Self-Assembly of Copper Oxide Interfaced MnO₂ for Oxygen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Designing efficient electrocatalytic systems for reactions like the oxygen evolution reaction (OER) is challenging.
• Developing facile synthesis methods for advanced catalysts is critical for energy technologies.

Purpose of the Study:

• To synthesize and evaluate a novel composite electrocatalyst based on copper oxide and manganese oxide (CuO/MnO2) for the oxygen evolution reaction (OER).
• To investigate the structural, morphological, and electrochemical properties of the synthesized CuO/MnO2 composite.

Main Methods:

• Synthesis of CuO/MnO2 composite using a microwave technique.
• Characterization using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and energy-dispersive spectrometry (EDS).
• Electrochemical evaluation of OER performance in 1 M KOH, including overpotential and stability tests.

Main Results:

• FESEM confirmed well-aligned interlacing of CuO with MnO2.
• The CuO/MnO2 composite achieved a current density of 10 mA cm-2 at a low overpotential of 294 mV, outperforming pristine CuO.
• The electrocatalyst demonstrated excellent stability for over 15 hours and favorable OER kinetics with a low Tafel slope (77 mV/dec).

Conclusions:

• The facile microwave synthesis of CuO/MnO2 composite yields an efficient and stable electrocatalyst for OER.
• Enhanced porosity and surface area of the composite contribute to its superior electrochemical performance.
• This composite material shows significant promise for applications in energy conversion and storage systems.