JP5730032B2 - Structure for carbon nanotube electrode, carbon nanotube electrode, and dye-sensitized solar cell - Google Patents

Description

  The present invention relates to a carbon nanotube electrode structure, a carbon nanotube electrode, and a dye-sensitized solar cell.

  Carbon nanotube electrodes are attracting attention as electrodes for dye-sensitized solar cells, lithium ion secondary batteries, lithium ion capacitors, electric double layer capacitors, fuel cells and the like.

  The carbon nanotube electrode includes a substrate, a catalyst supported on the substrate, and a carbon nanotube film formed on the catalyst. Here, when the carbon nanotube film is formed on a catalyst supported on a substrate, a chemical vapor deposition method (hereinafter referred to as “CVD method” in this specification) is usually used. In this CVD method, carbon nanotubes are grown from a catalyst supported on a substrate in an atmosphere containing carbon such as hydrocarbon gas at a high temperature of 400 to 900 ° C. (see, for example, Patent Documents 1 and 2 below).

JP 2004-284921 A JP 2006-202721 JP

  By the way, in an electric double layer capacitor, a dye-sensitized solar cell, etc., it is generally necessary to make the substrate thin to 50 μm or less because of the necessity of energy density and flexibility. Therefore, when the carbon nanotube film is formed on the substrate, if the temperature of the source gas such as hydrocarbon gas used is set to a high temperature of 600 to 900 ° C., a phenomenon called so-called carburization in which carbon enters the substrate by the source gas occurs. . As a result, the substrate is cured and the conductivity is lowered.

  In particular, this problem occurs remarkably in dye-sensitized solar cells. That is, in a dye-sensitized solar cell, since iodine is usually used as an electrolyte, titanium is used as a substrate material from the viewpoint of suppressing corrosion of the substrate by iodine. However, since titanium forms a very stable carbide, the thin titanium substrate easily loses its conductivity due to carburization, the flexibility is lowered, and in the worst case, it may be damaged.

  Therefore, a carbon nanotube electrode structure capable of forming a carbon nanotube electrode excellent in conductivity and flexibility has been desired.

  The present invention has been made in view of the above circumstances, and provides a carbon nanotube electrode structure, a carbon nanotube electrode, and a dye-sensitized solar cell capable of forming a carbon nanotube electrode excellent in conductivity and flexibility. The purpose is to provide.

  As a result of intensive studies to solve the above problems, the present inventor shall constitute a metal substrate with a main body portion and a metal film covering at least a part thereof, and the metal film shall contain a specific metal. The present inventors have found that the above problems can be solved, and have completed the present invention.

That is, the present invention includes a metal substrate and a metal catalyst supported on the metal substrate and acting as a catalyst when forming the carbon nanotube film, and the metal substrate includes the first main surface and the first main surface. A main body having a second main surface opposite to the main surface; and a metal coating covering at least one of the first main surface and the second main surface of the main body, the main body being , iron, chromium, cobalt, contains at least one selected from the group consisting of nickel and titanium, carbon nanotubes wherein the metal coating is viewed contains aluminum, the body portion and having a thickness of 1~40μm This is an electrode structure.

  According to the carbon nanotube electrode structure, when the carbon nanotube film is grown on the carbon nanotube electrode structure by a CVD method using a raw material containing carbon, the metal coating contains aluminum. Carburization to the main body can be sufficiently suppressed. Therefore, a carbon nanotube electrode excellent in conductivity and flexibility can be formed.

  The structure for carbon nanotube electrodes according to the present invention is useful when the main body has a thickness of 1 to 100 μm. This is because when the thickness of the main body is within the above range, the main body is particularly easily carburized and the problem of reduced flexibility is likely to occur.

  In the carbon nanotube electrode structure, it is preferable that the metal coating covers both the first main surface and the second main surface.

  In this case, when the carbon nanotube film is grown on the carbon nanotube electrode structure using the raw material containing carbon using the CVD method, carburization of the main body can be more sufficiently suppressed.

