A CoMoSP@NC catalyst for hydrogen isotope separation by water electrolysis and its preparation method
By preparing the CoMoSP@NC catalyst, the problems of high cost and low separation factor of precious metal catalysts were solved, and efficient hydrogen production and deuterium enrichment by water electrolysis were achieved. It is suitable for use in proton exchange membrane electrolyzers to co-produce heavy water.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
- Filing Date
- 2026-01-20
- Publication Date
- 2026-06-02
AI Technical Summary
Existing precious metal-based catalysts are expensive and have low separation factors, making it difficult to achieve efficient and low-cost hydrogen isotope separation, especially in the process of producing hydrogen from renewable energy through water electrolysis, where it is difficult to efficiently co-produce heavy water.
The CoMoSP@NC catalyst is used. This catalyst is a cobalt-molybdenum metal-organic framework that is sulfided and phosphated and then supported on nitrogen-doped carbon to form a porous morphology, providing a high specific surface area and electron transport channels. The synergistic effect of Co and Mo is used to regulate the hydrogen adsorption energy and enhance the selective reduction ability of deuterium.
It achieves efficient hydrogen production through water electrolysis while selectively separating deuterium, reducing catalyst costs and improving the hydrogen isotope separation factor. It is suitable for use in proton exchange membrane electrolyzers to co-produce high-value-added heavy water.
Smart Images
Figure CN122128746A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a CoMoSP@NC catalyst for separating hydrogen isotopes by water electrolysis and its preparation method, belonging to the fields of catalyst preparation technology, electrocatalysis technology, and hydrogen isotope separation technology. Background Technology
[0002] Hydrogen has three isotopes: protium (H), deuterium (D), and tritium (T). Heavy water, also known as deuterated water, has the chemical formula D₂O. In nature, the vast majority of hydrogen exists as protium; deuterium has a relatively low abundance, approximately 0.0156%, and tritium has an abundance of less than 0.001%. Heavy water is colorless, transparent, odorless, non-flammable, and non-explosive. Pure heavy water has a boiling point of 101.4℃ and a density of 1.1 g / cm³. 3 Heavier than water at room temperature, it is 10% heavier than ordinary water, hence the name heavy water. Heavy water is an important moderator and coolant in nuclear reactors, and also has important applications in nuclear magnetic resonance, biomedicine, optical fiber, and specialty chemistry. Because hydrogen isotopes have similar physicochemical properties, separating them is a very difficult task. Traditional heavy water production technologies, such as the Girdler sulfide (GS) process, suffer from problems such as complex processes, highly corrosive equipment, high energy consumption, significant environmental pollution, and low separation factors.
[0003] Under the "dual-carbon" policy, and with the energy industry's structural transformation towards green and low-carbon development, the renewable energy sectors of wind power and photovoltaics are developing rapidly. Hydrogen energy, as a clean secondary energy source, is increasingly important and has become a key area for strategic emerging industries and future industrial development. In the water electrolysis process, due to the kinetic isotope effect between protium (H) and deuterium (D), the electrolysis rate differs (H... + The discharge rate is much faster than D. + This leads to a relative enrichment of deuterium in the remaining liquid water after electrolysis. Considering current large-scale renewable energy water electrolysis hydrogen production projects, if the electrochemical concentration of the hydrogen isotope deuterium can be coupled into the renewable energy water electrolysis hydrogen production process, producing green hydrogen while simultaneously and efficiently and at low cost co-producing heavy water, a high-value-added product, would greatly improve the economics of photovoltaic / wind power generation water electrolysis hydrogen production projects and maximize resource utilization.
[0004] Developing efficient, stable, low-cost electrocatalysts with high separation factors is crucial for promoting the development of the hydrogen economy and hydrogen isotope separation. Currently, the catalysts used in commercial PEM electrolyzers are still noble metal-based materials (such as Pt / C for HER and IrO2 for OER), but their high cost and scarcity severely limit their large-scale commercial application, and their separation factors are relatively low, only 2-4.
