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CN-121976219-A - Nickel hydroxide/carbon-based electrocatalyst and preparation method thereof

CN121976219ACN 121976219 ACN121976219 ACN 121976219ACN-121976219-A

Abstract

The application relates to a nickel hydroxide/carbon substrate electrocatalyst and a preparation method thereof, which belong to the technical field of material chemistry and comprise the following steps of S1, carbon substrate treatment, S2, nickel salt preparation, S3, alkali solution preparation, S4, catalyst preparation, wherein the carbon substrate is subjected to oxidation treatment to obtain a carbon oxide substrate solution, the alkali solution is dripped into the mixed solution, and the mixed solution is subjected to post-treatment and drying to obtain a composite electrocatalyst. The present application has an effect of facilitating the two electron paths to be dominant in the oxygen reduction reaction by using a nickel hydroxide/carbon-based electrocatalyst.

Inventors

  • DU HEBAO
  • PENG MIN
  • HU WEI
  • ZHAO XI
  • HE WEI
  • PENG LIXIONG
  • ZHAO YUXUAN

Assignees

  • 上海澳思净科技有限公司

Dates

Publication Date
20260505
Application Date
20251230

Claims (10)

  1. 1. The preparation method of the nickel hydroxide/carbon-based electrocatalyst is characterized by comprising the following steps of: S1, carbon substrate treatment, namely, taking a carbon substrate for oxidation treatment to obtain an oxidized carbon substrate; S2, preparing nickel salt, namely mixing the nickel salt with water, adjusting the concentration, and preparing a nickel salt solution; s3, preparing alkali liquor, namely mixing the alkali with water, adjusting the concentration, and preparing the alkali liquor; S4, preparing a catalyst, namely mixing a carbon oxide substrate with water, adjusting the concentration, preparing a carbon oxide substrate solution, mixing the carbon oxide substrate solution with a nickel salt solution to obtain a mixed solution, dripping alkali liquor into the mixed solution, performing post-treatment, and drying to obtain the composite electrocatalyst.
  2. 2. The method for preparing the nickel hydroxide/carbon substrate electrocatalyst according to claim 1, wherein the carbon substrate comprises any one or more of carbon tube, graphene, carbon black, carbon fiber, carbon sphere, carbon felt, and carbon cloth.
  3. 3. The method for preparing the nickel hydroxide/carbon substrate electrocatalyst according to claim 1, wherein the oxidizing treatment comprises immersing the carbon substrate in an acid solution, heating, washing, and drying to obtain the oxidized carbon substrate, wherein the acid solution comprises any one of concentrated sulfuric acid, concentrated nitric acid, and concentrated hydrochloric acid.
  4. 4. The method of preparing a nickel hydroxide/carbon based electrocatalyst according to claim 1, wherein the nickel salt is a divalent nickel salt comprising nickel nitrate hexahydrate or nickel chloride.
  5. 5. The method for preparing nickel hydroxide/carbon based electrocatalyst according to claim 1, wherein the concentration of the nickel salt solution is from 0.01 to 5mol/L.
  6. 6. The method for preparing nickel hydroxide/carbon based electrocatalyst according to claim 5, wherein the alkali solution has a concentration of 0.1 to 5mol/L.
  7. 7. The method for preparing a nickel hydroxide/carbon based electrocatalyst according to claim 6, wherein the concentration of the carbon oxide based solution is from 0.003 to 0.67mol/L.
  8. 8. The method for preparing a nickel hydroxide/carbon based electrocatalyst according to claim 7, wherein the volume ratio of the carbon oxide based solution, the nickel salt solution, and the alkaline solution is (0, 10): 0, 1: [1,4].
  9. 9. The method for preparing a nickel hydroxide/carbon based electrocatalyst according to claim 8, wherein a volume ratio of the carbon oxide based solution, the nickel salt solution, and the alkaline solution is 5:1:2.
  10. 10. Nickel hydroxide/carbon based electrocatalyst prepared by the process according to any one of claims 1 to 9, characterised in that the electrocatalyst has an adsorption energy of 4.1 to 4.3ev.

