Premium
A new indicator electrode for oxygen sensors
Author(s) -
Nei Lembit
Publication year - 1995
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/elan.1140070511
Subject(s) - electrode , cathodic protection , electrochemistry , alloy , galvanic cell , materials science , oxygen sensor , oxygen , aqueous solution , rotating disk electrode , inorganic chemistry , analytical chemistry (journal) , cyclic voltammetry , chemistry , metallurgy , chromatography , organic chemistry
The electrochemical reduction of O 2 was studied at Ni‐Cu alloy electrodes in aqueous alkaline solution (0.1–6.0 M KOH) and in unbuffered neutral solution (0.1–2.0 M KCl) using the rotating disk electrode technique. Voltammetric measurements showed that the overall O 2 reduction process at the electrodes containing 70–90% Cu is transport‐limited at cathodic potentials, and that they can be used as indicator electrodes for galvanic‐type oxygen sensors. An industrially produced Ni‐Cu alloy “melhior”, which contains ∼ 30% Ni, was also studied, and this alloy proved to be an excellent O 2 reduction catalyst. Melhior electrodes were utilized as indicator electrodes for oxygen sensors, and showed high output current stability and a long lifetime (exceeding one year).