C and N Hybrid Coordination Derived Co-C-N Complex as a Highly Efficient Electrocatalyst for Hydrogen Evolution...

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Developing efficient electrocatalysts for the hydrogen evolution reaction (HER) is crucial for water splitting and renewable energy storage.
• Earth-abundant catalysts are highly desirable to replace expensive noble metal catalysts.
• Current catalysts often face challenges with activity, stability, or cost.

Purpose of the Study:

• To develop a highly efficient and stable HER catalyst using earth-abundant elements.
• To investigate a novel Co-C-N complex bonded carbon material for HER.
• To understand the catalytic mechanism through experimental and computational methods.

Main Methods:

• Synthesis of a self-supported, three-dimensional porous Co-C-N carbon material.
• Electrochemical characterization of the catalyst for HER performance (overpotential, stability).
• Density Functional Theory (DFT) calculations to elucidate the reaction mechanism.

Main Results:

• The Co-C-N catalyst exhibited excellent HER activity with a low overpotential of 212 mV at 100 mA cm(-2).
• The catalyst demonstrated superior long-term stability compared to many traditional metal catalysts.
• DFT calculations revealed that C and N hybrid coordination optimizes charge distribution and electron transfer.

Conclusions:

• The developed Co-C-N carbon material represents a promising earth-abundant catalyst for efficient hydrogen evolution.
• The synergistic effect of C and N hybrid coordination is key to enhancing catalytic performance.
• This work contributes to advancing water splitting technologies for renewable energy conversion and storage.