Facile Engineering of CoS@NiS Heterostructures for Efficient Oxygen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Green Energy

Background:

• Hydrogen production via water electrolysis is key for green hydrogen.
• The oxygen evolution reaction (OER) presents a high overpotential, increasing energy consumption.
• Efficient, stable, and low-cost catalysts are needed to lower the energy barrier.

Purpose of the Study:

• To synthesize and evaluate CoS@NiS-80% nanosheets as an electrocatalyst for the oxygen evolution reaction.
• To investigate the role of heterogeneous interfaces in enhancing catalytic performance.
• To reduce energy consumption in water electrolysis for green hydrogen production.

Main Methods:

• Hydrothermal reaction and sulfuration were used to synthesize CoS@NiS-80% nanosheets.
• Electrochemical measurements were conducted under alkaline conditions to assess OER performance.
• Catalyst stability was evaluated through continuous operation tests.

Main Results:

• The synthesized CoS@NiS-80% nanosheets exhibited rich heterogeneous interfaces.
• An overpotential of only 280 mV at 10 mA cm⁻² was achieved, with a Tafel slope of 100.87 mV dec⁻¹.
• The catalyst demonstrated excellent stability, operating continuously for 100 hours.

Conclusions:

• Heterogeneous interfaces in CoS@NiS-80% nanosheets promote charge transfer and synergistic effects, enhancing OER performance.
• This engineered catalyst offers a promising approach for efficient and stable green hydrogen production.
• The study highlights the potential of transition metal sulfide-based electrocatalysts modified by interface engineering.