Development and Evaluation of a Nanoporous Iron (Hydr)oxide Electrode for Phosphate Sensing
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Advisor
Coadvisor
Graduate program
Undergraduate course
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Volume Title
Publisher
Wiley-v C H Verlag Gmbh
Type
Article
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Acesso restrito
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Abstract
Nanoporous iron (hydr) oxide electrodes are evaluated as phosphate sensors using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The intensity of the reduction peak current (I-cp) of the ferrihydrite working electrode is tied to phosphate concentration at low pH; however, a hematite electrode combined with the use of EIS provided reliable sensing data at multiple pH values. Nanoporous hematite working electrodes produced an impedance phase component (theta) that shifts with increasing phosphate, and, at chosen frequencies, theta values were fitted for the range 1 nM to 0.1 mM phosphate at pH 4 and pH 7 in 5 mM NaClO4.
Description
Keywords
Ion-selective electrodes, Iron (hydr)oxides, Nanoporous coatings, Phosphate sensor, Sol-gel methods
Language
English
Citation
Electroanalysis. Weinheim: Wiley-v C H Verlag Gmbh, v. 23, n. 7, p. 1718-1725, 2011.
