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The Limits of Aqueous Hot‐Wire Electrochemistry: Near‐Critical and Supercritical Fluids in Electrochemical Sensors?
Author(s) -
Gründler Peter,
Degenring Daniela
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200105)13:8/9<755::aid-elan755>3.0.co;2-7
Subject(s) - supercritical fluid , superheating , aqueous solution , electrochemistry , materials science , platinum , analytical chemistry (journal) , pulse (music) , thermodynamics , electrochemical noise , chemistry , voltage , electrode , chromatography , electrical engineering , physics , engineering , biochemistry , catalysis
The experimental and theoretical limits of superheat of water in hot‐wire electrochemistry were determined. The maximum attainable temperature was ca. 250 °C during 5 ms heat pulses. The temperature–time curves were simulated by means of a new numerical calculation procedure, which took into account the temperature dependence of most physical data of water and the platinum wire. Temperature pulse voltammograms of cupric species were recorded. With 5 ms heat pulses a drastic increase in peak current and an improved signal‐to‐noise ratio was obtained.