JP2021039917A - Electrode plate - Google Patents
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- JP2021039917A JP2021039917A JP2019162118A JP2019162118A JP2021039917A JP 2021039917 A JP2021039917 A JP 2021039917A JP 2019162118 A JP2019162118 A JP 2019162118A JP 2019162118 A JP2019162118 A JP 2019162118A JP 2021039917 A JP2021039917 A JP 2021039917A
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- 239000011248 coating agent Substances 0.000 claims abstract description 74
- 238000000576 coating method Methods 0.000 claims abstract description 74
- 239000000758 substrate Substances 0.000 claims abstract description 38
- 238000001228 spectrum Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000005518 polymer electrolyte Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 57
- 230000007797 corrosion Effects 0.000 abstract description 57
- 239000010408 film Substances 0.000 description 70
- 238000012360 testing method Methods 0.000 description 42
- 239000010936 titanium Substances 0.000 description 25
- 238000010438 heat treatment Methods 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 20
- 238000000034 method Methods 0.000 description 17
- 239000010409 thin film Substances 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 239000011651 chromium Substances 0.000 description 9
- 229910001069 Ti alloy Inorganic materials 0.000 description 7
- 238000004544 sputter deposition Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000012528 membrane Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000005405 multipole Effects 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- -1 titanium alloy Chemical class 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
- Fuel Cell (AREA)
Abstract
Description
本発明は、電極板に関し、さらに詳しくは、固体高分子形燃料電池用セパレータ、固体高分子形(PEM)水電解装置用バイポーラプレートなどに用いられる電極板に関する。 The present invention relates to an electrode plate, and more particularly to an electrode plate used for a separator for a polymer electrolyte fuel cell, a bipolar plate for a polymer electrolyte (PEM) water electrolyzer, and the like.
固体高分子形燃料電池は、電解質膜の両面に触媒を含む電極(触媒層)が接合された膜電極接合体(Membrane Electrode Assembly,MEA)を備えている。MEAの両面には、さらに、ガス拡散層を含むガス流路を備えた集電体(セパレータともいう)が配置される。固体高分子形燃料電池は、通常、このようなMEAと集電体からなる単セルが複数個積層された構造(燃料電池スタック)を備えている。このような燃料電池のアノード及びカソードに、それぞれ、燃料ガス及び酸化剤ガスを供給すると、カソードにおいて水が生成すると同時に、電力を取り出すことができる。 The polymer electrolyte fuel cell includes a membrane electrode assembly (MEA) in which electrodes (catalyst layers) containing catalysts are bonded to both sides of an electrolyte membrane. Further, on both sides of the MEA, current collectors (also referred to as separators) having a gas flow path including a gas diffusion layer are arranged. The polymer electrolyte fuel cell usually has a structure (fuel cell stack) in which a plurality of single cells composed of such an MEA and a current collector are stacked. When fuel gas and oxidant gas are supplied to the anode and cathode of such a fuel cell, respectively, water can be generated at the cathode and electric power can be taken out at the same time.
一方、PEM水電解装置は、燃料電池とほぼ同様の構造を備えているが、燃料電池とは逆の反応を起こさせるものである。すなわち、酸素極に水を供給し、電極間に電力を供給すると、水の電気分解が進行し、水素及び酸素を取り出すことができる。 On the other hand, the PEM water electrolyzer has almost the same structure as the fuel cell, but causes a reaction opposite to that of the fuel cell. That is, when water is supplied to the oxygen electrode and electric power is supplied between the electrodes, the electrolysis of water proceeds and hydrogen and oxygen can be taken out.
なお、PEM水電解装置において、MEAの両面に配置される部材は、一般に、バイポーラプレート(複極板)と呼ばれている。一方、上述したように、固体高分子形燃料電池において、MEAの両面に配置される部材は、一般に、集電体、あるいは、セパレータと呼ばれている。
本発明において「電極板」という時は、これらの総称、すなわち、MEAの用途を問わず、MEAの両面に配置される拡散層等を含む導電性部材の総称を表す。
In the PEM water electrolyzer, the members arranged on both sides of the MEA are generally called a bipolar plate (multipole plate). On the other hand, as described above, in the polymer electrolyte fuel cell, the members arranged on both sides of the MEA are generally called a current collector or a separator.
In the present invention, the term "electrode plate" refers to all of these, that is, a general term for conductive members including diffusion layers and the like arranged on both sides of the MEA regardless of the use of the MEA.
固体高分子形燃料電池及びPEM水電解装置において、電解質膜には、通常、ポリパーフルオロカーボンスルホン酸膜が用いられている。そのため、電極板は、使用中に強酸性雰囲気に曝される。使用中に電極板の表面が酸化され、電極との接触面に高抵抗層が形成されると、電極反応又は電解反応が阻害される。 In a polymer electrolyte fuel cell and a PEM water electrolyzer, a polyperfluorocarbon sulfonic acid membrane is usually used as the electrolyte membrane. Therefore, the electrode plate is exposed to a strong acid atmosphere during use. If the surface of the electrode plate is oxidized during use and a high resistance layer is formed on the contact surface with the electrode, the electrode reaction or the electrolytic reaction is inhibited.
そこでこの問題を解決するために、従来から種々の提案がなされている。
例えば、特許文献1には、チタン合金板とステンレス鋼板の積層板からなる複極板を備えた水電解槽が開示されている。
同文献には、
(a)複極板としてチタン合金を用いる場合、陰極側を白金メッキして水素脆化を防止する必要があるが、白金メッキを施しても水素脆化を完全に防止できない点、及び、
(b)ステンレス鋼板が陰極側に来るように積層板を配置すると、チタン合金の水素脆化防止のために複極板の陰極側を白金メッキする必要がなくなる点、
が記載されている。
Therefore, in order to solve this problem, various proposals have been made conventionally.
