2D amorphous bi-metallic NiFe nitrides for a high-efficiency oxygen evolution reaction

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is crucial for energy conversion technologies.
• Two-dimensional (2D) materials offer unique properties for catalytic applications.
• Nickel-iron (NiFe) based materials are promising for OER but require structural optimization.

Purpose of the Study:

• To synthesize novel 2D bi-metallic NiFe nitrides (2D NiFe-N) with tailored properties.
• To investigate the electrocatalytic performance of these 2D NiFe-N materials for the oxygen evolution reaction.
• To understand the structure-property relationships governing their enhanced activity.

Main Methods:

• Guided synthesis of 2D NiFe-N using designed ternary deep eutectic solvents.
• Density Functional Theory (DFT) calculations to guide material design.
• Electrochemical characterization to evaluate OER performance (overpotential, stability).

Main Results:

• Successfully synthesized large-size, ultrathin amorphous 2D NiFe-N.
• The NiFe_0.05-N material exhibited excellent OER performance.
• Achieved a low overpotential of 238 mV at 10 mA cm^-2 with remarkable durability.

Conclusions:

• The designed synthesis approach yields high-performance 2D NiFe-N electrocatalysts.
• The unique 2D structure and tunable electronic properties contribute to the extraordinary OER activity.
• These findings present a promising new class of materials for efficient oxygen evolution.