  In addition, the carbon nanotube electrode structure in which the metal catalyst is provided on either the first main surface or the second main surface of the main body is useful as a counter electrode of the dye-sensitized solar cell. .

  Further, the present invention is a carbon nanotube electrode obtained by forming a carbon nanotube film on a carbon nanotube electrode structure described above using a raw material containing carbon by a CVD method.

  According to this carbon nanotube electrode, even when the carbon nanotube film is formed on the carbon nanotube electrode structure by the CVD method using the raw material containing carbon, carburization to the main body is sufficiently suppressed. For this reason, the obtained carbon nanotube electrode is excellent in conductivity and flexibility.

  Furthermore, the present invention provides a dye-sensitized solar cell comprising a working electrode, a counter electrode, a sealing part that connects the working electrode and the counter electrode, and an electrolyte surrounded by the working electrode, the counter electrode, and the sealing part. The counter electrode is formed of a carbon nanotube electrode obtained by forming a carbon nanotube film using a raw material containing carbon by a CVD method on the carbon nanotube electrode structure described above, and for the carbon nanotube electrode In the structure, the metal coating covers both the first main surface and the second main surface, and the metal catalyst is on one side of the first main surface and the second main surface. It is a dye-sensitized solar cell characterized by being provided in.

According to this dye-sensitized solar cell, a carbon nanotube electrode obtained by forming a carbon nanotube film using a raw material containing carbon on a carbon nanotube electrode structure by a CVD method is used as a counter electrode. For this reason, the carburization of the counter electrode is sufficiently suppressed, and therefore has excellent conductivity and flexibility. Therefore, according to the dye-sensitized solar cell of the present invention, excellent photoelectric conversion characteristics can be obtained, and it can be used in an area where the temperature change is severe, and even if bending stress is repeatedly applied to the counter electrode due to expansion of the electrolyte, Damage can be sufficiently prevented.
The present invention also includes a metal substrate and a metal catalyst supported on the metal substrate and acting as a catalyst when forming the carbon nanotube film, wherein the metal substrate is supported by the first metal catalyst. A main body having a main surface and a second main surface opposite to the first main surface; and a metal coating covering the second main surface of the main body, wherein the main body is The carbon nanotube electrode structure may include at least one selected from the group consisting of iron, chromium, cobalt, nickel, and titanium, and the metal coating includes aluminum.

  ADVANTAGE OF THE INVENTION According to this invention, the structure for carbon nanotube electrodes which can form the carbon nanotube electrode excellent in electroconductivity and flexibility, a carbon nanotube electrode, and a dye-sensitized solar cell are provided.

It is sectional drawing which shows schematically suitable embodiment of the dye-sensitized solar cell which concerns on this invention. It is sectional drawing which shows the counter electrode of FIG. 1 schematically. It is sectional drawing which shows the main-body part of a metal substrate. It is sectional drawing which shows a metal substrate. It is sectional drawing which shows one Embodiment of the structure for carbon nanotube electrodes of FIG. FIG. 6 is a cross-sectional view showing a first modification of the carbon nanotube electrode structure of FIG. 5. FIG. 6 is a cross-sectional view showing a second modification of the carbon nanotube electrode structure of FIG. 5. FIG. 6 is a cross-sectional view showing a third modification of the carbon nanotube electrode structure in FIG. 5.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing a dye-sensitized solar cell obtained by the method for producing a dye-sensitized solar cell according to the present invention, and FIG. 2 is a cross-sectional view schematically showing a counter electrode of FIG.

  As shown in FIG. 1, the dye-sensitized solar cell 100 includes a working electrode 10 and a counter electrode 20 disposed to face the working electrode 10. The working electrode 10 and the counter electrode 20 are connected by a sealing portion 40. The cell space surrounded by the working electrode 10, the counter electrode 20, and the sealing portion 40 is filled with an electrolyte 30.