For example,
In the same document,
(A) When a titanium alloy is used as the multi-pole plate, it is necessary to platinum-plat the cathode side to prevent hydrogen embrittlement, but hydrogen embrittlement cannot be completely prevented even with platinum plating, and
(B) If the laminated plate is arranged so that the stainless steel plate is on the cathode side, it is not necessary to platinum-plat the cathode side of the double electrode plate to prevent hydrogen embrittlement of the titanium alloy.
Is described.
従来、PEM水電解装置用バイポーラプレートとして、白金メッキしたチタン合金、チタン合金とステンレス鋼板の積層板などが提案されている。しかし、白金及びチタン合金はいずれも高価であるため、使用量を極力少なくするのが好ましい。また、メッキプロセスも高コストプロセスであるため、被覆膜の成膜には低コストプロセスを用いるのが好ましい。しかし、高価な材料の使用量が少なく、かつ、高コストなプロセスを用いることなく製造が可能な、電極板が提案された例は、従来にはない。 Conventionally, as a bipolar plate for a PEM water electrolyzer, a platinum-plated titanium alloy, a laminated plate of a titanium alloy and a stainless steel plate, and the like have been proposed. However, since both platinum and titanium alloys are expensive, it is preferable to use as little as possible. Further, since the plating process is also a high-cost process, it is preferable to use a low-cost process for forming the coating film. However, there has been no conventional example in which an electrode plate has been proposed, which uses a small amount of expensive materials and can be manufactured without using an expensive process.
本発明が解決しようとする課題は、耐食性及び導電性に優れ、しかも、低コストな電極板を提供することにある。 An object to be solved by the present invention is to provide an electrode plate having excellent corrosion resistance and conductivity and at low cost.
上記課題を解決するために本発明に係る電極板は、以下の構成を備えていることを要旨とする。
(1)前記電極板は、
基板と、
前記基板の表面の少なくとも一部に形成された被覆膜と
を備えている。
(2)前記被覆膜は、次の式(1)で表される組成を有するリン化物を含む。
M2-xTixP …(1)
但し、
Mは、Ni、Co、Fe、Mn、及びCrからなる群から選ばれるいずれか1以上の元素、
0.1≦x≦1.9
(3)前記被覆膜は、XRDスペクトル測定を行った時に、前記リン化物の最強線ピークの半値全幅が0.6°以下であるものからなる。
In order to solve the above problems, it is a gist that the electrode plate according to the present invention has the following configuration.
(1) The electrode plate is
With the board
It includes a coating film formed on at least a part of the surface of the substrate.
(2) The coating film contains a phosphide having a composition represented by the following formula (1).
M 2-x Ti x P ... (1)
However,
M is any one or more elements selected from the group consisting of Ni, Co, Fe, Mn, and Cr.
0.1 ≤ x ≤ 1.9
(3) The coating film comprises a coating film having a full width at half maximum of the strongest line peak of the phosphide of 0.6 ° or less when an XRD spectrum measurement is performed.
ある種のリン化物は、耐食性及び導電性に優れている。また、リン化物は、貴金属を含まないため、低コストである。さらに、リン化物からなる薄膜は、比較的低コストなスパッタ法により成膜することができる。そのため、リン化物からなる薄膜を電極板の被覆膜に適用すれば、耐食性及び導電性に優れ、しかも低コストな電極板を得ることができる。
さらに、一般に、成膜直後のリン化物薄膜は、結晶性が低い。これに対し、種々の方法により成膜されたリン化物薄膜を適切な条件下で熱処理すると、リン化物薄膜の結晶性が向上する。その結果、熱処理前に比べて導電性がさらに向上する。
Certain phosphides have excellent corrosion resistance and conductivity. Moreover, since the phosphide does not contain a precious metal, the cost is low. Further, the thin film made of a phosphide can be formed by a relatively low cost sputtering method. Therefore, if a thin film made of a phosphide is applied to the coating film of the electrode plate, an electrode plate having excellent corrosion resistance and conductivity and low cost can be obtained.
Further, in general, the phosphide thin film immediately after film formation has low crystallinity. On the other hand, when the phosphide thin film formed by various methods is heat-treated under appropriate conditions, the crystallinity of the phosphide thin film is improved. As a result, the conductivity is further improved as compared with that before the heat treatment.
以下、本発明の一実施の形態について詳細に説明する。
[1. 電極板]
本発明に係る電極板は、以下の構成を備えている。
(1)前記電極板は、
基板と、
前記基板の表面の少なくとも一部に形成された被覆膜と
を備えている。
(2)前記被覆膜は、次の式(1)で表される組成を有するリン化物を含む。
M2-xTixP …(1)
但し、
Mは、Ni、Co、Fe、Mn、及びCrからなる群から選ばれるいずれか1以上の元素、
0.1≦x≦1.9
(3)前記被覆膜は、XRDスペクトル測定を行った時に、前記リン化物の最強線ピークの半値全幅が0.6°以下であるものからなる。
Hereinafter, an embodiment of the present invention will be described in detail.
[1. Electrode plate]
The electrode plate according to the present invention has the following configurations.
(1) The electrode plate is
With the board
It includes a coating film formed on at least a part of the surface of the substrate.
(2) The coating film contains a phosphide having a composition represented by the following formula (1).
M 2-x Ti x P ... (1)
However,
M is any one or more elements selected from the group consisting of Ni, Co, Fe, Mn, and Cr.
