TWI677596B - Membrane electrode assembly and method for hydrogen evolution by electrolysis - Google Patents

Abstract

a

1.7，0.3

b

1.3，a+b=2，0.24

c

1.7，0.3

d

1.76，且0.38

e

3.61，其中M’_aM”_bN₂為立方晶系，且M’_cM”_dC_e為立方晶系或非晶。 The membrane electrode group includes: an anode including a first catalyst layer on a first gas-liquid diffusion layer; a cathode including a second catalyst layer on a second gas-liquid diffusion layer; and an anion exchange membrane sandwiched between the first Between a catalyst layer and the second catalyst layer of the cathode, the chemical structure of the first catalyst layer is M ' _a M ” _b N ₂ or M ′ _c M” _d C _e , where M ′ is Ni, Co , Fe, Mn, Cr, V, Ti, Cu, or Zn, M "is Nb, Ta, or a combination thereof, 0.7

a

1.7, 0.3

b

1.3, a + b = 2, 0.24

c

1.7, 0.3

d

1.76 and 0.38

e

3.61, wherein M _'a M _"b N ₂ is a cubic system, and M' _c M" _{d C e} is a cubic system or amorphous.

Description

Membrane electrode group and method for electrolytic hydrogen production

The present disclosure relates to a membrane electrode group and a method for electrolytically producing hydrogen using the membrane electrode group.

In today's energy shortage, it is imperative to seek alternative energy sources, and hydrogen is the best alternative energy source. Due to the concept of environmental protection, using hydrogen as a fuel meets environmental protection expectations. Electrolyzed water is the easiest way to produce hydrogen and oxygen. Although the use of electrolyzed water to produce hydrogen has considerable advantages, it has a fatal disadvantage in the process of producing large amounts of hydrogen, that is, it consumes a considerable amount of energy to cause cost inconsistencies. Energy consumption is mostly related to excessive overpotential, which is related to electrodes, electrolyte, and reaction products. To improve the efficiency of electrolyzed water, electrodes play an important role. Decreasing the activation energy and increasing the reaction interface are important factors for the efficiency of electrolyzed water. The decrease in activation energy is affected by the catalysis of the electrode surface, which depends on the catalytic properties of the electrode material itself. Although the noble metal IrO ₂ has been one of the most catalytically effective electrode materials, it is quite expensive. To reduce costs, IrO ₂ must be replaced with other materials.

In summary, a new catalyst composition is currently needed to further increase the activity of the hydrogen-producing reaction (HER) and the oxygen-producing reaction (OER) in order to take into account the catalyst activity and the purpose of reducing costs.

a

1.7，0.3

b

1.3，a+b=2，0.24

c

1.7，0.3

d

1.76，且0.38

e

3.61，其中M’_aM”_bN₂為立方晶系，且M’_cM”_dC_e為立方晶系或非晶。 The disclosed membrane electrode group includes an anode including a first catalyst layer on a first gas-liquid diffusion layer; a cathode including a second catalyst layer on a second gas-liquid diffusion layer; and 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 ' _a M " _b N ₂ or M' _c M" _d C _e , Where M 'is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, and M "is Nb, Ta, or a combination thereof, 0.7

a

1.7, 0.3

b

1.3, a + b = 2, 0.24

c

1.7, 0.3

d

1.76 and 0.38

e

3.61, wherein M _'a M _"b N ₂ is a cubic system, and M' _c M" _{d C e} is a cubic system or amorphous.

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

a

1.51，且0.49

b

1.30。 In some embodiments, the chemical structure of the first catalyst layer is Ni _a Nb _b N ₂ , 0.7

a

1.51, and 0.49

b

1.30.

c

1.47，0.53

d

1.10，且0.9

e

1.9。 In some embodiments, the chemical structure of the first catalyst layer is Ni _c Nb _d C _e , 0.90

c

1.47, 0.53

d

1.10 and 0.9

e

1.9.

c

1.63，0.37

d

1.26，且0.38

e

1.30。 In some embodiments, the chemical structure of the first catalyst layer is Ni _c Nb _d C _e , 0.74

c

1.63, 0.37

d

1.26 and 0.38

e

1.30.

c

1.39，0.61

d

1.76，且0.63

e

3.61。 In some embodiments, the chemical structure of the first catalyst layer is Co _c Nb _d C _e , 0.24

c

1.39, 0.61

d

1.76 and 0.63

e

3.61.

In some embodiments, the chemical structure of the second catalyst layer is M _x Ru _y N ₂ or M _x Ru _y , where M is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, 0 <x <1.3, 0.7 <y <2, x + y = 2, M _x Ru _y N ₂ is cubic or amorphous, and M _x Ru _y is cubic.

In some embodiments, each of the first gas-liquid diffusion layer and the second gas-liquid diffusion layer includes a porous 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 pore diameter of the first gas-liquid diffusion layer is between 40 microns and 150 microns, and the pore diameter of the second gas-liquid diffusion layer is between 0.5 microns and 5 microns.

a

1.7，0.3

b

1.3，a+b=2，0.24

c

1.7，0.3

d

1.76，且0.38

e

3.61，其中M’_aM”_bN₂為立方晶系，且M’_cM”_dC_e為立方晶系或非晶；以及施加電位至陽極與陰極以電解鹼性水溶液，使陰極產生氫氣，並使陽極產生氧氣。 An electrolytic hydrogen production method provided by an embodiment of the present invention includes: immersing a membrane electrode group in an alkaline aqueous solution, wherein the membrane electrode group includes: an anode, including a first catalyst layer on a first gas-liquid diffusion layer; The cathode includes 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 first catalyst layer Chemical structure is M ' _a M ” _b N ₂ or M ′ _c M” _d C _e , where M ′ is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, and M ”is Nb, Ta , Or a combination of the above, 0.7

a

1.7, 0.3

b

1.3, a + b = 2, 0.24

c

1.7, 0.3

d

1.76 and 0.38

e

3.61, where M ' _a M ” _b N ₂ is cubic and M' _c M” _d C _e is cubic or amorphous; and applying a potential to the anode and cathode to electrolyze alkaline aqueous solution to generate hydrogen at the cathode And make the anode produce oxygen.

In some embodiments, the chemical structure of the second catalyst layer is M _x Ru _y N ₂ or M _x Ru _y , where M is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, 0 <x <1.3, 0.7 <y <2, x + y = 2, M _x Ru _y N ₂ is cubic or amorphous, and M _x Ru _y is cubic.

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

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

In some embodiments, the pore diameter of the first gas-liquid diffusion layer is between 40 microns and 150 microns, and the pore diameter of the second gas-liquid diffusion layer is between 0.5 microns and 5 microns.

11‧‧‧Anode

11A, 15A‧‧‧‧Gas-liquid diffusion layer

11B, 15B‧‧‧ catalyst layer

13‧‧‧ anion exchange membrane

15‧‧‧ cathode

100‧‧‧ membrane electrode group

FIG. 1 is a schematic diagram of a membrane electrode group in an embodiment.