  The working electrode 10 includes a transparent substrate 60, a transparent conductive film 70 provided on the counter electrode 20 side of the transparent substrate 60, and a porous oxide semiconductor layer 80 provided on the transparent conductive film 70. The porous oxide semiconductor layer 80 carries a photosensitizing dye.

  The counter electrode 20 is composed of a carbon nanotube electrode. As shown in FIG. 2, the carbon nanotube electrode includes a carbon nanotube electrode structure 1 and a carbon nanotube film 2 formed on the carbon nanotube electrode structure 1. The carbon nanotube electrode structure 1 includes a metal substrate 3 and a metal catalyst 4 supported on one surface of the metal substrate 3 and acting as a catalyst when the carbon nanotube film 2 is formed. The columnar body extends from the metal catalyst 4 in the opposite direction to the metal substrate 3.

  The metal substrate 3 includes a main body 5, a metal coating 6 a that covers the first main surface 5 a of the main body 5, and a metal coating 6 b that covers the second main surface 5 b of the main body 5.

  Here, the main-body part 5 contains iron, chromium, cobalt, nickel, titanium, or these 2 or more types of alloys. Here, the alloy includes, for example, SUS. Here, it is preferable that the said material is contained in the main-body part 5 in the ratio of 90 mass% or more, and it is more preferable that it is contained in the ratio of 95 mass% or more.

  The metal coatings 6a and 6b contain aluminum.

  Next, the manufacturing method of the dye-sensitized solar cell 100 described above will be described with reference to FIGS.

<Counter electrode manufacturing process>
First, a method for manufacturing the counter electrode 20 will be described.

(Board preparation process)
First, as shown in FIG. 3, a substrate to be the main body 5 of the metal substrate 3 is prepared.

  As described above, the main body 5 includes iron, chromium, cobalt, nickel, and titanium. These metal materials can be used alone or as an alloy of two or more. The metal material is a metal material that is particularly easily carburized when the carbon nanotube film 2 is formed using a raw material containing carbon by a CVD method.

  Although the thickness of the main body 5 is not particularly limited, the carbon nanotube electrode structure 1 is useful when the thickness of the main body 5 is 1 to 100 μm. This is because when the thickness of the main body portion 5 is in the above range, the main body portion 5 is particularly easily carburized and the problem of a decrease in flexibility is likely to occur. The carbon nanotube electrode structure 1 is further useful when the thickness of the main body 5 is 1 to 50 μm.

  Next, as shown in FIG. 4, the metal substrate 3 is formed by covering the first main surface 5a and the second main surface 5b of the main body 5 with the metal coating 6a and the metal coating 6b, respectively.

  Here, the metal coatings 6a and 6b contain aluminum as described above. The reason why the metal coatings 6 a and 6 b include aluminum is that aluminum is difficult to alloy with carbon and does not adversely affect the formation of the metal catalyst 4. Therefore, the metal coatings 6a and 6b may be an alloy of aluminum and another metal. Here, examples of the other metal include magnesium. However, from the viewpoint of improving conductivity, the metal coatings 6a and 6b preferably contain aluminum in a proportion of 90% by mass or more, and more preferably contain 100% by mass.

  The metal coatings 6a and 6b can cover the first main surface 5a and the second main surface 5b by using, for example, a sputtering method.

  Next, as shown in FIG. 5, the metal catalyst 4 is formed on the metal film 6a. The metal catalyst 4 may be any metal that acts as a catalyst when the carbon nanotube film 2 is formed. Examples of such a metal catalyst 4 include nickel, cobalt, molybdenum, titanium, iron, palladium, tungsten, gold, Aluminum etc. are mentioned. These can be used alone or in combination of two or more. The metal catalyst 4 may be in the form of a film, or may be in the form of particles as shown in FIG. The metal catalyst 4 can be formed, for example, by heating a film formed by sputtering on the metal film 6a in a reducing atmosphere.

