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[Display omitted] • Facile synthesis of novel MnO 2 /polyaniline/graphitic carbon nitride nanocomposite. • MnO 2 /PANI-GCN modified GS electrode via electrochemical deposition method. • MnO 2 /PANI-GCN modified electrode exhibits better specific capacitance of 318 F/g. • The proposed electrode had shown the capacitive retention of 82 % up to 1000 cycles. • MnO 2 @PANI-GCN electrode show lower charge transfer resistance. Supercapacitors are gaining popularity as a component in energy storage systems due to their quick charge/discharge rates and high specific power. A facile method is introduced in this research to fabricate a novel ternary nanocomposite-based manganese oxide decorated on polyaniline/graphitic carbon nitride (PANI-GCN) nanohybrid modified graphite sheet (GC) electrode via the electrochemical deposition method. As-prepared nanocomposite modified electrode morphology, elemental analysis, surface functionalities studies, and crystalline behavior are proved using SEM, Energy Dispersive Analysis, FT-IR, and XRD techniques. The electrochemical measurements are obtained by CV, GCD, and EIS. For Bare GS, PANI, and PANI-GCN, the solution resistance (Rs) that gauges the ionic conductivity across the electrolyte, was measured to be 60.57 Ω, 7.28 Ω, and 6.19 Ω, respectively. A greater specific capacitance of 318 F/g at 1 A/g was displayed by the developed MnO 2 @PANI-GCN electrode and lower charge transfer resistance over the PANI and PANI-GCN electrodes. Furthermore, the proposed electrode has shown the capacitive retention of 80.62% up to 1000 cycles. These results indicate that the ternary nanocomposite MnO 2 @PANI-GCN shows significant electrochemical properties towards energy storage applications. [ABSTRACT FROM AUTHOR]

[Display omitted] • Simple two-step electro-fabrication of gold and polydiphenylamine over FTO electrode. • Raspberry–like microspheres of Au decorated over PDPA conducting polymer network. • Synergistic effect of gold microspheres and PDPA nanonetwork shows efficient MOR. • R ct value of FTO/PDPA/AuMS is lower than FTO/PDPA shows low charge resistance. • Excellent stability of FTO/PDPA/AuMS electrode compared with FTO/PDPA. In this work, a simple two-step electrodeposition strategy has been successfully developed to fabricate morphology-controlled gold microspheres (AuMS) decorated polydiphenylamine (PDPA) nanohybrid modified FTO electrode. The physicochemical characterization of PDPA/AuMS modified electrode has been explored using XRD and SEM/EDX mapping techniques. Results showed the controlled synthesis of uniform-sized raspberry-like AuMS were decorated in the PDPA matrix to form the electrocatalytically active PDPA/AuMS nanohybrid material on the FTO electrode. As-fabricated PDPA/AuMS modified FTO electrode was used as an efficient electrocatalyst for methanol oxidation reaction under an alkaline environment for fuel cell applications. Cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy techniques were employed to investigate the as-prepared electrode's electrochemical responses and methanol oxidation reaction (MOR). PDPA/AuMS hybrid electrode showed 1.04 mA/cm2 as the current density at a lower scan rate (50 mV/ sec) with a lower potential value of 0.43 V, which indicates the excellent electrocatalytic activity of the fabricated electrode. Moreover, the as-prepared electrode showed more extended stability and durability (60 min) towards MOR due to the combined existence of AuMS and PDPA matrix, which enhances the catalytic property. Based on the above results, an as-prepared PDPA/AuMS nanohybrid composite can be applied as a potential electrocatalyst/alternative electrode for direct methanol fuel cell (DMFC) applications. [ABSTRACT FROM AUTHOR]