A Co-IrRu / C anti-polarization catalyst and its preparation method

Abstract

The present invention relates to a Co-IrRu / C anti-reversal catalyst and a preparation method thereof. The technical solution is as follows: using a substance containing Ir, a substance containing Ru, a substance containing Co, and a C carrier as raw materials, proportioning according to the molar ratio of Ir∶Ru∶Co∶C being 1∶(1-2)∶(0.5-1)∶(0.8-1), adding ethylene glycol to the raw materials and stirring to obtain Solution I; adding sodium hydroxide to Solution I and stirring to obtain Solution II; reacting Solution II at 140-160°C for 5-7 h, adjusting the pH value to 1-2; then performing centrifugal separation, taking the lower-layer precipitate, drying, and heat-treating it in a nitrogen-hydrogen mixed atmosphere at 200-400°C for 1-3 h to prepare the Co-IrRu / C anti-reversal catalyst. The present invention has the characteristics of low cost, simple process, short production cycle, and environmental friendliness. The prepared Co-IrRu / C anti-reversal catalyst has high purity, stable quality, good MEA performance, and excellent anti-reversal performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of anti-reversal catalysts. Specifically, it relates to a Co-IrRu / C anti-reversal catalyst and a preparation method thereof. Background Art

[0002] A proton exchange membrane fuel cell (PEMFC) directly converts the chemical energy of hydrogen fuel into electrical energy and is considered a promising energy conversion device due to its high energy density, high conversion efficiency, and zero CO2 emissions. However, despite the advantages of PEMFC and significant progress, durability remains one of the key challenges for PEMFC commercialization.

[0003] During the operation of a PEMFC, sudden changes in reactant demand caused by conditions such as frequent startups and rapid load changes will lead to a lack of hydrogen at the anode. The anode potential exceeds the cathode potential, and the cell voltage becomes negative, which is called cell reversal. Under cell reversal conditions, the anode catalyst (Pt / C) undergoes a carbon oxidation reaction, and the anode will be severely damaged; the Pt catalyst will fall off the carbon support; the thinning of the carbon support layer and the collapse of the pore structure will cause mass transfer problems. Eventually, the performance of the PEMFC will drop catastrophically. In particular, the uneven distribution of the strong heat accompanying carbon oxidation will lead to pinholes in the proton exchange membrane, which may cause a mixture of reaction gases (H2 and O2) and subsequently lead to fire or explosion. Therefore, cell reversal has attracted the attention of those skilled in the art regarding the durability and operational safety of PEMFCs.

[0004] For example, Jieqiong Shan et al. (Shan J, Ling T, Davey K, et al. Transition-metal-doped RuIr bifunctional nanocrystals for overall water splitting in acidic environments[J]. Advanced Materials, 2019, 31(17): 1900510.) used the traditional polyol reduction method to prepare IrRu / C nanoparticle powder. The traditional polyol reduction method uses stabilizers such as PVP to synthesize IrRu alloy nanoparticles. However, the addition of stabilizers such as PVP easily causes agglomeration of metal nanoparticles, affecting the electrochemical performance. Moreover, PVP is difficult to clean, increasing the difficulty of subsequent catalyst preparation, increasing the production cycle, and hindering the promotion of commercial production.

[0005] As Jiang Y et al. (Jiang Y, Mao Y, Jiang Y, et al. Atomic equidistributionaenhanced RuIr electrocatalysts for overall water splitting in the whole pHrange[J]. Chemical Engineering Journal, 2022, 450:137909.) used sodium borohydride as a reducing agent to directly reduce metal precursors to synthesize IrRu / C nanoparticle powders at room temperature. During the experiment of the sodium borohydride reduction method, a sodium borohydride solution needs to be synthesized, and the rate of adding sodium borohydride to water needs to be controlled. If the addition rate of sodium borohydride is too fast, it is easy for sodium borohydride to react with water. Moreover, when the sodium borohydride solution is added to the precursor solution, if the addition rate is too fast, the generated metal nanoparticles will agglomerate severely, reducing the electrochemical performance. Therefore, there are many influencing factors to be considered during the experiment of the sodium borohydride reduction method, the influencing factors are uncontrollable, and the quality is unstable.