FIG. 2 is an OER curve of Ru catalyst and Ni _x Ru _y catalyst in an embodiment.

FIG. 3 is an OER curve of Ru ₂ N ₂ catalyst Ni _x Ru _y N ₂ catalyst in an embodiment.

FIG. 4 is a HER curve of Ru catalyst and Ni _x Ru _y catalyst in an embodiment.

FIG. 5 is a HER curve of Ru catalyst and Ni _x Ru _y N ₂ catalyst in an embodiment.

FIG. 6 is an OER curve of Ni ₂ N ₂ catalyst and Mn _x Ru _y N ₂ catalyst in an embodiment.

FIG. 7 is a HER curve of Ni ₂ N ₂ catalyst and Mn _x Ru _y N ₂ catalyst in an embodiment.

FIG. 8 is an OER curve of _a Ni _a Nb _b N ₂ catalyst in an embodiment.

FIG. 9 is an OER curve of Ni _c Nb _d C _e catalyst and Nb _0.6556 C _1.3444 catalyst in an embodiment.

FIG. 10 is an OER curve of Ni _c Nb _d C _e catalyst and Nb _0.6556 C _1.3444 catalyst in an embodiment.

FIG. 11 is an OER curve of Co _c Nb _d C _e catalyst and Nb _0.6556 C _1.3444 catalyst in an embodiment.

FIG. 12 is an OER curve of Co _c Nb _d C _e catalyst and Nb _0.6556 C _1.3444 catalyst in an embodiment.

FIG. 13 is an OER curve of Co _c Nb _d C _e catalyst and Nb _0.6556 C _1.3444 catalyst in an embodiment.

FIG. 14 is an OER curve of Co _c Nb _d C _e catalyst and Nb _0.6556 C _1.3444 catalyst in an embodiment.

FIG. 15 is an OER curve of Co _c Nb _d C _e catalyst and Nb _0.6556 C _1.3444 catalyst in an embodiment.

16 to 19 are current-voltage curves of the membrane electrode group in the embodiment.

FIG. 20 is a current diagram of a membrane electrode group after a long-term operation in an embodiment.

a

1.7，0.3

b

1.3，且a+b=2，其中觸媒材料為立方晶系。在一實施例中，M’為Ni，M”為Nb，0.7

a

1.51，且0.49

b

1.30。若a過小(即b過大)，則活性不佳。若a過大(即b過小)，則活性與穩定性不佳。 The catalyst material provided by an embodiment of the present disclosure has a chemical structure of: M ′ _a M ” _b N ₂ , where M ′ is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, M” Nb, Ta, or a combination of the above, 0.7

a

1.7, 0.3

b

1.3, and a + b = 2, where the catalyst material is cubic crystal system. In one embodiment, M 'is Ni, M "is Nb, 0.7

a

1.51, and 0.49

b

1.30. If a is too small (ie, b is too large), the activity is not good. If a is too large (ie, b is too small), the activity and stability are not good.

c

1.7，0.3

d

1.76，且0.38

e

3.61，其中觸媒材料為立方晶系或非晶。在一實施例中，M’為Ni且M”為Nb，0.90

c

1.47，0.53

d

1.10，且0.9

e

1.9。在一實施例中，M’為Ni且M”為Nb，0.74

c

1.63，0.37

d

1.26，且0.38

e

1.30。在一些實施例中，M’為Co且M”為Nb，0.24

c

1.39，0.61

d

1.76，且0.63

e

3.61。若c過小(即d過大)，則活性不佳。若c過大(即d過小)，則活性與穩定性不佳。若e過小，則活性不佳。若e過大，則活性與穩定性不佳。 The catalyst material provided by an embodiment of the present invention has a chemical structure of: M ′ _c M ” _d C _e , where M ′ is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, M” Nb, Ta, or a combination of the above, 0.24

c

1.7, 0.3

d

1.76 and 0.38

e

3.61, where the catalyst material is cubic or amorphous. In one embodiment, M 'is Ni and M "is Nb, 0.90

c

1.47, 0.53

d

1.10 and 0.9

e

1.9. In one embodiment, M 'is Ni and M "is Nb, 0.74

c

1.63, 0.37

d

1.26 and 0.38

e

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 (that is, d is too large), the activity is not good. If c is too large (that is, d is too small), the activity and stability are not good. If e is too small, the activity is not good. If e is too large, the activity and stability are not good.

a

1.7，0.3

b

1.3，且a+b=2，其中M’_aM”_bN₂為立方晶系。在一實施例中，含氮氣的氛圍壓力介於1mTorr至30mTorr之間。若含氮氣的氛圍壓力過低，則無法進行有效氮化反應。若含氮氣的氛圍壓力過高，則無法進行有效氮化反應。在一實施例中，含氮氣的氛圍包含載氣如氦氣、氬氣、其他合適的鈍氣、或上述之組合，且氮氣與載氣的分壓比例介於0.1-10之間。若氮氣的分壓比例過低，則無法進行有效氮化反應。若氮氣的分壓比例過高，則無法進行有效氮化反應。上述方法分別提供功率至M’靶材與M”靶材。舉例來說，提供至M’靶材的功率介於10-200W之間。若提供至M’靶材的功率過低，則觸媒材料中的M’比例過低。若提供至M’靶材的功率過高，則觸媒材料中的M’比例過高。另一方面，提供至M”靶材的功率介於10-200W之間。若提供至M”靶材的功率過低，則觸媒材料中的M”比例過低。若提供至M”靶材的功率過高，則觸媒材料中的M”比例過高。上述功率可為直流電功率或射頻功率。 A method for forming a catalyst material according to an embodiment of the present invention includes: placing an M 'target and an M "target in a nitrogen-containing atmosphere, where M' is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, and M "is Nb, Ta, or a combination thereof. Provide power to M 'target and M "target, respectively; and provide ion impact M' target and M" target to deposit M ' _a M " _b N ₂ on the substrate by sputtering, of which 0.7

a

1.7, 0.3

b

1.3, and a + b = 2, where M ′ _a M ” _b N ₂ is a cubic crystal system. In one embodiment, the atmospheric pressure containing nitrogen is between 1 mTorr and 30 mTorr. If the atmospheric pressure containing nitrogen is too low, If the nitrogen-containing atmosphere pressure is too high, the effective nitriding reaction cannot be performed. In one embodiment, the nitrogen-containing atmosphere includes a carrier gas such as helium, argon, or other suitable passivation. Gas, or a combination of the above, and the partial pressure ratio of nitrogen to the carrier gas is between 0.1-10. If the partial pressure ratio of nitrogen is too low, the effective nitriding reaction cannot be performed. If the partial pressure ratio of nitrogen is too high, Then an effective nitriding reaction cannot be performed. The above methods respectively provide power to the M 'target and the M "target. For example, the power provided to the M 'target is between 10-200W. If the power supplied to the M 'target is too low, the M' ratio in the catalyst material is too low. If the power supplied to the M 'target is too high, the M' ratio in the catalyst material is too high. On the other hand, the power supplied to the M "target is between 10-200W. If the power supplied to the M" target is too low, the M "ratio in the catalyst material is too low. If the power supplied to the M" target is too low If the power of the material is too high, the M "ratio in the catalyst material is too high. The above power can be DC power or RF power.

