In situ Formed Co(TCNQ)₂ Metal-Organic Framework Array as a High-Efficiency Catalyst for Oxygen Evolution Reactions.

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Efficient oxygen evolution reaction (OER) catalysts are crucial for energy conversion and storage systems like water splitting and metal-air batteries.
• Developing high-performance and energy-efficient OER catalysts remains a significant challenge.

Purpose of the Study:

• To develop an in situ synthesized, highly active, and durable OER catalyst.
• To investigate the catalytic properties of a novel metal-organic framework array for OER.

Main Methods:

• In situ development of sawtooth-like Co(TCNQ)2 metal-organic framework array on cobalt foil using a room-temperature solution immersion method.
• Electrochemical characterization to evaluate OER activity and durability.

Main Results:

• The Co(TCNQ)2/Co catalyst exhibited superior OER activity, requiring an overpotential of 310 mV to achieve a current density of 15 mA cm⁻².
• The catalyst demonstrated excellent long-term electrochemical stability, retaining its activity for over 20 hours.
• A high turnover frequency of 0.66 mol O2 s⁻¹ was achieved at an overpotential of 380 mV.

Conclusions:

• The in situ developed Co(TCNQ)2/Co array is a highly efficient and durable electrocatalyst for the oxygen evolution reaction.
• This material holds significant promise for advancing energy conversion and storage technologies.