CN118147675A - Bipolar plate for PEM water electrolyzer - Google Patents
Bipolar plate for PEM water electrolyzer Download PDFInfo
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- CN118147675A CN118147675A CN202410197365.1A CN202410197365A CN118147675A CN 118147675 A CN118147675 A CN 118147675A CN 202410197365 A CN202410197365 A CN 202410197365A CN 118147675 A CN118147675 A CN 118147675A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000576 coating method Methods 0.000 claims abstract description 79
- 239000011248 coating agent Substances 0.000 claims abstract description 76
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 51
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 39
- 239000010935 stainless steel Substances 0.000 claims abstract description 39
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 239000004809 Teflon Substances 0.000 claims abstract description 14
- 229920006362 Teflon® Polymers 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 238000007747 plating Methods 0.000 claims abstract description 11
- 238000005192 partition Methods 0.000 claims abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 21
- 239000010936 titanium Substances 0.000 claims description 18
- 229910052719 titanium Inorganic materials 0.000 claims description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 11
- 239000010955 niobium Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- -1 polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer Polymers 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 5
- 229910052697 platinum Inorganic materials 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- 239000004812 Fluorinated ethylene propylene Substances 0.000 claims description 3
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 3
- 229920009441 perflouroethylene propylene Polymers 0.000 claims description 3
- 229910052707 ruthenium Inorganic materials 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 239000010963 304 stainless steel Substances 0.000 claims description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 claims description 2
- 238000005868 electrolysis reaction Methods 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 9
- 239000003566 sealing material Substances 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000000638 solvent extraction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 38
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 12
- 239000001257 hydrogen Substances 0.000 description 12
- 229910052739 hydrogen Inorganic materials 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
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- 239000011247 coating layer Substances 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 229910000619 316 stainless steel Inorganic materials 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 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
- 238000005516 engineering process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
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- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
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- 231100000614 poison Toxicity 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/02—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form
- C25B11/036—Bipolar electrodes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
- C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
-
- 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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a bipolar plate for a PEM water electrolysis cell, which is characterized in that a stainless steel bipolar plate is partitioned: a first contact region contacting the core member, a second contact region contacting the wire harness, and a region other than the first contact region and the second contact region being a non-contact region; carrying out partition plating treatment on the stainless steel bipolar plate: carrying out low-load noble metal coating treatment on the first contact area and the second contact area, and carrying out Teflon insulating coating treatment on the non-contact area; the low-load noble metal coating is a mixed coating or a double-layer coating of noble metal and non-noble metal. According to the invention, the surface structure of the metal bipolar plate is reasonably remolded, the bipolar plate substrate is treated in a partitioning way, the area of a metal coating is reduced, and the material cost is effectively reduced; the bipolar plate material and the sealing material are integrated, so that the assembly process is simplified, the service life of the electrolytic cell is prolonged, and the cost advantage is realized.
Description
Technical Field
The invention belongs to the technical field of hydrogen production by PEM water electrolysis, and particularly relates to a bipolar plate for a PEM water electrolysis tank.
Background
As environmental protection is increasingly emphasized by the whole society, the use of hydrogen energy is also receiving attention. The water electrolysis hydrogen production technology is favored because hydrogen can be safely and efficiently obtained. The proton exchange membrane electrolyzed water (PEM electrolyzed water) is a green hydrogen production mode which is rapidly developed in recent years, and has the advantages of high current density, high working efficiency, high hydrogen purity and the like. With the gradual increase of the hydrogen production capacity of the PEM by electrolysis of water, the technical requirement on the hydrogen production of the PEM by electrolysis of water is also higher.
