A novel method for generating quantitative local electrochemical impedance spectroscopy

Journal Article · Wed Apr 01 00:00:00 EST 1992 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2069332· OSTI ID:5023548

Lillard, R S ^[1]; Moran, P J ^[2]; Isaacs, H S ^[3]

---

1. Dept. of Materials Science and Engineering, Johns Hopkins Univ., Baltimore, MD (US)
2. Dept. of Mechanical Engineering, United States Naval Academy, Annapolis, MD (US)
3. Dept. of Applied Science, Brookhaven National Lab., Upton, NY (US)

This paper reports on a local electrochemical impedance spectroscopy (LEIS) technique for mapping the ac impedance distribution, as a function of frequency, of an electrode. In LEIS, as in traditional ac impedance methods, a sinusoidal voltage perturbation between the working and reference electrode is maintained by driving an ac current between the working electrode and a distant counterelectrode with a potentiostat. Local ac impedances are then derived from the ratio of the applied ac voltage and the local ac solution current density. The local ac current density is obtained from potential difference measurements near the electrode surface using a probe consisting of two micro-electrodes. By measuring the ac potential difference between the micro-electrodes, and knowing their separation distance and the solution conductivity, the local ac solution current density is derived. The accuracy of the local ac impedance data generated with this technique was established by investigating two model systems.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5023548
• Journal Information: Journal of the Electrochemical Society; (United States), Vol. 139:4; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Ta
ELECTRODES
ELECTRIC IMPEDANCE
ALTERNATING CURRENT
CURRENT DENSITY
ELECTROCHEMISTRY
POTENTIOSTATS
SPECTROSCOPY
CHEMISTRY
CURRENTS
ELECTRIC CURRENTS
IMPEDANCE
MEASURING INSTRUMENTS
400400* - Electrochemistry
664200 - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)
661220 - Particle Beam Production & Handling
Targets- (1992-)