6533b823fe1ef96bd127ea59

RESEARCH PRODUCT

Effect of Anions and Oxygen on the Kinetics of the Anodic Dissolution of Nickel

José Juan García-jareñoJoan GregoriDavid Giménez-romeroFrancisco Vicente

subject

Aqueous solutionPassivationRenewable Energy Sustainability and the EnvironmentChemistryInorganic chemistrychemistry.chemical_elementCondensed Matter PhysicsOxygenSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsDielectric spectroscopyMetalNickelchemistry.chemical_compoundvisual_artMaterials ChemistryElectrochemistryvisual_art.visual_art_mediumSulfateDissolution

description

An electrochemical impedance spectroscopy study on electrochemical dissolution and active/passive transition of polycrystalline nickel in acid media has been performed in sulfate and nitrate aqueous solutions. Oxygen favors the nickel electrodissolution in a nitrate aqueous acid medium, but the dissolution decreases in the sulfate medium due to nickel passivation. The anion and oxygen effect is analyzed from a model where Ni(I) species are stabilized on the Ni metal surface and all anions present in the solution compete in the neutralization of Ni(I) and Ni(II) and in the solubilization of Ni(II).

https://doi.org/10.1149/1.2191227