Efficient detection of ascorbic acid utilizing molybdenum Oxide@Prussian Blue/Graphite felt composite electrodes

A low cost, sensitive and efficient ascorbic acid (AA) sensor was developed using a molybdenum oxide (MoOx) and Prussian Blue (PB) nanocomposite, anchored on a graphite felt (GF) substrate (MoOx@PB/GF). MoO2 nanorods, which were fabricated by annealing of Mo-precursor, play a key role in promoting t...

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Bibliographic Details
Published in:Electrochimica acta 2019-11, Vol.322, p.134712, Article 134712
Main Authors: Yu, Laxian, Zhao, Jihua, Tricard, Simon, Wang, Qiangming, Fang, Jian
Format: Article
Language:English
Subjects:
Analytical chemistry
Ascorbic acid
Catalysis
Chemical Physics
Chemical Sciences
Condensed Matter
Coordination chemistry
Drinking water
Electrocatalytic oxidation
Electrodes
Graphite
Graphite felt
Material chemistry
Materials Science
Molybdenum
Molybdenum dioxide
Molybdenum oxides
Nanocomposites
Nanorods
Oxidation
Photoelectrons
Physics
Pigments
Polymers
Prussian blue
Selectivity
Substrates
X ray photoelectron spectroscopy
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Summary:A low cost, sensitive and efficient ascorbic acid (AA) sensor was developed using a molybdenum oxide (MoOx) and Prussian Blue (PB) nanocomposite, anchored on a graphite felt (GF) substrate (MoOx@PB/GF). MoO2 nanorods, which were fabricated by annealing of Mo-precursor, play a key role in promoting the synthesis of PB from Fe3+ and [Fe(CN)6]3-. The as-prepared electrode was characterized by scanning electronmicroscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and electrochemical methods. The modified electrode exhibited outstanding performances for the electrocatalytic oxidation of AA, with a sensitivity as high as 0.37 A/M, a good linear response in a concentration range from 0.0125 μM to 293 μM, an ultra-low detection limit of 0.0119 μM (S/N = 3), as well as a notable reproducibility and an excellent selectivity. Finally, the composite electrode gave satisfactory results for practical sample analyses, e.g. standard AA added in drinking water.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2019.134712