The above method also provides ion impact on the M 'target and the M "target to deposit M' _a M" _b N ₂ on the substrate by sputtering. For example, plasma can excite nitrogen and a carrier gas to form ions and cause the ions to hit the target. In one embodiment, the substrate includes a porous conductive layer, such as a porous metal mesh (such as a stainless steel mesh, a titanium mesh, a nickel 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 the use of M ' _a M ” _b N _2. For example, if a porous conductive layer having M' _a M” _b N ₂ on it is used as the anode for electrolytic alkaline aqueous solution (for OER ), The pore diameter of the porous conductive layer is between 40 microns and 150 microns.

c

1.7，0.3

d

1.76，且0.38

e

3.61，其中M’_cM”_dC_e為立方晶系或非晶。在一實施例中，載氣氛圍的壓力介於1mTorr至30mTorr之間。若載氣氛圍壓力過低，則無法形成有效結晶。若載氣氛圍壓力過高，則無法形成有效結晶。在一實施例中，載氣可為氦氣、氬氣、其他合適的鈍氣、或上述之組合。上述方法分別提供功率至M’靶材、M”靶材、與碳靶材。舉例來說，提供至M’靶材的功率介於10至200W之間。若提供至M’靶材的功率過低，則觸媒材料中的M’比例過低。若提供至M’靶材的功率過高，則觸媒材料中的M’比例過高。提供至M”靶材的功率介於10至200W之間。若提供至M”靶材的功率過低，則觸媒材料中的M”比例過低。若提供至M”靶材的功率過高，則觸媒材料中的M”比例過高。另一方面，提供至碳靶材的功率介於10至200W之間。若提供至碳靶材的功率過低，則觸媒材料中的碳比例過低。若提供至碳靶材的功率過高，則觸媒材料中的碳比例過高。上述功率可為直流 電功率或射頻功率。 A method for forming a catalyst material according to an embodiment of the present invention includes: placing an M 'target, an M "target, and a carbon target in a carrier gas atmosphere, where M' is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, and M "is Nb, Ta, or a combination thereof. Provide power to M 'target, M "target, and carbon target, respectively; and provide ion impact M' target, M" target, and carbon target to sputter deposit M ' _c M " _d C _e On the substrate, of which 0.24

c

1.7, 0.3

d

1.76 and 0.38

e

3.61, where M ' _c M ” _d C _e is cubic or amorphous. In one embodiment, the pressure of the carrier gas atmosphere is between 1 mTorr and 30 mTorr. If the pressure of the carrier gas atmosphere is too low, it will not be effective. Crystallization. If the atmospheric pressure of the carrier gas is too high, effective crystals cannot be formed. In one embodiment, the carrier gas can be helium, argon, other suitable inert gas, or a combination thereof. The above methods provide power to M 'Target, M' target, and carbon target. For example, the power provided to the M 'target is between 10 and 200W. If the power supplied to the M 'target is too low, the M' ratio in the catalyst material is too low. If the power supplied to the M 'target is too high, the M' ratio in the catalyst material is too high. The power supplied to the M "target is between 10 and 200W. If the power supplied to the M" target is too low, the M "ratio in the catalyst material is too low. If the power supplied to the M" target is too low High, the M "ratio in the catalyst material is too high. On the other hand, the power provided to the carbon target is between 10 and 200W. If the power provided to the carbon target is too low, the The carbon ratio is too low. If the power provided to the carbon target is too high, the carbon ratio in the catalyst material is too high. The above power can be DC power or RF power.

The above method also provides ion impact M 'target, M "target, and carbon target to deposit M' _c M" _d C _e on the substrate by sputtering. For example, a plasma can be used to excite a carrier gas to form ions and cause the ions to hit a target. In one embodiment, the substrate includes a porous conductive layer, such as a porous metal mesh (such as a stainless steel mesh, a titanium mesh, a nickel mesh, a nickel alloy mesh, a niobium alloy mesh, a copper mesh, or an aluminum mesh). The pore diameter of the porous conductive layer depends on the use of M ' _c M ” _d C _e . For example, if the porous conductive layer with M' _c M” _d C _e on it is used as the anode for electrolytic alkaline aqueous solution (for OER ), The pore diameter of the porous conductive layer is between 40 microns and 150 microns.

In one embodiment, the catalyst material can be used in a membrane electrode group for electrolytic hydrogen production. As shown in FIG. 1, the membrane electrode group 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. Also. 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 ′ _a M ” _b N ₂ or M ′ _c M” _d C _e , and the definitions of M ′, M ”, a, b, c, d, and e are the same as above, and here Not repeating.

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 purchased from Fumatech or X37-50 purchased from Dioxide materials. Since the membrane electrode group 100 is used to produce hydrogen from electrolytic alkaline aqueous solution, the anion exchange membrane 13 is used instead of other ion exchange membranes.

In one embodiment, each of the gas-liquid diffusion layer 11A and the gas-liquid diffusion layer 15A includes a porous conductive layer. For example, the gas-liquid diffusion layer 11A may be porous Metal mesh (such as stainless steel mesh, titanium mesh, nickel mesh, nickel alloy mesh, niobium alloy mesh, copper mesh, or aluminum mesh). On the other hand, the gas-liquid diffusion layer 15A may be a porous metal mesh (such as a stainless steel mesh, a titanium mesh, a nickel mesh, a nickel alloy mesh, a niobium alloy mesh, a copper mesh, or an aluminum mesh) or a porous carbon material (such as 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 is increased. If the pore diameter of the gas-liquid diffusion layer 11A is too large, the active area will be lost. In one embodiment, the pore size of the gas-liquid diffusion layer 15A is between 0.5 μm and 5 μm. If the pore diameter of the gas-liquid diffusion layer 15A is too small, the mass transfer resistance is increased. If the pore diameter of the gas-liquid diffusion layer 15A is too large, the active area will be 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 elements of the catalyst layer 11B of the anode 11 and the catalyst layer 15B of the cathode 15 The composition or proportion of the elements is different, depending on the needs. For example, the chemical structure of the catalyst layer 11B is M ′ _a M ” _b N ₂ or M ′ _c M” _d C _e , and the chemical structure of the catalyst layer 15B is M _x Ru _y N ₂ or M _x Ru _y , Where M is Ni, Co, Fe, Mn, Cr, V, Ti, Cu, or Zn, 0 <x <1.3, 0.7 <y <2, x + y = 2, and M _x Ru _y N ₂ is cubic Or amorphous, and M _x Ru _y is cubic. 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 group in electrolysis. In another embodiment, the chemical structure of the catalyst layer 11B is M ′ _a M ″ _b N ₂ or M ′ _c M ″ _d C _e , and the cathode 15 may be a commercially available electrode.

