Hydrogen generation system and power generation system

Abstract

The present invention provides: a hydrogen generation system which can generate hydrogen with higher efficiency than ever before; and a power generation system whereby it becomes possible to reduce the amount of a fossil fuel to be used compared with those in the conventional power generation systems.　The hydrogen generation system is provided with: a first hydrogen generation device for generating hydrogen and hydrogen peroxide; a second hydrogen generation device for decomposing a hydrogen peroxide-containing solution produced in the first hydrogen generation device and containing hydrogen peroxide to produce hydrogen; and a storage device, the hydrogen generation system being configured such that hydrogen generated in the first hydrogen generation device and hydrogen generated in the second hydrogen generation device are stored in the storage device.

Description

Technical Field

[0001] The present invention relates to a hydrogen generation system and a power generation system.

Background Art

[0002] In recent years, with the spread of fuel cell modules, the demand for hydrogen raw materials has been increasing. As a method for producing hydrogen raw materials, photocatalysts that decompose water by sunlight to generate hydrogen have attracted attention (for example, Patent Document 1). The method for producing hydrogen raw materials using photocatalysts can generate hydrogen without emitting carbon dioxide by receiving sunlight with the photocatalyst and applying a voltage, so it has a smaller environmental impact compared to conventional methods for producing hydrogen using fossil fuels.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the amount of hydrogen that can be generated by photocatalysts is not sufficient compared to conventional methods for producing hydrogen using fossil fuels, and further improvement in the amount of hydrogen generation has been desired.

[0005] Therefore, an object of the present invention is to provide a hydrogen generation system that can generate hydrogen with higher efficiency than conventional ones and a power generation system that can reduce the amount of fossil fuel used compared to conventional power generation systems.

Means for Solving the Problems

[0006] One aspect of the present invention for solving the above-mentioned problems is a hydrogen generation system comprising: a first hydrogen generation device that generates hydrogen and hydrogen peroxide; a second hydrogen generation device that decomposes a hydrogen peroxide-containing solution containing the hydrogen peroxide generated in the first hydrogen generation device to generate hydrogen; and a storage device for storing the hydrogen generated in the first hydrogen generation device and the hydrogen generated in the second hydrogen generation device.

[0007] According to this configuration, hydrogen and hydrogen peroxide are produced by the first hydrogen generator, and the hydrogen peroxide produced by the first hydrogen generator is decomposed by the second hydrogen generator to produce hydrogen. Therefore, hydrogen can be produced more efficiently compared to when hydrogen is produced by the first hydrogen generator alone.

[0008] A preferred configuration is that the first hydrogen generation apparatus includes a first hydrogen generation unit having a first photocatalytic electrode and photodecomposing a first electrolyte to generate hydrogen and hydrogen peroxide.

[0009] According to this method, hydrogen and hydrogen peroxide can be produced using light energy, thus reducing the environmental impact.

[0010] A more preferable aspect is that the first electrolyte is water.

[0011] According to this method, the amount of impurities mixed into the hydrogen and hydrogen peroxide generated in the first hydrogen generation unit can be suppressed.

[0012] A more preferred configuration is that the first hydrogen generation apparatus has a solution generation unit that adds a stabilizer to the hydrogen peroxide generated in the first hydrogen generation unit to form the hydrogen peroxide-containing solution.

[0013] According to this pattern, hydrogen peroxide is stabilized, and the supply and transport of hydrogen peroxide-containing solutions become easier.

[0014] A more preferred aspect is that the stabilizer comprises at least one selected from phosphoric acid, calcined sodium phosphate, 8-oxyquinoline, and acetanilide.

[0015] According to this pattern, the stabilizer forms a stabilizing complex with hydrogen peroxide that has a high stability constant, making the hydrogen peroxide-containing solution more stable.

[0016] A preferred configuration is that the second hydrogen generation device includes a second photocatalytic electrode and a second hydrogen generation unit that generates hydrogen by photodecomposing the hydrogen peroxide-containing solution.

[0017] According to this method, hydrogen can be produced from hydrogen peroxide-containing solutions through photodegradation, resulting in a low environmental impact.

[0018] One aspect of the present invention is a power generation system comprising the hydrogen generation system described above and a fuel cell module that uses hydrogen as fuel, wherein the hydrogen stored in the hydrogen generation system is supplied to the fuel electrode of the fuel cell module.

