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Defect Engineered Metal-Organic Framework with Accelerated Structural Transformation for Efficient Oxygen Evolution

Jieting Ding1, Danyu Guo1, Nanshu Wang1

  • 1Guangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China.

Angewandte Chemie (International Ed. in English)
|September 6, 2023
PubMed
Summary
This summary is machine-generated.

Defect engineering in metal-organic frameworks (MOFs) enables controlled transformation into active metal oxyhydroxides for enhanced oxygen evolution reaction (OER) catalysis. This strategy creates oxygen vacancies, boosting catalytic performance.

Keywords:
Defect EngineeringElectrocatalysisElectrochemical ReconstructionMetal-Organic FrameworksOxygen Evolution Reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Metal-organic frameworks (MOFs) are increasingly used for oxygen evolution reaction (OER).
  • MOF surfaces typically transform into catalytically active metal oxyhydroxides during OER.
  • Controlling this MOF reconstruction process is a significant challenge.

Purpose of the Study:

  • To develop a defect engineering strategy for controlled MOF transformation into metal oxyhydroxides.
  • To enhance the catalytic activity of MOFs in the oxygen evolution reaction (OER).
  • To investigate the role of oxygen vacancies in the enhanced OER performance.

Main Methods:

  • Constructed defective MOFs (NiFc'x Fcx-1) using mixed ligands: 1,1'-ferrocene dicarboxylic acid (Fc') and defective ferrocene carboxylic acid (Fc).
  • Investigated the structural transformation of defective vs. non-defective MOFs under OER conditions.
  • Analyzed the resulting metal oxyhydroxides for oxygen vacancy concentration using experimental and theoretical methods.

Main Results:

  • Defective MOFs (NiFc'x Fcx-1) showed a greater propensity for transformation into metal oxyhydroxides compared to non-defective MOFs (NiFc').
  • The derived metal oxyhydroxides from defective MOFs exhibited a higher concentration of oxygen vacancies.
  • NiFc'Fc grown on nickel foam achieved an overpotential of 213 mV at 100 mA cm⁻², outperforming non-defective NiFc'.

Conclusions:

  • Defect engineering effectively facilitates MOF transformation into active metal oxyhydroxides for OER.
  • Oxygen vacancies in the derived metal oxyhydroxides are crucial for improved OER activity.
  • The strategy offers a pathway to design highly active OER electrocatalysts based on MOF derivatives.