The membrane electrode group can be used for electrolytic hydrogen production. For example, the membrane electrode group can be immersed in an alkaline aqueous solution. For example, the alkaline aqueous solution may be an aqueous solution of NaOH, KOH, other suitable bases, or a combination thereof. In one embodiment, the pH of the alkaline aqueous solution is greater than 14 and less than 15. If alkaline water soluble If the pH of the liquid is too low, the conductivity is not good. If the pH of the alkaline aqueous solution is too high, the solution viscosity is too high. The above method also applies a potential to the anode and the cathode to electrolyze an alkaline aqueous solution, so that the cathode generates hydrogen and the anode generates oxygen.

In summary, the catalysts of the embodiments of the present disclosure meet the requirements for hydrogen production by electrolytic alkaline aqueous solution. In the OER part, the catalyst can solve the problems of poor catalytic performance, poor conductivity, and low oxidation and corrosion resistance of the conventional catalysts. The catalyst needs to have high conductivity and high OER electrochemical activity. In the diffusion view of the catalyst of the disclosed embodiment, the grain boundary diffusion coefficient at a low temperature is much larger than the bulk diffusion coefficient. Since the impurity atom M 'added to the catalyst can fill the grain boundaries, the atoms can be prevented from diffusing through the grain boundaries to improve its efficiency. The catalyst's fast diffusion path, such as grain boundaries, can be filled by certain materials to prevent adjacent material atoms from diffusing through the grain boundaries or other defects. By inserting nitrogen or carbon atoms in the gaps between the grain boundaries, the chance of atoms diffusing through the grain boundaries can be greatly reduced. In summary, the use of nitrogen and carbon atoms can increase oxidation resistance and material stability. Since nitride or carbide has good conductivity and balances activity and cost, combining M 'nitride or carbide (similar to Pt activity) in combination with M' can obtain a catalyst with high conductivity and electrochemical activity.

In order to make the above and other objects, features, and advantages of this disclosure more comprehensible, the following specific embodiments are described in detail with the accompanying drawings as follows:

Examples

Preparation Example 1

A reactive magnetron sputtering machine was used to deposit Pt catalyst on a glassy carbon electrode (5mm OD × 4mm H). The Pt target was placed in a sputtering machine, power was applied to the Pt target, and argon gas (flow rate: 20 sccm) was passed into the machine, and the pressure in the machine was 30 mTorr. The Pt target was impacted with argon ions, and sputtering was performed at room temperature for 5 to 6 minutes to form a Pt catalyst with a film thickness of about 100 nm on the glass carbon electrode, and the catalyst coating amount was 0.042 mg.

Preparation Example 2

A reactive magnetron sputtering machine was used to deposit Ni _x Ru _y catalysts with different element ratios on glass carbon electrodes (5mm OD × 4mm H). Put the Ni target and Ru target into the sputtering machine, adjust the power applied to the Ni target (between 10 and 200W) and the power of the Ru target (between 10 and 200W), and argon (flow rate 20sccm) into the machine, and the pressure inside the machine is 20mTorr. The Ni target and the Ru target were impacted with argon ions, and reactive sputtering was performed at room temperature for 5 to 6 minutes to form a Ni _x Ru _y catalyst with a film thickness of about 100 nm on the glass carbon electrode. The amount of catalyst coating It is 0.024 mg. The Ni _x Ru _y catalyst was analyzed by EDS, x was between about 0.065 and 0.85, and y was between about 1.935 and 1.15. The Ni _x Ru _y catalyst was analyzed by SEM, and its surface morphology was granular. The Ni _x Ru _y catalyst was analyzed by X-ray diffraction analysis (XRD), which is a cubic system. On the other hand, the Ru target can only be placed in a sputtering machine, and a Ru catalyst having a film thickness of about 100 nm can be formed on a glass carbon electrode with similar parameters, and the catalyst coating amount is 0.024 mg.

Preparation Example 3

A reactive magnetron sputtering machine was used to deposit Ni _x Ru _y N ₂ catalysts with different element ratios on glass carbon electrodes (5 mm OD × 4 mm H). Put the Ni target and Ru target into the sputtering machine, adjust the power applied to the Ni target (between 10 and 200W) and the power of the Ru target (between 10 and 200W), and nitrogen and argon (The flow rate is 20 sccm) into the machine, nitrogen / (argon + nitrogen) = 50%, and the pressure in the machine is 20mTorr. The Ni target and the Ru target were impacted with argon ions, and reactive sputtering was performed at room temperature for 5 to 6 minutes to form a Ni _x Ru _y N ₂ catalyst with a film thickness of about 100 nm on a glass carbon electrode. The coverage was 0.024 mg. The Ni _x Ru _y N ₂ catalyst was analyzed by EDS, and x was between about 0.069 and 1.086, and y was between about 1.931 and 0.914. The Ni _x Ru _y N ₂ catalyst was analyzed by SEM, and its surface morphology was triangular pyramid and quadrangular pyramid. The Ni _x Ru _y N ₂ catalyst was analyzed by XRD and was cubic or amorphous. On the other hand, the Ru target can be simply placed in a sputtering machine, and a Ru ₂ N ₂ catalyst having a film thickness of about 100 nm can be formed on a glassy carbon electrode with similar parameters, and the coating amount of the catalyst is 0.024 mg.

Example 1

OER electrochemical activity tests were performed on the Pt, Ru, Ru ₂ N ₂ , Ni _x Ru _y , and Ni _x Ru _y N ₂ catalysts as follows. In a 0.1 MKOH solution, Pt, Ru, Ru ₂ N ₂ , Ni _x Ru _y , and glassy carbon electrodes formed thereon with Ni _x Ru _y N ₂ catalysts were used as working electrodes. Take Hg / HgO as the reference electrode and platinum as the auxiliary electrode. Scanning voltage range: -0.8 ~ 1V, scanning speed is 50mV / s, and scanning times are 10 times. Then perform CER measurement of OER. The scanning voltage range is -0.8 ~ 0.1V, the scanning speed is 10mV / s, and the scanning times are 5 times. The above OER results are shown in Fig. 2 (Ru and Ni _x Ru _y ) and Fig. 3 (Ru ₂ N ₂ and Ni _x Ru _y N ₂ ). The horizontal axis is the potential relative to the reversible hydrogen electrode (RHE). (V), 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, and the Ru catalyst activity with Ni is significantly improved. As shown in FIG. 3, the Ru ₂ N ₂ catalyst activity is much higher than the Ru catalyst activity, and the activity of the Ru ₂ N ₂ catalyst (that is, Ni _x Ru _y N ₂ catalyst) added with an appropriate amount of Ni can be greatly improved. For example, Ni _x Ru _y N ₂ has a better effect when x is between 0.4 and 1.1. The comparison of some catalysts is shown in Table 1:

As can be seen from Table 1, the current densities of the Ni _0.29 Ru _1.71 and Ni _0.46 Ru _1.53 N ₂ catalysts in the OER are higher than those of the platinum film catalysts. However, Ni _x Ru _y is not suitable for OER because it has no antioxidant ability. In other words, Ni _0.46 Ru _1.53 N ₂ is more suitable for OER than platinum film catalyst.