[0019] According to this model, the amount of fossil fuels used can be reduced compared to conventional power generation systems, thereby mitigating the environmental impact.

[0020] One aspect of the present invention is a power generation system comprising a first hydrogen generator that produces hydrogen and hydrogen peroxide, a second hydrogen generator that decomposes a hydrogen peroxide-containing solution containing the hydrogen peroxide produced by the first hydrogen generator to produce hydrogen, a storage device, and a fuel cell module, wherein the hydrogen produced by the first hydrogen generator and the hydrogen produced by the second hydrogen generator are supplied to the fuel electrode of the fuel cell module.

[0021] According to this model, the amount of fossil fuels used can be reduced compared to conventional power generation systems, thereby mitigating the environmental impact. [Effects of the Invention]

[0022] According to the hydrogen generation system of the present invention, hydrogen can be generated with higher efficiency compared to conventional methods. The power generation system of the present invention can reduce the amount of fossil fuels used compared to conventional power generation systems, thereby suppressing the environmental burden. [Brief explanation of the drawing]

[0023] [Figure 1] It is a block diagram conceptually showing the power generation system of the first embodiment of the present invention. [Figure 2] It is an explanatory diagram of the power generation system in FIG. 1. (a) is a model diagram schematically showing the first hydrogen generation part, and (b) is a model diagram schematically showing the second hydrogen generation part.

Embodiments for Carrying Out the Invention

[0024] Hereinafter, embodiments of the present invention will be described in detail.

[0025] As shown in FIG. 1, the power generation system 1 of the first embodiment of the present invention includes, as main components, a first hydrogen generation device 2, a second hydrogen generation device 3, a storage device 5, a fuel cell module 6, and a gas supply device 7, and these are connected by piping or the like. Further, in the power generation system 1, the first hydrogen generation device 2, the second hydrogen generation device 3, and the storage device 5 constitute a hydrogen generation system 8, and are capable of generating hydrogen.

[0026] (First Hydrogen Generation Device 2) As shown in FIG. 1, the first hydrogen generation device 2 includes a first hydrogen generation part 10 and a solution generation part 11. The first hydrogen generation part 10 is a part that generates hydrogen and hydrogen peroxide from the first electrolytic solution 23 by light energy such as sunlight, and is capable of supplying the generated hydrogen to the storage device 5 and supplying the generated hydrogen peroxide to the solution generation part 11. Note that the hydrogen peroxide supplied to the solution generation part 11 may be supplied to the solution generation part 11 in a liquid state or in a gaseous state. As shown in Figure 2(a), the first hydrogen generation unit 10 comprises, as its main components, a first electrolytic cell 20, a first photocatalytic electrode 21, a first counter electrode 22, a first electrolyte 23, and a first auxiliary power supply 25. In the first hydrogen generation unit 10, the first photocatalytic electrode 21 and the first counter electrode 22 are immersed in the first electrolyte 23 inside the first electrolytic cell 20, and the first auxiliary power supply 25 is electrically connected between the first photocatalytic electrode 21 and the first counter electrode 22 outside the first electrolytic cell 20.

[0027] The first photocatalytic electrode 21 is an anode electrode that generates hydrogen peroxide by oxidizing the first electrolyte 23 upon receiving light such as sunlight. As shown in Figure 2(a), the first photocatalytic electrode 21 is formed by laminating the first photocatalyst 31 on the first conductive substrate 30. The first conductive substrate 30 is not particularly limited as long as it is conductive, and for example, a transparent conductive oxide substrate or a metal substrate can be used, in which a transparent conductive oxide is laminated on a transparent substrate. The first photocatalyst 31 is not particularly limited as long as it has photocatalytic activity in the hydrogen peroxide generation reaction. Examples of the first photocatalyst 31 include tungsten trioxide (WO3) catalyst, bismuth vanadate (BiVO4) catalyst, tin oxide (SnO2) catalyst, and titanium dioxide (TiO2) catalyst.

[0028] The first pair electrode 22 is a cathode electrode that pairs with the first photocatalytic electrode 21 and reduces the first electrolyte 23 to generate hydrogen. The first pair electrode 22 is not particularly limited as long as it is conductive; for example, a platinum electrode, a gold electrode, or a silver electrode can be used. The first electrolyte 23 is an electrolyte that generates hydrogen by reduction and hydrogen peroxide by oxidation, and specifically, it is a solution containing water. The first electrolyte 23 can be, for example, water, and from the viewpoint of promoting the reaction, an electrolyte such as sodium bicarbonate may be added to the first electrolyte 23.

