Carbon-protected bimetallic carbide nanoparticles for a highly efficient alkaline hydrogen evolution reaction

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• The hydrogen evolution reaction (HER) is vital for energy-efficient water-alkali and chlor-alkali electrolyzers.
• Developing active and durable electrocatalysts for alkaline HER is a significant challenge.
• Noble metal catalysts like platinum are effective but costly.

Purpose of the Study:

• To synthesize and evaluate carbon-coated cobalt-tungsten carbide nanoparticles as noble metal-free electrocatalysts for alkaline HER.
• To investigate the catalytic activity, durability, and efficiency of the synthesized material.

Main Methods:

• Synthesis of carbon-coated cobalt-tungsten carbide nanoparticles.
• Electrochemical characterization of the catalyst's performance in an alkaline environment.
• Assessment of stability and Faradaic yield during HER.

Main Results:

• The synthesized catalyst achieved a current density of 10 mA cm⁻² at a low overpotential of 73 mV.
• Performance was comparable to platinum/carbon (Pt/C) catalysts.
• The catalyst demonstrated stable operation at high current densities (>30 mA cm⁻¹) for 18 hours with nearly 100% Faradaic yield.

Conclusions:

• Carbon-coated cobalt-tungsten carbide nanoparticles are highly efficient and durable noble metal-free electrocatalysts for alkaline HER.
• The synergistic effect between the carbide core and carbon shell enhances catalytic performance.
• This development presents a promising alternative for cost-effective and efficient hydrogen production via electrolysis.