Example 2

The Pt, Ru, Ni _x Ru _y , and Ni _x Ru _y N ₂ catalysts were subjected to a HER electrochemical activity test as follows. In a 0.1 MKOH solution, Pt, Ru, Ru ₂ N ₂ , Ni _x Ru _y , and glassy carbon electrodes formed thereon with Ni _x Ru _y N ₂ catalysts were used as working electrodes. Take Hg / HgO as the reference electrode and platinum as the auxiliary electrode. In the HER measurement part, the rotating speed of the working electrode is 1600 rpm, the scanning voltage range is 0 to 1V, the scanning speed is 10 mV / s, and the scanning number is 3 times. The above HER results are shown in Fig. 4 (Ru and Ni _x Ru _y ) and Fig. 5 (Ru and Ni _x Ru _y N ₂ ). The horizontal axis is the potential (V) with respect to the reversible hydrogen electrode (RHE), and the vertical axis is Current density (J, mA / cm ² ). As shown in FIG. 4, the activity of the Ru catalyst (ie, Ni _x Ru _y ) added with Ni is significantly higher than that of the Ru catalyst. The comparison of some catalysts is shown in Table 2:

It can be known from the above that the current density of the Ni _0.06 Ru _1.93 and Ni _1.2 Ru _0.8 N ₂ catalysts in HER are higher than the current density of the platinum film catalyst. In other words, Ni _0.06 Ru _1.93 and Ni _1.2 Ru _0.8 N ₂ catalysts are more suitable for HER than platinum film catalysts.

Preparation Example 4

A reactive magnetron sputtering machine was used to deposit Mn _x Ru _y N ₂ catalysts with different element ratios on glass carbon electrodes (5 mm OD × 4 mm H). Put the Mn target and Ru target into the sputtering machine, adjust the power applied to the Mn target (between 10 and 200W) and the power of the Ru target (between 10 and 200W), and nitrogen and argon (The flow rate is 20 sccm) into the machine, nitrogen / (argon + nitrogen) = 50%, and the pressure in the machine is 20mTorr. The Mn target and the Ru target were impacted with argon ions, and reactive sputtering was performed at room temperature for 5 to 6 minutes to form a Mn _x Ru _y N ₂ catalyst with a film thickness of about 100 nm on a glass carbon electrode. The coverage was 0.024 mg. The Mn _x Ru _y N ₂ catalyst was analyzed by EDS, and x was between about 0.01 and 0.8, and y was between about 1.2 and 1.99. The Mn _x Ru _y N ₂ catalyst was analyzed by SEM, and its surface morphology was triangular pyramid and quadrangular pyramid. The Mn _x Ru _y N ₂ catalyst was analyzed by XRD and was cubic or amorphous.

Example 3

The Mn _x Ru _y N ₂ catalyst was subjected to OER electrochemical activity test as follows. In a 0.1 MKOH solution, a glassy carbon electrode formed on the Mn _x Ru _y N ₂ catalyst was used as a working electrode. Take Hg / HgO as the reference electrode, rotate the working electrode at 1600 rpm, and take platinum as the auxiliary electrode. Scanning voltage range: -0.8 ~ 1V, scanning speed is 50mV / s, and scanning times are 10 times. Then perform CER measurement of OER. The scanning voltage range is -0.8 ~ 0.1V, the scanning speed is 10mV / s, and the scanning times are 5 times. The above OER results are shown in Fig. 6 (Ni ₂ N ₂ and Mn _x Ru _y N ₂ ), the horizontal axis is the potential (V) relative to the reversible hydrogen electrode (RHE), and the vertical axis is the current density (J, mA / cm ² ). As shown in FIG. 6, the activity of the Ru ₂ N ₂ catalyst (that is, Mn _x Ru _y N ₂ catalyst) added with an appropriate amount of Mn can be greatly improved. For example, when _{x of} Mn _x Ru _y N ₂ is between 0.3 and 0.7, a better effect can be obtained. The comparison of some catalysts is shown in Table 3: Table 3

As can be seen from Table 3, the current density of the Mn _0.323 Ru _1.677 N ₂ catalyst in the OER is higher than that of the platinum film catalyst. In other words, Mn _0.323 Ru _1.677 N ₂ is more suitable for OER than platinum film catalyst.

Example 4

Mn _x Ru _y N ₂ catalyst was subjected to HER electrochemical activity test as follows. In a 0.1 MKOH solution, a glassy carbon electrode formed on the Mn _x Ru _y N ₂ catalyst was used as a working electrode. Take Hg / HgO as the reference electrode and platinum as the auxiliary electrode. In the HER measurement part, the rotating speed of the working electrode is 1600 rpm, the scanning voltage range is 0 to 1V, the scanning speed is 10 mV / s, and the scanning number is 3 times. The above HER results are shown in FIG. 7. The horizontal axis is the potential (V) with respect to the reversible hydrogen electrode (RHE), and the vertical axis is the current density (J, mA / cm ² ). The comparison of some catalysts is shown in Table 4:

From the above, it is known that the current density of the Mn _0.079 Ru _1.92 N ₂ catalyst in HER is higher than that of the platinum film catalyst. In other words, Mn _0.079 Ru _1.92 N ₂ catalysts are more suitable for HER than platinum film catalysts.

Preparation Example 5

A reactive magnetron sputtering machine was used to deposit Ni _a Nb _b N ₂ catalysts with different element ratios on glass carbon electrodes (5 mm OD × 4 mm H). Put the Ni target and Nb target into the sputtering machine, adjust the power applied to the Ni target (between 10 and 200W) and the power of the Nb target (between 10 and 200W), and nitrogen and argon (Flow rate is 10 sccm) into the machine, nitrogen / (argon + nitrogen) = 50%, and the pressure in the machine is 5mTorr. Ni target and Nb target were impacted with argon ions, and reactive sputtering was performed at room temperature for 5 to 6 minutes to form a Ni _a Nb _b N ₂ catalyst with a film thickness of about 100 nm on _a glass carbon electrode. The coverage was 0.017 mg. The Ni _a Nb _b N ₂ catalyst was analyzed by EDS, a was between about 0.3128 and 1.5082, and b was between about 0.5095 and 1.6872. The Ni _a Nb _b N ₂ catalyst was analyzed by XRD, which was a cubic crystal system.