The main equipment for producing hydrogen by water electrolysis is a water electrolysis tank, water is electrolyzed into hydrogen and oxygen by electric energy, and outlets of the hydrogen and the oxygen are respectively positioned at two sides of the bipolar plate. The bipolar plate is a core component of the water electrolysis cell, occupies most of the weight and cost of the battery pack, and has the characteristics of good electric conductivity, heat conductivity, corrosion resistance, high mechanical strength, gas permeation resistance and the like, so that the performance of the whole electrolysis cell is directly affected. Currently, bipolar plates for PEM water electrolysers are mainly of three different types of construction: flat metal bipolar plates with metal stretch/stamping mesh, thick metal bipolar plates with etched flow channels, and thin metal bipolar plates formed by direct stamping. In general, the three bipolar plates and the sealing/insulating material are independent of each other, the metal bipolar plate material and the sealing/insulating material are bonded by assembling force, the requirement on the flatness of the bipolar plates is high, and the assembling process is complex.
The bipolar plate of the water electrolysis cell is made of metal, and the metal material has good toughness, and good machining performance, electrical conductivity, thermal conductivity and compactness. However, the bipolar plate is extremely easy to corrode in a high-potential and acidic temperature and humidity environment of the electrolytic cell, and dissolved metal ions such as iron, chromium, manganese and the like can poison a Catalyst Coated Membrane (CCM), so that the activity of the catalyst is reduced, the ionic conductivity of a proton membrane is reduced, and the performance of the water electrolytic cell is reduced.
Titanium materials are often used as PEM water electrolyser metal bipolar plate materials due to their excellent corrosion resistance at strong acidity and high anodic potentials, as well as low initial contact resistance. However, in the environment of the electrolytic tank, the surface of the titanium material is easy to be passivated, so that the surface resistance of the titanium material is increased, the loss of the electrolytic tank is increased, and the performance is reduced, therefore, the platinum noble metal coating is still coated on the surface of the titanium bipolar plate generally, so that the ohmic loss is reduced, and the long-term stable operation of the electrolytic tank is maintained, which undoubtedly aggravates the overall manufacturing cost of the electrolytic tank.
Stainless steel plates are inexpensive and many researchers have changed to stainless steel to make bipolar plates. However, stainless steel is easy to corrode in a water electrolysis environment, and under the condition of no treatment, the environment requirement of water electrolysis operation is difficult to be met, so that additional surface modification treatment is required to be carried out on the stainless steel plate, and a metal layer is usually coated on the surface of the bipolar plate, and the metal layer has good electric conduction, heat conduction and corrosion resistance and long-term chemical stability under the service condition of an electrolytic tank.
Platinum group noble metal coatings are the preferred materials for metal bipolar plate coatings due to their excellent chemical inertness and good thermal and electrical conductivity. For example, patent document CN115786955A uses a stainless steel plate as a substrate for a PEM water electrolysis bipolar plate, and a microporous titanium layer and a functional coating are sequentially arranged on the front surface and the back surface of the stainless steel plate, wherein the aperture of the microporous titanium layer is 100nm-10 μm; the microporous titanium layer contains spherical dehydrogenated titanium powder; the functional coating for forming the anode flow field comprises spherical atomized titanium powder with the particle size of 20-50 mu m, and the functional coating for forming the cathode flow field comprises spherical atomized titanium powder with the particle size of 50-100 mu m and a pore-forming agent. Patent document CN115786956a uses a stainless steel plate as a PEM water electrolysis bipolar plate of a substrate, a butt-penetrating strip-shaped hole structure which corresponds to the back position of a runner and is parallel to the back position is arranged on the substrate, mixed titanium layers are arranged on the upper surface and the lower surface of the substrate, the butt-penetrating strip-shaped hole structure is filled with the mixed titanium layers, the upper mixed titanium layer and the lower mixed titanium layer are connected, a spherical dehydrogenation titanium powder layer and a functional coating are sequentially arranged on the surface of the mixed titanium layer, and spherical atomized titanium powder is contained in the mixed titanium layer and the functional coating. However, the noble metal coating of the above documents is too costly and reduces the market competitive advantage of stainless steel bipolar plates.