  Thus, as shown in FIG. 5, the carbon nanotube electrode structure 1 in which the metal catalyst 4 is supported on the first main surface 5a of the metal substrate 3 is obtained.

(Film formation process)
After the carbon nanotube electrode structure 1 is obtained in this way, the carbon nanotube film 2 is formed on the metal catalyst 4 of the carbon nanotube electrode structure 1 by a CVD method using a raw material containing carbon.

  As a raw material containing carbon, for example, methane, ethylene, acetylene, alcohol and the like are used. Here, the raw material should just contain carbon, and hydrogen gas etc. may be contained in addition to carbon. In the CVD method, heat or plasma is used as an energy source.

  At this time, the pressure at the time of growing the carbon nanotube film 2 is usually 100 to 150,000 Pa, preferably 1000 to 122000 Pa. Moreover, the temperature at the time of growing the carbon nanotube film | membrane 2 is 400-900 degreeC normally, Preferably it is 550-800 degreeC.

  Thus, carbon nanotubes grow on the metal catalyst 4 to form columnar bodies, and the carbon nanotube film 2 is formed by these columnar bodies. Thus, the counter electrode 20 is obtained (see FIG. 2).

  When the counter electrode 20 made of the carbon nanotube electrode is produced using the carbon nanotube electrode structure 1 as described above, the carbon nanotube film 2 is formed on the carbon nanotube electrode structure 1 using a raw material containing carbon by a CVD method. When growing the steel, carburization of the main body 5 can be sufficiently suppressed. Therefore, the counter electrode 20 excellent in conductivity and flexibility can be formed.

<Manufacturing process of working electrode>
The working electrode 10 is obtained by forming a transparent conductive film 70 on a transparent substrate 60 to form a laminate, and then forming a porous oxide semiconductor layer 80 on the transparent conductive film 70 of the laminate. Can do. The porous oxide semiconductor layer 80 carries a photosensitizing dye.

<Sealing process>
Next, the sealing portion 40 is formed on the working electrode 10. Then, the electrolyte 30 is printed or injected inside the sealing portion 40. Then, the counter electrode 20 is overlaid on the working electrode 10, and the working electrode 10 and the counter electrode 20 are connected by, for example, heating and melting the sealing portion 40 to seal the electrolyte 50. Thus, the dye-sensitized solar cell 100 is obtained.

  When the dye-sensitized solar cell 100 is manufactured in this manner, carburization of the main body 5 in the metal substrate 3 of the counter electrode 20 is sufficiently suppressed, and therefore the counter electrode 20 has excellent conductivity and flexibility. doing. Therefore, according to the dye-sensitized solar cell 100, excellent photoelectric conversion characteristics can be obtained, and even when a bending stress is repeatedly applied to the counter electrode 20 due to expansion of the electrolyte 30, the counter electrode 20 is used even in a region where the temperature changes rapidly. Can be sufficiently prevented.

  The present invention is not limited to the above embodiment. For example, in the said embodiment, although the 1st main surface 5a and the 2nd main surface 5b of the main-body part 5 are coat | covered with the metal coatings 6a and 6b, only the 1st main surface 5a is a metal coating as shown in FIG. The second main surface 5b may not be covered with a metal coating.

  Moreover, in the said embodiment, although the metal catalyst 4 is carry | supported by the 1st main surface 5a of the main-body part 5 via the metal film 6a, the metal film 6a is omissible. That is, as shown in FIG. 7, the metal catalyst 4 may be directly supported on the first main surface 5 a of the main body 5.

  Furthermore, in the said embodiment, although the metal catalyst 4 is carry | supported only by the 1st main surface 5a side of the main-body part 5, when using a carbon nanotube electrode as an electrode of an electrical double layer capacitor or a lithium ion secondary battery As shown in FIG. 8, the metal catalyst 4 is further supported on the metal coating 6b.

  Hereinafter, the content of the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.