[0005] Transition metal phosphides and sulfides are considered promising alternatives due to their excellent catalytic activity and stability. Among them, cobalt (Co)-based and molybdenum (Mo)-based compounds exhibit good intrinsic activity in HER. Theoretical studies and experiments show that constructing multi-metal centers (such as Co-Mo) can optimize the adsorption energy of intermediates through electronic structure modulation, thereby improving catalytic performance. Furthermore, combining the active component with highly conductive carbon materials (especially nitrogen-doped carbon, NC) can effectively prevent nanoparticle aggregation, increase electron conduction rate, and enhance structural stability. Summary of the Invention
[0006] The purpose of this invention is to provide a CoMoSP@NC catalyst for separating hydrogen isotopes in water electrolysis, so as to reduce the catalyst cost of commercial PEM electrolyzers and improve the separation factor of PEM electrolyzers.
[0007] The CoMoSP@NC catalyst for separating hydrogen isotopes by water electrolysis provided by the present invention is a cobalt-molybdenum sulfophosphoride loaded on nitrogen-doped carbon after sequential sulfidation and phosphating treatments using a cobalt-molybdenum metal-organic framework as a precursor. The CoMoSP@NC catalyst has a porous morphology, which is derived from the precursor through high-temperature sulfidation and phosphating.
[0008] The catalyst of this invention uses cobalt molybdenum sulfide phosphide as the active component, which is uniformly loaded on a nitrogen-doped carbon framework to form a CoMoSP@NC composite structure.
[0009] The catalyst of this invention uses a cobalt-molybdenum metal-organic framework as a precursor and is synthesized through a one-step aging process to ensure that Co and Mo atoms are uniformly dispersed at the molecular scale.
[0010] The catalyst of this invention has a three-dimensional porous structure derived from the precursor. This structure is retained and further enhanced during high-temperature sulfidation and phosphating, forming abundant mesopores and macropores.
[0011] The nitrogen-doped carbon framework of the catalyst of this invention not only provides high conductivity, but also serves as a structural support, effectively preventing the active components from agglomerating or being lost during the reaction process.
[0012] The catalyst of this invention has a high specific surface area and abundant active sites. The porous structure significantly increases the specific surface area of the catalyst, exposing more Co-Mo-SP active centers, which is beneficial to the reactants (H). + / D + Adsorption and activation of ).
[0013] The catalyst of this invention has excellent electron conduction and mass transfer capabilities, with a nitrogen-doped carbon framework providing a fast electron transport path; the three-dimensional interconnected channels promote electrolyte penetration and gaseous product escape, thereby enhancing reaction kinetics.
[0014] The catalyst of this invention exhibits an enhanced hydrogen isotope separation factor; the synergistic effect of Co and Mo regulates the hydrogen adsorption energy, amplifying the kinetic differences between protium and deuterium on the electrode surface; sulfur and phosphorus dual modification further optimizes the electronic structure of the active sites, improving the adsorption capacity for D. + Its selective reduction capability.
[0015] The present invention also provides a method for preparing the CoMoSP@NC catalyst, comprising the following steps: S1. Preparation of CoMo-MOF precursor: Cobalt salt, molybdenum source and 2-methylimidazole are mixed and reacted in solvent, and after aging, separation, washing and drying, CoMo-MOF powder is obtained; S2. Sulfurization treatment: The CoMo-MOF powder obtained in step S1 is mixed with a sulfur source, and the mixture is heated to the sulfurization temperature under a protective atmosphere to carry out a sulfurization reaction, thereby obtaining CoMoS@NC material. S3. Phosphating treatment: The CoMoS@NC material obtained in step S2 is placed separately from the phosphorus source and heated to the phosphating temperature under a protective atmosphere to carry out the phosphating reaction, thereby obtaining the CoMoSP@NC catalyst.
[0016] In step S1, the cobalt salt is cobalt nitrate or cobalt chloride; The molybdenum source in question is ammonium molybdate or sodium molybdate; The molar ratio of 2-methylimidazole to the cobalt salt is 3-5:1.
[0017] In step S1, the mass of the molybdenum source is 20% to 50% of the mass of the 2-methylimidazole.
[0018] In step S2, the sulfur source is sublimed sulfur, the sulfidation temperature is 450-550℃, and the sulfidation time is 1.5-3 hours.
[0019] In step S3, the phosphorus source is sodium hypophosphite, the phosphating temperature is 350-450℃, and the phosphating time is 1.5-2.5 hours.
