One-pot synthesis and hydrogen peroxide electrochemical sensing of 3D TiO₂/MnO₂ nanorods assembled microspheres

Nanorods assembled 3D microspheres of TiO₂/MnO₂ were prepared via a simple one-pot hydrothermal approach. The resultant composite material exhibited remarkable electrocatalytic activity for hydrogen peroxide (H₂O₂) in comparison to each single component. The electrochemical sensor constructed with TiO₂/MnO₂ exhibited a linear relationship within the range 0.0001-5.6 mmol·L^-1 for H₂O₂. The limit of detection (LOD) and sensitivity for H₂O₂ were 0.03 µmol·L^-1 (S/N = 3) and 316.6 µA (mmol·L^-1)^-1 cm^-2. Moreover, this sensor can be employed to detect trace amount of H₂O₂ in serum and urine samples successfully, supporting an insight and strategy for a more sensitive electrochemical sensor.