A Photoelectrochemical Sensor for Methanol based on Its Oxidation at TiO2 Thin Film Modified Ti Electrode

In this research, the TiO2 film layered titanium foil (Ti/TiO2) electrode was performed for photo-assisted electrocatalytic determination of methanol in aqueous solution. TiO2 film was fabricated on the surface of titanium foil using anodizing this foil. The photoelectrochemical activity of methanol on the surface of the Ti/TiO2 electrode was investigated by cyclic voltammetry and hydrodynamic photoamperometry techniques. Also, hydrodynamic photoamperometry method was employed for methanol determination and for obtaining the best response. Also, pH and bias voltage were optimized based on the photocurrent differences value in the absence and presence of methanol. It was showed that the electrode photocurrent was linearly related to the methanol concentration in the range of 0.070-0.46 mM. The limit of detection was led to be 7.5 μM (3σ).