Journal
MICROCHIMICA ACTA
Volume 164, Issue 1-2, Pages 133-138Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-008-0046-x
Keywords
Platinum-palladium alloy; Nanoparticles; Formaldehyde; Electrocatalytic oxidation
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Funding
- National Natural Science Foundation of China [20247002]
- Ministry of Science and Technology of China [2005CB724201]
- Beijing Natural Science Foundation [8062010, 8012007]
- Beijing Municipal Education Commission Scientific and Technological Project Foundation [Km200310005008]
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A novel electrochemical sensor for the determination of formaldehyde is introduced based on electrodepositing nanostructured platinum-palladium alloy in Nafion film-coated glassy carbon electrode. Bimetallic Pt-Pd nanoparticles are found to be uniformly dispersed in Nafion film, as confirmed by scanning electron microscopic analysis. Energy dispersed X-ray analysis is used to characterize the composition of metal present in the nanoparticle-modified electrodes. The electrocatalytical behavior of the electrode is investigated by cyclic voltammetry and linear sweep voltammetry. Experimental results show that the electrode displays a remarked electrocatalytic activity for the oxidation of formaldehyde and exhibits a linear relationship in the range of 10 mu M to 1 mM, with a detection limit of 3 mu M in acidic solution. The low detection limit, wide linear range, and high sensitivity of the sensor make it valuable for further application.
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