RT info:eu-repo/semantics/bookPart
T1 Progress in scanning electrochemical microscopy by coupling potentiometric and amperometric measurement modes
A1 Souto, Ricardo Manuel
A1 Izquierdo Pérez, Javier
A1 Santana, Juan José
A1 Kiss, András
A1 Nagy, Lívia
A1 Nagy, Géza
K1 Scanning electrochemical microscopy
K1 corrosion
K1 potentiometric detection
K1 ion selective electrodes
AB Scanning electrochemical microscopy (SECM) with coupled potentiometric and amperometric measurement modes is used to study corrosion reactions in aqueous environments. Whereas conventional electrochemical techniques lack spatial resolution and provide little information on behaviour at sites of corrosion initiation or at defects, the advent of scanning electrochemical microscopy is contributing to overcome these limitations when applied to the investigation of corrosion processes in situ. Ion-selective microelectrodes (ISME) and dual amperometric/potentiometric probes have been developed that can be employed as SECM tips as they exhibit sufficiently low resistances and response times. The applicability of this experimental approach is demonstrated by chemically imaging the behaviour of an iron-magnesium galvanic couple immersed in a diluted aqueous electrolyte. The dissolution of metal ions from anodic sites, the consumption of oxygen at the cathodic sites, and the local pH changes associated with both half cell reactions are thus effectively monitored
SN 13: 978-84-939843-6-6
YR 2012
FD 2012
LK http://riull.ull.es/xmlui/handle/915/19128
UL http://riull.ull.es/xmlui/handle/915/19128
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 26-dic-2024