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Title: In situ chemical probing of the electrode-electrolyte interface by ToF-SIMS

A portable vacuum interface allowing direct probing of the electrode-electrolyte interface was developed. A classical electrochemical system consisting of gold working electrode, platinum counter electrode, platinum reference electrode, and potassium iodide electrolyte was used to demonstrate real-time observation of the gold iodide adlayer on the electrode and chemical species as a result of redox reactions using cyclic voltammetry (CV) and the time-of-flight secondary ion mass spectrometry (ToF-SIMS, a vacuum-based surface analytical technique) simultaneously. This microfluidic electrochemical probe provides a new way to investigate the surface region with adsorbed molecules and region of diffused layer with chemical speciation in liquids in situ by surface sensitive techniques.
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Publication Date:
OSTI Identifier:
Report Number(s):
47299; 47740; 42330
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Lab on a Chip, 14(5):855-859
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
Country of Publication:
United States
electrode-electrolyte interface; ToF-SIMS; chemical imaging; cyclic voltammetry; gold adlayer; redox reaction; Environmental Molecular Sciences Laboratory