CN111254460B

CN111254460B - Membrane electrode assembly and method for producing hydrogen by electrolysis

Info

Publication number: CN111254460B
Application number: CN201910103247.9A
Authority: CN
Inventors: 林国兴; 蔡丽端; 林有铭; 赵文轩; 黄秋萍; 杨秉兴; 黄筱君; 林俊男
Original assignee: Industrial Technology Research Institute ITRI
Current assignee: Industrial Technology Research Institute ITRI
Priority date: 2018-11-30
Filing date: 2019-02-01
Publication date: 2021-04-20
Anticipated expiration: 2039-02-01
Also published as: TW202022161A; CN111254460A; TWI677596B

Abstract

The invention discloses a membrane electrode assembly and a method for producing hydrogen by electrolysis, wherein the membrane electrode assembly comprises: an anode comprising a first catalyst layer on the first gas-liquid diffusion layer; the cathode comprises a second catalyst layer on the second gas-liquid diffusion layer; and an anion exchange membrane sandwiched between the first catalyst layer of the anode and the second catalyst layer of the cathode, wherein the chemical structure of the first catalyst layer is M'_aM”_bN₂Or M'_cM”_dC_eWherein M ' is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, M ' is Nb, Ta, or combinations thereof, 0.7. ltoreq. a.ltoreq.1.7, 0.3. ltoreq. b.ltoreq.1.3, a + b 2, 0.24. ltoreq. c.ltoreq.1.7, 0.3. ltoreq. d.ltoreq.1.76, and 0.38. ltoreq. e.ltoreq.3.61, wherein M '_aM”_bN₂Is of cubic crystal system, and M'_cM”_dC_eEither cubic or amorphous.

Description

Membrane electrode assembly and method for producing hydrogen by electrolysis

Technical Field

The invention relates to a membrane electrode assembly and a method for producing hydrogen by adopting membrane electrode assembly electrolysis.

Background

At present, the search for alternative energy is imperative, and hydrogen energy is the best alternative energy. Due to environmental protection concepts, the use of hydrogen as a fuel is expected to be environmentally friendly, and the electrolysis of water is the simplest way to produce hydrogen and oxygen. Although there are considerable advantages to hydrogen production by electrolysis of water, the process of producing hydrogen in large quantities has the fatal disadvantage of consuming considerable energy, resulting in non-compliance with costs. The energy consumption is often related to the overpotential, which is related to the electrodes, electrolyte, and reaction products. In order to improve the efficiency of water electrolysis, the electrodes play an important role. Lowering the activation energy and increasing the interface of the reaction are important factors for the efficiency of water electrolysis. The reduction in activation energy is effected by electrode surface catalysis, which depends on the catalytic properties of the electrode material itself. Although the noble metal IrO₂Has been one of the most catalytic electrode materials, but is quite expensive. To reduce the cost, IrO must be replaced by other materials₂。

In summary, a new catalyst (catalyst) composition is needed to further enhance the activities of the hydrogen production reaction (HER) and the oxygen production reaction (OER) so as to achieve the purposes of catalyst activity and cost reduction.

Disclosure of Invention

To achieve the above object, the present invention provides a membrane electrode assembly comprising: an anode comprising a first catalyst layer on the first gas-liquid diffusion layer; the cathode comprises a second catalyst layer on the second gas-liquid diffusion layer; and anionA proton exchange membrane sandwiched between the first catalyst layer of the anode and the second catalyst layer of the cathode, wherein the chemical structure of the first catalyst layer is M'_aM”_bN₂Or M'_cM”_dC_eWherein M ' is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, M ' is Nb, Ta, or combinations thereof, 0.7. ltoreq. a.ltoreq.1.7, 0.3. ltoreq. b.ltoreq.1.3, a + b 2, 0.24. ltoreq. c.ltoreq.1.7, 0.3. ltoreq. d.ltoreq.1.76, and 0.38. ltoreq. e.ltoreq.3.61, wherein M '_aM”_bN₂Is of cubic crystal system, and M'_cM”_dC_eEither cubic or amorphous.

In some embodiments, the membrane electrode assembly is immersed in an aqueous alkaline solution.

In some embodiments, the chemical structure of the first catalyst layer is Ni_aNb_bN₂0.7 £ a 1.51 and 0.49 £ b 1.30.

In some embodiments, the chemical structure of the first catalyst layer is Ni_cNb_dC_e0.90 £ c 1.47, 0.53 £ d 1.10, and 0.9 £ e 1.9.

In some embodiments, the chemical structure of the first catalyst layer is Ni_cNb_dC_eC is more than or equal to 0.74 and less than or equal to 1.63, d is more than or equal to 0.37 and less than or equal to 1.26, and e is more than or equal to 0.38 and less than or equal to 1.30.

In some embodiments, the chemical structure of the first catalyst layer is Co_cNb_dC_eC is more than or equal to 0.24 and less than or equal to 1.39, d is more than or equal to 0.61 and less than or equal to 1.76, and e is more than or equal to 0.63 and less than or equal to 3.61.

In some embodiments, the chemical structure of the second catalyst layer is M_xRu_yN₂Or M_xRu_yWherein M is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, 0<x<1.3，0.7<y<2，x+y＝2，M_xRu_yN₂Is cubic or amorphous, and M_xRu_yIs a cubic system.

In some embodiments, the first gas-liquid diffusion layer and the second gas-liquid diffusion layer each comprise a porous electrically conductive layer.

In some embodiments, the first gas-liquid diffusion layer is a metal mesh, and the second gas-liquid diffusion layer is a metal mesh or carbon paper.

In some embodiments, the first gas-liquid diffusion layer has a pore size between 40 microns and 150 microns, and the second gas-liquid diffusion layer has a pore size between 0.5 microns and 5 microns.

The invention also provides a method for producing hydrogen by electrolysis, which comprises the following steps: immersing a membrane electrode assembly in an alkaline aqueous solution, wherein the membrane electrode assembly comprises: an anode comprising a first catalyst layer on the first gas-liquid diffusion layer; the cathode comprises a second catalyst layer on the second gas-liquid diffusion layer; and an anion exchange membrane sandwiched between the first catalyst layer of the anode and the second catalyst layer of the cathode, wherein the chemical structure of the first catalyst layer is M'_aM”_bN₂Or M'_cM”_dC_eWherein M ' is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, M ' is Nb, Ta, or combinations thereof, 0.7. ltoreq. a.ltoreq.1.7, 0.3. ltoreq. b.ltoreq.1.3, a + b 2, 0.24. ltoreq. c.ltoreq.1.7, 0.3. ltoreq. d.ltoreq.1.76, and 0.38. ltoreq. e.ltoreq.3.61, wherein M '_aM”_bN₂Is of cubic crystal system, and M'_cM”_dC_eIs cubic or amorphous; and applying a potential to the anode and the cathode to electrolyze the aqueous alkaline solution, so that the cathode generates hydrogen and the anode generates oxygen.

