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Voltammetric characterization of activated carbons in modified carbon paste electrodes
Author(s) -
Kaplan Jeffrey D.,
Marsh John H.,
Orchard S. Walter
Publication year - 1993
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.1140050521
Subject(s) - hydroquinone , redox , cyclic voltammetry , electrode , carbon fibers , glassy carbon , square wave , activated carbon , voltammetry , chemistry , quinone , electrochemistry , analytical chemistry (journal) , materials science , inorganic chemistry , organic chemistry , physics , composite material , voltage , quantum mechanics , adsorption , composite number
Carbon paste electrodes (CPEs), modified by the addition of small amounts of finely powdered activated carbon (AC) were studied using cyclic (CV) and square wave voltammetry (SWV). Cyclic voltammograms revealed the expected increase in surface area associated with the presence of the activated carbon but did not reveal any specific redox peaks. Square wave voltammograms of both the modified and unmodified electrodes obtained in acidic solution were characterized by well‐defined redox peaks whose behavior was consistent with that expected for couples of the quinone/hydroquinone type. The modified electrodes showed generally larger peaks than the unmodified ones. Regardless of the origin of the activated carbons, the square wave voltammetric response was fairly similar, and it was not possible to confidently differentiate between the different types on this basis.