Electrochemical characterization of PbO2-TiO2 composite prepared on stainless steel substrate by cyclic voltammetry method

Pham Thi Tot; Mai Thi Thanh Thuy; Phan Thi Binh

doi:10.15625/2525-2518/16966

Author affiliations

Authors

Pham Thi Tot Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Mai Thi Thanh Thuy Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Phan Thi Binh Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/16966

Keywords:

SS/PbO2-TiO2, cyclic voltammetry, 1-octacosanol, impedance spectroscopy

Abstract

In this study, PbO₂-TiO₂ composite was prepared on stainless steel (SS) substrate by cyclic voltammetry (CV) method from mixed solution containing TiO₂ sol-gel with size from 10 to 50 nm. In the electrochemical deposition, TiO₂ nanoparticle will disperse in the growing PbO₂ coating to create PbO₂-TiO₂ composite. These TiO₂ nanoparticles are delivered from the electrolyte bulk to the eletrode surface by diffusion and migration.The electrochemical properties of SS/PbO₂-TiO₂ electrodes were investigated in 0.5 M H₂SO₄ solution by CV, PP (potentiodynamic polarization), and EIS (electrochemical impedance spectroscopy) methods with and without UV irradiation. The results showed that the exchange current density (i_o), the value o (i_p,a and i_p,c, respectively) depended on the TiO₂ concentration. With a solution containing 2 g/L TiO₂, the value of the redox peaks is the largest and the exchange current density obtained is close the maximum value, indicating that the SS/PbO₂-TiO₂ composite electrode exhibits the best electrochemical activity under this solution condition. Due to the presence of TiO₂ in the composite, the height of the redox peaks and the exchange current density increased sharply under UV light. This demonstrated that the photo-electrochemical activity of the composite is very good, which can be used to remove dyes in wastewater by electrocatalytic oxidation.

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