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CN-122013233-A - Six-membered cucurbituril carbon-supported iron-doped nickel phosphide nanosheet catalyst and preparation method and application thereof

CN122013233ACN 122013233 ACN122013233 ACN 122013233ACN-122013233-A

Abstract

The application discloses a six-membered cucurbituril carbon-loaded iron-doped nickel phosphide nanosheet catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and an active component, wherein the carrier is six-membered cucurbituril carbon, and the active component is an iron-doped nickel phosphide nano-sheet. The six-membered cucurbituril carbon-supported iron-doped nickel phosphide nano-sheet catalyst has excellent seawater electrolysis catalytic activity, and in alkaline simulated seawater (1M KOH+0.5MNaCl), when the current density is 100 and 500 mA/cm 2 respectively, the required overpotential is 266 and 333mV respectively, so that the excellent selectivity of 98% and the stability of 1800h can be achieved, and the stability of 600h can be achieved in real seawater.

Inventors

  • CAO RONG
  • CAO MINNA
  • QIN XIANPING

Assignees

  • 中国科学院福建物质结构研究所

Dates

Publication Date
20260512
Application Date
20251225

Claims (10)

  1. 1. The iron-doped nickel phosphide nanosheet catalyst loaded by six-membered cucurbituril carbon is characterized by comprising a carrier and an active component; The carrier is six-membered cucurbituril carbon; the active component is an iron-doped nickel phosphide nano-sheet.
  2. 2. A method for preparing the six-membered guar carbon supported iron doped nickel phosphide nanosheet catalyst as claimed in claim 1, wherein the method comprises the following steps: s1, calcining a six-membered cucurbituril to obtain six-membered cucurbituril carbon; S2, dissolving a nickel source, an iron source, a morphology regulator, a precipitant and the six-membered cucurbituril carbon in a solvent to obtain a uniform solution, and then sequentially carrying out hydrothermal reaction, washing and drying to obtain NiFe LDH/CBC; s3, respectively placing a phosphorus source and the NiFe LDH/CBC at the upstream and the downstream, and phosphating under the atmosphere of inactive gas to obtain the six-membered cucurbituril carbon-loaded iron-doped nickel phosphide nano-sheet catalyst.
  3. 3. The preparation method according to claim 2, wherein in S1, the calcination temperature is 300 to 1000 ℃ and the time is 90 to 180 min; preferably, in the step S1, the temperature rising rate of the calcination is 2-10 ℃ per min.
  4. 4. The method according to claim 2, wherein in S2, the nickel source is at least one of nickel nitrate and nickel chloride; preferably, in the step S2, the iron source is at least one of ferrous sulfate and ferric nitrate; preferably, in the step S2, the morphology regulator is ammonium fluoride; preferably, in the step S2, the precipitant is urea; preferably, in the S2, the nickel source, the iron source, the morphology regulator, the precipitant and the six-membered guar carbon are used in an amount ratio of (1-3) mmol (0.25-0.75) mmol (5-15) mmol (12.5-37.5) mmol (50-150) mg.
  5. 5. The method according to claim 2, wherein in S2, the solvent is water.
  6. 6. The preparation method according to claim 2, wherein in S2, the hydrothermal reaction is performed at a temperature of 90-150 ℃ for 180-540 min; Preferably, in the step S2, the temperature rising rate of the hydrothermal reaction is 1-5 ℃ per min.
  7. 7. The method of claim 2, wherein in S3 the mass ratio of the phosphorus source to NiFe LDH/CBC is (100-1000): (10-100).
  8. 8. The method according to claim 2, wherein in S3, the inert gas is N 2 .
  9. 9. The method according to claim 2, wherein in S3, the phosphating is performed at 300 to 400 ℃ for 120 to 180 minutes; Preferably, in the step S3, the temperature rising rate of the phosphating is 1-5 ℃ per minute.
  10. 10. Use of the six-membered cucurbituril carbon-supported iron-doped nickel phosphide nanosheet catalyst as defined in claim 1 or the six-membered cucurbituril carbon-supported iron-doped nickel phosphide nanosheet catalyst prepared by the preparation method as defined in any one of claims 2-9 in seawater electrolysis.