In some embodiments, the first gas-liquid diffusion layer is a metal mesh and the second gas-liquid diffusion layer is carbon paper.

Drawings

FIG. 1 is a schematic view of a membrane electrode assembly according to an embodiment;

FIG. 2 shows an example of Ru catalyst and Ni_xRu_yOER profile of the catalyst;

FIG. 3 shows an example of Ru₂N₂Catalyst Ni_xRu_yN₂OER profile of the catalyst;

FIG. 4 shows an example of a Ru catalyst and Ni_xRu_yHER profile of the catalyst;

FIG. 5 shows an example of a Ru catalyst and Ni_xRu_yN₂HER profile of the catalyst;

FIG. 6 shows an embodiment of Ni₂N₂Catalyst and Mn_xRu_yN₂OER profile of the catalyst;

FIG. 7 shows an embodiment of Ni₂N₂Catalyst and Mn_xRu_yN₂HER profile of the catalyst;

FIG. 8 shows an embodiment of Ni_aNb_bN₂OER profile of the catalyst;

FIG. 9 shows an embodiment of Ni_cNb_dC_eCatalyst and Nb_0.6556C_1.3444OER profile of the catalyst;

FIG. 10 shows an embodiment of Ni_cNb_dC_eCatalyst and Nb_0.6556C_1.3444OER profile of the catalyst;

FIG. 11 shows an embodiment of Co_cNb_dC_eCatalyst and Nb_0.6556C_1.3444OER profile of the catalyst;

FIG. 12 shows an embodiment of Co_cNb_dC_eCatalyst and Nb_0.6556C_1.3444OER profile of the catalyst;

FIG. 13 shows an embodiment of Co_cNb_dC_eCatalyst and Nb_0.6556C_1.3444OER profile of the catalyst;

FIG. 14 shows an embodiment of Co_cNb_dC_eCatalyst and Nb_0.6556C_1.3444OER profile of the catalyst;

FIG. 15 shows an embodiment of Co_cNb_dC_eCatalyst and Nb_0.6556C_1.3444OER profile of the catalyst;

FIGS. 16 to 19 are graphs of current-voltage curves of MEA in examples;

FIG. 20 is a graph of current flow after long term operation of a MEA in one example.

Description of the symbols

11 an anode;

11A, 15A gas-liquid diffusion layer;

11B, 15B catalyst layers;

13 an anion exchange membrane;

15a cathode;

100 membrane electrode assemblies.

Detailed Description

The catalyst material provided by one embodiment of the invention has a chemical structure as follows: m'_aM”_bN₂Wherein M 'is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, M' is Nb, Ta, or combinations thereof, 0.7. ltoreq. a.ltoreq.1.7, 0.3. ltoreq. b.ltoreq.1.3, and a + b 2, wherein the catalyst material is cubic. In one embodiment, M 'is Ni, M' is Nb, a is more than or equal to 0.7 and less than or equal to 1.51, and b is more than or equal to 0.49 and less than or equal to 1.30. If a is too small (i.e., b is too large), the activity is poor. If a is too large (i.e., b is too small), the activity and stability are poor.

The catalyst material provided by one embodiment of the invention has a chemical structure as follows: m'_cM”_dC_eWherein M 'is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, M' is Nb, Ta, or a combination thereof, c is 0.24-1.7, d is 0.3-1.76, and e is 0.38-3.61, wherein the catalyst material is cubic or amorphous. In one embodiment, M 'is Ni and M' is Nb, c is 0.90-1.47, d is 0.53-1.10, and e is 0.9-1.9. In one embodiment, M 'is Ni and M' is Nb, c is more than or equal to 0.74 and less than or equal to 1.63, d is more than or equal to 0.37 and less than or equal to 1.26, and e is more than or equal to 0.38 and less than or equal to 1.30. In some embodiments, M 'is Co and M' is Nb, 0.24 ≦ c ≦ 1.39, 0.61 ≦ d ≦ 1.76, and 0.63 ≦ e ≦ 3.61. If c is too small (i.e., d is too large), the activity is poor. If c is too large (i.e., d is too small), the activity and stability are poor. If e is too small, the activity is poor. If e is too large, the activity and stability are not good.

An embodiment of the present invention provides a method for forming a catalyst material, including: placing an M 'target and an M' target in an atmosphere containing nitrogen, wherein M 'is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, and M' is Nb, Ta, or a combination thereof. Respectively providing power to the M 'target and the M' target; and providing ions to bombard the M ' target and the M ' target to sputter deposit M '_aM”_bN₂On the base material, wherein a is more than or equal to 0.7 and less than or equal to 1.7, b is more than or equal to 0.3 and less than or equal to 1.3, and a + b is 2, wherein M'_aM”_bN₂Is a cubic system. In one embodiment, the nitrogen-containing atmosphere is at a pressure between 1mTorr and 30 mTorr. If the atmosphere pressure containing nitrogen is too low, the nitriding reaction cannot be efficiently performed. If the atmosphere pressure containing nitrogen is too high, the nitriding reaction cannot be efficiently performed. In one embodiment, the nitrogen-containing atmosphere comprises a carrier gas such as helium, argon, other suitable inert gas, or a combination thereof, and the partial pressure ratio of nitrogen to the carrier gas is between 0.1 and 10. If the partial pressure ratio of nitrogen is too low, the nitriding reaction cannot be efficiently performed. If the partial pressure ratio of nitrogen is too high, the nitriding reaction cannot be efficiently performed. The above method provides power to the M 'target and the M' target, respectively. For example, the power supplied to the M' target is between 10W and 200W. If the power provided to the M 'target is too low, the ratio of M' in the catalyst material is too low. If the power supplied to the M 'target is too high, the ratio of M' in the catalyst material is too high. On the other hand, the power supplied to the M' target is between 10 and 200W. If the power provided to the M "target is too low, the ratio of M" in the catalyst material is too low. If the power supplied to the M 'target is too high, the ratio of M' in the catalyst material is too high. The power may be direct current power or radio frequency power.

The above methodIons are also provided to bombard the M 'and M "targets to sputter deposit M'_aM”_bN₂On a substrate. For example, nitrogen and a carrier gas may be plasma excited to form ions, and the ions may be made to strike the target. In one embodiment, the substrate comprises a porous conductive layer, such as a porous metal mesh (e.g., a stainless steel mesh, a titanium mesh, a nickel alloy mesh, a niobium alloy mesh, a copper mesh, or an aluminum mesh). The pore size of the porous conductive layer depends on M'_aM”_bN₂The use of (1). For example, if has M'_aM”_bN₂The porous conductive layer on the conductive layer is used as an anode (for OER) for electrolyzing alkaline aqueous solution, and the pore diameter of the porous conductive layer is between 40 and 150 microns.