[0006] As Qin B et al. (Qin B, Yu H, Gao X, et al. Ultrathin IrRu nanowire networkswith high performance and durability for the hydrogen oxidation reaction inalkaline anion exchange membrane fuel cells[J]. Journal of Materials ChemistryA, 2018, 6(41):20374-20382.) developed a new method for preparing IrRu / C nanoparticle powders. This method uses the microemulsion method to prepare IrRu / C nanoparticle powders. However, the microemulsion method uses organic solvents such as 1-hexane and 1-hexanol. Hexanes are extremely flammable, will undergo substitution reactions with halogens, and hexanes have certain toxicity. Long-term exposure can cause chronic poisoning in humans, and in severe cases, it can even cause people to faint, fall into a coma, and even die. The requirements for the production environment and equipment are very high. Summary of the Invention

[0007] The present invention aims to overcome the defects of the prior art. The purpose is to provide a preparation method of Co-IrRu / C anti-reversal catalyst with low cost, simple process, short production cycle, and environmental friendliness. The Co-IrRu / C anti-reversal catalyst prepared by this method has high purity, stable quality, excellent MEA performance, and excellent anti-reversal performance.

[0008] In order to accomplish the above tasks, the technical solution adopted by the present invention is:

[0009] Step 1, using Ir-containing material, Ru-containing material, Co-containing material and C carrier as raw materials, and preparing the materials according to the molar ratio of Ir:Ru:Co:C of 1:(1-2):(0.5-1):(0.8-1); then adding ethylene glycol to the raw materials according to the mass ratio of the raw materials:ethylene glycol of 1:(20-25), stirring at room temperature for 20-30 minutes, and obtaining solution I.

[0010] Step 2: adding sodium hydroxide to the solution I at a molar ratio of sodium hydroxide to the raw material of 0.5:1, and stirring for 20 to 30 minutes to obtain a solution II.

[0011] Step 3, transfer the solution II to a high temperature circulation reactor and react at 140-160°C for 5-7h; adjust the pH value of the solution II after the reaction to 1-2 with an acid compound; then centrifuge at 8000-10000 r / min, remove the lower precipitate, and dry it at 70-90°C for 10-14h to obtain a precursor powder.

[0012] Step 4: heat-treating the precursor powder in a nitrogen-hydrogen mixed atmosphere at 200-400° C. for 1-3 hours to obtain a Co-IrRu / C anti-reverse polarity catalyst.

[0013] The Ir-containing substance is iridium chloride or chloroiridic acid; the purity of the Ir-containing substance is ≥99.8%.

[0014] The Ru-containing substance is ruthenium chloride or ruthenium acetate; the purity of the Ru-containing substance is ≥99.8%.

[0015] The Co-containing substance is one of cobalt chloride, cobalt nitrate and cobalt carbonate; the purity of the Co-containing substance is ≥99.8%.

[0016] The C carrier has a specific surface area of ​​400 to 600 m 2 / g of conductive carbon black; the purity of the conductive carbon black is ≥99.8%.

[0017] The acid compound is one of hydrochloric acid, nitric acid and sulfuric acid.

[0018] In the nitrogen-hydrogen mixed atmosphere, hydrogen accounts for 15 vol% and nitrogen accounts for 95 vol%.

[0019] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0020] 1. The present invention uses an Ir-containing substance, a Ru-containing substance, a Co-containing substance, and a C support as raw materials, adds ethylene glycol, then adds sodium hydroxide thereto, stirs, and adjusts the pH to 1-2 with an acid compound; performs centrifugal separation, dries the obtained lower-layer precipitate, and performs heat treatment at 200-400 °C for 1-3 h under a nitrogen-hydrogen mixed atmosphere to obtain a Co-IrRu / C anti-reversal catalyst. The process is simple, has a short production cycle, low production cost, and is environmentally friendly.

