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Amorphous Metal-Organic Framework-Derived Electrocatalyst to Boost Water Oxidation.

Qingxi Zhai¹, Kuo-Juei Hu², Yuxuan Shi¹

¹National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, P. R. China.

The Journal of Physical Chemistry Letters

|January 29, 2023

Summary

This study introduces a novel amorphous-crystalline heterostructure catalyst for the oxygen evolution reaction. The new material demonstrates enhanced electrocatalytic performance and stability, advancing water-splitting technologies.

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Amorphous metal-organic frameworks (MOFs) show promise for electrocatalysts but suffer from poor conductivity and stability.
Developing efficient electrocatalysts is crucial for electrochemical oxygen evolution reactions and water-splitting systems.

Purpose of the Study:

To engineer a novel amorphous-crystalline (AC) heterostructure catalyst for improved oxygen evolution reaction (OER) performance.
To overcome the limitations of amorphous MOFs in terms of electrical conductivity and stability.

Main Methods:

Synthesis of a crystalline metal sulfide (MS)-embedded amorphous Ni0.67Fe0.33-MOF (MS/Ni0.67Fe0.33-MOF).
Characterization of the AC heterostructure's electrochemical properties and catalytic activity for OER.

Main Results:

The MS/Ni0.67Fe0.33-MOF exhibited excellent catalytic performance with a low overpotential of 248 mV at 10 mA cm-2 and a Tafel slope of 50 mV decade-1.
The catalyst demonstrated superior durability and stability, with only an 8% degradation in current density after 24 hours of operation.

Conclusions:

The developed AC heterostructure effectively enhances electrocatalytic activity and stability for the oxygen evolution reaction.
Engineering AC heterointerfaces presents a promising strategy for optimizing catalysts in water-splitting applications.