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In this study, a novel cobalt-doped cerium oxide (CeO2)on reduced graphene oxide (rGO) substrate was successfully prepared through a hydrothermal method. The comprehensive characterization of the synthesized nanocomposite involved X-ray diffraction studies (XRD), Raman spectrum analysis, High Resolution Transmission Electron microscopy (HRTEM), and Field Emission Electron Microscopy (FE-SEM). The effective surface area of CeO2/rGO and Co-CeO2/rGO was determined using the Randles-Sevecik equation, revealing values of 4.02X10-5 cm2 and 6.35X10-5 cm 2, respectively. Cyclic Voltammetry (CV) was employed to investigate the electrochemical reversibility behavior, demonstrating promising results for Co-CeO2/rGO nanocomposite. Electrochemical impedance spectroscopy(EIS) further highlighted low charge transfer resistance (Rct) and enhanced double-layer capacitance (Cdl). Notably, the synthesized nanocomposite exhibited excellent electrocatalytic activity for methanol and formic acid oxidation in an acidic medium. Overall, this work provides valuable insights into the synthesis characterization, and electrochemical performance of Co-CeO2/rGO nanocomposite, showcasing their potential applications in energy-related processes. [ABSTRACT FROM AUTHOR]

The corrosion behavior of Aluminium 7075 reinforced with SiC metal matrix composites was investigated in different concentrations of phosphoric acid medium and potassium hydroxide medium at 25°C. The study was done by electrochemical method using Tafel polarization techniques and electrochemical impedance spectroscopy (EIS) technique. The surface morphology was investigated using scanning electron microscope (SEM). The results showed that the Aluminium 7075 matrix undergoes intense corrosion in sodium hydroxide medium than in phosphoric acid medium. The corrosion rate of SiC reinforced Aluminium 7075 composites increases with an increase in the concentration of acid as well as alkali. The corrosion rate decrease with increase in the percentage of SiC particulate in Aluminium 7075. Desirable reaction mechanism was proposed for the corrosion of Aluminium 7075 in phosphoric acid medium and potassium hydroxide medium. The results obtained by Tafel polarization and electrochemical impedance spectroscopy (EIS) technique were in good agreement with each other. [ABSTRACT FROM AUTHOR]