There is also a literature to reduce the coating area of expensive metals as much as possible without losing the electrolytic performance of the cell, in order to reduce the overall manufacturing costs of the cell. For example: the bipolar plate of patent document CN115149021a comprises a layered composite strip formed into a ridge-groove flow field structure and a coating layer provided on the surface of the layered composite strip; the layered composite strip comprises a substrate layer and a coating layer arranged on the surface of the substrate layer, wherein the surface side of the coating layer is a flow field area, and the coating layer is arranged on the surface of the coating layer; the substrate layer comprises at least one of an SS layer, an Al layer, a Cu layer and a Ni layer, and the SS is stainless steel; the cladding material layer comprises at least one of a Ti layer, a Zr layer, a Ta layer and a Nb layer; the coating includes a transition metal nitride layer, a transition metal carbide layer, a transition metal nitrogen carbide layer, or a carbon-based coating. Patent document CN117165940a discloses a stainless steel bipolar plate, which mechanically polishes and ultrasonically cleans the surface of a stainless steel material; nickel plating treatment is carried out on the stainless steel material; and (3) in-situ growing graphene on the surface of the nickel-plated stainless steel by utilizing a chemical vapor deposition technology. Patent document CN114875464a discloses an anode bipolar plate of a PEM electrolyzer, wherein a Ni and Ni-Cr composite layer is electroplated on the surface of a stainless steel substrate, then a slurry composed of conductive carbon black and epoxy resin is hung, and then a gradient coating is formed by solidification, carbonization and alloying. However, the above-mentioned documents have problems such as high cost, complicated assembly process, and ion pollution.
Disclosure of Invention
The invention aims to provide a bipolar plate for a PEM water electrolysis cell, which solves the problems of high cost, complex assembly process and ion pollution in the prior art.
The aim of the invention is achieved by the following technical scheme:
The bipolar plate for the PEM water electrolysis tank is characterized in that a stainless steel bipolar plate is partitioned: a first contact region contacting the core member, a second contact region contacting the wire harness, and a region other than the first contact region and the second contact region being a non-contact region; carrying out partition plating treatment on the stainless steel bipolar plate: carrying out low-load noble metal coating treatment on the first contact area and the second contact area, and carrying out Teflon insulating coating treatment on the non-contact area; the low-load noble metal coating is a mixed coating or a double-layer coating of noble metal and non-noble metal;
The mass fraction of noble metal in the mixed coating is 8% -15%; the thickness of the mixed coating is 3-5.5 mu m; the non-noble metal in the mixed coating is one of titanium, zirconium, chromium, niobium and tantalum, and the noble metal is one of platinum, gold, ruthenium and iridium.
The double-layer coating is formed by coating a layer of non-noble metal coating on a stainless steel bipolar plate substrate and then coating a layer of noble metal coating; the thickness of the non-noble metal coating in the double-layer coating is 2.9-5.0 mu m, the thickness of the noble metal coating is 0.02-0.1 mu m, the non-noble metal is one of titanium, zirconium, chromium, niobium and tantalum, and the noble metal is one of platinum, gold, ruthenium and iridium.
Further, the stainless steel bipolar plate is one of a stainless steel flat plate with a metal stretching or/and stamping net, a stainless steel flow field thick plate with an etching runner and a stamped stainless steel stamping thin plate.
Further, the stainless steel bipolar plate is made of one of 304 stainless steel, 316 stainless steel and 316L stainless steel, and has a thickness of 0.5-2 mm.
Further, the total thickness of the low-load noble metal plating layer of the first contact region or the second contact region is 3-5.5 μm.
Further, the thickness of the Teflon insulating coating is 0.05-0.30 mm, preferably 0.08-0.15 mm.
Further, the Teflon insulating coating is made of one of Polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), fluorinated ethylene propylene copolymer (FEP) and soluble Polytetrafluoroethylene (PFA).