Example 1
A titanium substrate having a thickness of 40 μm serving as a main body was prepared. And the 1st main surface of the titanium substrate was coat | covered with the nickel thin film of thickness 0.001 micrometer used as a catalyst at the time of forming a carbon nanotube. The nickel thin film was formed by sputtering. Next, the second main surface of the titanium substrate was covered with a metal film made of aluminum and having a thickness of 50 nm. Thus, a carbon nanotube electrode structure was obtained. The carbon nanotube electrode structure is placed in a chamber of an MPCVD (Microwave Plasma Chemical Vapor Deposition) process apparatus, the microwave output is set to 300 W, a mixed gas of hydrogen and methane is introduced, and the pressure is 2667 Pa. A carbon nanotube film having a thickness of 20 μm was grown on the nickel thin film of the carbon nanotube electrode structure at a temperature of 650 ° C. The carbon nanotube film was cooled to room temperature in the chamber and then taken out. Thus, a counter electrode composed of a carbon nanotube electrode was obtained.

Next, a working oxide was obtained by forming a 20 μm thick porous oxide semiconductor film made of TiO ₂ on an FTO / glass substrate having an FTO film formed on a glass substrate. The working electrode was supported with 2-2-7 tetrabutylammonium-trithiocyanato (4,4 ′, 4 ″ -tricarbonyl-2,2 ′, 2 ″ -terpyridine) ruthenium (II) (black dye).

  And after arrange | positioning the square-shaped annular resin sheet which consists of a binel (brand name, DuPont company make) on a working electrode, the resin sheet was heat-melted and it was made to adhere | attach on a working electrode. Thus, the sealing portion was provided on the working electrode.

  Next, the working electrode provided with the sealing portion is disposed so as to be horizontal, and inside the sealing portion, a volatile solvent made of acetonitrile is used as a main solvent, 0.05M of iodine and 0.1M of lithium iodide. An electrolyte containing 0.6 M of 1,2-dimethyl-3-propylimidazolium iodide (DMPII) and 0.5 M of 4-tert-butylpyridine was injected.

  Then, the counter electrode obtained as described above was superposed on the working electrode, and the working electrode and the counter electrode were connected by thermocompression bonding of the counter electrode, the sealing portion, and the working electrode to seal the electrolyte. Thus, a dye-sensitized solar cell was obtained.

(Example 2)
Except that the thickness of the titanium substrate was changed from 40 μm to 3 μm and a resin sheet made of PET for sealing the pinhole of the titanium substrate was attached to the second main surface, the dye increase was performed in the same manner as in Example 1. A solar cell was prepared.

(Example 3)
The dye increase was performed in the same manner as in Example 1 except that the thickness of the titanium substrate was changed from 40 μm to 10 μm and a resin sheet made of PET for sealing the pinholes of the titanium substrate was attached to the second main surface. A solar cell was prepared.

Example 4
A dye-sensitized solar cell was produced in the same manner as in Example 1 except that the thickness of the titanium substrate was changed from 40 μm to 20 μm.

(Example 5)
A dye-sensitized solar cell was produced in the same manner as in Example 1 except that the thickness of the titanium substrate was changed from 40 μm to 100 μm.

(Example 6)
A dye-sensitized solar cell was produced in the same manner as in Example 1 except that the thickness of the metal coating film made of aluminum was changed from 50 nm to 100 nm.

(Example 7)
Implemented except that the thickness of the metal coating made of aluminum was changed from 50 nm to 100 μm (100,000 nm), and a metal coating made of aluminum having a thickness of 10 nm was formed between the first main surface of the titanium substrate and the nickel thin film. A dye-sensitized solar cell was produced in the same manner as in Example 1. In addition, the metal film between the 1st main surface of a titanium substrate and a nickel thin film was formed by sputtering method similarly to the metal film of Example 1.

(Example 8)
A dye-sensitized solar cell was produced in the same manner as in Example 1 except that the titanium substrate was changed to a stainless steel substrate (SUS304) made of an alloy of iron, chromium and nickel.

