The development of an economical, abundant, stable, and greatly active electrocatalyst for water oxidation is extremely important for future energy conversion system. Electrochemical water splitting is a new move toward H and O gas production. It can be used in sustainable and pollution-free energy conversion applications. In this work, TiO-CeO nanocomposites were successfully synthesized with different molar ratios by facile hydrothermal method for electrochemical water oxidation. Mixed phase structure of TiO-CeO nanocomposites was confirmed by X-ray diffraction spectra and well identified by highest peak of TiO in 2θ values of 33.0 and CeO in 2θ values of 28.5. The characteristic peaks from Raman and photoluminescence spectroscopy further confirmed TiO-CeO nanocomposite formation. Existence of multidimensional nanostructures such as nanoparticles and small nanocubes of TiO-CeO nanocomposites were investigated by scanning electron microscope images. Mesoporous nature of TiO-CeO nanocomposites was further analyzed by Brunauer-Emmett-Teller analysis. The high surface area could benefit the TiO-CeO nanocomposites with greatly improved oxygen evolution reaction (OER) performance. In three molar ratios, 1:3 M ratios of TiO-CeO nanocomposites showed high catalytic action at overpotential of 244 mV. The best OER electrocatalyst was obtained by 1:3 M ratios of TiO-CeO nanocomposites, which exhibited high current density and high specific capacitance values of 238 mA/g and 517 F/g, respectively. Therefore, Ti/Ce molar ratio played a crucial role in enhancing the OER performance.
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