Preparation Example 6

A reactive magnetron sputtering machine was used to deposit Ni _c Nb _d C _e catalysts with different element ratios on glass carbon electrodes (5 mm OD × 4 mm H). Place the Ni target, Nb target, and carbon target in the sputtering machine, and adjust the power applied to the Ni target (between 10 and 200W), the power of the Nb target (between 10 and 200W), and carbon. The power of the target (between 10 and 200W), and argon (10sccm) was passed into the machine, and the pressure inside the machine was 5mTorr. Ni target, Nb target, and carbon target were impacted with argon ions, and reactive sputtering was performed at room temperature for 5 to 6 minutes to form a Ni _c Nb _d C _e catalyst with a film thickness of about 100 nm on a glass carbon electrode. Above, the catalyst coating amount is 0.017 mg. The Ni _c Nb _d C _e catalyst was analyzed by EDS. C was between about 0.58 and 1.47, d was between about 0.53 and 1.42, and e was between about 0.92 and 2.47. The Ni _c Nb _d C _e catalyst was analyzed by XRD, and it was cubic or amorphous. On the other hand, only Nb target and carbon target can be placed in the sputtering machine, and Nb _0.6556 C _1.3444 catalyst with a film thickness of about 100 nm can be formed on the glass carbon electrode with similar parameters, and the catalyst coating amount is 0.017 mg. .

Preparation Example 7

A reactive magnetron sputtering machine was used to deposit Ni _c Nb _d C _e catalysts with different element ratios on glass carbon electrodes (5 mm OD × 4 mm H). Place the Ni target, Nb target, and carbon target in the sputtering machine, and adjust the power applied to the Ni target (between 10 and 200W), the power of the Nb target (between 10 and 200W), and carbon. The power of the target (between 10 and 200W), and argon (10sccm) was passed into the machine, and the pressure inside the machine was 5mTorr. Ni target, Nb target, and carbon target were impacted with argon ions, and reactive sputtering was performed at room temperature for 5 to 6 minutes to form a Ni _c Nb _d C _e catalyst with a film thickness of about 100 nm on a glass carbon electrode. Above, the catalyst coating amount is 0.017 mg. The Ni _c Nb _d C _e catalyst was analyzed by EDS. C was between about 0.74 and 1.63, d was between about 0.37 and 1.26, and e was between about 0.38 and 1.30. The Ni _c Nb _d C _e catalyst was analyzed by XRD, and it was cubic or amorphous.

Example 5

The OER electrochemical activity test was performed on the Pt, Ni _a Nb _b N ₂ , Ni _c Nb _d C _e , and Nb _0.6556 C _1.3444 catalysts as follows. In a 0.1 MKOH solution, Pt, Ni _a Nb _b N ₂ , Ni _c Nb _d C _e , and a glass carbon electrode formed with a Nb _0.6556 C _1.3444 catalyst were used as working electrodes. Take Hg / HgO as the reference electrode, rotate the working electrode at 1600 rpm, and take platinum as the auxiliary electrode. Scanning voltage range: -0.8 ~ 1V, scanning speed is 50mV / s, and scanning times are 10 times. Then perform CER measurement of OER. The scanning voltage range is -0.8 ~ 0.1V, the scanning speed is 10mV / s, and the scanning times are 5 times. The above OER results are shown in Fig. 8 (Ni _a Nb _b N ₂ ), Fig. 9 (Ni _c Nb _d C _e and Nb _0.6556 C _1.3444 ), and Fig. 10 (Ni _c Nb _d C _e and Nb _0.6556 C _1.3444 ), The horizontal axis is the potential (V) with respect to the reversible hydrogen electrode (RHE), and the vertical axis is the current density (J, mA / cm ² ). As shown in FIG. 8, the activity of the Nb ₂ N ₂ catalyst (that is, Ni _a Nb _b N ₂ ) added with an appropriate amount of Ni is significantly improved. As shown in FIGS. 9 and 10, the activity of the NbC catalyst (ie, the Ni _c Nb _d C _e catalyst) added with an appropriate amount of Ni can be greatly improved. The comparison of some catalysts is shown in Table 5:

As can be seen from Table 5, the current densities of the Ni _1.5 Nb _0.5 N ₂ and Ni _1.62 Nb _0.37 C _0.39 catalysts in the OER are higher than those of the platinum film catalysts. In other words, Ni _1.5 Nb _0.5 N ₂ and Ni _1.62 Nb _0.37 C _0.39 are more suitable for OER than platinum film catalysts.

Preparation Example 8

Using a reactive magnetron sputtering machine, Co _c Nb _d C _e catalysts with different element ratios were deposited on glass carbon electrodes (5 mm OD × 4 mm H). Place the Co target, Nb target, and carbon target into the sputtering machine, and adjust the power applied to the Co target (between 30-100W), the power of the Nb target (35W), and the power of the carbon target (100W), and argon gas (10sccm) was passed into the machine, and the pressure inside the machine was 5 mTorr. The Co target, Nb target, and carbon target were impacted with argon ions, and reactive sputtering was performed at room temperature for 10 to 15 minutes to form a Co _c Nb _d C _e catalyst with a film thickness of about 100 nm on a glass carbon electrode. Above, the catalyst coating amount is 0.017 mg. The Co _c Nb _d C _e catalyst was analyzed by EDS. C was between about 0.24 and 1.39, d was between about 0.61 and 1.76, and e was between about 0.63 and 3.61. The Co _c Nb _d C _e catalyst was analyzed by XRD, and it was cubic or amorphous.

Example 6

The above Co _c Nb _d C _e and Nb _0.6556 C _1.3444 catalysts were tested for OER electrochemical activity as follows. In a 0.1MKOH solution, glass carbon electrodes formed by Co _c Nb _d C _e and Nb _0.6556 C _1.3444 catalysts were used as working electrodes. Take Hg / HgO as the reference electrode, rotate the working electrode at 1600 rpm, and take platinum as the auxiliary electrode. Scanning voltage range: -0.8 ~ 1V, scanning speed is 50mV / s, and scanning times are 10 times. Then perform CER measurement of OER. The scanning voltage range is -0.8 ~ 0.1V, the scanning speed is 10mV / s, and the scanning times are 5 times. The above OER results are shown in Figs. 11 to 15 (Co _c Nb _d C _e and Nb _0.6556 C _1.3444 ). The horizontal axis is the potential (V) relative to the reversible hydrogen electrode (RHE), and the vertical axis is the current density (J, mA / cm ² ). As shown in FIG. 11 to FIG. 15, the activity of the Nb _d C _c catalyst (that is, Co _c Nb _d C _e ) added with an appropriate amount of Co was significantly improved.