0.1 ≤ x ≤ 1.9
(3) The coating film comprises a coating film having a full width at half maximum of the strongest line peak of the phosphide of 0.6 ° or less when an XRD spectrum measurement is performed.
[1.1. 基板]
基板の形状は、特に限定されるものではなく、目的に応じて最適な形状を選択することができる。電極板には、通常、発電用燃料、酸化剤、電解用原料、あるいは反応生成物を流通させるためのガス流路が設けられている。
[1.1. substrate]
The shape of the substrate is not particularly limited, and the optimum shape can be selected according to the purpose. The electrode plate is usually provided with a gas flow path for circulating a fuel for power generation, an oxidizing agent, a raw material for electrolysis, or a reaction product.
電極板は、MEAの電極と、負荷(燃料電池の場合)又は電源(水電解装置の場合)との間で電子の授受を行う必要がある。そのため、電極板には、一般にMEAの使用環境に耐える高い耐食性に加えて、高い導電性が求められる。
但し、本発明においては、被覆膜に高耐食性、かつ、高導電性のリン化物が用いられるため、基板は、少なくともMEAの使用環境に耐える耐食性を持つものであれば良く、必ずしも導電性材料である必要はない。
基板の材料としては、例えば、
(a)チタン合金、ステンレス鋼、アルミニウム、銅、ニッケル、モリブデン、クロムなどの金属、
(b)カーボン、
などがある。
The electrode plate needs to transfer electrons between the MEA electrode and a load (in the case of a fuel cell) or a power source (in the case of a water electrolyzer). Therefore, the electrode plate is generally required to have high conductivity in addition to high corrosion resistance that can withstand the usage environment of MEA.
However, in the present invention, since a phosphide having high corrosion resistance and high conductivity is used for the coating film, the substrate may be at least one having corrosion resistance to withstand the usage environment of MEA, and is not necessarily a conductive material. It doesn't have to be.
As the material of the substrate, for example,
(A) Metals such as titanium alloy, stainless steel, aluminum, copper, nickel, molybdenum, and chromium,
(B) Carbon,
and so on.
[1.2. 被覆膜]
[1.2.1. 材料]
被覆膜は、高耐食・高導電性のリン化物を含む。本発明において、「リン化物」とは、Ti、P、及び、Ti以外の金属元素Mを含む化合物であって、次の式(1)で表される組成を有するものをいう。
M2-xTixP …(1)
但し、
Mは、Ni、Co、Fe、Mn、及びCrからなる群から選ばれるいずれか1以上の元素、
0.1≦x≦1.9
[1.2. Coating film]
[1.2.1. material]
The coating film contains a highly corrosion-resistant and highly conductive phosphide. In the present invention, the "phosphide" refers to a compound containing Ti, P, and a metal element M other than Ti, and having a composition represented by the following formula (1).
M 2-x Ti x P ... (1)
However,
M is any one or more elements selected from the group consisting of Ni, Co, Fe, Mn, and Cr.
0.1 ≤ x ≤ 1.9
式(1)中、xは、金属元素の総原子数に対するTiの原子数の比を表す。xが小さすぎると、接触抵抗が増大する。従って、xは、0.1以上である必要がある。xは、好ましくは、0.2以上、さらに好ましくは、0.4以上である。
一方、xが大きくなりすぎると、かえって接触抵抗が増大する。従って、xは、1.9以下である必要がある。xは、好ましくは、1.8以下、さらに好ましくは、1.6以下である。
In the formula (1), x represents the ratio of the number of atoms of Ti to the total number of atoms of the metal element. If x is too small, the contact resistance will increase. Therefore, x needs to be 0.1 or more. x is preferably 0.2 or more, more preferably 0.4 or more.
On the other hand, if x becomes too large, the contact resistance will increase. Therefore, x needs to be 1.9 or less. x is preferably 1.8 or less, more preferably 1.6 or less.
所定の組成を有するリン化物は、いずれも、燃料電池環境下又は水電解装置環境下における耐食性が高く、かつ、導電性も高いので、電極板の被覆膜として好適である。被覆膜は、これらのいずれか1種のリン化物を含むものでも良く、あるいは、2種以上を含むものでも良い。
被覆膜を構成するリン化物は、特に、金属元素Mとして、Ni、Fe、及びMnからなる群から選ばれるいずれか1以上の元素を含むものが好ましい。これらのリン化物は、いずれも高い耐久性と、高い導電性とを併せ持つ。
All of the phosphides having a predetermined composition are suitable as a coating film for an electrode plate because they have high corrosion resistance and high conductivity in a fuel cell environment or a water electrolyzer environment. The coating film may contain any one of these phosphides, or may contain two or more of them.
The phosphide constituting the coating film preferably contains, as the metal element M, any one or more elements selected from the group consisting of Ni, Fe, and Mn. All of these phosphides have both high durability and high conductivity.
被覆膜は、実質的にリン化物のみからなるものが好ましいが、高耐食性及び高導電性を阻害しない限りにおいて、他の相が含まれていても良い。
他の相としては、例えば、
(a)不可避的不純物、
(b)リン化物以外の高耐食性物質、
などがある。
The coating film is preferably composed substantially only of a phosphide, but may contain other phases as long as it does not impair high corrosion resistance and high conductivity.
Other phases include, for example,
(A) Inevitable impurities,
(B) Highly corrosion-resistant substances other than phosphide,
and so on.
