A Highly-Efficient Oxygen Evolution Electrocatalyst Derived from a Metal-Organic Framework and Ketjenblack Carbon...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is crucial for energy conversion technologies.
• Metal-organic frameworks (MOFs) offer tunable structures but often require enhancement for optimal electrochemical performance.

Purpose of the Study:

• To synthesize and characterize a composite of Ni(Fe)-MOF-74 and ketjenblack (KB) for enhanced OER activity.
• To investigate the electrochemical performance and stability of the composite material.

Main Methods:

• One-step solvothermal synthesis of the Ni(Fe)-MOF-74/KB composite.
• Electrochemical characterization of the composite for OER performance in 1 mol/L KOH.
• Analysis of the activation mechanism of nickel-iron clusters under anodic bias.

Main Results:

• The Ni(Fe)-MOF-74/KB composite exhibited remarkable OER performance with an overpotential of 0.274 V at 10 mA/cm² and a current density of 650 mA/cm² at 1.7 V.
• Activation of nickel-iron clusters within the MOF significantly boosted OER activity.
• The composite demonstrated excellent OER performance despite minor structural modifications during electrochemical testing.

Conclusions:

• A simple strategy for creating highly efficient electrocatalysts by combining MOFs with conductive carbon materials was demonstrated.
• The Ni(Fe)-MOF-74/KB composite shows great potential for electrode fabrication in energy conversion applications.
• This approach facilitates the integration of diverse metal-organic complexes for high-efficiency energy conversion.