The Peruvian government agencies CONCYTEC and FONDECYT/World Bank (contract 026-2019 FONDECYTBMINC.INV) .

Bimetallic oxides have significant attraction as supercapacitor electrode materials due to their highly reversible redox processes, which are commonly associated with their surface chemistry and morphological features. Here, we report the synthesis, characterization, and electrochemical evaluation of bimetallic oxides with different molar compositions of Co and V (Co0.6V0.4, Co0.64V0.36, Co0.68V0.32, and Co0.7V0.3 denoted as S1, S2, S3, and S4 samples, respectively). The materials were synthesized by a modified solvothermal method using glycerol as a stabilizing agent, characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy–energy-dispersive X-ray spectroscopy, X-ray fluorescence spectroscopy, N2 adsorption isotherms, cyclic voltammetry, and galvanostatic charged/discharged in a three-elect...

This study investigates the influence of electropolymerization conditions on the deposition of polypyrrole (PPy) onto cotton-derived carbon fiber (CF) modified with reduced graphene oxide (rGO) for supercapacitors applications using an experimental/theorical approach. The surface modification of CF by rGO and/or by PPy electrodeposited at 10, 25 and 50 mV s−1 was thoroughly examined physicochemical and electrochemically. Composite electrodes comprising CF-rGO-PPy, synthesized via electropolymerization at 25 mV s−1, demonstrated a remarkable increase in capacitance, showcasing ∼742 F g−1 compared to 153 F g−1 for CF. SEM, N2-surface area, XPS, and TD-DFT approach revealed that the higher capacitance observed in CF-rGO-PPy electrodes underscores the influence of morphology and charged nitrogen species on the electrochemical performance of these modified electrodes. Notably, this ...