Example 9
A dye-sensitized solar cell was produced in the same manner as in Example 1 except that the titanium substrate was changed to an iron, nickel and cobalt alloy substrate (Inconel 903).

(Comparative Example 1)
When producing the counter electrode, a dye-sensitized solar cell was produced in the same manner as in Example 1 except that a metal film made of aluminum was not formed.

(Comparative Example 2)
At the time of producing the counter electrode, an attempt was made to produce a dye-sensitized solar cell in the same manner as in Example 2 except that a metal film made of aluminum was not formed. However, since the flexibility of the substrate was low, the dye-sensitized solar cell It broke during battery fabrication.

(Comparative Example 3)
When preparing the counter electrode, an attempt was made to prepare a dye-sensitized solar cell in the same manner as in Example 3 except that a metal film made of aluminum was not formed. However, since the flexibility of the substrate was low, the dye-sensitized solar cell It broke during battery fabrication.

(Comparative Example 4)
At the time of producing the counter electrode, an attempt was made to produce a dye-sensitized solar cell in the same manner as in Example 4 except that a metal film made of aluminum was not formed. However, since the flexibility of the substrate was low, the dye-sensitized solar cell It broke during battery fabrication.

(Comparative Example 5)
When producing the counter electrode, an attempt was made to produce a dye-sensitized solar cell in the same manner as in Example 5 except that a metal film made of aluminum was not formed. However, since the flexibility of the substrate was low, the dye-sensitized solar cell It broke during battery fabrication.

(Comparative Example 6)
After coating the entire surface of the titanium substrate with a copper plating film having a thickness of 0.1 μm, a nickel thin film was formed on the first main surface of the titanium substrate via the copper plating film, and a metal film made of aluminum was not formed. A carbon nanotube structure was prepared in the same manner as in Example 1 except that. When a carbon nanotube film was grown on the carbon nanotube structure in the same manner as in Example 1, the carbon nanotube film could not be formed.

(Comparative Example 7)
After covering the entire surface of the titanium substrate with a 0.1 μm thick nichrome plating film, a nickel thin film was formed on the first main surface of the titanium substrate via the nichrome plating film, and a metal film made of aluminum was not formed. A carbon nanotube structure was prepared in the same manner as in Example 1 except that. When a carbon nanotube film was grown on the carbon nanotube structure in the same manner as in Example 1, the carbon nanotube film could not be formed. That is, amorphous carbon was formed on the carbon nanotube structure.

(Comparative Example 8)
A dye-sensitized solar cell was produced in the same manner as in Example 8 except that a metal film made of aluminum was not formed.

(Comparative Example 9)
A dye-sensitized solar cell was produced in the same manner as in Example 9 except that a metal film made of aluminum was not formed.

[Evaluation]
(Carburization to substrate)
About the counter electrode of Examples 1-9 and Comparative Examples 1-9, it was investigated by SEM observation of a cross section and energy dispersive X-ray fluorescence spectroscopy whether the carburization to the board | substrate has occurred. The results are shown in Table 1. The evaluation criteria for carburizing the substrate were as follows.
No carburizing to substrate ... A
There is carburizing to the substrate ... B

(Counterelectrode conductivity)
About the counter electrode of Examples 1-9 and Comparative Examples 1-9, the impedance of the produced dye-sensitized solar cell was measured and the resistance of the counter electrode was estimated. The results are shown in Table 1. In addition, the evaluation criteria regarding the electroconductivity of a counter electrode were as follows according to the value of resistance.
Less than 5.0Ω ・ ・ ・ Pass over 5.0Ω ・ ・ ・ ・ Fail

(Flexibility of counter electrode)
For the counter electrodes of Examples 1 to 9 and Comparative Examples 1 to 9, when bending by 180 degrees with the curvature of R5, if there is no shape change before and after bending, ○, if the shape change is Δ, The flexibility of the counter electrode was examined. The results are shown in Table 1. In addition, the evaluation criteria regarding the flexibility of the counter electrode were as follows.
○ ・ ・ ・ ・ ・ ・ Pass △ or × ・ ・ ・ Fail

(Photoelectric conversion characteristics)
About the dye-sensitized solar cell of Examples 1-9 and Comparative Examples 1-9, the photoelectric conversion efficiency was measured on the conditions of the radiance of 1.5AM and 100mW / cm < ² > with the solar simulator. The results are shown in Table 1.