[0029] The first auxiliary power supply 25 is a power supply device that applies a voltage to assist the first photocatalytic electrode 21 and the first counter electrode 22 so that the potential difference between the first photocatalytic electrode 21 and the first counter electrode 22, which is generated when the first photocatalytic electrode 21 receives light, is within a predetermined range. The first auxiliary power source 25 is not particularly limited as long as it can apply voltage between the first photocatalytic electrode 21 and the first counter electrode 22, but from the viewpoint of environmental impact, it is preferably a solar cell.

[0030] The solution generation unit 11 is a part that adds a stabilizer to the hydrogen peroxide generated in the first hydrogen generation unit 10 to produce a hydrogen peroxide-containing solution. The stabilizer is not particularly limited as long as it forms a compound that is more stable than hydrogen peroxide when combined with hydrogen peroxide. Examples of stabilizers that can be used include phosphoric acid, calcined sodium phosphate, 8-oxyquinoline, and acetanilide. In this embodiment, the solution generation unit 11 adds phosphoric acid to the hydrogen peroxide generated in the first hydrogen generation unit 10 to produce a hydrogen peroxide-containing solution.

[0031] (Second hydrogen generator 3) The second hydrogen generator 3 is equipped with a second hydrogen generation unit 40, as shown in Figure 1. The second hydrogen generation unit 40 is a part that generates hydrogen from the second electrolyte 53 using light energy such as sunlight, and supplies the generated hydrogen to the storage device 5. As shown in Figure 2(b), the second hydrogen generation unit 40 comprises, as its main components, a second electrolytic cell 50, a second photocatalytic electrode 51, a second counter electrode 52, a second electrolyte 53, and a second auxiliary power supply 55. In the second hydrogen generation unit 40, the second photocatalytic electrode 51 and the second counter electrode 52 are immersed in the second electrolyte 53 inside the second electrolytic cell 50, and the second auxiliary power supply 55 is electrically connected between the second photocatalytic electrode 51 and the second counter electrode 52 outside the second electrolytic cell 50.

[0032] The second photocatalytic electrode 51 is a cathode electrode that generates hydrogen by reducing the second electrolyte 53 upon receiving light such as sunlight. As shown in Figure 2(b), the second photocatalytic electrode 51 is formed by laminating the second photocatalyst 61 on the second conductive substrate 60. The second conductive substrate 60 is not particularly limited as long as it is conductive; for example, a carbon substrate can be used. The second photocatalyst 61 is not particularly limited as long as it has photocatalytic activity in the decomposition reaction of hydrogen peroxide. For example, a metal-free catalyst such as graphite carbon nitride (g-C3N4) with graphene quantum dots (GQDs) supported as a co-catalyst can be used.

[0033] The second pair electrode 52 is paired with the second photocatalytic electrode 51 and is an anode electrode that oxidizes the second electrolyte 53. The second pair electrode 52 is not particularly limited as long as it is conductive; for example, a platinum electrode, a gold electrode, or a silver electrode can be used.

[0034] The second electrolyte 53 is an electrolyte that generates hydrogen upon reduction, and is a hydrogen peroxide-containing solution produced and supplied by the solution generation unit 11. The second electrolyte 53 in this embodiment is a hydrogen peroxide-containing solution obtained by adding phosphoric acid to hydrogen peroxide. The second auxiliary power source 55 is not particularly limited as long as it can apply voltage between the second photocatalytic electrode 51 and the second counter electrode 52, but from the viewpoint of environmental impact, it is preferably a solar cell.

[0035] (Storage device 5) As shown in Figure 1, the storage device 5 temporarily stores the hydrogen produced by the first hydrogen generator 2 and the hydrogen produced by the second hydrogen generator 3. The storage device 5 has a supply adjustment unit that adjusts the amount of hydrogen supplied to the fuel cell module 6, and is capable of supplying hydrogen to the fuel electrode of the fuel cell according to the hydrogen demand of the fuel cell module 6.

