CN-122013248-A - Arginine composite FeNiOOH oxygen evolution electrocatalyst and preparation method and application thereof

Abstract

The invention provides an arginine composite FeNiOOH oxygen evolution electrocatalyst, a preparation method and application thereof, and belongs to the field of electrocatalytic materials. According to the arginine composite FeNiOOH oxygen evolution electrocatalyst provided by the invention, an arginine molecule or a derivative thereof is introduced in situ on the surface of FeNiOOH to construct an Fe/Ni-N coordination structure, so that the Fe-Ni atomic distance is obviously compressed, the d-d orbit coupling between metals is enhanced, the formation of O-O bonds is cooperatively promoted, the efficient OPM reaction path is preferentially activated, and the catalyst is different from the traditional adsorption evolution mechanism or lattice oxygen mechanism, so that the reaction energy barrier is reduced, and the kinetic efficiency is improved. Arginine can further regulate and control the hybridization intensity of d-p orbit between metal and oxygen, and optimize The adsorption free energy of the key OER intermediate is effectively inhibited, the structural damage caused by LOM is obviously weakened, and the stability of the catalyst is improved.

Inventors

• QU QING
• LI GUANG
• LI LEI

Assignees

• 云南大学

Dates

Publication Date

20260512

Application Date

20260312

Claims (10)

1. 1. The arginine composite FeNiOOH oxygen evolution electrocatalyst is characterized by comprising a FeNiOOH nano array, wherein arginine molecules and/or arginine derivative molecules are anchored on the surface of the FeNiOOH nano array through Fe-N and Ni-N coordination bonds.
2. 2. The arginine composite FeNiOOH oxygen evolution electrocatalyst according to claim 1, wherein the FeNiOOH nanoarray is composed of a flower-like sphere FeNiOOH nanostructure, the flower-like sphere structure is formed by clustering nanosheets, and the average diameter of the flower-like sphere FeNiOOH is 300-800 nm.
3. 3. The arginine complex FeNiOOH oxygen evolution electrocatalyst according to claim 1, wherein the mass of Arg molecules and/or Arg is 5-8% of the mass of FeNiOOH nanoarray.
4. 4. The method for preparing the arginine complex FeNiOOH oxygen evolution electrocatalyst according to any one of claims 1 to 3, comprising the steps of: Placing a conductive substrate in Fe-Ni precursor solution, performing hydrothermal reaction, and growing FeNiOOH nano arrays on the surface of the conductive substrate in situ to obtain FeNiOOH precursor, wherein the Fe-Ni precursor solution comprises a soluble iron source, a soluble nickel source, an alkaline pH regulator, a complexing agent and a solvent; Immersing the FeNiOOH precursor into arginine solution, carrying out dipping treatment, and annealing to obtain the arginine composite FeNiOOH oxygen evolution electrocatalyst.
5. 5. The method according to claim 4, wherein the alkaline pH adjustor comprises one of urea, hexamethylenetetramine and aqueous ammonia; The complexing agent comprises one of fluoride ion complexing agent, sodium citrate and ethylenediamine tetraacetic acid.
6. 6. The preparation method of claim 4, wherein the molar ratio of the soluble iron source to the soluble nickel source is 1:1-3 based on iron and nickel ions in the soluble iron source and the soluble nickel source; the molar ratio of the alkaline pH regulator to the total metal ions is 2:1, and the molar ratio of the complexing agent to the total metal ions is 1:1.
7. 7. The preparation method according to claim 4 or 6, wherein the hydrothermal reaction is carried out at a temperature of 80-120 ℃ for a heat preservation time of 6-12 hours.
8. 8. The method according to claim 4, wherein the concentration of the arginine solution is 3 to 5mmol/L.
9. 9. The preparation method according to claim 4 or 8, wherein the temperature of the impregnation treatment is 60-80 ℃ and the heat preservation time is 3-5 h; the annealing temperature is 200-250 ℃ and the annealing time is 2-5 h.
10. 10. Use of the arginine complex FeNiOOH oxygen evolution electrocatalyst according to any one of claims 1 to 3 or the arginine complex FeNiOOH oxygen evolution electrocatalyst prepared by the method according to any one of claims 4 to 9 as an anode in the production of hydrogen by electrolysis of water.

