RT info:eu-repo/semantics/article
T1 The effect of electric field on potentiometric Scanning Electrochemical Microscopic imaging
A1 Souto, Ricardo Manuel
A1 Kiss, András
A1 Filotás, Dániel
A1 Nagy, Géza
K1 scanning electrochemical microscopy
K1 potentiometry
K1 ion-selective microelectrode
K1 galvanic corrosion
K1 electric field
AB Potentiometric Scanning Electrochemical Microscopy (SECM) is a powerful tool in corrosion science. It allows the selective imaging of a particular ionic species released at the anodic sites in a corrosion microcell, by using ion-selective micro-electrodes (ISMEs) as scanning probes. An often studied process is galvanic corrosion, which involves two dissimilar metals in electrical contact, that are immersed in the same electrolyte phase. The measured potential of the ISME is thought to depend only on the activity of the primary ion. However, an electric field is also formed as a result of thepotential difference between the surfaces of the galvanic pair, which has a direct influence on the potential of the sensing microelectrode; the measured potential is the sum of these two contributions. The potential difference caused by the electric field can be substantially large, exceeding that of the potential difference associated with the activity of the primary ion. In this paper, we present experimental evidence of this feature, and investigate the extent to which it influences the final chemically-resolved image.
YR 2017
FD 2017
LK http://riull.ull.es/xmlui/handle/915/19012
UL http://riull.ull.es/xmlui/handle/915/19012
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 18-nov-2024