[0021] 2. The present invention synthesizes a Co-IrRu / C anti-reversal catalyst by an improved polyol reduction method. During the preparation process, sodium hydroxide can well control the nucleation and growth of Co-IrRu / C nanoparticles; in the heating reaction, ethylene glycol acts as a reducing agent to reduce the metal precursor into nanoparticles. After the reaction is completed, an acid compound is added to destroy the alkaline environment, and the metal nanoparticles are deposited on the surface of the carbon support through electrostatic adsorption, providing a stable nucleation and growth environment, and the product quality is stable.

[0022] 3. The existing polyol reduction method uses PVP as a stabilizer to synthesize IrRu / C alloy nanoparticles, but the addition of PVP will affect the purity of the product, increase the cleaning difficulty of the subsequent IrRu / C nanoparticle powder, increase the cost of batch production, and is not suitable for large-scale batch production; while the present invention controls the nucleation-growth of alloy nanoparticles under the condition of sodium hydroxide, which not only simplifies the production scheme, reduces the production cost, but also improves the purity of the product, and has the potential for batch production.

[0023] 4. The existing technology for preparing IrRu / C uses double noble metals, which not only has a high cost, but also has a low OER catalytic activity. The doping of the transition metal Co used in the present invention reduces the use of noble metals, reduces the production cost of the catalyst, and at the same time enhances the HOR and OER catalytic activities of IrRu / C. Co-IrRu / C has excellent bifunctional properties.

[0024] 5. The Co-IrRu / C anti-reversal catalyst prepared by the present invention has bifunctional properties. Under three-electrode conditions, the HOR performance is 7.88 mA / cm 2 @25 mV, and the OER performance is 248 mV@10 mA / cm 2 ; under single-cell conditions, the membrane electrode (MEA) performance is 0.466 V@2 A / cm 2 , and the anti-reversal time is 14.9 min, having good MEA performance and excellent anti-reversal performance, which is greatly improved compared with the commercial Pt / C catalyst.

[0025] Therefore, the present invention has the characteristics of low cost, simple process, short production cycle and environmental friendliness, and the prepared Co-IrRu / C anti-reverse polarity catalyst has high purity, stable quality, good MEA performance and excellent anti-reverse polarity performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The XRD spectrum of a Co-IrRu / C anti-reversal catalyst prepared by the present invention;

[0027] Figure 2 yes Figure 1 TEM image of Co-IrRu / C anti-reversal catalyst shown;

[0028] Figure 3 for Figure 1 LSV curve of HOR of Co-IrRu / C anti-reversal catalyst shown;

[0029] Figure 4 for Figure 1 LSV curve of OER of Co-IrRu / C anti-reversal catalyst shown;

[0030] Figure 5 for Figure 1 The MEA performance diagram of Co-IrRu / C anti-reversal catalyst is shown;

[0031] Figure 6 for Figure 1 The anti-reversal performance diagram of Co-IrRu / C anti-reversal catalyst is shown. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific methods, which does not limit the protection scope of the present invention.

[0033] A Co-IrRu / C anti-reversal catalyst and a preparation method thereof. The steps of the preparation method described in this specific embodiment are:

[0034] Step 1, using Ir-containing material, Ru-containing material, Co-containing material and C carrier as raw materials, and preparing the materials according to the molar ratio of Ir:Ru:Co:C of 1:(1-2):(0.5-1):(0.8-1); then adding ethylene glycol to the raw materials according to the mass ratio of the raw materials:ethylene glycol of 1:(20-25), stirring at room temperature for 20-30 minutes, and obtaining solution I.

[0035] Step 2: adding sodium hydroxide to the solution I at a molar ratio of sodium hydroxide to the raw material of 0.5:1, and stirring for 20 to 30 minutes to obtain a solution II.

[0036] Step 3: Transfer the solution II into a high-temperature circulating reactor, react at 140 - 160 °C for 5 - 7 h; then adjust the pH value of the reacted solution II to 1 - 2 with an acid compound; then centrifuge at 8000 - 10000 r / min, take the lower precipitate, and dry it at 70 - 90 °C for 10 - 14 h to obtain the precursor powder.

[0037] Step 4: Heat-treat the precursor powder in a nitrogen-hydrogen mixed atmosphere at 200 - 400 °C for 1 - 3 h to prepare the Co-IrRu / C anti-reverse electrode catalyst.

