The lattice distortion and electrocatalytic activity are investigated by the mono-substituent of Mn with different concentrations to generate localized states in the electronic structure of SrTiO. The sol-gel approach has been employed to fabricate SrTiO and SrTiMnO nanostructures (NSs). The structural analysis indicates Mn incorporation into Ti sites of SrTiO, which shifts the lattice towards a higher diffraction angle with a single-phase cubic structure. The optical absorption spectra exhibit a decrease in band gap from 3.27 to 1.89 eV and reveal the shift in band edge positions towards the visible region. XPS analysis is carried out to confirm the formation of oxygen vacancies and valence band edge position. For SrTiMnO, OER and HER have the overpotential of 445 and 157 mV at a current density of 100 and 10 mA cm. Hence, the substitution of Mn (x = 0.12) into SrTiO lattice results in lattice distortion that enhances the electrochemical performance compared to SrTiO. The current work manifestly established the optimal Mn composition (x = 0.12) in SrTiO lattice as desirable materials with defective valence states for required electrocatalytic redox potential as well as the acceleration of charge transfer kinetics towards water splitting applications.
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