Effects of Preparation Conditions of MnOx Coatings on Characteristics of Ti/SnO2+Sb2O3/MnOx Anodes

doi:10.3724/SP.J.1077.2006.01362

Abstract

Abstract: MnO_x coatings deposited on a Ti/SnO₂+Sb₂O₃were prepared by the thermal decomposition of Mn(NO₃)₂. Surface morphology and microstructure of the coating were investigated by X-ray diffraction and scanning electron microscopy. The electrocatalytic activity of the anodes was assessed by polarization curves and voltammetric charge at 25C and 1.0mol/L in aqueous H2SO4, and accelerated life tests were performed at 60C and 1.0mol/L in aqueous H2SO4 with an anodic current density of 4.0A/cm2. The aim of this work was to prepare anodes based on ternary oxides showing high stability and electro-catalytic activity in acid solution. The XRD analysis reveals that MnO₂ is formed at 200℃, after that, MnO₂ and Mn₂O₃coexist between 300℃ and 400℃ and above 450℃ main composition is Mn₂O₃. It is suggested that calcination temperatures affect the electro-catalytic activity and the lifetime of the anodes. The anode possesses relatively low overpotential, when the coexistence of
MnO₂ and Mn₂O₃. The Ti/SnO₂+Sb₂O₃/MnO_x electrode, the MnO_xcoatings prepared at 400℃, exhibits excellent electrocatalytic activity and higher coating stability with accelerated life of 39h.

Key words: MnOx, anode, titanium

CLC Number:

O614

WANG Ya-Qiong,GU Bin,XU Wen-Lin,LU Lu-De. Effects of Preparation Conditions of MnO_xCoatings on Characteristics of Ti/SnO₂+Sb₂O₃/MnO_x Anodes[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.01362.

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Effects of Preparation Conditions of MnO_xCoatings on Characteristics of Ti/SnO₂+Sb₂O₃/MnO_x Anodes

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