[0020] The CoMoSP@NC catalyst of this invention can be applied to the separation of hydrogen isotopes in proton exchange membrane (PEM) water electrolysis. In this application, the CoMoSP@NC catalyst is preferably used as a cathode catalyst in a PEM electrolyzer to achieve efficient electrochemical separation and enrichment of hydrogen isotopes (such as deuterium) by utilizing its high activity and high selectivity.
[0021] Specifically, when the CoMoSP@NC catalyst is prepared as a cathode catalyst layer, its loading is controlled at 0.1 mg / cm³. 2 -10 mg / cm 2Within this range. This loading range has been experimentally verified to optimize catalyst utilization and membrane electrode structure while ensuring high catalytic activity and separation factor, avoiding problems such as insufficient activity due to too low a loading or increased mass transfer resistance and cost due to too high a loading.
[0022] Based on the above catalyst, the present invention also provides a method for separating hydrogen isotopes by proton exchange membrane electrolysis of water, using the CoMoSP@NC catalyst as the cathode catalyst, and generally including the following steps: (1) Membrane electrode preparation: The CoMoSP@NC catalyst, conductive agent, binder and solvent are mixed to prepare a cathode catalyst slurry, and coated or sprayed onto one side of the proton exchange membrane or the gas diffusion layer to form a cathode catalyst layer; at the same time, an anode catalyst layer (usually an oxygen evolution catalyst such as IrO2) is prepared on the other side of the proton exchange membrane, together forming the membrane electrode; (2) Electrolytic cell assembly: Assemble the above membrane electrode with components such as bipolar plates and seals to form a PEM electrolytic cell; (3) Electrolytic separation operation: Raw water containing hydrogen isotopes (such as deuterium-containing water) is introduced into the electrolytic cell, and electrolysis is carried out under the condition of applying an external voltage. Because the CoMoSP@NC catalyst has a high affinity for protium (H2O)... + ) and deuterium (D + The reduction of hydrogen isotopes exhibits kinetic differences, with protium preferentially precipitating out, leading to the continuous enrichment of deuterium in the liquid phase of the electrolyzer, thereby achieving the separation of hydrogen isotopes.
[0023] Compared with the prior art, the present invention has the following beneficial effects: (1) The non-noble metal CoMoSP@NC catalyst prepared by the method provided in this invention exhibits a porous morphology, which can provide a high specific surface area and abundant electron transport channels. It can effectively replace the traditional noble metal platinum-carbon electrode, and at the same time has a high hydrogen isotope separation factor.
[0024] (2) The preparation method of the present invention uses raw materials with low cost, simple preparation, readily available raw materials, economic and environmental protection, and is conducive to large-scale promotion. Attached Figure Description
[0025] Figure 1 A flowchart illustrating the preparation process of the CoMoSP@NC catalyst provided by this invention; Figure 2 Scanning electron microscope and EDS images of the CoMoSP@NC catalyst prepared in Example 1 of this invention; Figure 3 The XRD pattern of the CoMoSP@NC catalyst prepared in Example 1 of this invention; Figure 4The CoMoSP@NC catalysts prepared in Examples 1-3 of this invention were used for stability testing of the hydrogen isotope separation factor in a PEM electrolyzer. Detailed Implementation
[0026] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.
[0027] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.
[0028] This invention discloses a CoMoSP@NC catalyst for the separation of hydrogen isotopes in proton exchange membrane water electrolysis, using cobalt... Using a molybdenum metal-organic framework as a precursor, cobalt-molybdenum sulfide-phosphide is obtained by sequentially sulfiding and phosphating the precursor. Its unique porous morphology is derived from the precursor during the high-temperature sulfidation and phosphating process, and has a high specific surface area and abundant electron transport channels, which is conducive to exposing active sites and enhancing mass transfer processes.
[0029] This invention's catalyst, used as a non-precious metal cathode material, can replace traditional, expensive platinum-based catalysts in proton exchange membrane electrolyzers. While achieving efficient hydrogen production through water electrolysis, its high hydrogen isotope separation factor enables efficient enrichment of deuterium, thereby co-producing high-value-added heavy water. The preferred catalyst loading is 0.1-10 mg / cm³. 2 It ensures high activity while also taking into account economy and structural stability.
[0030] The catalyst preparation method provided by this invention is simple, uses readily available raw materials, and is inexpensive, making it suitable for large-scale production. It provides an economical and efficient technical approach for promoting hydrogen production through renewable energy electrolysis and heavy water co-production, and has significant industrial application value.
