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Development and Evaluation of a Nanoporous Iron (Hydr)oxide Electrode for Phosphate Sensing
Author(s) -
Moss Rachel E.,
Jackowski Jennifer J.,
de Souza Castilho Michelle,
Anderson Marc A.
Publication year - 2011
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.201100118
Subject(s) - ferrihydrite , nanoporous , hematite , dielectric spectroscopy , phosphate , electrode , cyclic voltammetry , iron oxide , inorganic chemistry , oxide , materials science , electrochemistry , chemistry , analytical chemistry (journal) , nanotechnology , adsorption , environmental chemistry , metallurgy , organic chemistry
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 ( θ ) that shifts with increasing phosphate, and, at chosen frequencies, θ values were fitted for the range 1 nM to 0.1 mM phosphate at pH 4 and pH 7 in 5 mM NaClO 4 .