An embodiment of the present invention provides a method for forming a catalyst material, including: placing an M 'target, an M' target, and a carbon target in a carrier gas atmosphere, wherein M 'is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, and M' is Nb, Ta, or a combination thereof. Respectively providing power to the M 'target material, the M' target material and the carbon target material; and providing ions to bombard the M 'target, and the carbon target to sputter deposit M'_cM”_dC_eC is more than or equal to 0.24 and less than or equal to 1.7, d is more than or equal to 0.3 and less than or equal to 1.76, and e is more than or equal to 0.38 and less than or equal to 3.61 on the base material, wherein M'_cM”_dC_eEither cubic or amorphous. In one embodiment, the pressure of the carrier gas atmosphere is between 1mTorr and 30 mTorr. If the carrier gas atmosphere pressure is too low, effective crystals cannot be formed. If the carrier gas atmosphere pressure is too high, effective crystals cannot be formed. In one embodiment, the carrier gas may be helium, argon, other suitable inert gas, or a combination thereof. The above method provides power to the M 'target, the M' target, and the carbon target, respectively. For example, the power supplied to the M' target is between 10 and 200W. If the power provided to the M 'target is too low, the ratio of M' in the catalyst material is too low. If the power supplied to the M 'target is too high, the ratio of M' in the catalyst material is too high. The power supplied to the M "target is between 10 and 200W. If the power provided to the M "target is too low, the ratio of M" in the catalyst material is too low. If provided to the M' targetToo high a power, the M "proportion in the catalyst material is too high. On the other hand, the power supplied to the carbon target is between 10 and 200W. If the power supplied to the carbon target is too low, the carbon ratio in the catalyst material is too low. If the power supplied to the carbon target is too high, the carbon ratio in the catalyst material is too high. The power may be direct current power or radio frequency power.

The above method also provides ion bombardment of M ' target, M ' target, and carbon target to sputter deposit M '_cM”_dC_eOn a substrate. For example, a carrier gas may be excited with a plasma to form ions, and the ions may be made to strike the target. In one embodiment, the substrate comprises a porous conductive layer, such as a porous metal mesh (e.g., a stainless steel mesh, a titanium mesh, a nickel alloy mesh, a niobium alloy mesh, a copper mesh, or an aluminum mesh). The pore size of the porous conductive layer depends on M'_cM”_dC_eThe use of (1). For example, if has M'_cM”_dC_eThe porous conductive layer on the conductive layer is used as an anode (for OER) for electrolyzing alkaline aqueous solution, and the pore diameter of the porous conductive layer is between 40 and 150 microns.

In one embodiment, the catalyst material can be used in a membrane electrode assembly for producing hydrogen by electrolysis. As shown in fig. 1, the membrane electrode assembly 100 includes an anode 11, a cathode 15, and an anion exchange membrane 13, and the anion exchange membrane is sandwiched between the anode 11 and the cathode 15. The anode 11 includes a catalyst layer 11B on the gas-liquid diffusion layer 11A, and the cathode 15 includes a catalyst layer 15B on the gas-liquid diffusion layer 15A. Furthermore, the method is simple. The anion exchange membrane 13 is interposed between the catalyst layer 11B of the anode 11 and the catalyst layer 15B of the cathode 15. The chemical structure of the catalyst layer 11B is M'_aM”_bN₂Or M'_cM”_dC_eAnd M', M ", a, b, c, d, and e are as defined above and are not repeated here.

In one embodiment, the anion exchange membrane 13 may be an imidazole polymer containing halogen ions or other suitable materials. For example, the anion exchange membrane 13 may be FAS available from Fumatech or X37-50 available from Dioxide materials. Since the membrane electrode assembly 100 is used for electrolyzing an alkaline aqueous solution to produce hydrogen, the anion exchange membrane 13 is used instead of other ion exchange membranes.

In one embodiment, the gas-liquid diffusion layer 11A and the gas-liquid diffusion layer 15A each include a porous conductive layer. For example, the gas-liquid diffusion layer 11A may be a porous metal mesh (e.g., a stainless steel mesh, a titanium mesh, a nickel alloy mesh, a niobium alloy mesh, a copper mesh, or an aluminum mesh). On the other hand, the gas-liquid diffusion layer 15A may be a porous metal mesh (e.g., a stainless steel mesh, a titanium mesh, a nickel alloy mesh, a niobium alloy mesh, a copper mesh, or an aluminum mesh) or a porous carbon material (e.g., carbon paper or carbon cloth). In one embodiment, the pore size of the gas-liquid diffusion layer 11A is between 40 microns and 150 microns. If the pore diameter of the gas-liquid diffusion layer 11A is too small, the mass transfer resistance increases. If the pore diameter of the gas-liquid diffusion layer 11A is too large, the active area is lost. In one embodiment, the pore size of the gas-liquid diffusion layer 15A is between 0.5 microns and 5 microns. If the pore diameter of the gas-liquid diffusion layer 15A is too small, the mass transfer resistance increases. If the pore diameter of the gas-liquid diffusion layer 15A is too large, the active area is lost.

In other embodiments, the gas-liquid diffusion layer 11A of the anode 11 and the gas-liquid diffusion layer 15A of the cathode 15 have different pore sizes and/or different compositions, or the catalyst layer 11B of the anode 11 and the catalyst layer 15B of the cathode 15 have different elemental compositions or elemental proportions, as desired. For example, the chemical structure of the catalyst layer 11B is M'_aM”_bN₂Or M'_cM”_dC_eAnd the chemical structure of the catalyst layer 15B is M_xRu_yN₂Or M_xRu_yWherein M is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, 0<x<1.3，0.7<y<2，x+y＝2，M_xRu_yN₂Is cubic or amorphous, and M_xRu_yIs a cubic system. In this embodiment, the gas-liquid diffusion layer 11A may be a porous metal mesh, and the gas-liquid diffusion layer 11B may be a porous carbon paper, to further increase the durability of the membrane electrode assembly in electrolysis. In another embodiment, the chemical structure of catalyst layer 11B is M'_aM”_bN₂Or M'_cM”_dC_eAnd cathode 15 may be a commercially available electrode.

The membrane electrode assembly can be used for hydrogen production by electrolysis. For example, the membrane electrode assembly may be immersed in an aqueous alkaline solution. For example, the basic aqueous solution can be an aqueous solution of NaOH, KOH, other suitable bases, or combinations thereof. In one embodiment, the pH of the basic aqueous solution is greater than 14 and less than 15. If the pH of the alkaline aqueous solution is too low, the conductivity is not good. If the pH of the aqueous alkaline solution is too high, the solution viscosity becomes too high. The above method also applies a potential to the anode and the cathode to electrolyze the aqueous alkaline solution, causing the cathode to generate hydrogen gas and the anode to generate oxygen gas.