In the invention, if only the first contact area and the second contact area are coated with a low-load noble metal coating, and the non-contact area is not coated with a Teflon insulating coating, under the actual operation condition of the electrolytic tank, the non-contact area is still partially affected by invasion of corrosive liquid and high current, thereby causing precipitation of metal ions, and the surface resistance of a local area is increased, so that local overheating is caused. The existing bipolar plate material and sealing/insulating material are mutually independent, the metal bipolar plate material and sealing/insulating material are bonded through assembly force, the requirement on the flatness of the bipolar plate is high, and the assembly process is complex. According to the invention, the non-contact area is creatively coated with the Teflon coating with insulating and sealing properties, and the Teflon coating not only has insulating, high temperature resistant and corrosion resistant properties, but also has lower friction coefficient and self-cleaning capability, and also has sealing property, so that the bipolar plate material and the sealing material are integrated, the assembly process can be simplified, the manufacturing cost can be effectively reduced, the precipitation amount of metal impurity ions can be reduced, and the service life of the electrolytic tank can be prolonged.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, the surface structure of the metal bipolar plate is rationally remolded, the low-load noble metal plating treatment is carried out in the first contact area contacted with the groove core part and the second contact area connected with the wire harness, so that the contact resistance between the bipolar plate and the groove core part is reduced, the conductive corrosion resistance is improved, and the material cost is effectively reduced; sealing/insulating coating treatment is carried out on the rest non-contact areas, so that the area of the metal coating is reduced; the bipolar plate material and the sealing material are integrated, so that the assembly process is simplified, the service life of the electrolytic cell is prolonged, and the cost advantage is realized.
Drawings
Fig. 1 is a schematic structural view of a bipolar plate for a PEM water electrolyser of the present invention.
Fig. 2 is a schematic illustration of a mixed coating of noble and non-noble metals.
Fig. 3 is a schematic illustration of a two-layer coating of noble metal and non-noble metal.
Detailed Description
It will be appreciated by those skilled in the art that the present examples are provided for illustration only and are not intended to be limiting.
Example 1
As shown in fig. 1 and 2, a 316L stainless steel bipolar plate (thickness 0.8 mm) with a metal stamping mesh (not shown in the metal stamping mesh) was partitioned: a first contact region 01 contacting the core member, a second contact region 02 contacting the wire harness, and a non-contact region 03 other than the first contact region and the second contact region; in addition, the bipolar plate is provided with a common runner port with a through hole structure, namely an anode water common runner 101, an anode water/gas common runner 102, a cathode gas common runner 201 and a cathode gas common runner 202.
Carrying out partition plating treatment on the stainless steel bipolar plate: carrying out low-load noble metal coating treatment on the first contact area 01 and the second contact area 02, and carrying out Teflon insulating coating treatment on the non-contact area 03; the low-load noble metal coating is a mixed coating of noble metal and non-noble metal, the thickness of the mixed coating is 4.5 mu m, wherein the mass fraction of noble metal Au is 10%, and the mass fraction of non-noble metal Ti is 90%; the Teflon insulating coating is made of Polytetrafluoroethylene (PTFE) and has the thickness of 0.15mm.
Example 2
As shown in fig. 1 and 3, a stamped 316L stainless steel stamped bipolar plate (thickness 0.5 mm) was partitioned: a first contact region 01 contacting the core member, a second contact region 02 contacting the wire harness, and a non-contact region 03 other than the first contact region and the second contact region; in addition, a public runner port with a through hole structure is reserved on the bipolar plate, and the public runner ports are respectively an anode water public runner 101, an anode water/gas public runner 102, a cathode gas public runner 201 and a cathode gas public runner 202;
Carrying out partition plating treatment on the stainless steel bipolar plate: carrying out low-load noble metal coating treatment on the first contact area 01 and the second contact area 02, and carrying out Teflon insulating coating treatment on the non-contact area 03; the low-load noble metal plating layer is a noble metal and non-noble metal double-layer coating (the total thickness is 3.05 mu m), wherein the double-layer coating is formed by firstly coating a non-noble metal niobium coating with the thickness of 3.0 mu m on a stainless steel bipolar plate substrate, and then coating a noble metal platinum coating with the thickness of 0.05 mu m on the niobium coating; the Teflon insulating coating is made of ethylene-tetrafluoroethylene copolymer (ETFE) and has the thickness of 0.10mm.