[0031] Unless otherwise specified, the raw materials used in this invention are preferably commercially available products.
[0032] Figure 1 The following is a flowchart illustrating the preparation process of the CoMoSP@NC catalyst provided by this invention, in conjunction with... Figure 1 The preparation method provided by the present invention will be described in detail.
[0033] Example 1 (NH4)6Mo7O 24 The mass of 4H2O is 2 50 wt% of MI (Milk Intake) is prepared by the following steps: Step (1): Preparation of CoMo-MOF precursor materials: 11.6412 g Co(NO3)2·6H2O and 9.852 g 2 MI was dissolved in 20 ml of deionized water to obtain Co(NO3)2·6H2O aqueous solution and 2 MI aqueous solution, stir evenly for half an hour; add 2 50 wt% of (NH4)6Mo7O by weight of MI 24 ·4H2O added containing 2 In an aqueous solution of MI, the mixture was stirred for 3 hours to obtain a Mo-containing solution. MI mixed aqueous solution; then, under vigorous stirring, add Co(NO3)2·6H2O aqueous solution to the Mo-containing 2 Mix the MI aqueous solution and stir for 2 hours; age at room temperature for 24 hours; collect the product by centrifugation and wash the product several times with deionized water; finally, dry the washed product in a vacuum drying oven at 60°C overnight to obtain light purple CoMo-MOF powder.
[0034] Step (2): Preparation of CoMoS@NC: 500 mg of CoMo-MOF powder and 1000 mg of sulfur source were ground and mixed, and then transferred to an alumina ceramic boat. The temperature was raised to 500℃ under a protective atmosphere. The heating rate to the sulfidation temperature was 5℃ / min. The sulfidation time was 2h.
[0035] Step (3): Preparation of CoMoSP@NC: Weigh 30 mg of CoMoS@NC powder and 500 mg of phosphorus source, and transfer them to alumina ceramic boats respectively. The alumina ceramic boat containing CoMoS@NC powder is placed downstream, and the alumina ceramic boat containing phosphorus source is placed upstream. Under a protective atmosphere, the temperature is raised to 400℃ at a rate of 5℃ / min to reach the phosphating temperature; the phosphating time is 2 hours.
[0036] Isopropanol and deionized water were mixed at a volume ratio of 1:1, ultrasonically dispersed, and then catalyst powder was added. The mixture was ultrasonically dispersed again, and then Nafion solution was added. After ultrasonic dispersion, cathodic liquid was obtained.
[0037] Isopropanol and deionized water were mixed at a volume ratio of 1:1, then IrO2 powder was added, followed by Nafion solution. The mixture was then ultrasonically dispersed to obtain the anolyte.
[0038] The catholy and anolyte were sprayed onto both sides of a Nafion 117 proton exchange membrane, respectively, to obtain a cathode catalyst loading of 5 mg / cm³. 2 The anolyte IrO2 loading was 2 mg / cm³. 2 The membrane electrode.
[0039] Test: An electrolyte with a deuterium isotope content of 0.3% was prepared, and the current density was 100 mA / cm². 2After electrolysis stabilizes at room temperature, the deuterium isotope content of the electrolyte and cathode gas is detected to obtain the separation factor. The separation factor is defined as the ratio of the atomic ratios of light isotopes to heavy isotopes in the enriched phase and the depleted phase.
[0040] Its separation factor is as follows Figure 4 As shown, the separation factor of the CoMoSP@NC catalyst is 4.7-4.9.
[0041] Figure 2 Scanning electron microscope (SEM) and EDS images of the CoMoSP@NC catalyst prepared in this embodiment show that the material surface is rough and irregular, with obvious unevenness and packing gaps, exhibiting a loose and porous aggregated morphology. EDS elemental mapping shows that Co, Mo, S, P, N and C are uniformly distributed on the catalyst particles.
[0042] Figure 3 The XRD pattern of the CoMoSP@NC catalyst prepared in this embodiment shows that compounds of Co, Mo, S, P, N and C are present in the material.
