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Effect of hydrogen fluoride on the anodic behavior of glassy carbon in aqueous and mixed aqueous solutions
Author(s) -
Noel Michael,
Santhanam Raman,
Ravikumar Musuwathi K.,
Flora Mangalam Francisca
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.1140070413
Subject(s) - chronoamperometry , redox , aqueous solution , cyclic voltammetry , chemistry , inorganic chemistry , glassy carbon , electrochemistry , ferricyanide , ferrocyanide , voltammetry , electrode , organic chemistry
The electrochemical behavior of the glassy carbon electrode (GCE) in aqueous 1.0–20.0 M HF solutions and in mixed solvents containing 15.0 M HF (25 vol.%) was investigated using cyclic voltammetry, chronoamperometry and surface microscopic analysis. The GCE shows three surface redox peaks in aqueous HF solutions which become distinct at higher HF concentrations. Fresh surface oxidation and slight surface roughening occurs above 1.6 V. The background current increases significantly due to strong anodic polarisation in HF solutions. However, the electrode activity as measured by the response of the ferricyanide/ferrocyanide redox system remains unaltered. In mixed solvent systems, the surface redox currents and fresh surface oxidation decrease significantly. The oxygen evolution occurs at less positive potentials. Thus the electrochemical activity in such systems is much better.