Mechanism of anodic oxidation of molybdenum in nearly-neutral electrolytes studied by electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy
作者： Manuela Petrova , Martin Bojinov , Sandrine Zanna , Philippe Marcus
DOI: 10.1016/J.ELECTACTA.2010.12.022
关键词: X-ray photoelectron spectroscopy 、 Electrochemistry 、 Dielectric spectroscopy 、 Dissolution 、 Electrolyte 、 Valence (chemistry) 、 Analytical chemistry 、 Molybdenum 、 Oxide 、 Chemistry 、 General Chemical Engineering
摘要: Abstract Anodic oxidation of molybdenum in weakly acidic, nearly neutral and alkaline electrolytes was studied by voltammetric electrochemical impedance spectroscopic measurements a wide potential pH range. Current vs. curves were found to exhibit two pseudo-Tafel regions suggesting parallel pathways the dissolution process. Electrochemical spectra indicated presence at least reaction intermediates. X-ray photoelectron (XPS) results pointed formation an oxide containing Mo(IV), Mo(V) Mo(VI), exact ratio between different valence states depending on solution. A physico-chemical model processes is proposed set kinetic equations for steady-state current curve response are derived. The reproduce quantitatively range potentials agree qualitatively with XPS results. Subject further improvement, could serve as starting point optimization fabrication functional coatings.
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