[1.2.2. 被覆膜の厚さ]
被覆膜の厚さは、特に限定されるものではなく、目的に応じて最適な厚さを選択することができる。一般に、被覆膜の厚さが薄くなりすぎると、十分な耐食性が得られない。従って、被覆膜の厚さは、0.01μm以上が好ましい。被覆膜の厚さは、好ましくは、0.05μm以上、さらに好ましくは、0.1μm以上である。
一方、被覆膜の厚さが厚くなりすぎると、基材との密着性が低下し、剥離や割れが生じるおそれがある。従って、被覆膜の厚さは、200μm以下が好ましい。被覆膜の厚さは、好ましくは、100μm以下、さらに好ましくは、80μm以下である。
[1.2.2. Coating film thickness]
The thickness of the coating film is not particularly limited, and the optimum thickness can be selected according to the purpose. Generally, if the thickness of the coating film becomes too thin, sufficient corrosion resistance cannot be obtained. Therefore, the thickness of the coating film is preferably 0.01 μm or more. The thickness of the coating film is preferably 0.05 μm or more, more preferably 0.1 μm or more.
On the other hand, if the thickness of the coating film is too thick, the adhesion to the base material is lowered, and peeling or cracking may occur. Therefore, the thickness of the coating film is preferably 200 μm or less. The thickness of the coating film is preferably 100 μm or less, more preferably 80 μm or less.
[1.2.3. 被覆膜の形成位置]
基板が導電性材料からなる場合、被覆膜は、基板の全面に形成されていても良く、あるいは、電極との接触面にのみ形成されていても良い。基板には、通常、ガス流路を形成するための凹凸が形成されており、電極板は凸部を介して電極と接触する。このような場合、電極との非接触面に高抵抗層が形成されたとしても電子の授受に支障はないので、少なくとも電極との接触面(凸部の先端面)に被覆膜を形成すれば良い。
一方、基板が導電性材料でない場合、電子の授受は被覆膜を介して行われる。このような場合には、被覆膜は、電極との接触面だけでなく、電極と負荷又は電源との間で電子の授受が可能となる位置に形成する必要がある。
[1.2.3. Coating film formation position]
When the substrate is made of a conductive material, the coating film may be formed on the entire surface of the substrate, or may be formed only on the contact surface with the electrode. The substrate is usually formed with irregularities for forming a gas flow path, and the electrode plate comes into contact with the electrodes via the convex portions. In such a case, even if a high resistance layer is formed on the non-contact surface with the electrode, there is no problem in transferring electrons. Therefore, at least a coating film should be formed on the contact surface with the electrode (the tip surface of the convex portion). Just do it.
On the other hand, when the substrate is not a conductive material, electrons are transferred through the coating film. In such a case, the coating film needs to be formed not only on the contact surface with the electrode but also at a position where electrons can be exchanged between the electrode and the load or the power source.
[1.2.4. 結晶性]
後述するように、本発明に係る電極板は、種々の方法を用いて基板表面に被覆膜を形成した後、熱処理することにより得られる。そのため、熱処理前に比べて結晶性が高い。
[12.4. crystalline]
As will be described later, the electrode plate according to the present invention can be obtained by forming a coating film on the substrate surface using various methods and then heat-treating it. Therefore, the crystallinity is higher than that before the heat treatment.
結晶性の程度は、XRDスペクトル測定を行った時に、リン化物の最強線ピークの半値全幅により評価することができる。具体的には、CuKα1X線(波長=1.5406Å)を用いてX線回折を行った場合、結晶性のリン化物のXRDスペクトルには、その組成によらず、2θが46°付近、51°付近、及び67°付近に、相対的に大きな回折ピークが現れる。これらの中の最強線ピークの半値全幅を測定することにより、結晶性の程度を知ることができる。製造条件を最適化すると、リン化物の最強線ピークの半値全幅は、0.6°以下、あるいは、0.4°以下となる。 The degree of crystallinity can be evaluated by the full width at half maximum of the strongest line peak of the phosphide when the XRD spectrum measurement is performed. Specifically, when X-ray diffraction is performed using CuK α1 X-ray (wavelength = 1.5406 Å), the XRD spectrum of the crystalline phosphide shows that 2θ is around 46 ° regardless of its composition. Relatively large diffraction peaks appear near 51 ° and around 67 °. By measuring the full width at half maximum of the strongest line peak among these, the degree of crystallinity can be known. When the production conditions are optimized, the full width at half maximum of the strongest line peak of the phosphide is 0.6 ° or less, or 0.4 ° or less.
[1.2.5. 接触抵抗]
本発明に係る被覆膜は、結晶性が高い。そのため、低結晶性のリン化物からなる被覆膜に比べて接触抵抗が低い。製造条件を最適化すると、被覆膜の接触抵抗は、10mΩcm2以下となる。製造条件をさらに最適化すると、接触抵抗は、8mΩcm2以下、あるいは、6mΩcm2以下となる。
[1.2.5. Contact resistance]
The coating film according to the present invention has high crystallinity. Therefore, the contact resistance is lower than that of a coating film made of a low crystalline phosphide. When the manufacturing conditions are optimized, the contact resistance of the coating film is 10 mΩcm 2 or less. If the manufacturing conditions are further optimized, the contact resistance becomes 8 mΩcm 2 or less, or 6 mΩ cm 2 or less.
[1.3. 用途]
本発明に係る電極板は、
(a)固体高分子形燃料電池用セパレータ、
(b)PEM水電解装置用バイポーラプレート、
などに用いることができる。
[1.3. Use]
The electrode plate according to the present invention is
(A) Separator for polymer electrolyte fuel cell,
(B) Bipolar plate for PEM water electrolyzer,
It can be used for such purposes.
[2. 電極板の製造方法]
電極板は、
(a)所定の形状を有する基板の表面に、所定のパターンで被覆膜を形成し、
(b)被覆膜が形成された基板を熱処理する
ことにより製造することができる。
[2. Electrode plate manufacturing method]
The electrode plate is
(A) A coating film is formed on the surface of a substrate having a predetermined shape in a predetermined pattern.