[0036] (Fuel cell module 6) The fuel cell module 6 is equipped with a fuel cell having a fuel electrode and an air electrode, and extracts electrical energy from hydrogen supplied to the fuel electrode from the storage device 5 and oxygen supplied to the air electrode from the gas supply device 7. Examples of fuel cells that can be used include polymer electrolyte fuel cells (PEFCs), phosphoric acid fuel cells (PAFCs), and solid oxide fuel cells (SOFCs).

[0037] The gas supply device 7 is a device that supplies oxidizing gas to the air electrode of the fuel cell module 6, and specifically, it is an oxygen supply device that supplies oxygen.

[0038] Next, we will explain an example of the power generation process in power generation system 1.

[0039] First, in the first hydrogen generation device 2, when light such as sunlight is irradiated onto the first photocatalytic electrode 21 of the first hydrogen generation unit 10 from a light source such as the sun, hydrogen peroxide is generated from the first electrolyte 23 on the first photocatalytic electrode 21 due to the light energy, and hydrogen is generated from the first electrolyte 23 on the first counter electrode 22. The hydrogen peroxide generated at the first photocatalytic electrode 21 is extracted in liquid form from the bottom of the first electrolytic cell 20 and supplied to the solution generation unit 11. Furthermore, gaseous by-products (e.g., oxygen) generated at the first photocatalytic electrode 21 are discharged to the outside of the first electrolytic cell 20 from the top of the first electrolytic cell 20. Meanwhile, the hydrogen generated at the first counter electrode 22 is removed from the top of the first electrolytic cell 20 and supplied to the storage device 5, where it is stored.

[0040] The hydrogen peroxide supplied to the solution generation unit 11 has phosphoric acid, which acts as a stabilizer, added to it, and is then supplied as a hydrogen peroxide-containing solution to the second hydrogen generation unit 40 of the second hydrogen generation device 3.

[0041] The hydrogen peroxide-containing solution supplied to the second hydrogen generation unit 40 is used as the second electrolyte 53 in the second hydrogen generation unit 40. In the second hydrogen generator 3, when light such as sunlight is irradiated onto the second photocatalytic electrode 51 of the second hydrogen generation unit 40 from a light source such as the sun, hydrogen is generated from the hydrogen peroxide-containing solution on the second photocatalytic electrode 51 by the light energy. The hydrogen generated at the second photocatalytic electrode 51 is supplied to the storage device 5 and stored in the storage device 5.

[0042] The hydrogen produced in the first hydrogen generator 2 and the second hydrogen generator 3 is mixed in the storage device 5 and supplied to the fuel electrode of the fuel cell module 6 at a constant rate.

[0043] The hydrogen supplied from the storage device 5 reacts with oxygen supplied from the gas supply device 7 in the fuel cell module 6 to form water, and some or all of the reaction energy is extracted as electrical energy.

[0044] According to the hydrogen generation system 8 of this embodiment, hydrogen and hydrogen peroxide are generated by the first hydrogen generator 2, and the hydrogen peroxide generated by the first hydrogen generator 2 is decomposed by the second hydrogen generator 3 to generate hydrogen. Therefore, hydrogen can be generated more efficiently compared to when hydrogen is generated by the first hydrogen generator 2 alone.

[0045] According to the hydrogen generation system 8 of this embodiment, the first hydrogen generation unit 10 photodecomposes the first electrolyte 23 to generate hydrogen and hydrogen peroxide. In other words, since hydrogen and hydrogen peroxide can be generated by decomposing the first electrolyte 23 with light energy, the environmental burden can be suppressed.

[0046] According to the hydrogen generation system 8 of this embodiment, since water is used as the first electrolyte 23, the amount of impurities mixed into the hydrogen and hydrogen peroxide generated in the first hydrogen generation unit 10 can be suppressed.

[0047] According to the hydrogen generation system 8 of this embodiment, a stabilizer is added to the hydrogen peroxide generated in the first hydrogen generation unit 10 in the solution generation unit 11 to form a hydrogen peroxide-containing solution. As a result, the hydrogen peroxide is stabilized by the stabilizer, making it easy to supply and transport the hydrogen peroxide-containing solution. In other words, even if the second hydrogen generation device 3 is located far from the solution generation unit 11, hydrogen peroxide can be easily transported as a hydrogen peroxide-containing solution.

[0048] According to the hydrogen generation system 8 of this embodiment, hydrogen is generated by photodecomposing a hydrogen peroxide-containing solution in the second hydrogen generation unit 40, thus reducing the environmental burden.

