A NiCo-MOF nanosheet array based electrocatalyst for the oxygen evolution reaction

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Metal-organic frameworks (MOFs) show promise for energy applications.
• Efficient electrocatalysts are crucial for energy conversion technologies like the oxygen evolution reaction (OER).
• Developing advanced materials for OER under alkaline conditions is essential for energy storage and conversion.

Purpose of the Study:

• To investigate 2D metal-organic framework nanosheets as an electrocatalyst for the oxygen evolution reaction (OER).
• To synthesize and characterize a NiCo-metal-organic framework nanosheet array on nickel foam (NiCo-MOF/NF).
• To evaluate the electrocatalytic performance of NiCo-MOF/NF for OER in alkaline media.

Main Methods:

• One-step solvothermal synthesis of NiCo-MOF/NF on nickel foam.
• Electrochemical analysis, including OER performance measurements.
• Characterization of the material's structure and catalytic properties.

Main Results:

• The NiCo-MOF/NF electrode exhibited high catalytic activity for OER.
• Achieved a current density of 50 mA cm^-2 with an overpotential of 270 mV.
• Demonstrated a low Tafel slope of 35.4 mV dec^-1 and a high turnover frequency (TOF) of 0.68 s^-1.

Conclusions:

• The 2D nanosheet array structure of NiCo-MOF provides abundant active sites and enhances mass transport.
• The synergistic effect of Co and Ni in the MOF facilitates faster electron transport.
• NiCo-MOF/NF is a promising electrocatalyst for efficient OER in alkaline environments.