[0038] The Ir-containing substance is iridium chloride or chloroiridic acid.

[0039] The Ru-containing substance is ruthenium chloride or ruthenium acetate.

[0040] The Co-containing substance is one of cobalt chloride, cobalt nitrate, and cobalt carbonate.

[0041] The acid compound is one of hydrochloric acid, nitric acid, and sulfuric acid.

[0042] In this specific embodiment:

[0043] The purity of the Ir-containing substance ≥ 99.8%.

[0044] The purity of the Ru-containing substance ≥ 99.8%.

[0045] The purity of the Co-containing substance ≥ 99.8%.

[0046] The C carrier is conductive carbon black with a specific surface area of 400 - 600 m 2 / g; the purity of the conductive carbon black ≥ 99.8%.

[0047] In the nitrogen-hydrogen mixed atmosphere: hydrogen is 15 vol%; nitrogen is 95 vol%.

[0048] Details are not described again in the examples.

[0049] Example 1

[0050] A Co-IrRu / C anti-reverse electrode catalyst and its preparation method. The specific steps of the preparation method in this example:

[0051] Step 1: Using an Ir-containing substance, a Ru-containing substance, a Co-containing substance, and a C carrier as raw materials, proportion them according to the molar ratio of Ir∶Ru∶Co∶C of 1∶1∶0.5∶0.8; then according to the mass ratio of the raw materials∶ethylene glycol of 1∶20, add ethylene glycol to the raw materials and stir at room temperature for 20 min to obtain solution I.

[0052] Step 2: adding sodium hydroxide to the solution I at a molar ratio of sodium hydroxide to the raw material of 0.5:1, and stirring for 20 minutes to obtain solution II.

[0053] Step 3, move the solution II into a high-temperature circulation reactor and react at 140°C for 5 hours; then adjust the pH value of the solution II after the reaction to 2 with an acid compound; then centrifuge at 8000r / min, remove the lower layer of precipitate, and dry it at 70°C for 10 hours to obtain the precursor powder.

[0054] Step 4: heat-treating the precursor powder in a nitrogen-hydrogen mixed atmosphere at 200° C. for 1 h to obtain a Co-IrRu / C anti-reverse polarity catalyst.

[0055] The Ir-containing substance is iridium chloride.

[0056] The Ru-containing substance is ruthenium chloride.

[0057] The Co-containing substance is cobalt chloride.

[0058] The acid compound is hydrochloric acid.

[0059] The Co-IrRu / C anti-reversal catalyst prepared in this example was tested: the HOR performance was 7.88 mA / cm 2 @25mV; OER performance is 248mV@10mA / cm 2 ; MEA performance is 0.466V@2A / cm 2 ; The anti-reverse polarity time is 14.9min.

[0060] Example 2

[0061] A Co-IrRu / C anti-reversal polarity catalyst and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0062] Step 1: Using Ir-containing substance, Ru-containing substance, Co-containing substance and C carrier as raw materials, the ingredients are prepared according to the molar ratio of Ir:Ru:Co:C of 1:1.2:0.7:0.9; then adding ethylene glycol to the raw materials according to the mass ratio of the raw materials:ethylene glycol of 1:22, stirring at room temperature for 25 minutes to obtain solution I.

[0063] Step 2: adding sodium hydroxide to the solution I at a molar ratio of sodium hydroxide to the raw material of 0.5:1, and stirring for 25 minutes to obtain solution II.

[0064] Step 3: Transfer the Solution II into a high-temperature circulating reactor, react at 140 °C for 6 h; then adjust the pH value of the reacted Solution II to 2 with an acid compound; then centrifuge at 9000 r / min, take the lower precipitate, and dry it at 70 °C for 12 h to obtain the precursor powder.

[0065] Step 4: Heat-treat the precursor powder under a nitrogen-hydrogen mixed atmosphere at 200 °C for 2 h to prepare the Co-IrRu / C anti-reversal catalyst.

[0066] The Ir-containing substance is chloroiridic acid.

[0067] The Ru-containing substance is ruthenium acetate.

[0068] The Co-containing substance is cobalt nitrate.

[0069] The acid compound is hydrochloric acid.

