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CN-122006781-A - Bimetallic nitride catalyst and preparation method and application thereof

CN122006781ACN 122006781 ACN122006781 ACN 122006781ACN-122006781-A

Abstract

The invention provides a bimetallic nitride catalyst and a preparation method and application thereof, and relates to the technical field of catalysts, wherein the preparation method comprises the steps of adding ferric nitrate and soluble starch into water, stirring until the mixture is gelatinized to obtain gelatinized liquid, adding zinc nitrate, dicyandiamide and cobalt nitrate into the gelatinized liquid, stirring uniformly to obtain hydrogel, freeze-drying the hydrogel to obtain aerogel, and placing the aerogel in an ammonia atmosphere, and preserving the temperature of the aerogel for 2-6H at 850-950 ℃ to obtain the bimetallic nitride catalyst containing iron cobalt nitride, wherein the bimetallic nitride catalyst has high oxygen reduction reaction activity and cycle stability.

Inventors

  • HUI ZHENZHEN
  • WANG XUCHUN
  • WANG YANPING
  • ZUO XUZHONG
  • LI GANG
  • KE XIANG
  • LI WANYUN
  • SHI YINGDI
  • YE XIANGJIE
  • LI ZIRONG

Assignees

  • 安徽科技学院
  • 中建材玻璃新材料研究院集团有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. A method for preparing a bimetallic nitride catalyst, comprising the steps of: adding ferric nitrate and soluble starch into water, and stirring until gelatinization to obtain gelatinized liquid; Zinc nitrate, dicyandiamide and cobalt nitrate are added into the pasting liquid and stirred uniformly to obtain hydrogel; freeze-drying the hydrogel to obtain aerogel; and placing the aerogel in an ammonia atmosphere, and preserving heat for 2-6H at the temperature of 850-950 ℃ to obtain the bimetallic nitride catalyst containing the iron cobalt nitride.
  2. 2. The method for preparing a bimetallic nitride catalyst according to claim 1, wherein the step of placing the aerogel in an ammonia atmosphere and maintaining the temperature at 850-950 ℃ for 2-6H to obtain the bimetallic nitride catalyst containing iron cobalt nitride comprises the following steps: And placing the aerogel in an ammonia atmosphere, and preserving heat for 6H at the temperature of 850 ℃ to obtain the bimetallic nitride catalyst containing the iron cobalt nitride.
  3. 3. The method for preparing a bimetallic nitride catalyst according to claim 1, wherein the mass ratio of ferric nitrate, soluble starch, zinc nitrate, dicyandiamide and cobalt nitrate is (0.1-0.15): 1-3): 1-1.5): 3-5: 0.01-0.05.
  4. 4. A method of preparing a bimetallic nitride catalyst according to claim 3, wherein the mass ratio of ferric nitrate, soluble starch, zinc nitrate, dicyandiamide and cobalt nitrate is 0.1212:2:1.19:4:0.0291.
  5. 5. The method for preparing a bimetallic nitride catalyst according to claim 1, wherein the step of placing the aerogel in an ammonia atmosphere and maintaining the temperature at 850-950 ℃ for 2-6H to obtain the bimetallic nitride catalyst containing iron cobalt nitride comprises the following steps: Placing aerogel in an ammonia atmosphere, heating to 400-450 ℃ at the speed of 1-1.5 ℃ per minute, heating to 550-650 ℃ at the speed of 2-2.5 ℃ per minute, heating to 850-950 ℃ at the speed of 3-3.5 ℃ per minute, and preserving heat for 2-6H to obtain the bimetallic nitride catalyst containing iron cobalt nitride.
  6. 6. The method for preparing a bimetallic nitride catalyst according to claim 5, wherein the step of placing the aerogel in an ammonia atmosphere and maintaining the temperature at 850-950 ℃ for 2-6H to obtain the bimetallic nitride catalyst containing iron cobalt nitride comprises the following steps: Placing aerogel in an ammonia atmosphere, heating to 425 ℃ at a rate of 1 ℃ per minute, heating to 600 ℃ at a rate of 2 ℃ per minute, heating to 850-950 ℃ at a rate of 3 ℃ per minute, and preserving heat for 2-6H to obtain the bimetallic nitride catalyst containing the iron cobalt nitride.
  7. 7. The method for preparing a bimetallic nitride catalyst according to claim 1, wherein the freeze-drying the hydrogel to obtain aerogel comprises: And freeze-drying the hydrogel for 30-40 hours at the temperature of- (40-45) DEG C to obtain the aerogel.
  8. 8. The method for preparing a bimetallic nitride catalyst according to claim 1, wherein the mass to volume ratio of the soluble starch to the water is 1 (20-25) g/mL.
  9. 9. A bimetallic nitride catalyst prepared by the method of preparing a bimetallic nitride catalyst of any one of claims 1-8.
  10. 10. Use of the bimetallic nitride catalyst of claim 9 in a zinc air cell cathode oxygen reduction reaction.