(B) It can be produced by heat-treating a substrate on which a coating film is formed.
[2.1. 被覆膜形成工程]
まず、所定の形状を有する基板の表面に、所定のパターンで被覆膜を形成する(被覆膜形成工程)。被覆膜の形成方法は、特に限定されるものではなく、目的に応じて最適な方法を選択することができる。
被覆膜の形成方法としては、例えば、スパッタリング法、蒸着法、めっき法、プラズマ法、CVD法などがある。これらの中でも、スパッタリング法は、他の方法と比べて低コストであり、大面積の成膜も容易であるので、被覆膜の形成方法として好適である。
[2.1. Coating film forming process]
First, a coating film is formed on the surface of a substrate having a predetermined shape in a predetermined pattern (coating film forming step). The method for forming the coating film is not particularly limited, and the optimum method can be selected according to the purpose.
Examples of the method for forming the coating film include a sputtering method, a vapor deposition method, a plating method, a plasma method, and a CVD method. Among these, the sputtering method is suitable as a coating film forming method because it has a lower cost than other methods and can easily form a large-area film.
[2.2. 熱処理工程]
次に、被覆膜が形成された基板を熱処理する(熱処理工程)。これにより、本発明に係る電極板が得られる。
[2.2. Heat treatment process]
Next, the substrate on which the coating film is formed is heat-treated (heat treatment step). As a result, the electrode plate according to the present invention can be obtained.
熱処理温度は、目的に応じて最適な条件を選択するのが好ましい。一般に、熱処理温度が低すぎると、高い結晶性を有する被覆膜は得られない。従って、熱処理温度は、500℃以上が好ましい。熱処理温度は、好ましくは、600℃以上、さらに好ましくは、650℃以上である。
一方、熱処理温度が高すぎると、基板がダメージを受け、強度が低下する場合がある。従って、熱処理温度は、800℃以下が好ましい。熱処理温度は、好ましくは、780℃以下、さらに好ましくは、740℃以下である。
It is preferable to select the optimum heat treatment temperature according to the purpose. Generally, if the heat treatment temperature is too low, a coating film having high crystallinity cannot be obtained. Therefore, the heat treatment temperature is preferably 500 ° C. or higher. The heat treatment temperature is preferably 600 ° C. or higher, more preferably 650 ° C. or higher.
On the other hand, if the heat treatment temperature is too high, the substrate may be damaged and the strength may decrease. Therefore, the heat treatment temperature is preferably 800 ° C. or lower. The heat treatment temperature is preferably 780 ° C. or lower, more preferably 740 ° C. or lower.
熱処理は、被覆膜の酸化を防ぐために、不活性雰囲気下において行うのが好ましい。
熱処理時間は、熱処理温度に応じて最適な時間を選択する。一般に、熱処理温度が高くなるほど、短時間で結晶化を進行させることができる。好適な熱処理時間は、熱処理温度にもよるが、通常、2時間〜10時間程度である。
The heat treatment is preferably performed in an inert atmosphere in order to prevent oxidation of the coating film.
The optimum heat treatment time is selected according to the heat treatment temperature. Generally, the higher the heat treatment temperature, the shorter the time required for crystallization to proceed. The suitable heat treatment time depends on the heat treatment temperature, but is usually about 2 hours to 10 hours.
[3. 作用]
ある種のリン化物は、耐食性及び導電性に優れている。また、リン化物は、貴金属を含まないため、低コストである。さらに、リン化物からなる薄膜は、比較的低コストなスパッタ法により成膜することができる。そのため、リン化物からなる薄膜を電極板の被覆膜に適用すれば、耐食性及び導電性に優れ、しかも低コストな電極板を得ることができる。
さらに、一般に、成膜直後のリン化物薄膜は、結晶性が低い。これに対し、種々の方法により成膜されたリン化物薄膜を適切な条件下で熱処理すると、リン化物薄膜の結晶性が向上する。その結果、熱処理前に比べて導電性がさらに向上する。
[3. Action]
Certain phosphides have excellent corrosion resistance and conductivity. Moreover, since the phosphide does not contain a precious metal, the cost is low. Further, the thin film made of a phosphide can be formed by a relatively low cost sputtering method. Therefore, if a thin film made of a phosphide is applied to the coating film of the electrode plate, an electrode plate having excellent corrosion resistance and conductivity and low cost can be obtained.
Further, in general, the phosphide thin film immediately after film formation has low crystallinity. On the other hand, when the phosphide thin film formed by various methods is heat-treated under appropriate conditions, the crystallinity of the phosphide thin film is improved. As a result, the conductivity is further improved as compared with that before the heat treatment.
(実施例1、比較例1)
[1. 試料の作製]
[1.1. 比較例1]
スパッタ法により、Ti基板(0.1×100×50mm、(株)ニラコ製)の表面にリン化物からなる被覆膜を成膜した。ターゲットには、NiTiPを用いた。スパッタ時の雰囲気は、Ar雰囲気とした。
(Example 1, Comparative Example 1)
[1. Preparation of sample]
[1.1. Comparative Example 1]
A coating film made of a phosphide was formed on the surface of a Ti substrate (0.1 × 100 × 50 mm, manufactured by Nirako Co., Ltd.) by a sputtering method. NiTiP was used as the target. The atmosphere at the time of sputtering was an Ar atmosphere.
[1.2. 実施例1]
比較例1と同様にして、NiTiP薄膜を成膜した。その後、Ar雰囲気中で700℃で5時間熱処理した。
[1.2. Example 1]
A NiTiP thin film was formed in the same manner as in Comparative Example 1. Then, it was heat-treated at 700 ° C. for 5 hours in an Ar atmosphere.