  From the results shown in Table 1, all the counter electrodes of Examples 1 to 9 were acceptable in terms of conductivity and flexibility. On the other hand, the counter electrodes of Comparative Examples 1 to 9 failed in at least one of conductivity and flexibility. In addition, in the dye-sensitized solar cell of Examples 1-9, all had high photoelectric conversion efficiency. This is probably due to the high conductivity at the counter electrode.

  Moreover, carburizing to the board | substrate was seen in all the comparative examples 1-9. Moreover, all the flexibility of the counter electrode of Comparative Examples 1-9 was disqualified. From this, it is considered that the decrease in the flexibility of the counter electrode is caused by carburizing the substrate.

  From the above, it was confirmed that the carbon nanotube electrode structure of the present invention can form a carbon nanotube electrode excellent in conductivity and flexibility.

DESCRIPTION OF SYMBOLS 1 ... Carbon nanotube electrode structure 2 ... Carbon nanotube film 3 ... Metal substrate 4 ... Metal catalyst 5 ... Main-body part 5a ... 1st main surface 5b ... 2nd main surface 6a, 6b ... Metal coating 10 ... Working electrode 20 ... Counter electrode DESCRIPTION OF SYMBOLS 30 ... Electrolyte 40 ... Sealing part 100 ... Dye-sensitized solar cell

Claims (6)

A metal substrate;
A metal catalyst supported on the metal substrate and acting as a catalyst when forming a carbon nanotube film;
The metal substrate covers at least one of a first main surface and a second main surface opposite to the first main surface, and the first main surface and the second main surface of the main body. A metal coating,
The main body includes at least one selected from the group consisting of iron, chromium, cobalt, nickel, and titanium,
Wherein the metal coating is viewed contains aluminum,
The main body has a thickness of 1 to 40 μm ;
A carbon nanotube electrode structure characterized by the above. Wherein the metal coating, covers both said first main surface and the second major surface, a carbon nanotube electrode structure according to claim 1. The carbon nanotube electrode structure according to claim 1 or 2 , wherein the metal catalyst is provided on one side of the first main surface and the second main surface of the main body. A carbon nanotube electrode obtained by forming a carbon nanotube film on a carbon nanotube electrode structure according to any one of claims 1 to 3 using a raw material containing carbon by a chemical vapor deposition method. . A metal substrate;
  A metal catalyst supported on the metal substrate and acting as a catalyst when forming a carbon nanotube film;
  The metal substrate covers a main body having a first main surface on which the metal catalyst is supported and a second main surface opposite to the first main surface, and the second main surface of the main body. A metal coating,
  The main body includes at least one selected from the group consisting of iron, chromium, cobalt, nickel, and titanium,
  The metal coating comprises aluminum;
A carbon nanotube electrode structure characterized by the above. Working electrode,
With the counter electrode,
A sealing portion connecting the working electrode and the counter electrode;
In a dye-sensitized solar cell comprising the working electrode, the counter electrode, and an electrolyte surrounded by the sealing portion,
The counter electrode is
A carbon nanotube electrode obtained by forming a carbon nanotube film on the carbon nanotube electrode structure according to claim 1 by using a raw material containing carbon by a chemical vapor deposition method,
In the carbon nanotube electrode structure, the metal coating covers both the first main surface and the second main surface,
The dye-sensitized solar cell, wherein the metal catalyst is provided on one side of the first main surface and the second main surface.

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