A brush-like Cu₂O-CoO core-shell nanoarray: an efficient bifunctional electrocatalyst for overall seawater splitting.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Efficient electrocatalysts are crucial for water splitting technologies.
• Seawater electrolysis presents unique challenges due to its complex composition.
• Developing robust and cost-effective catalysts for seawater splitting remains a key research area.

Purpose of the Study:

• To develop and evaluate a novel brush-like Cu2O-CoO core-shell nanoarray on copper foam (Cu2O-CoO/CF) as an electrocatalyst.
• To assess the performance of Cu2O-CoO/CF for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline seawater.
• To investigate the stability and hierarchical structure advantages of the developed catalyst.

Main Methods:

• Synthesis of Cu2O-CoO core-shell nanoarrays on copper foam.
• Electrochemical characterization using techniques like cyclic voltammetry and chronoamperometry.
• Performance evaluation in alkaline seawater electrolyte for OER and HER.
• Stability testing in a two-electrode electrolyzer setup.

Main Results:

• The Cu2O-CoO/CF catalyst exhibited low overpotentials of 315 mV for OER and 295 mV for HER at 100 mA cm-2.
• The electrolyzer operated efficiently at 1.82 V with a current density of 100 mA cm-2.
• The catalyst demonstrated strong stability, maintaining performance for at least 50 hours of continuous electrolysis.

Conclusions:

• The brush-like Cu2O-CoO/CF catalyst shows excellent efficiency and stability for seawater splitting.
• The hierarchical nanostructure contributes significantly to the enhanced electrocatalytic activity.
• This work provides valuable insights for designing next-generation electrocatalysts for sustainable energy applications.