Description

Bimetallic nitride catalyst and preparation method and application thereof Technical Field The application relates to the technical field of catalysts, in particular to a bimetallic nitride catalyst and a preparation method and application thereof. Background The catalyst adopted in the oxygen reduction reaction of the cathode of the zinc-air battery is generally difficult to realize uniform dispersion of metal active sites in a carbon skeleton, and the problems of agglomeration and dissolution of metal particles are easy to occur, so that the oxygen reduction reaction activity and the circulation stability of the catalyst are still to be improved, and the actual application requirements are difficult to meet. Disclosure of Invention In view of the above, the application aims to provide a bimetallic nitride catalyst and a preparation method and application thereof, so as to solve the problems of low oxygen reduction reaction activity and low cycling stability of the existing catalyst for the oxygen reduction reaction of the cathode of the zinc-air battery. Based on the above object, the present application provides a preparation method of a bimetallic nitride catalyst comprising the steps of: adding ferric nitrate and soluble starch into water, and stirring until gelatinization to obtain gelatinized liquid; Zinc nitrate, dicyandiamide and cobalt nitrate are added into the pasting liquid and stirred uniformly to obtain hydrogel; freeze-drying the hydrogel to obtain aerogel; and placing the aerogel in an ammonia atmosphere, and preserving heat for 2-6H at the temperature of 850-950 ℃ to obtain the bimetallic nitride catalyst containing the iron cobalt nitride. Optionally, the aerogel is placed in an ammonia atmosphere, and is kept at a temperature of 850-950 ℃ for 2-6H, so as to obtain the bimetallic nitride catalyst containing the iron cobalt nitride, which comprises the following steps: And placing the aerogel in an ammonia atmosphere, and preserving heat for 6H at the temperature of 850 ℃ to obtain the bimetallic nitride catalyst containing the iron cobalt nitride. Optionally, the mass ratio of the ferric nitrate to the soluble starch to the zinc nitrate to the dicyandiamide to the cobalt nitrate is (0.1-0.15), 1-3, 1-1.5, 3-5 and 0.01-0.05. Optionally, the mass ratio of the ferric nitrate, the soluble starch, the zinc nitrate, the dicyandiamide and the cobalt nitrate is 0.1212:2:1.19:4:0.0291. Optionally, the aerogel is placed in an ammonia atmosphere, and is kept at a temperature of 850-950 ℃ for 2-6H, so as to obtain the bimetallic nitride catalyst containing the iron cobalt nitride, which comprises the following steps: Placing aerogel in an ammonia atmosphere, heating to 400-450 ℃ at the speed of 1-1.5 ℃ per minute, heating to 550-650 ℃ at the speed of 2-2.5 ℃ per minute, heating to 850-950 ℃ at the speed of 3-3.5 ℃ per minute, and preserving heat for 2-6H to obtain the bimetallic nitride catalyst containing iron cobalt nitride. Optionally, the aerogel is placed in an ammonia atmosphere, and is kept at a temperature of 850-950 ℃ for 2-6H, so as to obtain the bimetallic nitride catalyst containing the iron cobalt nitride, which comprises the following steps: Placing aerogel in an ammonia atmosphere, heating to 425 ℃ at a rate of 1 ℃ per minute, heating to 600 ℃ at a rate of 2 ℃ per minute, heating to 850-950 ℃ at a rate of 3 ℃ per minute, and preserving heat for 2-6H to obtain the bimetallic nitride catalyst containing the iron cobalt nitride. Optionally, the freeze-drying the hydrogel to obtain an aerogel comprises: And freeze-drying the hydrogel for 30-40 hours at the temperature of- (40-45) DEG C to obtain the aerogel. Optionally, the mass volume ratio of the soluble starch to the water is 1 (20-25) g/mL. Based on the same inventive concept, the present disclosure also provides a bimetallic nitride catalyst prepared by the preparation method of the bimetallic nitride catalyst described in any one of the above. Based on the same inventive concept, the disclosure also provides an application of the bimetallic nitride catalyst in a cathode oxygen reduction reaction of a zinc-air battery. From the above, the preparation method of the bimetallic nitride catalyst comprises the steps of adding ferric nitrate and soluble starch into water, stirring until the mixture is gelatinized to obtain gelatinized liquid, adding zinc nitrate, dicyandiamide and cobalt nitrate into the gelatinized liquid, stirring uniformly to obtain hydrogel, freeze-drying the hydrogel to obtain aerogel, and placing the aerogel in an ammonia atmosphere and preserving the temperature of 850-950 ℃ for 2-6H to obtain the bimetallic nitride catalyst containing iron cobalt nitride. The soluble starch is used as a carbon source, a three-dimensional reticular gel structure is formed after gelatinization, a carbon skeleton substrate is provided for the whole catalyst precursor, the reticular structure effectively binds the metal precursor, the p