Preparation method and application of a ferric oxyhydroxide-metal organic framework heterostructure basic electrolytic water catalyst

By in-situ growing FeOOH and MOF-74 on a foamed iron substrate to form a heterogeneous electrocatalyst, the problems of high overpotential and poor stability of existing electrocatalysts are solved, achieving a highly efficient and durable electrocatalytic water splitting effect, which is suitable for electrocatalytic water splitting reactions.

CN116254574BActive Publication Date: 2026-06-19DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Filing Date
2023-03-24
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing electrocatalysts suffer from high overpotential and poor stability in water splitting reactions. In particular, the scarcity and high cost of precious metal catalysts limit their large-scale application. There is a need to develop efficient and durable bifunctional electrocatalysts to reduce overpotential and improve stability.

Method used

A two-step method involving constant current anodic oxidation and hydrothermal reaction using a three-electrode system was employed to in-situ convert FeOOH and uniformly grow MOF-74 on a foamed iron substrate, forming a FeOOH@MOF-74/IF heterostructure electrocatalyst. This method avoids high-temperature treatment and allows the catalyst to be directly used as the electrocatalytic electrode.

Benefits of technology

The prepared FeOOH@MOF-74/IF electrocatalyst exhibits a small overpotential and fast water splitting kinetics in alkaline electrolyte, with excellent high current stability and high active surface area, making it suitable for electrocatalytic water splitting reactions, especially showing significant catalytic advantages in OER and HER processes.

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Abstract

A method for preparing and applying an iron hydroxyl oxide-metal-organic framework heterostructure alkaline water electrolysis catalyst is disclosed, belonging to the technical field of electrochemical energy storage materials. The preparation method involves: firstly, anolysing iron foam under constant current; then dissolving 2,5-dihydroxyterephthalic acid and nickel nitrate hexahydrate in a mixed solvent of N,N-dimethylformamide / ethanol / deionized water; transferring the mixture to a reaction vessel, tilting the iron foam into the vessel, sealing and heating the reaction, and then naturally cooling to room temperature; removing the iron foam, rinsing it with deionized water and ethanol (both sides), and finally vacuum drying. This method is simple and reproducible, requiring no cumbersome high-temperature pyrolysis or etching processes, and is suitable for large-scale preparation. In a standard three-electrode system, the prepared electrocatalyst is directly used as the working electrode in a 1 M KOH electrolyte for electrocatalytic reaction; the electrocatalyst exhibits excellent water splitting activity and cycling stability at high current densities.
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