Nanostructured PbO2-PANi composite materials for electrocatalytic oxidation of methanol in acidic sulfuric medium

Thi Thanh Thuy Mai, Thi Binh Phan, Thi Tot Pham and Huu Hieu Vu

Abstract

Hybrid materials based on PbO₂ and PANi were prepared by cyclic voltammetry combined with chemical method. Firstly, PbO₂ and PbO₂-PANi were deposited on stainless steel by cyclic voltammetry (CV) at a scan rate of 100 mV s⁻¹. Next, they were immersed in acidic aniline solution (0.1 M) to form new fresh PbO₂-PANi composites. The properties of materials were characterized by x-ray diffraction, IR- spectroscopy, scanning electron microscopy and transmission electron microscopy. The electrocatalytic oxidation for methanol of all PbO₂-PANi layers was investigated in acidic medium by potentiodynamic measure at a scan rate of 100 mV s⁻¹ in the range of 1.4 V to 2.2 V versus Ag/AgCl/saturated KCl electrode. The obtained results indicated that the composites prepared by above combined method could significantly enhance the electrocatalysis for oxidation of methanol