The bipolar plates for the PEM water electrolysers of examples 1 and 2 were tested for performance according to GB/T20042.6-2011 section 6 of proton exchange membrane fuel cell: the method comprises the steps of measuring contact resistance and corrosion current density according to a standard of a bipolar plate characteristic test method, measuring metal ion precipitation per unit area after constant potential corrosion according to a standard of an ISO 11885:2007 water quality inductively coupled plasma mass spectrometry method, and measuring binding force of a conductive metal coating according to a standard of a GB/T9286-2021 cross-cut test of colored paint and varnish; the results of the performance tests are shown in Table 1.
TABLE 1 results of Performance test of examples 1-2
As can be seen from Table 1, the bipolar plates of example 1 and example 2 of the present invention have a contact resistance of about 1mΩ cm 2 at a clamping pressure of 2MPa, a corrosion current density of about 3 μA/cm 2, and a hundred-test metal plating adhesion of 0 grade, comparable to that exhibited by noble metal coatings. In addition, the 3V constant potential ion precipitation amount is low, and the hydrogen leakage rate is less than 0.05mL/min under the pressure maintaining condition of 3.5MPa, which shows that the metal ion precipitation rate is low, the groove core is well sealed, and the long-term stable service of the electrolytic cell can be effectively supported.
Claims (6)
1. A bipolar plate for a PEM water electrolyser, characterized by the fact that it is made of stainless steel bipolar plates: a first contact region contacting the core member, a second contact region contacting the wire harness, and a region other than the first contact region and the second contact region being a non-contact region; carrying out partition plating treatment on the stainless steel bipolar plate: carrying out low-load noble metal coating treatment on the first contact area and the second contact area, and carrying out Teflon insulating coating treatment on the non-contact area; the low-load noble metal coating is a mixed coating or a double-layer coating of noble metal and non-noble metal;
The mass fraction of noble metal in the mixed coating is 8% -15%;
the double-layer coating is formed by coating a layer of non-noble metal coating on a stainless steel bipolar plate substrate and then coating a layer of noble metal coating; the thickness of the non-noble metal coating in the double-layer coating is 2.9-5.0 mu m, the thickness of the noble metal coating is 0.02-0.1 mu m, the non-noble metal is one of titanium, zirconium, chromium, niobium and tantalum, and the noble metal is one of platinum, gold, ruthenium and iridium.
2. The bipolar plate for a PEM water electrolyser of claim 1 wherein said stainless steel bipolar plate is one of a stainless steel flat plate with metal stretched or/and stamped mesh, a stainless steel flow field thick plate with etched flow channels, a stamped stainless steel stamped sheet.
3. The bipolar plate for a PEM water electrolyzer of claim 1 wherein said stainless steel bipolar plate is one of 304 stainless steel, 316L stainless steel and has a thickness of 0.5-2 mm.
4. The bipolar plate for a PEM water electrolyser of claim 1 wherein the total thickness of the low loading noble metal plating of said first contact zone or said second contact zone is from 3 to 5.5 μm.
5. The bipolar plate for a PEM water electrolyser of claim 1 wherein said teflon insulating coating has a thickness of 0.05 to 0.30mm.
6. The bipolar plate for a PEM water electrolyzer of claim 1 wherein said teflon insulating coating is one of polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, and soluble polytetrafluoroethylene.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410197365.1A CN118147675A (en) | 2024-02-22 | 2024-02-22 | Bipolar plate for PEM water electrolyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410197365.1A CN118147675A (en) | 2024-02-22 | 2024-02-22 | Bipolar plate for PEM water electrolyzer |
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| CN118147675A true CN118147675A (en) | 2024-06-07 |
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| CN202410197365.1A Pending CN118147675A (en) | 2024-02-22 | 2024-02-22 | Bipolar plate for PEM water electrolyzer |
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| Country | Link |
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| CN (1) | CN118147675A (en) |
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