[0070] The Co-IrRu / C anti-reversal catalyst prepared in this example was tested: the HOR performance was 7.70 mA / cm 2 @ 25 mV; the OER performance was 280 mV @ 10 mA / cm 2 ; the MEA performance was 0.456 V @ 2 A / cm 2 ; the anti-reversal time was 10 min.

[0071] Example 3

[0072] A Co-IrRu / C anti-reversal catalyst and its preparation method. The specific steps of the preparation method in this example are as follows:

[0073] Step 1: Using an Ir-containing substance, a Ru-containing substance, a Co-containing substance, and a C support as raw materials, proportion them according to the molar ratio of Ir:Ru:Co:C of 1:2:0.8:1; then according to the mass ratio of the raw materials:ethylene glycol of 1:23, add ethylene glycol to the raw materials and stir at room temperature for 27 min to obtain Solution I.

[0074] Step 2: According to the molar ratio of sodium hydroxide:the raw materials of 0.5:1, add the sodium hydroxide to the Solution I and stir for 27 min to obtain Solution II.

[0075] Step 3: Transfer the Solution II into a high-temperature circulating reactor, react at 150 °C for 6 h; then adjust the pH value of the reacted Solution II to 1 with an acid compound; then centrifuge at 9000 r / min, take the lower precipitate, and dry it at 80 °C for 12 h to obtain the precursor powder.

[0076] Step 4: heat-treating the precursor powder in a nitrogen-hydrogen mixed atmosphere at 300° C. for 3 h to obtain a Co-IrRu / C anti-reverse polarity catalyst.

[0077] The Ir-containing substance is iridium chloride.

[0078] The Ru-containing substance is ruthenium acetate.

[0079] The Co-containing substance is cobalt carbonate.

[0080] The acid compound is sulfuric acid.

[0081] The Co-IrRu / C anti-reversal catalyst prepared in this example was tested: the HOR performance was 7.72 mA / cm 2 @25mV; OER performance is 265mV@10mA / cm 2 ; MEA performance is 0.458V@2A / cm 2 ; The anti-reverse polarity time is 14 minutes.

[0082] Example 4

[0083] A Co-IrRu / C anti-reversal polarity catalyst and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0084] Step 1: Using Ir-containing material, Ru-containing material, Co-containing material and C carrier as raw materials, the ingredients are prepared according to the molar ratio of Ir:Ru:Co:C of 1:2:1:1; then adding ethylene glycol to the raw materials according to the mass ratio of the raw materials:ethylene glycol of 1:25, stirring at room temperature for 30 minutes to obtain solution I.

[0085] Step 2: adding sodium hydroxide to the solution I at a molar ratio of sodium hydroxide to the raw material of 0.5:1, and stirring for 30 minutes to obtain solution II.

[0086] Step 3, move the solution II into a high-temperature circulation reactor and react at 160°C for 7 hours; then adjust the pH value of the solution II after the reaction to 1 with an acid compound; then centrifuge at 10000r / min, remove the lower layer of precipitate, and dry it at 90°C for 14 hours to obtain the precursor powder.

[0087] Step 4: heat-treating the precursor powder in a nitrogen-hydrogen mixed atmosphere at 400° C. for 3 h to obtain a Co-IrRu / C anti-reverse polarity catalyst.

[0088] The Ir-containing substance is chloroiridic acid.

[0089] The Ru-containing substance is ruthenium chloride.

[0090] The Co-containing substance is cobalt chloride.

[0091] The acid compound is nitric acid.

[0092] The Co-IrRu / C anti-reversal catalyst prepared in this example was tested: the HOR performance was 7.80 mA / cm 2 @ 25 mV; the OER performance was 275 mV @ 10 mA / cm 2 ; the MEA performance was 0.459 V @ 2 A / cm 2 ; the anti-reversal time was 12.5 min.