[2. 試験方法]
[2.1. 耐食試験]
[2.1.1. 電圧印加]
NiTiP薄膜が形成されたTi基板を切断し、1cm×4cmの試料を得た。1Lのセパラブルフラスコに0.01N硫酸を800mL入れた。これをマントルヒーターにセットし、80℃まで加熱した。80℃に保たれた硫酸に試料を浸漬し、試料に2.0Vの電圧を6時間印加した。
[2. Test method]
[2.1. Corrosion resistance test]
[2.1.1. Voltage application]
The Ti substrate on which the NiTiP thin film was formed was cut to obtain a 1 cm × 4 cm sample. 800 mL of 0.01N sulfuric acid was placed in a 1 L separable flask. This was set in a mantle heater and heated to 80 ° C. The sample was immersed in sulfuric acid maintained at 80 ° C., and a voltage of 2.0 V was applied to the sample for 6 hours.
[2.1.2. 抵抗測定]
電圧印加前後の抵抗変化を測定するために、ロードセルで試料に1MPa加圧した。この状態で試料面に垂直方向に0〜0.5Aの電流を流し、その時の電圧値を測定した。さらに、電圧値から接触抵抗を算出した。
[2.1.2. Resistance measurement]
In order to measure the resistance change before and after applying the voltage, the sample was pressurized by 1 MPa with a load cell. In this state, a current of 0 to 0.5 A was passed in the direction perpendicular to the sample surface, and the voltage value at that time was measured. Furthermore, the contact resistance was calculated from the voltage value.
[2.3. XRDスペクトルの測定]
NiTiP薄膜が形成されたTi基板について、XRDスペクトルを測定した。得られたXRDスペクトルから、最強線ピークの半値全幅を求めた。
[2.3. XRD spectrum measurement]
The XRD spectrum of the Ti substrate on which the NiTiP thin film was formed was measured. From the obtained XRD spectrum, the full width at half maximum of the strongest line peak was obtained.
[3. 結果]
[3.1. 耐食試験]
比較例1の場合、耐食試験前(電圧印加前)の接触抵抗は15mΩcm2であったのに対し、耐食試験後(電圧印加後)の接触抵抗は28mΩcm2であった。
一方、実施例1の場合、耐食試験前(電圧印加前)の接触抵抗、及び、耐食試験後(電圧印加後)の接触抵抗は、いずれも、5mΩcm2であった。
[3. result]
[3.1. Corrosion resistance test]
In the case of Comparative Example 1, the contact resistance before the corrosion resistance test (before applying the voltage) was 15 mΩcm 2 , whereas the contact resistance after the corrosion resistance test (after applying the voltage) was 28 mΩcm 2 .
On the other hand, in the case of Example 1, the contact resistance before the corrosion resistance test (before applying the voltage) and the contact resistance after the corrosion resistance test (after applying the voltage) were both 5 mΩcm 2 .
[3.2. XRDスペクトル]
図1に、熱処理前(比較例1)及び熱処理後(実施例1)の被覆膜の耐食試験前及び耐食試験後のXRDスペクトルを示す。比較例1の場合、NiTiPに由来する回折ピークが認められなかった。一方、実施例1の場合、2θが46°付近、51°付近、及び67°付近に、明瞭な回折ピークが認められた。また、電圧印加前後でXRDスペクトルの著しい変化はなく、NiTiP薄膜が耐食性に優れていることが分かった。実施例1の場合、耐食試験前の最強線ピークの半値全幅は、0.35°であった。
[3.2. XRD spectrum]
FIG. 1 shows the XRD spectra of the coating film before the heat treatment (Comparative Example 1) and after the heat treatment (Example 1) before and after the corrosion resistance test. In the case of Comparative Example 1, no diffraction peak derived from NiTiP was observed. On the other hand, in the case of Example 1, clear diffraction peaks were observed in the vicinity of 2θ of 46 °, 51 °, and 67 °. In addition, there was no significant change in the XRD spectrum before and after the voltage was applied, indicating that the NiTiP thin film has excellent corrosion resistance. In the case of Example 1, the full width at half maximum of the strongest line peak before the corrosion resistance test was 0.35 °.
(実施例2〜5)
[1. 試料の作製]
ターゲットとして、CoTiP(実施例2)、FeTiP(実施例3)、MnTiP(実施例4)、又はCrTiP(実施例5)を用いた以外は、実施例1と同様にして、被覆膜の成膜及び熱処理を行った。
[2. 試験方法]
実施例1と同様にして耐食試験を行い、耐食試験後の接触抵抗、及び、耐食試験前の最強線ピークの半値全幅を測定した。
(Examples 2 to 5)
[1. Preparation of sample]
A coating film was formed in the same manner as in Example 1 except that CoTiP (Example 2), FeTiP (Example 3), MnTiP (Example 4), or CrTiP (Example 5) was used as the target. The membrane and heat treatment were performed.
[2. Test method]
A corrosion resistance test was carried out in the same manner as in Example 1, and the contact resistance after the corrosion resistance test and the full width at half maximum of the strongest line peak before the corrosion resistance test were measured.
[3. 結果]
図2に、耐食試験後の接触抵抗を示す。また、表1に、耐食試験後の接触抵抗、及び、最強線ピークの半値全幅を示す。なお、図1及び表1には、実施例1(NiTiP)の結果も併せて示した。
[3. result]
FIG. 2 shows the contact resistance after the corrosion resistance test. Table 1 shows the contact resistance after the corrosion resistance test and the full width at half maximum of the strongest line peak. The results of Example 1 (NiTiP) are also shown in FIGS. 1 and 1.
