Carbon quantum dot/NiFe layered double-hydroxide composite as a highly efficient electrocatalyst for water oxidation

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Efficient catalysts are vital for energy conversion and storage.
• Oxygen evolution reaction (OER) requires highly active, durable, and earth-abundant catalysts.
• Current catalysts often face limitations in efficiency, stability, or cost.

Purpose of the Study:

• To design and synthesize a novel catalyst for the oxygen evolution reaction.
• To enhance the electrocatalytic activity and stability of nickel-iron layered double-hydroxides.
• To explore the synergistic effects of carbon quantum dots with NiFe-LDH for OER.

Main Methods:

• Fabrication of carbon quantum dot (CQD) / nickel-iron layered double-hydroxide (NiFe-LDH) hybrid nanoplates.
• Characterization of the CQD/NiFe-LDH complex using appropriate analytical techniques.
• Electrochemical testing of the catalyst's performance in oxygen evolution reactions.

Main Results:

• The CQD/NiFe-LDH complex demonstrated high electrocatalytic activity for OER.
• An overpotential of approximately 235 mV was achieved at 10 mA cm⁻² in 1 M KOH.
• The catalyst exhibited excellent stability and performance comparable to state-of-the-art perovskite catalysts.

Conclusions:

• The developed CQD/NiFe-LDH hybrid material is a highly efficient and stable electrocatalyst for the oxygen evolution reaction.
• This earth-abundant catalyst offers a promising alternative to expensive and rare noble metal catalysts.
• The findings contribute to the advancement of catalysts for crucial energy conversion and storage applications.