High-performance Co-doped RuO₂ nanoparticles for alkaline hydrogen evolution reaction.

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Efficient electrocatalysts are crucial for sustainable hydrogen production via the hydrogen evolution reaction (HER).
• Platinum-based catalysts are benchmarks but expensive, driving research into alternatives for alkaline HER.

Purpose of the Study:

• To synthesize and evaluate novel cobalt-doped ruthenium oxide nanoparticles supported on carbon for alkaline HER.
• To achieve electrocatalyst activity comparable to or exceeding platinum for efficient hydrogen production.

Main Methods:

• A two-step synthesis method was employed to create carbon-supported cobalt-doped RuO2 nanoparticles.
• Electrochemical tests were conducted to assess the catalytic performance for the alkaline HER.

Main Results:

• The optimal cobalt-doped catalyst (RuCoC-2) demonstrated high current densities at low overpotentials for alkaline HER.
• RuCoC-2 exhibited superior mass activity (1.28 A mg-1 Ru) and hydrogen productivity (0.71 H2 s-1) at -0.05 V.
• Performance metrics surpassed those of the benchmark platinum/carbon (Pt/C) catalyst.

Conclusions:

• The developed RuCoC-2 catalyst shows exceptional potential for efficient and cost-effective hydrogen evolution.
• This research contributes to advancing electrocatalyst technology for renewable hydrogen fuel production.