Abstract
A Nafion/multi-wall carbon nanotubes (MWNT) composite film-modified electrode was fabricated. The modified electrode showed excellent electrocatalytic activity toward ascorbic acid (AA) and uric acid (UA) in 0.1-mol L−1 NaCl medium (pH 6.5). Compared to the bare electrode that only displayed a broad and overlapped oxidation peak, the Nafion/MWNT film-modified electrode not only remarkably enhanced the anodic peak currents of AA and UA but also avoided the overlapping of the anodic peaks of AA and UA with a 320-mV separation of both peaks. Under the optimized conditions, the peak currents of AA and UA were proportional to their concentration at the ranges of 8.0 × 10−5 to 6.0 × 10−3 mol L−1 and 6.0 × 10−7 to 8.0 × 10−5 mol L−1, respectively. The proposed method was used for the detection of AA and UA in real samples with satisfactory results.
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Acknowledgments
The authors gratefully acknowledge the support of this work by the National Natural Science Foundation of China (No. 20472076) and the Natural Science Foundation of Henan Province in China (No. 0512001400).
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Li, G., Yang, S., Qu, L. et al. Simultaneous voltammetric determination of ascorbic acid and uric acid using a Nafion/multi-wall carbon nanotubes composite film-modified electrode. J Solid State Electrochem 15, 161–166 (2011). https://doi.org/10.1007/s10008-010-1088-7
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DOI: https://doi.org/10.1007/s10008-010-1088-7