[0049] According to the hydrogen generation system 8 of this embodiment, since both the first hydrogen generator 2 and the second hydrogen generator 3 generate hydrogen using light energy, hydrogen can be generated without using fossil fuels, thereby reducing the environmental burden.

[0050] According to the power generation system 1 of this embodiment, since hydrogen stored in the storage device 5 of the hydrogen generation system 8 is supplied to the fuel electrode of the fuel cell module 6, power generation can be achieved without using fossil fuels, thereby reducing the environmental burden.

[0051] According to the hydrogen generation system 8 of this embodiment, the first hydrogen generation unit 10 utilizes the difference between the gaseous and liquid states to extract hydrogen peroxide from the bottom of the first electrolytic cell 20. Therefore, without providing a separation membrane or the like to separate hydrogen peroxide from hydrogen, it is possible to supply substantially only hydrogen peroxide to the solution generation unit 11 without mixing it with hydrogen. As a result, the structure of the apparatus can be simplified. Furthermore, according to the hydrogen generation system 8 of this embodiment, since hydrogen peroxide is extracted from the bottom of the first electrolytic cell 20, even if oxygen is produced as a byproduct on the first photocatalytic electrode 21, substantially only hydrogen peroxide can be supplied to the solution generation unit 11 without mixing it with oxygen. As a result, mixing of hydrogen and oxygen in the second hydrogen generation unit 40 of the second hydrogen generation device 3 can be suppressed.

[0052] In the embodiment described above, the first hydrogen generation unit 10 of the first hydrogen generator 2 and the storage device 5 were connected by piping, and the hydrogen generated in the first hydrogen generation unit 10 was supplied to the storage device 5 via the piping. However, the present invention is not limited to this. The hydrogen generated in the first hydrogen generation unit 10 may be temporarily stored in a storage member such as a hydrogen storage alloy tank or a hydrogen cylinder, the storage member may be transported to the storage device 5, and hydrogen may be supplied from the storage member to the storage device 5.

[0053] In the embodiment described above, the solution generation unit 11 of the first hydrogen generator 2 and the second hydrogen generation unit 40 of the second hydrogen generator 3 were connected by piping, and a hydrogen peroxide-containing solution was supplied from the solution generation unit 11 to the second hydrogen generation unit 40 via the piping. However, the present invention is not limited to this. The hydrogen peroxide-containing solution may be manually supplied from the solution generation unit 11 to the second hydrogen generation unit 40. For example, the hydrogen peroxide-containing solution may be temporarily stored in a transport tank in the solution generation unit 11 of the first hydrogen generator 2, the transport tank may be transported to the second hydrogen generation unit 40 of the second hydrogen generator 3, and the hydrogen peroxide-containing solution may be supplied from the transport tank to the second hydrogen generation unit 40.

[0054] In the embodiment described above, the second hydrogen generation unit 40 of the second hydrogen generator 3 and the storage device 5 were connected by piping, and the hydrogen generated in the second hydrogen generation unit 40 was supplied to the storage device 5 via the piping. However, the present invention is not limited to this. The hydrogen generated in the second hydrogen generation unit 40 may be temporarily stored in a storage member such as a hydrogen storage alloy tank or a hydrogen cylinder, the storage member may be transported to the storage device 5, and hydrogen may be supplied from the storage member to the storage device 5.

[0055] In the embodiment described above, the storage device 5 and the fuel cell module 6 are connected by piping, and the hydrogen stored in the storage device 5 is supplied to the fuel electrode of the fuel cell module 6 via the piping; however, the present invention is not limited to this. The hydrogen generated in the storage device 5 may be temporarily stored in storage components such as hydrogen storage alloy tanks or hydrogen cylinders, the storage components may be transported to the fuel cell module 6, and hydrogen may be supplied from the storage components to the fuel cell module 6.

[0056] In the embodiment described above, the gas supply device 7 supplied oxygen as an oxidizing gas to the air electrode of the fuel cell module 6, but the present invention is not limited thereto. The type of oxidizing gas supplied by the gas supply device 7 is not particularly limited as long as it functions at the air electrode of the fuel cell module 6.

[0057] In the embodiment described above, all of the hydrogen peroxide generated in the first hydrogen generation unit 10 of the first hydrogen generator 2 was supplied to the solution generation unit 11, but the present invention is not limited thereto. A portion of the hydrogen peroxide generated in the first hydrogen generation unit 10 may be used for other purposes.