[0093] The following beneficial effects are achieved when this specific embodiment is compared with the prior art:

[0094] 1. This specific embodiment uses substances containing Ir, Ru, Co, and a C carrier as raw materials, adds ethylene glycol, then adds sodium hydroxide thereto, stirs, and adjusts the pH to 1-2 with an acid compound; centrifuges and separates, dries the obtained lower-layer precipitate, and heat-treats it for 1-3 h under a nitrogen-hydrogen mixed atmosphere and at 200-400 °C to prepare the Co-IrRu / C anti-reversal catalyst. The process is simple, the production cycle is short, the production cost is low, and it is environmentally friendly.

[0095] 2. This specific embodiment synthesizes the Co-IrRu / C anti-reversal catalyst by an improved polyol reduction method. During the preparation process, sodium hydroxide can well control the nucleation and growth of Co-IrRu / C nanoparticles; in the heating reaction, ethylene glycol acts as a reducing agent to reduce the metal precursor into nanoparticles. After the reaction is completed, an acid compound is added to destroy the alkaline environment, and the metal nanoparticles are deposited on the surface of the carbon carrier through electrostatic adsorption, providing a stable nucleation and growth environment, and the product quality is stable.

[0096] 3. The existing polyol reduction method uses PVP as a stabilizer to synthesize IrRu / C alloy nanoparticles, but the addition of PVP will affect the purity of the product, increase the cleaning difficulty of the subsequent IrRu / C nanoparticle powder, increase the cost of batch production, and is not suitable for large-scale batch production; while this specific embodiment controls the nucleation-growth of alloy nanoparticles under the condition of sodium hydroxide, which not only simplifies the production scheme, reduces the production cost, but also improves the purity of the product and has the potential for batch production.

[0097] 4. The existing technology for preparing IrRu / C uses double precious metals, which not only has a high cost but also has a low OER catalytic activity. The doping of the transition metal Co used in this specific embodiment reduces the use of precious metals, reduces the production cost of the catalyst, and at the same time enhances the HOR and OER catalytic activities of IrRu / C. Co-IrRu / C has excellent bifunctional performance.

[0098] 5. The Co-IrRu / C anti-reversal catalyst prepared in this specific embodiment is shown in the attached drawings: Figure 1 is the XRD pattern of the Co-IrRu / C anti-reversal catalyst prepared in Example 1; Figure 2 is Figure 1 the TEM image of the Co-IrRu / C anti-reversal catalyst shown; Figure 3 is Figure 1 the LSV curve of HOR of the Co-IrRu / C anti-reversal catalyst shown; Figure 4 is Figure 1 the LSV curve of OER of the Co-IrRu / C anti-reversal catalyst shown; Figure 5 is Figure 1 the MEA performance diagram of the Co-IrRu / C anti-reversal catalyst shown; Figure 6 is Figure 1 the anti-reversal performance diagram of the Co-IrRu / C anti-reversal catalyst shown. It can be seen from Figure 1 that the main peak at about 44.6° is between the (200) plane of body-centered cubic (bcc) Ir (JCPDS Card No. 06-0598) and the (101) plane of hexagonal close-packed (hcp) Ru (JCPDS Card No. 06-0663), which clearly confirms that IrRu / C has formed a good alloy bimetallic structure. With the doping of the transition metal element Co, the main peak at about 44.6° shows a weak shift, causing lattice distortion of IrRu / C, proving the successful synthesis of the Co-IrRu / C anti-reversal catalyst. It can be seen from Figure 2 that Co-IrRu nanoparticles are uniformly dispersed on the carbon support without obvious agglomeration. It can be seen from Figure 3 that according to the Koutecky-Levich equation estimation, the dynamic current densities of HOR of Co-IrRu / C, IrRu / C and Pt / C at 25 mV are 7.88, 7.24 and 7.76 mA / cm 2 . The results show that the HOR activity of the Co-IrRu / C catalyst is better than that of the IrRu / C catalyst, and even the HOR activity of the Co-IrRu / C catalyst is better than that of Pt / C. It can be seen from Figure 4 that the LSV curve shows that the overpotentials of Co-IrRu / C, IrRu / C and IrO2 are 248, 326 and 356 mV in turn; it can be seen that the OER activity of all Co-IrRu / C catalysts is better than that of IrRu / C and IrO2 catalysts, and the OER activity of the Co-IrRu / C catalyst is the highest. It can be seen from Figure 5 that the HOR activity of the Co-IrRu / C catalyst was tested in a single cell under fuel cell conditions: at 2 A / cm 2Under the conditions of 341K and 100%RH, the MEA performance of Co-IrRu / C (0.466V), Pt / C (0.425V), and IrRu / C (0.402V) decreases in sequence. The maximum power density of Co-IrRu / C under the conditions of 341K and 100%RH is 959.4mW / cm 2 , much higher than that of IrRu / C (805.3mW / cm 2 ) and Pt / C (852.4mW / cm 2 ). It is proved that the HOR activity of Co-IrRu / C catalyst under single cell conditions is better than that of IrRu / C and Pt / C catalysts, which is consistent with the Figure 3 HOR electrochemical test results. As can be seen from Figure 6 , the anti-polarization performance of Co-IrRu / C is 14.9min, which is 1.4 times that of IrRu / C (10.6min) and 20 times that of Pt / C (0.75min). That is, the prepared Co-IrRu / C has excellent anti-polarization performance, which is consistent with the Figure 4 OER test results.