CoTiP(実施例2)、FeTiP(実施例3)、MnTiP(実施例4)、及び、CrTiP(実施例5)の接触抵抗は、いずれも10mΩcm2以下であり、良好な導電性を示すことが分かった。
また、CoTiP(実施例2)、FeTiP(実施例3)、MnTiP(実施例4)、及び、CrTiP(実施例5)の耐食試験前の最強線ピークの半値全幅は、いずれも0.60°以下であり、高い結晶性を示すことが分かった。
The contact resistance of CoTiP (Example 2), FeTiP (Example 3), MnTiP (Example 4), and CrTiP (Example 5) is 10 mΩcm 2 or less, and it can show good conductivity. Do you get it.
Further, the full width at half maximum of the strongest line peak before the corrosion resistance test of CoTiP (Example 2), FeTiP (Example 3), MnTiP (Example 4), and CrTiP (Example 5) is 0.60 °. It was found that the following was high crystallinity.
(実施例6〜9)
[1. 試料の作製]
ターゲットとして、Ni0.5Co0.5TiP(実施例6)、Co0.5Fe0.5TiP(実施例7)、Fe0.5Mn0.5TiP(実施例8)、又はMn0.5Cr0.5TiP(実施例9)を用いた以外は、実施例1と同様にして、被覆膜の成膜及び熱処理を行った。
[2. 試験方法]
実施例1と同様にして耐食試験を行い、耐食試験後の接触抵抗、及び、耐食試験前の最強線ピークの半値全幅を測定した。
(Examples 6 to 9)
[1. Preparation of sample]
As a target, Ni 0.5 Co 0.5 Tip (Example 6), Co 0.5 Fe 0.5 Tip (Example 7), Fe 0.5 Mn 0.5 Tip (Example 8), or Mn 0.5 Cr 0.5 Tip (Example 9) was used. Except for the above, the coating film was formed and heat-treated in the same manner as in Example 1.
[2. Test method]
A corrosion resistance test was carried out in the same manner as in Example 1, and the contact resistance after the corrosion resistance test and the full width at half maximum of the strongest line peak before the corrosion resistance test were measured.
[3. 結果]
図3に、Ti基板の表面にNi1-yCoyTiP(0≦y≦1)からなる被覆膜が形成された試料の耐食試験後の接触抵抗を示す。図4に、Ti基板の表面にCo1-yFeyTiP(0≦y≦1)からなる被覆膜が形成された試料の耐食試験後の接触抵抗を示す。図5に、Ti基板の表面にFe1-yMnyTiP(0≦y≦1)からなる被覆膜が形成された試料の耐食試験後の接触抵抗を示す。図6に、Ti基板の表面にMn1-yCryTiP(0≦y≦1)からなる被覆膜が形成された試料の耐食試験後の接触抵抗を示す。なお、図3〜6には、端成分(実施例1〜5)の結果も併せて示した。
また、表2に、耐食試験後の接触抵抗、及び、耐食試験前の最強線ピークの半値全幅を示す。
[3. result]
Figure 3 shows the contact resistance after the corrosion test of the sample coating film made of Ni 1-y Co y TiP on the surface of the Ti substrate (0 ≦ y ≦ 1) is formed. Figure 4 shows the contact resistance after the corrosion test of the sample coating film made of a Co 1-y Fe y TiP ( 0 ≦ y ≦ 1) on the surface of the Ti substrate is formed. FIG. 5 shows the contact resistance of a sample in which a coating film made of Fe 1-y Mn y TiP (0 ≦ y ≦ 1) is formed on the surface of a Ti substrate after a corrosion resistance test. Figure 6 shows the contact resistance after the corrosion test of the sample coating film made of a Mn 1-y Cr y TiP on the surface of the Ti substrate (0 ≦ y ≦ 1) is formed. The results of the endmembers (Examples 1 to 5) are also shown in FIGS. 3 to 6.
Table 2 shows the contact resistance after the corrosion resistance test and the full width at half maximum of the strongest peak before the corrosion resistance test.
2種類の金属元素Mを含む被覆膜の接触抵抗は、いずれも、端成分のほぼ中間の値を示した。また、Ni0.5Co0.5TiP(実施例6)、Co0.5Fe0.5TiP(実施例7)、Fe0.5Mn0.5TiP(実施例8)、及び、Mn0.5Cr0.5TiP(実施例9)の接触抵抗は、いずれも10mΩcm2以下であり、良好な導電性を示すことが分かった。
また、Ni0.5Co0.5TiP(実施例6)、Co0.5Fe0.5TiP(実施例7)、Fe0.5Mn0.5TiP(実施例8)、及び、Mn0.5Cr0.5TiP(実施例9)の耐食試験前の最強線ピークの半値全幅は、いずれも0.60°以下であり、高い結晶性を示すことが分かった。
The contact resistance of the coating film containing the two types of metal elements M showed a value approximately intermediate between the end components. The contact resistance of Ni 0.5 Co 0.5 Tip (Example 6), Co 0.5 Fe 0.5 Tip (Example 7), Fe 0.5 Mn 0.5 Tip (Example 8), and Mn 0.5 Cr 0.5 Tip (Example 9). It was found that all of them were 10 mΩcm 2 or less and showed good conductivity.
Corrosion resistance tests of Ni 0.5 Co 0.5 Tip (Example 6), Co 0.5 Fe 0.5 Tip (Example 7), Fe 0.5 Mn 0.5 Tip (Example 8), and Mn 0.5 Cr 0.5 Tip (Example 9). The full width at half maximum of the previous strongest line peaks was 0.60 ° or less, and it was found that they showed high crystallinity.
