Methanol and Ethanol Electrooxidation on ZrO₂/NiO/rGO

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Transition metal oxides exhibit unique properties, driving interest in their diverse applications.
• Metal oxides are promising catalysts, particularly for fuel cell anodes.
• Developing efficient electrocatalysts is crucial for advancing alcohol fuel cell technology.

Purpose of the Study:

• To synthesize and characterize a novel three-component catalyst: zirconium oxide (ZrO2), nickel oxide (NiO), and reduced graphene oxide (rGO).
• To evaluate the electrocatalytic activity of the synthesized ZrO2/NiO/rGO nanocatalyst for methanol and ethanol oxidation reactions (MOR/EOR).
• To assess the potential of this catalyst for application in the anode of alcohol fuel cells.

Main Methods:

• One-step hydrothermal synthesis for ZrO2/NiO/rGO.
• Material characterization using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and bright-field transmission electron microscopy (BF-TEM).
• Electrochemical performance evaluation via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and linear sweep voltammetry (LSV).

Main Results:

• The ZrO2/NiO/rGO catalyst was successfully synthesized and characterized.
• For MOR: current density of 26.6 mA/cm², peak potential of 0.52 V, and 99.5% cyclic stability.
• For EOR: current density of 17.3 mA/cm², peak potential of 0.52 V, and 98.5% cyclic stability.

Conclusions:

• The synthesized ZrO2/NiO/rGO nanocatalyst exhibits outstanding electrocatalytic activity for both methanol and ethanol oxidation.
• The catalyst demonstrates high current densities and excellent cyclic stability, suitable for alcohol fuel cell anodes.
• This material presents an attractive and efficient option for next-generation alcoholic fuel cell applications.