Synthesis of NiRu-Layered Double Hydroxide for Enhanced Oxygen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Layered double hydroxides (LDHs) are promising materials for electrochemical applications.
• Optimizing synthesis conditions is crucial for enhancing LDH performance.
• The oxygen evolution reaction (OER) is a key process in energy conversion.

Purpose of the Study:

• To synthesize nickel-ruthenium layered double hydroxide (NiRu-LDH) using a coprecipitation method.
• To investigate the impact of synthesis temperature on the structural properties and electrochemical performance of NiRu-LDH.
• To evaluate the OER efficiency of NiRu-LDH synthesized at different temperatures.

Main Methods:

• Coprecipitation synthesis of NiRu-LDH using formamide as solvent and intercalant.
• Varying synthesis temperatures to study their effect on LDH formation.
• Electrochemical characterization, including overpotential measurements and Tafel slope analysis for OER evaluation.

Main Results:

• The optimal synthesis temperature of 50 °C yielded NiRu-LDH with a well-defined morphology and balanced crystallinity.
• The NiRu-LDH-50 sample demonstrated superior OER activity, requiring only 280 mV overpotential to reach 10 mA/cm².
• Excellent catalytic kinetics were observed, indicated by a low Tafel slope of 52 mV/dec.

Conclusions:

• Synthesis temperature is a critical parameter for tailoring NiRu-LDH structure and OER performance.
• NiRu-LDH synthesized at 50 °C exhibits enhanced active sites and charge transfer, leading to improved OER efficiency.
• This study highlights a facile method for preparing high-performance NiRu-LDH catalysts for OER.