High-Performance Ru@C₄N Electrocatalyst for Hydrogen Evolution Reaction in Both Acidic and Alkaline Solutions

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Hydrogen evolution reaction (HER) is crucial for clean energy production.
• Developing efficient and stable electrocatalysts for HER in various electrolytes remains a challenge.
• Ruthenium-based materials show promise but require optimized structures for enhanced activity.

Purpose of the Study:

• To synthesize and characterize a high-performance Ru@C4N electrocatalyst for the hydrogen evolution reaction (HER).
• To evaluate the electrocatalytic activity and stability of the Ru@C4N catalyst in both acidic and alkaline solutions.
• To compare the performance of Ru@C4N with commercial platinum catalysts.

Main Methods:

• Synthesis of Ru@C4N via a one-pot solvothermal method followed by annealing.
• Electrochemical characterization including overpotential measurements at 10 mA/cm² and turnover frequency determination.
• Stability testing in 0.5 M H2SO4 and 1.0 M KOH solutions.

Main Results:

• The Ru@C4N catalyst exhibited very low overpotentials for HER: 6 mV in 0.5 M H2SO4 and 7 mV in 1.0 M KOH.
• Achieved high HER turnover frequencies of 0.93 H2/s in acid and 0.65 H2/s in alkaline solution at 25 mV.
• Demonstrated superior electrocatalytic activity and stability compared to commercial Pt/C.

Conclusions:

• The developed Ru@C4N electrocatalyst is highly effective for HER in both acidic and alkaline environments.
• This material presents a promising alternative to precious metal catalysts like platinum for hydrogen production.
• The synthesis strategy offers a viable route for designing advanced electrocatalysts based on covalent organic frameworks.