Loading layered double hydroxide nanoarray catalysts on a micro-curved substrate for kinetics-favorable water...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is crucial for energy conversion technologies.
• Layered double hydroxides (LDHs) show promise but often face challenges with interfacial contact and stability.
• Nanostructured catalysts can offer high surface areas and improved reaction kinetics.

Purpose of the Study:

• To engineer a NiFe layered double hydroxide nanoarray catalyst with enhanced interfacial properties.
• To investigate the effect of micro-scale curvature on catalyst performance.
• To achieve a low overpotential for the oxygen evolution reaction.

Main Methods:

• Synthesis of NiFe layered double hydroxide nanoarrays.
• Loading catalysts onto a nickel metal substrate with controlled micro-scale curvature.
• Electrochemical characterization of the oxygen evolution reaction (OER) performance.

Main Results:

• The NiFe layered double hydroxide nanoarray catalyst on the curved substrate exhibited improved interfacial reaction kinetics.
• Achieved a low OER overpotential of 257 mV at a high current density of 400 mA cm^-2.
• The performance is among the best reported for OER electrodes.

Conclusions:

• Micro-scale curvature of the substrate significantly enhances catalyst performance.
• NiFe layered double hydroxides are effective OER electrocatalysts when integrated with optimized substrates.
• This work provides a pathway for designing high-performance electrocatalysts for energy applications.