Rapid preparation of high efficiency hydrogen evolution catalyst with hydrophilicity

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Electrolytic water splitting is a key process for sustainable hydrogen production.
• Developing cost-effective and highly active catalysts is crucial for efficient electrolysis.
• Carbon steel (CS) offers potential as a robust and inexpensive substrate for catalyst development.

Purpose of the Study:

• To prepare and characterize a novel Ni-Co/CS catalyst for hydrogen evolution reaction (HER).
• To evaluate the catalytic performance and stability of Ni-Co/CS in alkaline media.
• To investigate the role of carbon steel as a base material for Ni-Co electrocatalysts.

Main Methods:

• Electrodeposition using a dynamic hydrogen bubble template method.
• Electrochemical characterization including overpotential and current density measurements.
• Long-term stability testing in 6 M KOH solution.

Main Results:

• Ni-Co microspheres and nanoclusters were successfully electrodeposited on carbon steel.
• The Ni-Co/CS catalyst exhibited a low overpotential of 48 mV at 50 mA cm⁻² in 6 M KOH.
• The catalyst demonstrated excellent stability, maintaining performance for over 500 hours, and possessed a high electrochemically active surface area (ECSA) and hydrophilic surface.

Conclusions:

• Carbon steel is an effective and stable base material for Ni-Co catalysts in water electrolysis.
• The developed Ni-Co/CS catalyst presents a promising, low-cost alternative for industrial hydrogen production.
• This advancement contributes to the practical application of efficient hydrogen generation through water electrolysis.