(比較例1〜6)
[1. 試料の作製]
ターゲットとして、NiP(比較例1)、CoP(比較例2)、FeP(比較例3)、MnP(比較例4)、CrP(比較例5)、又はTiP(比較例6)を用いた以外は、実施例1と同様にして、被覆膜の成膜及び熱処理を行った。
[2. 試験方法]
実施例1と同様にして耐食試験を行い、耐食試験後の接触抵抗、及び、耐食試験前の最強線ピークの半値全幅を測定した。
(Comparative Examples 1 to 6)
[1. Preparation of sample]
Except for using NiP (Comparative Example 1), CoP (Comparative Example 2), FeP (Comparative Example 3), MnP (Comparative Example 4), CrP (Comparative Example 5), or TiP (Comparative Example 6) as targets. , The coating film was formed and heat-treated in the same manner as in Example 1.
[2. Test method]
A corrosion resistance test was carried out in the same manner as in Example 1, and the contact resistance after the corrosion resistance test and the full width at half maximum of the strongest line peak before the corrosion resistance test were measured.
[3. 結果]
図7〜図11に、Ti基板の表面に、NiP、CoP、FeP、MnP、CrP、又はTiPからなる被膜が形成された試料の耐食試験後の接触抵抗を示す。図7〜図11には、NiTiP、CoTiP、FeTiP、MnTiP、及びCrTiPの結果も併せて示した。また、表3に、耐食試験後の接触抵抗、及び、耐食試験前の最強線ピークの半値全幅を示す。
[3. result]
7 to 11 show the contact resistance of a sample having a coating film made of NiP, CoP, FeP, MnP, CrP, or TiP formed on the surface of the Ti substrate after the corrosion resistance test. 7 to 11 also show the results of NiTiP, CoTiP, FeTiP, MnTiP, and CrTiP. Table 3 shows the contact resistance after the corrosion resistance test and the full width at half maximum of the strongest peak before the corrosion resistance test.
図7〜図11より、Ti及び金属元素Mを含むリン化物の接触抵抗は、1種類の金属元素を含むリン化物のそれより小さいことが分かる。
NiP(比較例1)、CoP(比較例2)、FeP(比較例3)、MnP(比較例4)、CrP(比較例5)、及び、TiP(比較例6)の耐食試験前の最強線ピークの半値全幅は、いずれも0.6°以下であった。しかしながら、これらの接触抵抗は、いずれも10mΩcm2を超えていた。
From FIGS. 7 to 11, it can be seen that the contact resistance of the phosphide containing Ti and the metal element M is smaller than that of the phosphide containing one kind of metal element.
The strongest line of NiP (Comparative Example 1), CoP (Comparative Example 2), FeP (Comparative Example 3), MnP (Comparative Example 4), CrP (Comparative Example 5), and TiP (Comparative Example 6) before the corrosion resistance test. The full width at half maximum of the peak was 0.6 ° or less. However, all of these contact resistances exceeded 10 mΩcm 2.
以上、本発明の実施の形態について詳細に説明したが、本発明は上記実施の形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内で種々の改変が可能である。 Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.
本発明に係る電極板は、固体高分子形燃料電池用セパレータ、固体高分子形(PEM)水電解装置用バイポーラプレートなどに使用することができる。 The electrode plate according to the present invention can be used for a separator for a polymer electrolyte fuel cell, a bipolar plate for a polymer electrolyte (PEM) water electrolyzer, and the like.
Claims (8)
(1)前記電極板は、
基板と、
前記基板の表面の少なくとも一部に形成された被覆膜と
を備えている。
(2)前記被覆膜は、次の式(1)で表される組成を有するリン化物を含む。
M2-xTixP …(1)
但し、
Mは、Ni、Co、Fe、Mn、及びCrからなる群から選ばれるいずれか1以上の元素、
0.1≦x≦1.9
(3)前記被覆膜は、XRDスペクトル測定を行った時に、前記リン化物の最強線ピークの半値全幅が0.6°以下であるものからなる。 An electrode plate having the following configuration.
(1) The electrode plate is
With the board
It includes a coating film formed on at least a part of the surface of the substrate.
(2) The coating film contains a phosphide having a composition represented by the following formula (1).
M 2-x Ti x P ... (1)
However,
M is any one or more elements selected from the group consisting of Ni, Co, Fe, Mn, and Cr.
0.1 ≤ x ≤ 1.9
(3) The coating film comprises a coating film having a full width at half maximum of the strongest line peak of the phosphide of 0.6 ° or less when an XRD spectrum measurement is performed.
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JP2011009124A (en) * | 2009-06-26 | 2011-01-13 | Toyota Central R&D Labs Inc | Conductive film, conductive material and its manufacturing method, solid polymer fuel cell, its separator, conductive powder, and its manufacturing method |
JP2014082176A (en) * | 2012-10-18 | 2014-05-08 | Toyota Central R&D Labs Inc | Corrosion resistant electroconductive material, corrosion resistant electroconductive film and corrosion resistant electroconductive member |
JP2014080668A (en) * | 2012-10-18 | 2014-05-08 | Toyota Central R&D Labs Inc | Insoluble electrode material and insoluble electrode |
JP2015132006A (en) * | 2014-01-15 | 2015-07-23 | 株式会社豊田中央研究所 | crystalline electrode material and insoluble electrode |
JP2019197667A (en) * | 2018-05-10 | 2019-11-14 | 株式会社豊田中央研究所 | Bipolar plate |
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JPH08260178A (en) * | 1995-03-23 | 1996-10-08 | Chikyu Kankyo Sangyo Gijutsu Kenkyu Kiko | Water electrolytic cell using solid high molecular electrolyte membrane |
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