In conclusion, the catalyst provided by the embodiment of the invention meets the requirement of electrolyzing alkaline aqueous solution to produce hydrogen. In the OER part, the catalyst can solve the problems of poor catalytic effect, poor conductivity, low oxidation and corrosion resistance and the like of the existing catalyst. The catalyst needs to have high conductivity and high OER electrochemical activity. In the diffusion point of view, the grain boundary diffusion coefficient of the catalyst of the embodiment of the invention at low temperature is far larger than the bulk diffusion coefficient. Since the impurity atoms M' added to the catalyst can fill the grain boundaries, the diffusion of the atoms through the grain boundaries can be blocked, thereby improving the performance of the catalyst. The fast diffusion paths of the catalyst, such as grain boundaries, etc., may be filled with certain materials to prevent adjacent material atoms from diffusing through grain boundaries or other defects. By inserting nitrogen atoms or carbon atoms into grain boundary gaps, the chance of diffusion of atoms through grain boundaries can be greatly reduced. In summary, the use of nitrogen and carbon atoms can increase oxidation resistance and material stability. Because nitrides or carbides are highly conductive and have a good balance between activity and cost, combining M "(close to Pt activity) with M' results in a catalyst with high conductivity and electrochemical activity.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, several embodiments accompanied with figures are described in detail below:

examples

Preparation example 1

A reactive magnetron sputter was used to deposit Pt catalyst on a glassy carbon electrode (5mm OD. times.4 mm H). The Pt target was placed in a sputter tool, power was applied to the Pt target, and argon gas (flow rate 20sccm) was introduced into the tool at a pressure of 30 mTorr. Argon ions are used to impact a Pt target material and sputtering is carried out for 5 to 6 minutes at room temperature, so as to form a Pt catalyst with the film thickness of about 100nm on a glassy carbon electrode, and the coating amount of the catalyst is 0.042 mg.

Preparation example 2

Respectively depositing Ni with different element ratios on a glassy carbon electrode (5mm OD multiplied by 4mm H) by adopting a reaction magnetron sputtering machine_xRu_yA catalyst. The Ni target and the Ru target are placed in a sputtering machine, the power (between 10 and 200W) applied to the Ni target and the power (between 10 and 200W) applied to the Ru target are adjusted, argon (with the flow rate of 20sccm) is introduced into the machine, and the pressure in the machine is 20 mTorr. Argon ions are used to impact the Ni target and the Ru target to perform reactive sputtering for 5 to 6 minutes at room temperature to form Ni with a film thickness of about 100nm_xRu_yThe catalyst is coated on the glassy carbon electrode, and the coating amount of the catalyst is 0.024 mg. Analysis of Ni by EDS_xRu_yCatalyst, x is between about 0.065 to 0.85 and y is between about 1.935 to 1.15. Analysis of Ni by SEM_xRu_yThe surface appearance of the catalyst is granular. Analysis of Ni by X-ray diffraction analysis (XRD)_xRu_yA catalyst which is cubic. On the other hand, the Ru target can be simply placed in a sputtering machine, and Ru catalyst with a film thickness of about 100nm is formed on the glassy carbon electrode by using similar parameters, and the coating amount of the catalyst is 0.024 mg.

Preparation example 3

Respectively depositing Ni with different element ratios on a glassy carbon electrode (5mm OD multiplied by 4mm H) by adopting a reaction magnetron sputtering machine_xRu_yN₂A catalyst. The Ni target and the Ru target were placed in a sputtering machine, the power applied to the Ni target (between 10 and 200W) and the power applied to the Ru target (between 10 and 200W) were adjusted, and nitrogen gas and argon gas (flow rate 20sccm) were introduced into the machine, where nitrogen gas/(argon gas + nitrogen gas) was 50%, and the pressure in the machine was 20 mTorr. Argon ions are used to impact the Ni target and the Ru target to perform reactive sputtering for 5 to 6 minutes at room temperature to form Ni with a film thickness of about 100nm_xRu_yN₂The catalyst is coated on the glassy carbon electrode, and the coating amount of the catalyst is 0.024 mg. By EDSPrecipitation of Ni_xRu_yN₂Catalyst, x is between about 0.069 and 1.086, and y is between about 1.931 and 0.914. Analysis of Ni by SEM_xRu_yN₂The surface appearance of the catalyst is triangular pyramid and quadrangular pyramid. Analysis of Ni by XRD_xRu_yN₂A catalyst which is cubic or amorphous. On the other hand, the Ru target can be placed in the sputter tool to form Ru with a film thickness of about 100nm by similar parameters₂N₂The catalyst is coated on the glassy carbon electrode, and the coating amount of the catalyst is 0.024 mg.

Example 1

Mixing the above Pt, Ru and Ru₂N₂、Ni_xRu_yAnd Ni_xRu_yN₂Catalyst, OER electrochemical activity test was performed as follows. Respectively taking Pt, Ru and Ru in 0.1MKOH solution₂N₂、Ni_xRu_yAnd Ni_xRu_yN₂The glassy carbon electrode on which the catalyst was formed served as the working electrode. Hg/HgO was taken as a reference electrode and platinum was taken as an auxiliary electrode. The scanning voltage range is-0.8-1V, the scanning speed is 50mV/s, and the scanning times are 10 times. Then, the CV measurement of OER is performed, the scanning voltage range is-0.8-0.1V, the scanning speed is 10mV/s, and the scanning times are 5 times. The OER results are shown in FIG. 2(Ru and Ni)_xRu_y) FIG. 3 (Ru)₂N₂And Ni_xRu_yN₂) As shown, the horizontal axis represents the potential (V) relative to the Reversible Hydrogen Electrode (RHE), and the vertical axis represents the current density (J, mA/cm)²). As shown in fig. 2, the pure Ru catalyst layer has no OER activity, while the Ru catalyst with Ni addition has significantly improved activity. As shown in FIG. 3, Ru₂N₂The catalyst activity is much higher than that of Ru catalyst, and Ru with a proper amount of Ni is added₂N₂Catalyst (i.e. Ni)_xRu_yN₂Catalyst) activity can be greatly improved. For example, Ni_xRu_yN₂X of (2) is between 0.4 and 1.1, which is preferable. A comparison of partial catalysts is shown in table 1:

TABLE 1

As can be seen from Table 1, Ni in OER_0.29Ru_1.71And Ni_0.46Ru_1.53N₂The current density of the catalyst is higher than that of the platinum film catalyst. However Ni_xRu_yHas no oxidation resistance and is therefore not suitable for application in OER. In other words, Ni_0.46Ru_1.53N₂More suitable for OER than platinum film catalysts.

