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A pair of polyaniline (PANIs) samples was prepared from HCl or H2SO4 electrolytes containing 0.01 M of aniline, and then subjecting them to electropolymerization. The morphology, structure, and properties of the samples were characterized using scanning electron microscope, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. The results demonstrate that the capacitance and morphology of the product depend exclusively on the reactive medium used. The PANI was used as a material electrode in a supercapacitor, and the electrochemical performance of the elaborated electrodes was evaluated using cyclic voltammetry, galvanostatic charge/discharge measurement, and electrochemical impedance spectroscopy. The optimal results for the specific capacitance of the PANI films were achieved under a 5-mVs−1 scan rate, ranging from 410.35 F/g for the FTO/PANI-H2SO4 to 758.72 F/g for the FTO/PANI-HCl. [ABSTRACT FROM AUTHOR]

[Display omitted] • The Ag-MnO 2 Ferns-like were synthesized successfully via pulse electrodeposition (PE) method. • Ag-MnO 2 electrode was used as catalyst for hydrogen peroxide reduction reaction. • Ag-MnO 2 exhibits excellent electrocatalytic performance for H 2 O 2 reduction. In this study, Manganese dioxide (MnO 2) decorated with silver nanoparticles (Ag), was successfully synthetized by pulse electrodeposition (PE) onto fluorine doped tin oxide (FTO) substrate. The as-prepared Ag-MnO 2 /FTO sample has been characterized using X-ray diffraction, scanning electron microscopy and Impedance Spectroscopy. The micrographs revealed that the deposited film of silver nanoparticles is homogeneous and exhibits ferns-like microstructure. Electrochemical investigation indicates that the Ag-MnO 2 composite possess an excellent performance toward hydrogen peroxide (H 2 O 2) reaction in alkaline medium, this electrode could be used as cathode in feul cells. [ABSTRACT FROM AUTHOR]