Preparation Example 9

A reactive magnetron sputtering machine was used to deposit a Ni _1.5 Nb _0.5 N ₂ catalyst on a stainless steel mesh (316 stainless steel, 200 mesh 50 mm × 50 mm). Put the Ni target and Nb target into the sputtering machine, adjust the power applied to the Ni target (10-200W) and the power of the Nb target (10-200W), and nitrogen and argon (flow rate is 10 sccm) ) Into the machine, nitrogen / (argon + nitrogen) = 50%, and the pressure in the machine is 5mTorr. Ni target and Nb target were impacted with argon ions, and reactive sputtering was performed at room temperature for 8 minutes to form a Ni _1.5 Nb _0.5 N ₂ catalyst (confirmed by EDS) with a film thickness of about 300 nm on a stainless steel net. The area covered by the catalyst was 0.17 mg / cm ² . The Ni _1.5 Nb _0.5 N ₂ catalyst was analyzed by XRD, and it was a cubic crystal system.

Example 7

A commercially available PtC (HISPEC 13100, Johnson Matthey) was coated on H23C8 (Freudenberg) carbon paper as a cathode of HER, and the coating amount per unit area of the cathode catalyst was controlled to 1.8 mg / cm ² . Take Ni _1.5 Nb _0.5 N ₂ -stainless steel mesh of Preparation Example 9 as the anode of OER, and sandwich an anion exchange membrane X37-50 (purchased from Dioxide Materials) between the cathode and the catalyst layer of the anode to form a membrane electrode group. The membrane electrode group was immersed in a 2M KOH solution, and the electrochemical activity test was performed as follows. Scanning voltage range: 1.3 ~ 2.2V, scanning speed is 50mV / s. The current-voltage curve of the above-mentioned membrane electrode group is shown in Fig. 16. At 2V, a current of 10.2A can be generated, and the impedance of the entire test system is 27mΩ. The above-mentioned membrane electrode group has a decay rate per minute of 0.001%.

Preparation Example 10

A reactive magnetron sputtering machine was used to deposit Ni _1.62 Nb _0.37 C _0.39 catalyst on a stainless steel mesh (316 stainless steel, 200 mesh 50 mm × 50 mm). Put the Ni target, Nb target, and carbon target into the sputtering machine, and adjust the power applied to the Ni target (10-200W), the power of the Nb target (10-200W), and the carbon target. Power (10-200W), and argon gas (flow rate: 10 sccm) is passed into the machine, and the pressure in the machine is 5mTorr. Ni target, Nb target, and carbon target were impacted with argon ions, and reactive sputtering was performed at room temperature for 8 minutes to form a Ni _1.62 Nb _0.37 C _0.39 catalyst (confirmed by EDS) with a film thickness of about 300 nm. On the stainless steel net, the catalyst coating amount per unit area was 0.17 mg / cm ² . XRD analysis of Ni _1.62 Nb _0.37 C _0.39 catalyst, which is cubic or amorphous.

Example 8

A commercially available PtC (HISPEC 13100, Johnson Matthey) was coated on H23C8 (Freudenberg) carbon paper as a cathode of HER. The coating amount per unit area of the cathode catalyst was controlled to 1.8 mg / cm ² , and Ni _1.62 Nb in Preparation Example 10 _0.37 C _0.39 -The stainless steel mesh is used as the anode of the OER, and an anion exchange membrane X37-50 (purchased from Dioxide Materials) is sandwiched between the cathode and the catalyst layer of the anode to form a membrane electrode group. The membrane electrode group was immersed in a 2M KOH solution, and the electrochemical activity test was performed as follows. Scanning voltage range: 1.3 ~ 2.2V, scanning speed is 50mV / s. The current-voltage curve of the above-mentioned membrane electrode group is shown in FIG. 17. At 2V, a current of 10.2A can be generated, and the impedance of the entire test system is 33mΩ. The above-mentioned membrane electrode group has a decay rate per minute of 0.02%.

Comparative Example 1

A commercially available PtC (HISPEC 13100, Johnson Matthey) was coated on H23C8 (Freudenberg) carbon paper as the cathode of the HER. The coverage per unit area of the cathode catalyst was controlled to 1.8 mg / cm ^{2. A} commercially available DSA insoluble anode ( IrO ₂ / RuO ₂ -Ti mesh (Jiarong Energy Technology Co., Ltd.) as the anode of OER, and an anion exchange membrane X37-50 (purchased from Dioxide Materials) is sandwiched between the cathode and the catalyst A membrane electrode group is formed. The membrane electrode group was immersed in a 2M KOH solution, and the electrochemical activity test was performed as follows. Scanning voltage range: 1.3 ~ 2.2V, scanning speed is 50mV / s. The current-voltage curve of the above membrane electrode group is shown in FIG. 18, which can generate 10.6A at 2V, and the impedance of the entire test system is 40mΩ. The above-mentioned membrane electrode group has a decay rate per minute of 0.0087%.

Example 7 and Example 8 are compared with the membrane electrode group of Comparative Example 1 as shown in Table 6.

It can be seen from Table 6 that the activities of the Ni _1.5 Nb _0.5 N ₂ catalyst and Ni _1.62 Nb _0.37 C _0.39 catalyst in the examples are much higher than those of the commercially available anode catalysts.

Preparation Example 11

A reactive magnetron sputtering machine was used to deposit a Ni _0.75 Ru _1.25 N ₂ catalyst on a stainless steel mesh (316 stainless steel, 200 mesh, 50 mm × 50 mm). Put the Ni target and Ru target into the sputtering machine, adjust the power applied to the Ni target (150W) and the power of the Ru target (100W), and pass nitrogen and argon into the machine. Nitrogen / ( Argon + Nitrogen) = 50%, and the pressure in the machine is 5mTorr. The Ni target and the Ru target were impacted with argon ions, and reactive sputtering was performed at room temperature for 8 minutes to form a Ni _0.75 Ru _1.25 N ₂ catalyst (confirmed by EDS) with a thickness of about 300 nm on a stainless steel net. The area covered by the catalyst was 0.17 mg / cm ² . Ni _0.75 Ru _1.25 N ₂ catalyst was analyzed by SEM. Its surface morphology was triangular pyramid and quadrangular pyramid. XRD analysis of Ni _0.75 Ru _1.25 N ₂ catalyst, which is cubic or amorphous.

Example 9

Ni _0.75 Ru _1.25 N ₂ -stainless steel mesh of Preparation Example 11 was used as the cathode of HER, Ni _1.5 Nb _0.5 N ₂ -stainless steel mesh of Preparation Example 9 was used as the anode of OER, and anion exchange membrane X37-50 (purchased from Dioxide Materials ) Is sandwiched between the cathode and anode catalyst layers to form a membrane electrode group. The membrane electrode group was immersed in a 2M KOH solution, and the electrochemical activity test was performed as follows. Scanning voltage range: 1.3 ~ 2.2V, scanning speed is 50mV / s. The above membrane electrode group can generate a current of 10.5A at 1.87V, and the impedance of the entire test system is 12mΩ. The above-mentioned membrane electrode group has a decay rate per minute of 0.0057%.