Example 2

Mixing the above Pt, Ru and Ni_xRu_yAnd Ni_xRu_yN₂Catalyst, HER electrochemical activity test was performed as follows. Respectively taking Pt, Ru and Ru in 0.1MKOH solution₂N₂、Ni_xRu_yAnd Ni_xRu_yN₂The glassy carbon electrode on which the catalyst was formed served as the working electrode. Hg/HgO was taken as a reference electrode and platinum was taken as an auxiliary electrode. In the HER measurement part, the rotating speed of the working electrode is 1600rpm, the scanning voltage range is 0-1V, the scanning speed is 10mV/s, and the scanning times are 3 times. The HER results are shown in FIG. 4(Ru and Ni)_xRu_y) FIG. 5(Ru and Ni)_xRu_yN₂) As shown, the horizontal axis represents the potential (V) relative to the Reversible Hydrogen Electrode (RHE), and the vertical axis represents the current density (J, mA/cm)²). As shown in FIG. 4, Ni-added Ru catalyst (i.e., Ni)_xRu_y) The activity is obviously higher than that of the Ru catalyst. A comparison of partial catalysts is shown in table 2:

TABLE 2

As is clear from the above, Ni in HER_0.06Ru_1.93And Ni_1.2Ru_0.8N₂The current density of the catalyst is higher than that of the platinum film catalyst. In other words, Ni_0.06Ru_1.93And Ni_1.2Ru_0.8N₂The catalysts are all more suitable for HER than platinum film catalysts.

Preparation example 4

Respectively depositing Mn with different element ratios on a glassy carbon electrode (5mm OD multiplied by 4mm H) by adopting a reaction magnetron sputtering machine_xRu_yN₂A catalyst. The Mn target and the Ru target are placed in a sputtering machine, the power (between 10 and 200W) applied to the Mn target and the power (between 10 and 200W) applied to the Ru target are adjusted, nitrogen and argon (the flow rate is 20sccm) are introduced into the machine, the nitrogen/(argon + nitrogen) is 50%, and the pressure in the machine is 20 mTorr. Argon ions are used to impact the Mn target and the Ru target to perform reactive sputtering for 5 to 6 minutes at room temperature to form Mn with a film thickness of about 100nm_xRu_yN₂The catalyst is coated on the glassy carbon electrode, and the coating amount of the catalyst is 0.024 mg. Analysis of Mn by EDS_xRu_yN₂Catalyst, x is between about 0.01 and 0.8 and y is between about 1.2 and 1.99. Analysis of Mn by SEM_xRu_yN₂The surface appearance of the catalyst is triangular pyramid and quadrangular pyramid. Analysis of Mn by XRD_xRu_yN₂A catalyst which is cubic or amorphous.

Example 3

Adding the above Mn_xRu_yN₂Catalyst, OER electrochemical activity test was performed as follows. Taking Mn in 0.1MKOH solution_xRu_yN₂The glassy carbon electrode on which the catalyst was formed served as the working electrode. Taking Hg/HgO as a reference electrode, the rotating speed of a working electrode is 1600rpm, and taking platinum as an auxiliary electrode. The scanning voltage range is-0.8-1V, the scanning speed is 50mV/s, and the scanning times are 10 times. Then, the CV measurement of OER is performed, the scanning voltage range is-0.8-0.1V, the scanning speed is 10mV/s, and the scanning times are 5 times. The OER results are shown in FIG. 6 (Ni)₂N₂With Mn_xRu_yN₂) As shown, the horizontal axis represents the potential (V) relative to the Reversible Hydrogen Electrode (RHE), and the vertical axis represents the current density (J, mA/cm)²). As shown in FIG. 6, Ru was added in an appropriate amount₂N₂Catalyst (i.e. Mn)_xRu_yN₂Catalyst) activity can be greatly improvedAnd (5) rising. For example, Mn_xRu_yN₂X of (2) is between 0.3 and 0.7, which is preferred. A comparison of partial catalysts is shown in table 3:

TABLE 3

As can be seen from Table 3, Mn in OER_0.323Ru_1.677N₂The current density of the catalyst is higher than that of the platinum film catalyst. In other words, Mn_0.323Ru_1.677N₂More suitable for OER than platinum film catalysts.

Example 4

Adding Mn_xRu_yN₂Catalysts were tested for HER electrochemical activity as follows. Taking Mn in 0.1MKOH solution_xRu_yN₂The glassy carbon electrode on which the catalyst was formed served as the working electrode. Hg/HgO was taken as a reference electrode and platinum was taken as an auxiliary electrode. In the HER measurement part, the rotating speed of the working electrode is 1600rpm, the scanning voltage range is 0-1V, the scanning speed is 10mV/s, and the scanning times are 3 times. The HER results are shown in FIG. 7, in which the horizontal axis represents the potential (V) relative to the Reversible Hydrogen Electrode (RHE) and the vertical axis represents the current density (J, mA/cm)²). A comparison of partial catalysts is shown in table 4:

TABLE 4

As described above, Mn in HER_0.079Ru_1.92N₂The current density of the catalyst is higher than that of the platinum film catalyst. In other words, Mn_0.079Ru_1.92N₂The catalysts are all more suitable for HER than platinum film catalysts.

Preparation example 5

Respectively depositing Ni with different element ratios on a glassy carbon electrode (5mm OD multiplied by 4mm H) by adopting a reaction magnetron sputtering machine_aNb_bN₂A catalyst. Putting the Ni target and the Nb target into a sputtering machine, adjusting the power (between 10 and 200W) applied to the Ni target and the power (between 10 and 200W) applied to the Nb target, and introducing nitrogen and argon (the flow rate is 10sccm) into the machine, wherein the nitrogen/(argon + nitrogen) is 50 percent, and the pressure in the machine is 5 mTorr. Argon ions are used to impact the Ni target and the Nb target for reactive sputtering at room temperature for 5 to 6 minutes to form Ni with a film thickness of about 100nm_aNb_bN₂The catalyst is coated on a glassy carbon electrode, and the coating amount of the catalyst is 0.017 mg. Analysis of Ni by EDS_aNb_bN₂Catalyst, a is between about 0.3128 and 1.5082 and b is between about 0.5095 and 1.6872. Analysis of Ni by XRD_aNb_bN₂A catalyst which is cubic.

