Synthesis, Characterization and Electrical Properties of Reduced Graphene Oxide (RGO)/Poly-N-Methyl Pyrolle (P-NMPy)@Manganese Selenide (MnSe) Polymer Nanocomposite for Methanol Oxidation Reaction

A novel hybrid ternary polymer nanocomposite, Reduced Graphene Oxide/Poly-N-Methyl Pyrrole@Manganese Selenide (RGO/P-NMPy@MnSe), was synthesized through a chemical oxidative in situ polymerization route and evaluated as an efficient electrocatalyst for the methanol oxidation reaction (MOR) in alkaline media. Structural and morphological characterizations using FTIR, UV–Vis spectroscopy, XRD, FESEM-EDAX, and TEM confirmed the homogeneous incorporation of MnSe nanoparticles within the conductive RGO/P-NMPy framework. Electrochemical analysis via cyclic voltammetry revealed a high electrochemically active surface area (ECSA) of 68.7 m² g ⁻¹ and a superior peak current density of 36.25 µA at pH 9.0. Chronoamperometric studies demonstrated remarkable durability with a sustained steady-state current density (798.31–93.89 µA) for over 900 s, confirming excellent catalytic stability. The synergistic effects of RGO conductivity, MnSe catalytic activity, and the polymer’s structural integrity enhance electron transfer and tolerance toward poisoning intermediates. These findings highlight RGO/P-NMPy@MnSe as a low-cost, durable, and efficient electrocatalyst for direct methanol fuel cells (DMFCs) and related electrochemical energy conversion applications.