3D nickel-cobalt diselenide nanonetwork for highly efficient oxygen evolution

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Efficient electrochemical water splitting requires active, stable, and low-cost oxygen evolution reaction (OER) catalysts.
• Noble metal catalysts like RuO2 are effective but expensive, driving research into alternatives.

Purpose of the Study:

• To develop a novel, noble-metal-free catalyst for efficient oxygen evolution reaction (OER).
• To investigate the effect of nanostructure morphology on catalytic performance.
• To provide a cost-effective alternative to noble metal catalysts for electrochemical water splitting.

Main Methods:

• Fabrication of a 3D nanonetwork of nickel cobalt diselenide (NiCoSe2) nanobrush arrays on nickel foam (NF).
• Utilized hydrothermal reaction followed by thermal selenization.
• Controlled hierarchical architecture (nanorods, nanobrush, nanosheets) using ammonium fluoride.

Main Results:

• The NiCoSe2 nanobrush/NF exhibited superior OER performance compared to nanorods, nanosheets, and commercial RuO2.
• Achieved a low overpotential of 274mV at 10mA/cm2 with a small Tafel slope.
• Demonstrated excellent long-term stability in alkaline media.

Conclusions:

• The developed 3D NiCoSe2 nanonetwork is a highly efficient and stable OER catalyst.
• Nanoscale engineering of the NiCoSe2 architecture significantly impacts catalytic activity.
• This material presents a promising, cost-effective alternative to noble metal catalysts for electrochemical water oxidation.