Preparation example 6

Respectively depositing Ni with different element ratios on a glassy carbon electrode (5mm OD multiplied by 4mm H) by adopting a reaction magnetron sputtering machine_cNb_dC_eA catalyst. Putting the Ni target, the Nb target and the carbon target into a sputtering machine, adjusting the power (between 10 and 200W) applied to the Ni target, the power (between 10 and 200W) applied to the Nb target and the power (between 10 and 200W applied to the carbon target), and introducing argon (10sccm) into the machine, wherein the pressure in the machine is 5 mTorr. Argon ions are used to impact the Ni target, the Nb target and the carbon target, and reactive sputtering is performed at room temperature for 5 to 6 minutes to form Ni with a film thickness of about 100nm_cNb_dC_eThe catalyst is coated on a glassy carbon electrode, and the coating amount of the catalyst is 0.017 mg. Analysis of Ni by EDS_cNb_dC_eCatalyst, c is between about 0.58 and 1.47, d is between about 0.53 and 1.42, and e is between about 0.92 and 2.47. Analysis of Ni by XRD_cNb_dC_eA catalyst which is cubic or amorphous. On the other hand, only the Nb target and the carbon target can be placed in a sputtering machine to form Nb with a film thickness of about 100nm by using similar parameters_0.6556C_1.3444The catalyst is coated on a glassy carbon electrode, and the coating amount of the catalyst is 0.017 mg.

Preparation example 7

Using a reactive magnetron sputtering machine, on a glassy carbon electrode (5mm OD x 4mm H)Respectively depositing Ni with different element ratios_cNb_dC_eA catalyst. Putting the Ni target, the Nb target and the carbon target into a sputtering machine, adjusting the power (between 10 and 200W) applied to the Ni target, the power (between 10 and 200W) applied to the Nb target and the power (between 10 and 200W applied to the carbon target), and introducing argon (10sccm) into the machine, wherein the pressure in the machine is 5 mTorr. Argon ions are used to impact the Ni target, the Nb target and the carbon target, and reactive sputtering is performed at room temperature for 5 to 6 minutes to form Ni with a film thickness of about 100nm_cNb_dC_eThe catalyst is coated on a glassy carbon electrode, and the coating amount of the catalyst is 0.017 mg. Analysis of Ni by EDS_cNb_dC_eCatalyst, c is between about 0.74 and 1.63, d is between about 0.37 and 1.26, and e is between about 0.38 and 1.30. Analysis of Ni by XRD_cNb_dC_eA catalyst which is cubic or amorphous.

Example 5

Mixing the above Pt and Ni_aNb_bN₂、Ni_cNb_dC_eAnd Nb_0.6556C_1.3444Catalyst, OER electrochemical activity test was performed as follows. Taking Pt and Ni in 0.1MKOH solution respectively_aNb_bN₂、Ni_cNb_dC_eAnd Nb_0.6556C_1.3444The glassy carbon electrode on which the catalyst was formed served as the working electrode. Taking Hg/HgO as a reference electrode, the rotating speed of a working electrode is 1600rpm, and taking platinum as an auxiliary electrode. The scanning voltage range is-0.8-1V, the scanning speed is 50mV/s, and the scanning times are 10 times. Then, the CV measurement of OER is performed, the scanning voltage range is-0.8-0.1V, the scanning speed is 10mV/s, and the scanning times are 5 times. The OER results are shown in FIG. 8 (Ni)_aNb_bN₂) FIG. 9 (Ni)_cNb_dC_eAnd Nb_0.6556C_1.3444) FIG. 10 (Ni)_cNb_dC_eAnd Nb_0.6556C_1.3444) As shown, the horizontal axis represents the potential (V) relative to the Reversible Hydrogen Electrode (RHE), and the vertical axis represents the current density (J, mA/cm)²). As shown in FIG. 8, Nb with an appropriate amount of Ni added₂N₂Catalyst (i.e. Ni)_aNb_bN₂) The activity is obviously improved. NbC catalyst (i.e., Ni) with the addition of an appropriate amount of Ni as shown in FIGS. 9 and 10_cNb_dC_eCatalyst) activity can be greatly improved. A comparison of partial catalysts is shown in table 5:

TABLE 5

As can be seen from Table 5, Ni in OER_1.5Nb_0.5N₂And Ni_1.62Nb_0.37C_0.39The current density of the catalyst is higher than that of the platinum film catalyst. In other words, Ni_1.5Nb_0.5N₂And Ni_1.62Nb_0.37C_0.39More suitable for OER than platinum film catalysts.

Preparation example 8

Co with different element ratios is respectively deposited on a glassy carbon electrode (5mm OD multiplied by 4mm H) by adopting a reaction magnetron sputtering machine_cNb_dC_eA catalyst. Placing the Co target, the Nb target and the carbon target into a sputtering machine, adjusting the power (between 30 and 100W) applied to the Co target, the power (35W) applied to the Nb target and the power (100W) applied to the carbon target, and introducing argon (10sccm) into the machine, wherein the pressure in the machine is 5 mTorr. Argon ions are used for impacting a Co target, an Nb target and a carbon target, and reactive sputtering is carried out for 10 to 15 minutes at room temperature, so as to form a CocNbdCe catalyst with the film thickness of about 100nm on a glassy carbon electrode, wherein the coating amount of the catalyst is 0.017 mg. Analysis of Co by EDS_cNb_dC_eCatalyst, c is between about 0.24 and 1.39, d is between about 0.61 and 1.76, and e is between about 0.63 and 3.61. Analysis of Co by XRD_cNb_dC_eA catalyst which is cubic or amorphous.

Example 6

Mixing the above Co_cNb_dC_eAnd Nb_0.6556C_1.3444Catalyst, OER electrochemical activity test was performed as follows. Respectively taking Co in 0.1MKOH solution_cNb_dC_eAnd Nb_0.6556C_1.3444The glassy carbon electrode on which the catalyst was formed served as the working electrode. Taking Hg/HgO as a reference electrode, the rotating speed of a working electrode is 1600rpm, and taking platinum as an auxiliary electrode. The scanning voltage range is-0.8-1V, the scanning speed is 50mV/s, and the scanning times are 10 times. Then, the CV measurement of OER is performed, the scanning voltage range is-0.8-0.1V, the scanning speed is 10mV/s, and the scanning times are 5 times. The OER results are shown in FIGS. 11 to 15 (Co)_cNb_dC_eAnd Nb_0.6556C_1.3444)As shown, the horizontal axis represents the potential (V) relative to the Reversible Hydrogen Electrode (RHE), and the vertical axis represents the current density (J, mA/cm)²). Nb with Co added in an appropriate amount, as shown in FIGS. 11 to 15_dC_eCatalyst (i.e. Co)_cNb_dC_e) The activity is obviously improved.