Description

Arginine composite FeNiOOH oxygen evolution electrocatalyst and preparation method and application thereof Technical Field The invention belongs to the field of electrocatalytic materials, and particularly relates to an arginine composite FeNiOOH oxygen evolution electrocatalyst, and a preparation method and application thereof. Background Hydrogen energy is of great interest as a clean, high energy density energy carrier. Alkaline water electrolysis is an important technical means for realizing green hydrogen production, wherein the slow kinetics of the anodic oxygen evolution reaction (Oxygen Evolution Reaction, OER) is a key step for limiting the efficiency of the anodic oxygen evolution reaction. The conventional OER electrocatalyst is mostly noble metal oxides such as RuO 2、IrO2, and the like, and has high catalytic activity, but the high cost and scarcity limit the large-scale application. In recent years, iron nickel oxyhydroxide (FeNiOOH) has been considered as a potential material to replace noble metal catalysts due to its abundant crustal reserves and excellent electrocatalytic activity. The traditional FeNiOOH electrocatalyst drives OER mainly through adsorption progress, follows an adsorption intermediate evolution mechanism (Adsorbate Evolution Mechanism, AEM), but is limited by the linear relation between the adsorption energies of intermediates, and the catalytic activity of the catalyst has a theoretical bottleneck. In addition, some studies have attempted to activate lattice oxygen-mediated mechanisms (LOM) to improve performance, but tend to result in catalyst structure instability, affecting long-term durability. Therefore, developing an OER catalytic pathway with both high activity and high stability is of great importance. Disclosure of Invention The invention aims to provide an arginine composite FeNiOOH oxygen evolution electrocatalyst, a preparation method and application thereof, and the arginine composite FeNiOOH oxygen evolution electrocatalyst provided by the invention has high activity and high stability. In order to achieve the purpose of the invention, the invention provides the following technical scheme: an arginine composite FeNiOOH oxygen evolution electrocatalyst comprises a FeNiOOH nano array, wherein arginine molecules and/or arginine derivative molecules are anchored on the surface of the FeNiOOH nano array through Fe-N and Ni-N coordination bonds. Preferably, the FeNiOOH nano array consists of a flower-like sphere FeNiOOH nano structure, the flower-like sphere structure is formed by clustering nano sheets, and the average diameter of the flower-like sphere FeNiOOH is 300-800 nm. Preferably, the Arg molecule and/or Arg has a mass of 5-8% of the mass of FeNiOOH nm array. The invention also provides a preparation method of the arginine composite FeNiOOH oxygen evolution electrocatalyst according to the technical scheme, which comprises the following steps: Placing a conductive substrate in Fe-Ni precursor solution, performing hydrothermal reaction, and growing FeNiOOH nano arrays on the surface of the conductive substrate in situ to obtain FeNiOOH precursor, wherein the Fe-Ni precursor solution comprises a soluble iron source, a soluble nickel source, an alkaline pH regulator, a complexing agent and a solvent; Immersing the FeNiOOH precursor into arginine solution, carrying out dipping treatment, and annealing to obtain the arginine composite FeNiOOH oxygen evolution electrocatalyst. Preferably, the alkaline pH regulator comprises one of urea, hexamethylenetetramine and ammonia water; The complexing agent comprises one of fluoride ion complexing agent, sodium citrate and ethylenediamine tetraacetic acid. Preferably, the mole ratio of the soluble iron source to the soluble nickel source is 1:1-3 based on iron and nickel ions in the soluble iron source and the soluble nickel source; the molar ratio of the alkaline pH regulator to the total metal ions is 2:1, and the molar ratio of the complexing agent to the total metal ions is 1:1. Preferably, the temperature of the hydrothermal reaction is 80-120 ℃, and the heat preservation time is 6-12 h. Preferably, the concentration of the arginine solution is 3-5 mmol/L. Preferably, the temperature of the dipping treatment is 60-80 ℃, and the heat preservation time is 3-5 hours; the annealing temperature is 200-250 ℃ and the annealing time is 2-5 h. The invention also provides an application of the arginine composite FeNiOOH oxygen evolution electrocatalyst prepared by the technical scheme or the arginine composite FeNiOOH oxygen evolution electrocatalyst prepared by the technical scheme preparation method as an anode in hydrogen production by water electrolysis. The invention provides an arginine composite FeNiOOH oxygen evolution electrocatalyst, wherein an arginine molecule and/or an arginine derivative molecule is anchored on the surface of a FeNiOOH nano array through Fe-N and Ni-N coordination bonds. According to the inventio