Description

Nickel hydroxide/carbon-based electrocatalyst and preparation method thereof Technical Field The application relates to the technical field of material chemistry, in particular to a nickel hydroxide/carbon substrate electrocatalyst and a preparation method thereof. Background Hydrogen peroxide) As a green oxidant, the method has wide application in the fields of water treatment, chemical synthesis and the like, the traditional anthraquinone method has the problems of large pollution, high cost, difficult transportation and the like, and the two-electron oxygen reduction reaction (2ORR) electrochemical synthesis of hydrogen peroxide is a green, sustainable production and more potential alternative. The Oxygen Reduction Reaction (ORR) is divided into a two-electron path and a four-electron path, which generates water instead of hydrogen peroxide, and there is competition between the two-electron path and the four-electron path, so that development of a catalyst with high selectivity, which is advantageous in that the two-electron path is dominant, is desired. Disclosure of Invention In order to facilitate the dominant two electron paths in the oxygen reduction reaction, the application provides a nickel hydroxide/carbon-based electrocatalyst and a preparation method thereof. In a first aspect, the present application provides a method for preparing a nickel hydroxide/carbon-based electrocatalyst, which adopts the following technical scheme: The preparation method of the nickel hydroxide/carbon-based electrocatalyst specifically comprises the following steps: S1, carbon substrate treatment, namely, taking a carbon substrate for oxidation treatment to obtain an oxidized carbon substrate; S2, preparing nickel salt, namely mixing the nickel salt with water, adjusting the concentration, and preparing a nickel salt solution; s3, preparing alkali liquor, namely mixing the alkali with water, adjusting the concentration, and preparing the alkali liquor; S4, preparing a catalyst, namely mixing a carbon oxide substrate with water, adjusting the concentration, preparing a carbon oxide substrate solution, mixing the carbon oxide substrate solution with a nickel salt solution to obtain a mixed solution, dripping alkali liquor into the mixed solution, performing post-treatment, and drying to obtain the composite electrocatalyst. Preferably, the carbon substrate comprises any one or more of carbon tube, graphene, carbon black, carbon fiber, carbon sphere, carbon felt and carbon cloth. Preferably, the oxidation treatment comprises the steps of immersing the carbon substrate in an acid solution, heating, washing and drying to obtain the carbon oxide substrate, wherein the acid solution comprises any one of concentrated sulfuric acid, concentrated nitric acid or concentrated hydrochloric acid. Preferably, the nickel salt is a divalent nickel salt comprising nickel nitrate hexahydrate or nickel chloride Preferably, the concentration of the nickel salt solution is 0.01-5mol/L. Preferably, the concentration of the alkali liquor is 0.1-5mol/L. Preferably, the concentration of the carbon oxide substrate solution is 0.003-0.67mol/L. Preferably, the volume ratio of the oxidized carbon substrate solution, the nickel salt solution, and the alkaline solution is (0, 10): (0, 1): [1,4]. Preferably, the volume ratio of the carbon oxide base solution, the nickel salt solution and the alkali liquor is 5:1:2. In a second aspect, an embodiment of the present application provides a nickel hydroxide/carbon-based electrocatalyst prepared by using the above preparation method, where the electrocatalyst has an adsorption energy of 4.1 to 4.3ev. In summary, the present application includes at least one of the following beneficial technical effects: 1. The adsorption energy of the nickel hydroxide/carbon substrate electrocatalyst prepared by the method is close to 4.23ev of an ideal value, so that the electrocatalyst has higher selectivity, and the electrocatalyst has higher activity because of the strong conductivity of the carbon substrate, and can be favorable for leading two electron paths in the oxygen reduction reaction process, thereby realizing efficient hydrogen peroxide production. Drawings FIG. 1 is an XRD pattern for a nickel hydroxide/carbon based electrocatalyst according to example one of the application. FIG. 2 is an SEM image of a nickel hydroxide/carbon based electrocatalyst according to an embodiment of the application. FIG. 3 is a LSV graph of a rotating ring disk test for nickel hydroxide/carbon based electrocatalysts in example one of the application. Fig. 4 is an XRD pattern of the nickel hydroxide/carbon based electrocatalyst in example two of the application. Fig. 5 is an SEM image of a nickel hydroxide/carbon based electrocatalyst in example two of the application. Fig. 6 is a graph of current-voltage curves for a nickel hydroxide/carbon based electrocatalyst in example two of the application in a double cell. FIG. 7 is a gra