[0043] Example 2 (NH4)6Mo7O 24 The mass of 4H2O is 2 30 wt% of MI (Milk Intake) was prepared by the following steps: Step (1): Preparation of CoMo-MOF precursor materials: 11.6412 g Co(NO3)2·6H2O and 9.852 g 2 MI was dissolved in 20 ml of deionized water to obtain Co(NO3)2·6H2O aqueous solution and 2 MI aqueous solution, stir evenly for half an hour; add 2 30 wt% of (NH4)6Mo7O by weight of MI 24 ·4H2O added containing 2 In an aqueous solution of MI, the mixture was stirred for 3 hours to obtain a Mo-containing solution. MI mixed aqueous solution; then, under vigorous stirring, add Co(NO3)2·6H2O aqueous solution to the Mo-containing 2 Mix the MI aqueous solution and stir for 2 hours; age at room temperature for 24 hours; collect the product by centrifugation and wash the product several times with deionized water; finally, dry the washed product in a vacuum drying oven at 60°C overnight to obtain light purple CoMo-MOF powder.
[0044] Step (2): Preparation of CoMoS@NC: 500 mg of CoMo-MOF powder and 1000 mg of sulfur source were ground and mixed, and then transferred to an alumina ceramic boat. The mixture was heated to 500°C under a protective atmosphere at a heating rate of 5°C / min to the vulcanization temperature. The vulcanization time was 2 h.
[0045] Step (3): Preparation of CoMoSP@NC: Weigh 30 mg of CoMoS@NC powder and 500 mg of phosphorus source, and transfer them to alumina ceramic boats respectively. The alumina ceramic boat containing CoMoS@NC powder is placed downstream, and the alumina ceramic boat containing phosphorus source is placed upstream. Under a protective atmosphere, the temperature is raised to 400℃ at a rate of 5℃ / min to reach the phosphating temperature; the phosphating time is 2 hours.
[0046] Isopropanol and deionized water were mixed at a volume ratio of 1:1, ultrasonically dispersed, and then catalyst powder was added. The mixture was ultrasonically dispersed again, and then Nafion solution was added. After ultrasonic dispersion, cathodic liquid was obtained.
[0047] Isopropanol and deionized water were mixed at a volume ratio of 1:1, then IrO2 powder was added, followed by Nafion solution. The mixture was then ultrasonically dispersed to obtain the anolyte.
[0048] The catholy and anolyte were sprayed onto both sides of a Nafion 117 proton exchange membrane, respectively, to obtain a cathode catalyst loading of 5 mg / cm³. 2 The anolyte IrO2 loading was 2 mg / cm³. 2 The membrane electrode.
[0049] Test: An electrolyte with a deuterium isotope content of 0.3% was prepared, and the current density was 100 mA / cm². 2 After electrolysis stabilizes at room temperature, the deuterium isotope content of the electrolyte and cathode gas is measured to obtain the separation factor, such as... Figure 4 As shown, the separation factor of the CoMoSP@NC catalyst is 5.1-5.4.
[0050] Example 3 (NH4)6Mo7O 24 The mass of 4H2O is 2 20 wt% of MI (Milk) is prepared by the following steps: Step (1): Preparation of CoMo-MOF precursor materials: 11.6412 g Co(NO3)2·6H2O and 9.852 g 2 MI was dissolved in 20 ml of deionized water to obtain Co(NO3)2·6H2O aqueous solution and 2 MI aqueous solution, stir evenly for half an hour; add 2 20 wt% of (NH4)6Mo7O by mass of MI 24 ·4H2O added containing 2 In an aqueous solution of MI, the mixture was stirred for 3 hours to obtain a Mo-containing solution. MI mixed aqueous solution; then, under vigorous stirring, add Co(NO3)2·6H2O aqueous solution to the Mo-containing 2 Mix the MI aqueous solution and stir for 2 hours; age at room temperature for 24 hours; collect the product by centrifugation and wash the product several times with deionized water; finally, dry the washed product in a vacuum drying oven at 60°C overnight to obtain light purple CoMo-MOF powder.
[0051] Step (2): Preparation of CoMoS@NC: 500 mg of CoMo-MOF powder and 1000 mg of sulfur source were ground and mixed, and then transferred to an alumina ceramic boat. The temperature was raised to 500℃ under a protective atmosphere. The heating rate to the sulfidation temperature was 5℃ / min. The sulfidation time was 2h.