Preparation example 9

Depositing Ni on a stainless steel net (316 stainless steel, 200mesh 50mm multiplied by 50mm) by adopting a reaction magnetron sputtering machine_1.5Nb_0.5N₂A catalyst. Putting the Ni target and the Nb target into a sputtering machine, adjusting the power (10-200W) applied to the Ni target and the power (10-200W) applied to the Nb target, and introducing nitrogen and argon (the flow rate is 10sccm) into the machine, wherein the nitrogen/(argon + nitrogen) is 50%, and the pressure in the machine is 5 mTorr. Argon ions are used to impact the Ni target and the Nb target, and reactive sputtering is carried out for 8 minutes at room temperature to form Ni with the thickness of about 300nm_1.5Nb_0.5N₂The catalyst (confirmed by EDS) was coated on a stainless steel mesh in an amount of 0.17mg/cm per unit area of the catalyst coating². Analysis of Ni by XRD_1.5Nb_0.5N₂A catalyst which is cubic.

Example 7

A cathode was prepared by coating commercially available PtC (HISPEC 13100, Johnson Matthey) on H23C8(Freudenberg) carbon paper as HER, and controlling the coating amount per unit area of the cathode catalyst to 1.8mg/cm². Taking Ni of preparation example 9_1.5Nb_0.5N₂Stainless steel mesh as the anode of the OER and anion exchange membrane X37-50 (available from Dioxide Materials) sandwiched between the catalyst layers of the cathode and anode to form a membrane electrode assembly. The membrane electrode assembly was immersed in 2M KOH solution and tested for electrochemical activity as follows. The scanning voltage range is 1.3-2.2V, and the scanning speed is 50 mV/s. The current-voltage curve of the mea is shown in fig. 16, which can generate 10.2A of current at 2V, and the impedance of the whole test system is 27m Ω. The membrane electrode assembly had a decay rate of 0.001% per minute.

Preparation example 10

Depositing Ni on a stainless steel net (316 stainless steel, 200mesh 50mm multiplied by 50mm) by adopting a reaction magnetron sputtering machine_1.62Nb_0.37C_0.39A catalyst. Putting the Ni target, the Nb target and the carbon target into a sputtering machine, adjusting the power (10-200W) applied to the Ni target, the power (10-200W) applied to the Nb target and the power (10-200W) applied to the carbon target, and introducing argon (with the flow rate of 10sccm) into the machine, wherein the pressure in the machine is 5 mTorr. Argon ions are used to impact the Ni target, the Nb target and the carbon target, and reactive sputtering is carried out for 8 minutes at room temperature to form Ni with the thickness of about 300nm_1.62Nb_0.37C_0.39The catalyst (confirmed by EDS) was coated on a stainless steel mesh in an amount of 0.17mg/cm per unit area of the catalyst coating². Analysis of Ni by XRD_1.62Nb_0.37C_0.39A catalyst which is cubic or amorphous.

Example 8

A cathode was prepared by coating commercially available PtC (HISPEC 13100, Johnson Matthey) on H23C8(Freudenberg) carbon paper as HER, and controlling the coating amount per unit area of the cathode catalyst to 1.8mg/cm²Preparation of Ni of example 10_1.62Nb_0.37C_0.39Stainless steel mesh served as the anode of the OER and anion exchange membrane X37-50 (available from Dioxide Materials) was sandwiched between the catalyst layers of the cathode and anode to form a membrane electrode assembly. The membrane electrode assembly was immersed in 2M KOH solution and tested for electrochemical activity as follows. The scanning voltage range is 1.3-2.2V, and the scanning speed is 50 mV/s. The current-voltage curve of the mea is shown in fig. 17, which results in a current of 10.2A at 2V and a resistance of 33m Ω across the test system. The decay rate per minute of the membrane electrode assembly was 0.02%.

Comparative example 1

A cathode was prepared by coating commercially available PtC (HISPEC 13100, Johnson Matthey) on H23C8(Freudenberg) carbon paper as HER, and controlling the coating amount per unit area of the cathode catalyst to 1.8mg/cm²Commercially available DSA insoluble anode (IrO)₂/RuO₂Ti mesh, google energy technologies, inc.) as the anode of the OER, and an anion exchange membrane X37-50 (available from Dioxide Materials) was sandwiched between the catalyst layers of the cathode and anode to form a membrane electrode assembly. The membrane electrode assembly was immersed in 2M KOH solution and tested for electrochemical activity as follows. The scanning voltage range is 1.3-2.2V, and the scanning speed is 50 mV/s. The current-voltage curve of the mea is shown in fig. 18, which yields 10.6A at 2V and a total test system impedance of 40m Ω. The decay rate per minute of the membrane electrode assembly was 0.0087%.

The example 7, example 8, and membrane electrode assembly comparison with comparative example 1 are shown in table 6:

TABLE 6

As is clear from Table 6, Ni of the examples_1.5Nb_0.5N₂Catalyst and Ni_1.62Nb_0.37C_0.39The activity of the catalyst is far higher than that of the commercial anode catalyst.

Preparation example 11

Depositing Ni on a stainless steel mesh (316 stainless steel, 200mesh, 50mm x 50mm) by adopting a reaction magnetron sputtering machine_0.75Ru_1.25N₂A catalyst. The Ni target and the Ru target were placed in a sputtering machine, the power (150W) applied to the Ni target and the power (100W) applied to the Ru target were adjusted, and nitrogen gas and argon gas were introduced into the machine, where nitrogen gas/(argon gas + nitrogen gas) was 50%, and the pressure in the machine was 5 mTorr. Argon ions are used to impact the Ni target and the Ru target, and reactive sputtering is carried out for 8 minutes at room temperature to form Ni with the thickness of about 300nm_0.75Ru_1.25N₂The catalyst (confirmed by EDS) was coated on a stainless steel mesh in an amount of 0.17mg/cm per unit area of the catalyst coating². Analysis of Ni by SEM_0.75Ru_1.25N₂The surface appearance of the catalyst is triangular pyramid and quadrangular pyramid. Analysis of Ni by XRD_0.75Ru_1.25N₂A catalyst which is cubic or amorphous.

Example 9

Taking Ni of preparation example 11_0.75Ru_1.25N₂Stainless Steel mesh as the cathode for HER, Ni of preparation 9_1.5Nb_0.5N₂Stainless steel mesh served as the anode of the OER and anion exchange membrane X37-50 (available from Dioxide Materials) was sandwiched between the catalyst layers of the cathode and anode to form a membrane electrode assembly. The membrane electrode assembly was immersed in 2M KOH solution and tested for electrochemical activity as follows. The scanning voltage range is 1.3-2.2V, and the scanning speed is 50 mV/s. The membrane electrode assembly can generate 10.5A of current at 1.87V, and the impedance of the whole test system is 12m omega. The membrane electrode assembly had a decay rate per minute of 0.0057%.

