Photo-driven Interfacial Electron Transfer Reduction of cis-[Co(phen) 2 Cl 2 ]Cl Complex by Heterojunctioned CeO 2 /SnO 2 Nanocomposite with Insight on the Role of Supercapacitance

Abstract

Nano CeO2/SnO2 composite was successfully synthesised using the hydrothermal method. Nano-CeO2/SnO2 is one of the most widely used photocatalysts in metal oxide-semiconductors and has good photocatalytic activity. Experimental and spectroscopic approaches confirmed the structure and shape of the nanocomposite according to X-ray diffraction, transmission electron microscopy and scanning electron microscopy results. Spectral peaks are shown to migrate with the CeO2/SnO2 composite in experiments using Raman and opacity (PL). The magnetic properties of SnO2 (20.54 emu/g) are higher than CeO2 (6.875 emu/g) nanoparticles and nanocomposite (4.822 emu/g). The different oxidation states of Ce and Sn, which act as active sites in the electrocatalytic activity of this nanocomposite material, were observed using X-ray photoelectron spectroscopy (XPS). The capability of the CeO2/SnO2 composite was demonstrated by additional galvanic charge-discharge experiments at various current densities, cyclic voltammetry measurements at various scan rates (the maximum capacitance value of 718 Fg− 1 from CV and 721 Ag− 1 from GCD). Surface absorption of cis-[Co(phen)2Cl2]Cl curve with binary solvent catalysis, measured the rate (k = 0.0032 sec− 1). Reduction of cis-[Co(phen)2Cl2]Cl by nano-CeO2/SnO2 was traced to the production of Co(II) ion, which was shown to be catalytically efficient by UV-Vis response curves. Lattice analysis showed that the catalytic activity was very effective in binary solvent solution (H2O/PriOH) (254 nm and 365 nm lamp, k = 0.0625 sec− 1 and k = 0.0305 sec− 1) and then in pure water (k = 0.0018 sec− 1). Thus, the enhanced photocatalytic activity of the nano-CeO2/SnO2 material can be attributed to the excellent charge separation and electron transport for reduction efficiency of the photogenerated charge carriers.