[0052] Step (3): Preparation of CoMoSP@NC: Weigh 30 mg of CoMoS@NC powder and 500 mg of phosphorus source, and transfer them to alumina ceramic boats respectively. The alumina ceramic boat containing CoMoS@NC powder is placed downstream, and the alumina ceramic boat containing phosphorus source is placed upstream. Under a protective atmosphere, the temperature is raised to 400℃ at a rate of 5℃ / min to reach the phosphating temperature; the sulfidation time is 2 hours.
[0053] Isopropanol and deionized water were mixed at a volume ratio of 1:1, ultrasonically dispersed, and then catalyst powder was added. The mixture was ultrasonically dispersed again, and then Nafion solution was added. After ultrasonic dispersion, cathodic liquid was obtained.
[0054] Isopropanol and deionized water were mixed at a volume ratio of 1:1, then IrO2 powder was added, followed by Nafion solution. The mixture was then ultrasonically dispersed to obtain the anolyte.
[0055] The catholy and anolyte were sprayed onto both sides of a Nafion 117 proton exchange membrane, respectively, to obtain a cathode catalyst loading of 5 mg / cm³. 2 The anolyte IrO2 loading was 2 mg / cm³. 2 The membrane electrode.
[0056] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.
[0057] Test: An electrolyte with a deuterium isotope content of 0.3% was prepared, and the current density was 100 mA / cm². 2After electrolysis stabilizes at room temperature, the deuterium isotope content of the electrolyte and cathode gas is measured to obtain the separation factor, such as... Figure 4 As shown, the separation factor of the CoMoSP@NC catalyst is 4.3-4.5.
[0058] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means is within the protection scope of the present invention.
Claims
1. A CoMoSP@NC catalyst for separating hydrogen isotopes by water electrolysis, comprising a cobalt-molybdenum metal-organic framework as a precursor, which is obtained by sequentially undergoing sulfidation and phosphating treatments to obtain a cobalt-molybdenum sulfophosphide supported on nitrogen-doped carbon. The CoMoSP@NC catalyst has a porous morphology, which is derived from the precursor through high-temperature sulfidation and phosphating.
2. The method for preparing the CoMoSP@NC catalyst according to claim 1, comprising the following steps: S1. Preparation of CoMo-MOF precursor: Cobalt salt, molybdenum source and 2-methylimidazole are mixed and reacted in solvent, and after aging, separation, washing and drying, CoMo-MOF powder is obtained; S2. Sulfurization treatment: The CoMo-MOF powder obtained in step S1 is mixed with a sulfur source, and the mixture is heated to the sulfurization temperature under a protective atmosphere to carry out a sulfurization reaction, thereby obtaining CoMoS@NC material. S3. Phosphating treatment: The CoMoS@NC material obtained in step S2 is placed separately from the phosphorus source and heated to the phosphating temperature under a protective atmosphere to carry out the phosphating reaction, thereby obtaining the CoMoSP@NC catalyst.
3. The preparation method according to claim 2, characterized in that: In step S1, the cobalt salt is cobalt nitrate or cobalt chloride; The molybdenum source is ammonium molybdate or sodium molybdate; The molar ratio of 2-methylimidazole to the cobalt salt is 3-5:
1.
4. The preparation method according to claim 2 or 3, characterized in that: In step S1, the mass of the molybdenum source is 20% to 50% of the mass of the 2-methylimidazole.
5. The preparation method according to any one of claims 2-4, characterized in that: In step S2, the sulfur source is sublimed sulfur, the sulfidation temperature is 450-550℃, and the sulfidation time is 1.5-3 hours.
6. The preparation method according to any one of claims 2-5, characterized in that: In step S3, the phosphorus source is sodium hypophosphite, the phosphating temperature is 350-450℃, and the phosphating time is 1.5-2.5 hours.
7. The application of the CoMoSP@NC catalyst according to claim 1 in the separation of hydrogen isotopes by proton exchange membrane water electrolysis.
8. The application according to claim 7, characterized in that: The CoMoSP@NC catalyst is used as a cathode catalyst in a proton exchange membrane electrolyzer.
9. The application according to claim 8, characterized in that: The cathode catalyst loading is 0.1 mg / cm³. 2 -10mg / cm 2 .
10. A method for separating hydrogen isotopes by proton exchange membrane electrolysis of water, using the CoMoSP@NC catalyst described in claim 1 as the cathode catalyst.