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Electrocatalysis and flow detection at a glassy carbon electrode modified with a thin film of oxymanganese species
Author(s) -
Taha Ziad,
Wang Joseph
Publication year - 1991
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.1140030313
Subject(s) - amperometry , electrocatalyst , glassy carbon , electrode , hydrogen peroxide , carbon fibers , substrate (aquarium) , materials science , chemistry , inorganic chemistry , analytical chemistry (journal) , chemical engineering , electrochemistry , chromatography , composite material , organic chemistry , cyclic voltammetry , oceanography , composite number , engineering , geology
A modified electrode prepared by dipping a glassy carbon substrate into a 0.027 M MnCl 2 /1.4 M NaOH solution and cycling the potential between −0.5 and +0.4 V(vs. AA/AgCl) greatly reduces the overvoltage for the oxidation of various hydrazines and hydrogen peroxide. The new electrocatalytic surfaces facilitate the amperometric detection of these compounds in flowing streams. Effects of pH, flow rate, operating potential, film thickness, concentration, and other variable on the catalytic response are explored. The electrode response is very stable. Detection limits at the femto‐ and picomole levels and relative standard deviations less than 1.3% are reported.