Preparation Example 12

A reactive magnetron sputtering machine was used to deposit Ni _0.75 Ru _1.25 N ₂ catalyst on carbon paper H23C8 (freudenberg, 50mm × 50mm). Put the Ni target and Ru target into the sputtering machine, adjust the power applied to the Ni target (150W) and the power of the Ru target (100W), and pass nitrogen and argon into the machine. Nitrogen / ( Argon + Nitrogen) = 50%, and the pressure in the machine is 5mTorr. Ni target and Ru target were impacted with argon ions, and reactive sputtering was performed at room temperature for 8 minutes to form a Ni _0.75 Ru _1.25 N ₂ catalyst (confirmed by EDS) with a film thickness of about 300 nm on carbon paper H23C8 The catalyst coating amount per unit area was 0.17 mg / cm ² . Ni _0.75 Ru _1.25 N ₂ catalyst was analyzed by SEM. Its surface morphology was triangular pyramid and quadrangular pyramid. XRD analysis of Ni _0.75 Ru _1.25 N ₂ catalyst, which is cubic or amorphous.

Example 10

Take Ni _0.75 Ru _1.25 N ₂ -carbon paper of Preparation Example 12 as the cathode of HER, Ni _1.5 Nb _0.5 N ₂ -Stainless steel mesh of Preparation Example 9 as the anode of OER, and anion exchange membrane X37-50 (purchased from Dioxide Materials ) Is sandwiched between the cathode and anode catalyst layers to form a membrane electrode group. The membrane electrode group was immersed in a 2M KOH solution, and the electrochemical activity test was performed as follows. Scanning voltage range: 1.3 ~ 2.2V, scanning speed is 50mV / s. The current-voltage curve of the above membrane electrode group is shown in FIG. 19, and a current of 10.5A can be generated at 1.96V, and the impedance of the entire test system is 17mΩ. The above-mentioned membrane electrode group has a decay rate per minute of 0.000035%. The potential of the membrane electrode group was controlled to be 2V and the operation was continued for 48 hours, and the current was stable as shown in FIG. 20. In other words, Ni _0.75 Ru _1.25 N ₂ -carbon paper can resist reduction reaction, Ni _1.5 Nb _0.5 N ₂ -stainless steel mesh can resist oxidation reaction, and Ni _0.75 Ru _1.25 N ₂ -carbon paper and Ni _1.5 Nb _0.5 N ₂ -stainless steel mesh Can resist alkali corrosion.

Example 7 and Example 9 are compared with the membrane electrode group of Example 10 as shown in Table 7: Table 7

As can be seen from Table 7, the use of Ni _0.75 Ru _1.25 N ₂ catalyst in the catalyst layer of the cathode can greatly improve the catalyst activity. In addition, when the cathode Ni _0.75 Ru _1.25 N ₂ catalyst is formed on carbon paper, the durability of the membrane electrode group can be further improved.

Although the present disclosure has been disclosed above in several embodiments, it is not intended to limit the present disclosure. Any person with ordinary knowledge in the technical field can make any changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of this disclosure shall be determined by the scope of the appended patent application.

Claims (13)

A membrane electrode group includes: an anode including a first catalyst layer on a first gas-liquid diffusion layer; a cathode including a second catalyst layer on a second gas-liquid diffusion layer; and an anion An exchange membrane is 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 ' _a M " _b N ₂ or M' _c M ” _d C _e , where M ′ is Ni or Co, M” is Nb, 0.7 a 1.7, 0.3 b 1.3, a + b = 2, 0.24 c 1.7, 0.3 d 1.76 and 0.38 e 3.61, where M ' _a M ” _b N ₂ is cubic, and M ′ _c M” _d C _e is cubic or amorphous, and wherein the chemical structure of the second catalyst layer is M _x Ru _y N ₂ or M _x Ru _y , where M is Ni or Mn, 0 <x <1.3, 0.7 <y <2, x + y = 2, M _x Ru _y N ₂ is cubic or amorphous, and M _x Ru _y is a cubic crystal system. The membrane electrode group described in item 1 of the scope of patent application is immersed in an alkaline aqueous solution. The membrane electrode group according to item 1 of the scope of patent application, wherein the chemical structure of the first catalyst layer is Ni _a Nb _b N ₂ , 0.7 a 1.51, and 0.49 b 1.30. The membrane electrode group according to item 1 of the scope of patent application, wherein the chemical structure of the first catalyst layer is Ni _c Nb _d C _e , 0.90 c 1.47, 0.53 d 1.10 and 0.9 e 1.9. The membrane electrode group according to item 1 of the scope of patent application, wherein the chemical structure of the first catalyst layer is Ni _c Nb _d C _e , 0.74 c 1.63, 0.37 d 1.26 and 0.38 e 1.30. The membrane electrode group according to item 1 of the scope of patent application, wherein the chemical structure of the first catalyst layer is Co _c Nb _d C _e , 0.24 c 1.39, 0.61 d 1.76 and 0.63 e 3.61. The membrane electrode group according to item 1 of the patent application scope, wherein each of the first gas-liquid diffusion layer and the second gas-liquid diffusion layer includes a porous conductive layer. The membrane electrode assembly according to item 1 of the scope of the patent application, 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. The membrane electrode assembly according to item 7 of the application, wherein the pore diameter of the first gas-liquid diffusion layer is between 40 microns and 150 microns, and the pore diameter of the second gas-liquid diffusion layer is between 0.5 microns and 5 Between micrometers. A method for electrolytic hydrogen production, comprising: immersing a membrane electrode group in an alkaline aqueous solution, wherein the membrane electrode group includes: an anode including a first catalyst layer on a first gas-liquid diffusion layer; A cathode includes a second catalyst layer on a 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 ' _a M " _b N ₂ or M' _c M" _d C _e , where M 'is Ni or Co, and M "is Nb, 0.7 a 1.7, 0.3 b 1.3, a + b = 2, 0.24 c 1.7, 0.3 d 1.76 and 0.38 e 3.61, where M ' _a M ” _b N ₂ is cubic, and M ′ _c M” _d C _e is cubic or amorphous, and wherein the chemical structure of the second catalyst layer is M _x Ru _y N ₂ or M _x Ru _y , where M is Ni or Mn, 0 <x <1.3, 0.7 <y <2, x + y = 2, M _x Ru _y N ₂ is cubic or amorphous, and M _x Ru _y is a cubic crystal system; and a potential is applied to the anode and the cathode to electrolyze the alkaline aqueous solution so that the cathode generates hydrogen and the anode generates oxygen. The method for electrolytic hydrogen production according to item 10 of the application, wherein the first gas-liquid diffusion layer and the second gas-liquid diffusion layer each include a porous conductive layer. According to the method of electrolytic hydrogen production described in item 10 of the scope of the patent application, 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. The method for electrolytic hydrogen production according to item 10 of the application, wherein the pore diameter of the first gas-liquid diffusion layer is between 40 microns and 150 microns, and the pore diameter of the second gas-liquid diffusion layer is between 0.5 microns To 5 microns.