24 constituting the flow path of the electrolytic solution 106 has an inclination angle. It is preferable to provide a slope where θ is greater than zero. When the inclination angle θ is set to 0 and the connection region 26 connected to the discharge port 20 is not inclined, bubbles of gas (oxygen, hydrogen, etc.) generated in the electrolytic solution 106 by the electrochemical reaction are connected in the vicinity of the discharge port 20. It stays in the area | region 26 and causes the flow of the electrolyte solution 106 to stagnate. On the other hand, by providing the connection region 26 with the inclination angle θ, gas bubbles mixed in the electrolyte solution 106 can easily flow along the inclination of the connection region 26, and the retention of the electrolyte solution 106 can be suppressed. .

  FIG. 8 shows the relationship between the flow rate of the electrolytic solution 106 necessary for sufficiently discharging gas bubbles mixed in the electrolytic solution 106 with respect to the inclination angle θ of the connection region 26. As shown in FIG. 8, if the inclination angle θ is increased, the required flow rate is reduced, and the gas bubbles can be discharged together with the electrolyte 106 more easily. In particular, the effect became remarkable by setting the inclination angle θ to 3 ° or more.

  However, as the inclination angle θ of the connection region 26 is increased, it is necessary to lengthen the first frame member 110a and the second frame member 110b, and the inclination angle θ is appropriately set according to the necessity of downsizing the chemical reaction device 100. It is preferable to set to.

  A flow path component 110 c is disposed in the flow path between the reduction reaction electrode 104 and the oxidation reaction electrode 102. As shown in FIG. 9, the flow path component 110 c includes a frame plate 30, fins 32, and a manifold 34. As shown in FIG. 10, the flow path component member 110 c is disposed so as to be fitted into the concave portion formed of the first groove 24 of the second frame member 110 b. 9 and 10, the flow of the electrolytic solution 106 is indicated by a thick arrow.

  The frame plate 30 is a hollow plate-like member, and is composed of a member having mechanical strength such as metal or resin. The through hole for hollowing the frame plate 30 enables the movement of ions between the oxidation reaction electrode 102 fitted in the second frame member 110b and the reduction reaction electrode 104 fitted in the second frame member 110b. Provided for. The frame plate 30 preferably has a shape that matches the shape of the recess of the first groove 24 so that the frame plate 30 can be fitted into the recess of the first groove 24 of the second frame member 110b.

  The fins 32 are members having a substantially prismatic shape, and a plurality of fins 32 are arranged side by side so as to straddle both edges of the frame plate 30 in a direction (Y direction in the drawing) from one side of the frame plate 30 to the opposite side. The For example, the interval W1 between the fins 32 of the flow path component 110c is 10 mm.

  The manifold 34 is a tubular member having an ejection hole 36 for ejecting the electrolytic solution 106. The manifold 34 is arranged along the direction in which the fins 32 are arranged (X direction in the figure). It is preferable to provide at least one ejection hole 36 provided in the manifold 34 between the adjacent fins 32. In the present embodiment, a configuration in which two ejection holes 36 are provided between adjacent fins 32 is illustrated.

  As described above, the flow path component 110c is disposed so as to be fitted into the recess formed by the first groove 24 of the second frame member 110b, as shown in FIG. In addition, by combining the first frame member 110a and the second frame member 110b, the first frame member 110a in which the oxidation reaction electrode 102 is fitted and the second frame member 110b in which the reduction reaction electrode 104 is fitted are flown. A space delimited by the fins 32 of the path constituent member 110 c becomes a flow path of the electrolytic solution 106. That is, a flow path of the electrolytic solution 106 is formed along a direction from the manifold 34 on the inflow side of the electrolytic solution 106 to the discharge port 20 on the outflow side.

  For example, the inner diameter of the manifold 34 is 9 mm, the diameter of the ejection holes 36 is 0.5 mm, the pitch is 10 mm, and the number of holes is 40. As a result, the inner area of the manifold 34 is 63.6 mm 2, the total area of the ejection holes 36 is 7.85 mm 2, and the ratio is 1/8. At this time, if the flow rate of the electrolytic solution 106 is 110 mL / min, the flow rate in the manifold 34 is 0.0288 m / sec and the flow rate in the ejection hole 36 is 0.233 m / sec from Bernoulli's theorem. That is, the flow velocity in the ejection hole 36 is about 8 times the flow velocity in the manifold 34.

  As described above, by providing the manifold 34, the electrolyte solution 106 can be ejected from the ejection holes 36 substantially uniformly from the inlet side of the electrolyte solution 106 to the opposite end of the manifold 34. Further, by providing the fins 32, the electrolyte solution 106 can be spread over the conductor layer 12 of the reduction reaction electrode 104 and the oxidation catalyst layer 16 of the oxidation reaction electrode 102. Further, by providing the fins 32, it is possible to suppress the electrolyte 106 and the chemical gas generated by the reaction from swirling in the chemical reaction apparatus 100.

  In the present embodiment, the flow path component 110c is provided. However, the flow path component 110c may not be provided. In addition, the flow path component 110c may be configured such that only the manifold 34 is provided without providing the fins 32. In this case, only the effect by the fin 32 can be obtained.

  As described above, according to the chemical reaction device 100 in the present embodiment, it is possible to provide an electrochemical reaction cell that suppresses the retention of the electrolytic solution even when the size is increased, and an artificial photosynthesis cell using the electrochemical reaction cell.

10 conductive layer, 12 conductive layer, 14 conductive layer, 16 oxidation catalyst layer, 20 outlet, 22 second groove, 24 first groove, 26 connection region, 28 third groove, 30 frame plate, 32 fin, 34 manifold , 36 ejection hole, 100 chemical reaction device, 102 oxidation reaction electrode, 104 reduction reaction electrode, 106 electrolyte, 108 solar cell, 110 frame material, 110a frame material, 110b frame material, 110c flow path component, 114 substrate.

Claims (4)

The reduction reaction electrode and the oxidation reaction electrode are spaced apart from each other, and the electrolyte solution is allowed to flow between the reduction reaction electrode and the oxidation reaction electrode, so that the chemical substance contained in the electrolyte solution is reduced. An electrochemical reaction cell for electrochemical reaction,
An inlet for introducing the electrolytic solution between the reduction reaction electrode and the oxidation reaction electrode, and an electrochemical reaction with the electrolytic solution from between the reduction reaction electrode and the oxidation reaction electrode. And an outlet for discharging chemical substances,
An electrochemical reaction cell comprising an inclined portion having an inclination angle of 3 ° or more in a connection region connected to the discharge port in the flow path of the electrolytic solution. The electrochemical reaction cell according to claim 1,
A plurality of introduction holes for supplying the electrolytic solution between the reduction reaction electrode and the oxidation reaction electrode are disposed in a path from the introduction port to the reduction reaction electrode and the oxidation reaction electrode. With a manifold,
The flow rate of the electrolyte solution flowing out from the introduction hole provided farthest from the introduction port is 90% or more of the flow rate of the electrolyte solution flowing out from the introduction hole provided closest to the introduction port. An electrochemical reaction cell, wherein a relationship between a pipe diameter of the manifold and a diameter of the introduction hole is set. The electrochemical reaction cell according to claim 1 or 2,
An electrochemical reaction cell comprising a fin for restricting a flow direction of the electrolytic solution from the introduction port toward the discharge port between the reduction reaction electrode and the oxidation reaction electrode. The electrochemical reaction cell according to any one of claims 1 to 3,
A solar cell module that generates electric power to be supplied to the reduction reaction electrode and the oxidation reaction electrode;
An artificial photosynthesis cell comprising:

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