Fabrication of CaTiO₃ modified glassy carbon electrode-based hydrogen peroxide sensor

Herein, we reported the construction of hydrogen peroxide (H₂O₂) sensor using calcium titanate modified screen printed electrode (CaTiO₃@SPE). The CaTiO₃ has been synthesized via hydrothermal method using calcium nitrate tetrahydrate and titanium butoxide as the Ca and Ti source. The CaTiO₃ was characterized by many physiochemical techniques such as powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Brunauer–Emmett–Teller (BET) and scanning electron microscopy (SEM). The XRD analysis revealed the existence of decent crystalline nature in the synthesized material, while EDX results demonstrated its good phase purity. The SEM micrographs suggested that CaTiO₃ has flakes-like surface structure. The BET results also indicated that CaTiO₃ has specific surface area of 57.6 m²/g. Furthermore, CaTiO₃ was used as the electrode material and CaTiO₃@SPE has been constructed using drop-casting method. The fabricated CaTiO₃@SPE was used for the sensing of H₂O₂ using cyclic voltammetry and linear sweep voltammetry methods. The CaTiO₃@SPE exhibited reasonable limit of detection of 0.08 µM with good selectivity, stability and repeatability.