[0099] 6. The Co-IrRu / C anti-polarization catalyst prepared in this specific embodiment has bifunctional performance. Under three-electrode conditions, the HOR performance is 7.88mA / cm 2 @25mV, and the OER performance is 248mV@10mA / cm 2 ; under single cell conditions, the membrane electrode (MEA) performance is 0.466V@2A / cm 2 , and the anti-polarization time is 14.9min. It has good MEA performance and excellent anti-polarization performance, showing a significant improvement compared with the commercial Pt / C catalyst.

[0100] Therefore, this specific embodiment has the characteristics of low cost, simple process, short production cycle, and environmental friendliness. The prepared Co-IrRu / C anti-polarization catalyst has high purity, stable quality, good MEA performance, and excellent anti-polarization performance.

Claims

1. A preparation method of a Co-IrRu / C anti-reverse electrode catalyst, characterized in that The specific steps of the preparation method are: Step 1, using an Ir-containing substance, a Ru-containing substance, a Co-containing substance and a C carrier as raw materials, and preparing the ingredients according to a molar ratio of Ir:Ru:Co:C of 1:(1-2):(0.5-1):(0.8-1); then adding ethylene glycol to the raw materials according to a mass ratio of the raw materials:ethylene glycol of 1:(20-25), stirring at room temperature for 20-30 minutes, to obtain a solution I; Step 2, adding the sodium hydroxide to the solution I at a molar ratio of sodium hydroxide to the raw material of 0.5:1, and stirring for 20 to 30 minutes to obtain a solution II; Step 3, the solution II is transferred to a high temperature circulation reactor, and reacted at 140-160° C. for 5-7 hours; the pH value of the solution II after the reaction is adjusted to 1-2 with an acid compound; and then centrifuged at 8000-10000 r / min, the lower precipitate is removed, and dried at 70-90° C. for 10-14 hours to obtain a precursor powder; Step 4, heat treating the precursor powder in a nitrogen-hydrogen mixed atmosphere at 200-400° C. for 1-3 hours to obtain a Co-IrRu / C anti-reversal catalyst; The Ir-containing substance is iridium chloride or chloroiridic acid; the purity of the Ir-containing substance is ≥99.8%; The Ru-containing substance is ruthenium chloride or ruthenium acetate; the purity of the Ru-containing substance is ≥99.8%; The Co-containing substance is one of cobalt chloride, cobalt nitrate and cobalt carbonate; the purity of the Co-containing substance is ≥99.8%; The C carrier is conductive carbon black with a specific surface area of 400 to 600 m 2 / g; the purity of the conductive carbon black is ≥99.8%; The acid compound is one of hydrochloric acid, nitric acid and sulfuric acid; In the nitrogen-hydrogen mixed atmosphere, hydrogen accounts for 15 vol% and nitrogen accounts for 95 vol%.

2. A Co-IrRu / C anti-polarization catalyst, characterized in that The Co-IrRu / C anti-reversal catalyst is a Co-IrRu / C anti-reversal catalyst prepared according to the preparation method of the Co-IrRu / C anti-reversal catalyst according to claim 1.

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