Description

Six-membered cucurbituril carbon-supported iron-doped nickel phosphide nanosheet catalyst and preparation method and application thereof Technical Field The application relates to a six-membered cucurbituril carbon-supported iron-doped nickel phosphide nanosheet catalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalysis. Background The scarcity of water resources is a major bottleneck limiting pure water electrolysis applications. Therefore, the electrolysis of seawater becomes a more promising means of hydrogen production. However, impurity ions in the seawater can severely corrode the catalyst in the electrolysis process, and chlorine ions with high solubility in the seawater bring side reaction of chlorine precipitation and competition of oxygen evolution reaction, so that the efficiency of the catalyst is affected. Therefore, it is necessary to develop a seawater oxygen evolution reaction catalyst with high activity, high stability and high selectivity. Among them, transition metal phosphide has many advantages such as good conductivity and controllable structure as oxygen evolution reaction catalyst. It is a research hotspot how to effectively utilize transition metal phosphides or to increase their catalytic activity in the electrolysis of seawater. However, the existing nickel phosphide catalyst is easy to be corroded by Cl - in seawater, has poor stability and low selectivity, the nickel phosphide nano-sheets are easy to agglomerate, so that the active sites are not exposed enough, the catalytic activity is limited, and the electronic structure and the corrosion resistance are difficult to be synchronously optimized by single metal doping or carrier loading. Disclosure of Invention Aiming at the problems in the prior art, the application aims to provide a six-membered cucurbituril carbon-loaded iron-doped nickel phosphide nano-sheet catalyst, a preparation method and application thereof, wherein Fe doping adjusts the electron density of Ni, and the structure of six-membered cucurbituril carbon (CBC) inhibits nano-sheet agglomeration and forms an interface coupling effect so that the catalyst also has good catalytic activity, selectivity and stability. According to a first aspect of the application, a six-membered cucurbituril carbon-supported iron-doped nickel phosphide nanoplatelet catalyst is provided. An iron-doped nickel phosphide nanosheet catalyst loaded by six-membered cucurbituril carbon, wherein the catalyst comprises a carrier and an active component; The carrier is six-membered cucurbituril carbon; the active component is an iron-doped nickel phosphide nano-sheet. The catalysis principle of the six-membered cucurbituril carbon-loaded iron-doped nickel phosphide nano-sheet catalyst is that Fe doping induces Ni site electron density to be reduced, d band center moves upwards, oxygen intermediate adsorption energy is optimized, meanwhile, the CBC carrier not only inhibits nano-sheet agglomeration, but also further modulates Fe electronic environment through interface coupling action, and in-situ generation of active phase Ni (Fe) OOH is promoted together and adsorption of Cl - is inhibited. The six-membered cucurbituril carbon-loaded iron-doped nickel phosphide nano-sheet catalyst not only has excellent activity, but also has the advantages of regulating the electron density of Ni by Fe doping, inhibiting nano-sheet agglomeration and forming interface coupling effect by the structure of CBC, so that the six-membered cucurbituril carbon-loaded iron-doped nickel phosphide nano-sheet catalyst has good catalytic activity, selectivity and stability. The catalyst has the advantages that the catalytic activity of the catalyst can be effectively improved by making a heterojunction structure or doping metal elements to adjust the electron density of nickel, agglomeration of nano sheets can be effectively prevented by using a carrier such as commercial carbon, MOF and other framework materials, meanwhile, surface active sites are exposed, and the specific surface area of nickel phosphide nano particles is improved by adjusting the morphology of the nickel phosphide nano particles, so that the catalyst activity is improved. According to a second aspect of the application, a preparation method of the six-membered cucurbituril carbon-supported iron-doped nickel phosphide nanosheet catalyst is provided. The preparation method of the six-membered cucurbituril carbon-loaded iron-doped nickel phosphide nanosheet catalyst comprises the following steps of: s1, calcining a six-membered cucurbituril to obtain six-membered cucurbituril carbon; S2, dissolving a nickel source, an iron source, a morphology regulator, a precipitant and the six-membered cucurbituril carbon in a solvent to obtain a uniform solution, and then sequentially carrying out hydrothermal reaction, washing and drying to obtain NiFe LDH/CBC; s3, respectively placing a phosphorus source and t