[0058] In the embodiments described above, solar cells were used as auxiliary power sources 25 and 55, but the present invention is not limited thereto. The auxiliary power sources 25 and 55 may be other power sources.

[0059] In the embodiment described above, the first auxiliary power supply 25 and the second auxiliary power supply 55 were provided separately, but the present invention is not limited thereto. The first auxiliary power supply 25 and the second auxiliary power supply 55 may be a shared auxiliary power supply.

[0060] In the embodiment described above, hydrogen generated in the first hydrogen generation unit 10 and hydrogen generated in the second hydrogen generation unit 40 were supplied to the fuel cell module 6 via the storage device 5, but the present invention is not limited thereto. Hydrogen generated in the first hydrogen generation unit 10 and hydrogen generated in the second hydrogen generation unit 40 may be supplied directly to the fuel cell module 6 without going through the storage device 5.

[0061] In the embodiment described above, hydrogen peroxide was extracted from the bottom of the first hydrogen generation unit 10, but the present invention is not limited thereto. Hydrogen peroxide may be extracted from the side of the first hydrogen generation unit 10, as long as it is within the range filled with the first electrolyte 23 from the bottom of the first hydrogen generation unit 10.

[0062] In the embodiment described above, hydrogen and by-product gases such as oxygen were extracted from the top of the first hydrogen generation unit 10, but the present invention is not limited thereto. Hydrogen and by-product gases such as oxygen may be extracted from the side of the first hydrogen generation unit 10, as long as it is above the liquid level of the first electrolyte 23.

[0063] In the embodiments described above, the components can be freely substituted or added between each embodiment, as long as they fall within the technical scope of the present invention. [Explanation of Symbols]

[0064] 1. Power generation system 2. First Hydrogen Generator 3. Second Hydrogen Generator 5. Storage device 6. Fuel cell module 8. Hydrogen generation system 10. First hydrogen generation unit 11 Solution generation section 21 1st photocatalytic electrode 23 First electrolyte 40 Second hydrogen generation unit 51 Second photocatalytic electrode 53 Second electrolyte

Claims

1. A first hydrogen generator that produces hydrogen and hydrogen peroxide, A second hydrogen generator that decomposes a hydrogen peroxide-containing solution containing hydrogen peroxide produced by the first hydrogen generator to produce hydrogen, The system includes a storage device for storing the hydrogen produced by the first hydrogen generator and the hydrogen produced by the second hydrogen generator. The second hydrogen generation apparatus is a hydrogen generation system comprising a second hydrogen generation unit having a second photocatalytic electrode and generating hydrogen by photodecomposing the hydrogen peroxide-containing solution.

2. The hydrogen generation system according to claim 1, wherein the first hydrogen generation apparatus has a first photocatalytic electrode and comprises a first hydrogen generation unit that photodecomposes a first electrolyte to generate hydrogen and hydrogen peroxide.

3. The hydrogen generation system according to claim 2, wherein the first electrolyte is water.

4. The hydrogen generation system according to claim 2 or 3, wherein the first hydrogen generation apparatus has a solution generation unit that adds a stabilizer to the hydrogen peroxide generated in the first hydrogen generation unit to form the hydrogen peroxide-containing solution.

5. The hydrogen generation system according to claim 4, wherein the stabilizer comprises at least one selected from phosphoric acid, calcined sodium phosphate, 8-oxyquinoline, and acetanilide.

6. A hydrogen generation system according to any one of claims 1 to 3, and a fuel cell module that uses hydrogen as fuel, A power generation system that supplies hydrogen stored in the hydrogen generation system to the fuel electrode of the fuel cell module.

7. The system comprises a first hydrogen generator that produces hydrogen and hydrogen peroxide, a second hydrogen generator that decomposes a hydrogen peroxide-containing solution containing hydrogen peroxide produced by the first hydrogen generator to produce hydrogen, a storage device, and a fuel cell module. The second hydrogen generation apparatus has a second photocatalytic electrode and includes a second hydrogen generation unit that generates hydrogen by photodecomposing the hydrogen peroxide-containing solution. A power generation system that supplies hydrogen produced by the first hydrogen generator and hydrogen produced by the second hydrogen generator to the fuel electrode of the fuel cell module.

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