Preparation example 12

Depositing Ni on carbon paper H23C8 (freedenberg, 50mm x 50mm) by using a reaction magnetron sputtering machine_0.75Ru_1.25N₂A catalyst. The Ni target and the Ru target were placed in a sputtering machine, the power (150W) applied to the Ni target and the power (100W) applied to the Ru target were adjusted, and nitrogen gas and argon gas were introduced into the machine, where nitrogen gas/(argon gas + nitrogen gas) was 50%, and the pressure in the machine was 5 mTorr. Argon ions are used to impact the Ni target and the Ru target, and reactive sputtering is carried out for 8 minutes at room temperature to form Ni with the thickness of about 300nm_0.75Ru_1.25N₂The catalyst (confirmed by EDS) was coated on carbon paper H23C8 in an amount of 0.17mg/cm per unit area of the catalyst². Analysis of Ni by SEM_0.75Ru_1.25N₂The surface appearance of the catalyst is triangular pyramid and quadrangular pyramid. Analysis of Ni by XRD_0.75Ru_1.25N₂A catalyst which is cubic or amorphous.

Example 10

Taking Ni of preparation example 12_0.75Ru_1.25N₂Carbon paper as cathode for HER, Ni of preparation 9_1.5Nb_0.5N₂-stainless steelThe steel mesh served as the anode of the OER and anion exchange membranes X37-50 (available from Dioxide Materials) were sandwiched between the catalyst layers of the cathode and anode to form a membrane electrode assembly. The membrane electrode assembly was immersed in 2M KOH solution and tested for electrochemical activity as follows. The scanning voltage range is 1.3-2.2V, and the scanning speed is 50 mV/s. The current-voltage curve of the mea is shown in fig. 19, which generates 10.5A of current at 1.96V, and the impedance of the entire test system is 17m Ω. The membrane electrode assembly had a decay rate of 0.000035% per minute. The potential of the membrane electrode assembly was controlled to 2V and the operation was continued for 48 hours, and the current was stabilized as shown in fig. 20. In other words, Ni_0.75Ru_1.25N₂Carbon paper resistant to reduction, Ni_1.5Nb_0.5N₂Stainless steel mesh resistant to oxidation and Ni_0.75Ru_1.25N₂Carbon paper with Ni_1.5Nb_0.5N₂The stainless steel net is resistant to alkaline corrosion.

The example 7, example 9, and membrane electrode assembly comparison with example 10 are shown in table 7:

TABLE 7

As is clear from Table 7, Ni was used for the catalyst layer of the cathode_0.75Ru_1.25N₂The catalyst can greatly improve the activity of the catalyst. In addition, Ni of the cathode_0.75Ru_1.25N₂When the catalyst is formed on the carbon paper, the durability of the membrane electrode assembly can be further improved.

Although the present invention has been described in connection with the above embodiments, it is not intended to limit the present invention, and those skilled in the art will be able to make various changes and modifications without departing from the spirit and scope of the present invention.

Claims

1. A membrane electrode assembly, comprising:

an anode comprising a first catalyst layer on the first gas-liquid diffusion layer;

the cathode comprises a second catalyst layer on the second gas-liquid diffusion layer; and

an anion exchange membrane sandwiched between the first catalyst layer of the anode and the second catalyst layer of the cathode,

wherein the chemical structure of the first catalyst layer is M'_aM”_bN₂Or M'_cM”_dC_eWherein M 'is Ni, Co or Fe, M' is Nb, a is more than or equal to 0.7 and less than or equal to 1.7, b is more than or equal to 0.3 and less than or equal to 1.3, a + b is 2, c is more than or equal to 0.24 and less than or equal to 1.7, d is more than or equal to 0.3 and less than or equal to 1.76, and e is more than or equal to 0.38 and less than or equal to 3.61,

wherein M'_aM”_bN₂Is of cubic crystal system, and M'_cM”_dC_eIs cubic or amorphous;

wherein the second catalyst layer has a chemical structure of M_xRu_yN₂Or Ni_xRu_yWherein M is Ni or Mn, 0<x<1.3，0.7<y<2，x+y＝2，M_xRu_yN₂Is cubic or amorphous, and Ni_xRu_yIs a cubic system.

2. The membrane electrode assembly of claim 1 immersed in an aqueous alkaline solution.

3. The mea of claim 1, wherein the first catalyst layer has a chemical structure of Ni_aNb_bN₂A is more than or equal to 0.7 and less than or equal to 1.51, and b is more than or equal to 0.49 and less than or equal to 1.30.

4. The mea of claim 1, wherein the first catalyst layer has a chemical structure of Ni_cNb_dC_eC is more than or equal to 0.90 and less than or equal to 1.47, d is more than or equal to 0.53 and less than or equal to 1.10, and e is more than or equal to 0.9 and less than or equal to 1.9.

5. The mea of claim 1, wherein the first catalyst layer has a chemical structure of Ni_cNb_dC_eC is more than or equal to 0.74 and less than or equal to 1.63, d is more than or equal to 0.37 and less than or equal to 1.26, and e is more than or equal to 0.38 and less than or equal to 1.30.

6. The mea of claim 1, wherein the first catalyst layer has a chemical structure of Co_cNb_dC_eC is more than or equal to 0.24 and less than or equal to 1.39, d is more than or equal to 0.61 and less than or equal to 1.76, and e is more than or equal to 0.63 and less than or equal to 3.61.

7. The mea of claim 1, wherein the first gas-liquid diffusion layer and the second gas-liquid diffusion layer each comprise a porous conductive layer.

8. The mea of claim 1, wherein the first gas-liquid diffusion layer is a metal mesh and the second gas-liquid diffusion layer is a metal mesh or carbon paper.

9. The mea of claim 7, wherein the first gdl has a pore size of 40-150 μm and the second gdl has a pore size of 0.5-5 μm.

10. A method for producing hydrogen by electrolysis, comprising:

immersing the membrane electrode assembly in alkaline aqueous solution,

wherein the membrane electrode assembly comprises:

wherein the second catalyst layer has a chemical structure of M_xRu_yN₂Or Ni_xRu_yWherein M is Ni or Mn, 0<x<1.3，0.7<y<2，x+y＝2，M_xRu_yN₂Is cubic or amorphous, and Ni_xRu_yIs a cubic system; and

applying a potential to the anode and the cathode to electrolyze the alkaline aqueous solution, so that the cathode generates hydrogen and the anode generates oxygen.

11. The method for producing hydrogen by electrolysis of claim 10, wherein the first gas-liquid diffusion layer and the second gas-liquid diffusion layer each comprise a porous conductive layer.

12. The method for producing hydrogen by electrolysis according to claim 10, wherein the first gas-liquid diffusion layer is a metal mesh, and the second gas-liquid diffusion layer is a metal mesh or carbon paper.

13. The method for producing hydrogen by electrolysis as claimed in claim 10, wherein the first gas-liquid diffusion layer has a pore size of 40-150 μm, and the second gas-liquid diffusion layer has a pore size of 0.5-5 μm.