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Electrocatalytic oxidation of nitric oxide at nano-TiO2/Nafion composite film modified glassy carbon electrode

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Abstract

A novel nanocrystalline TiO2 (nano-TiO2) and Nafion composite film modified glassy carbon electrode has been developed for the determination of nitric oxide (NO) radical in an aqueous solution. This modified electrode can be employed as a NO sensor with a low detection limit, fast response, high sensitivity and selectivity. Two apparent anodic peaks were observed at 0.67 and 0.95 V at the nano-TiO2 modified glassy carbon electrode by differential pulse voltammetry (DPV). After further modification with a thin film of Nafion, which was capable of preventing some anionic interference such as nitrite and ascorbic acid, only one peak appeared and the peak current enhanced greatly. The chronocoulometric experimental results showed NO was oxidized by one-electron transfer reaction at the composite film modified electrode. The amperometric responses increased linearly with the concentrations of NO ranging from 3.6×10−7 mol/L to 5.4×10−5 mol/L. The detection limit was estimated to be 5.4×10−8 mol/L. In this sensor system, the modification film provides complete selectivity for NO over nitrite anions (NO −2 ).

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (No. 60171023) and by the provincial Natural Science Foundation of Hubei (No. 2004ABA116).

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Authors and Affiliations

  1. Department of Chemistry, Wuhan University, Wuhan, 430072, People’s Republic of China

    Yazhen Wang, Chunya Li & Shengshui Hu

  2. State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Beijing, 100080, People’s Republic of China

    Yazhen Wang & Shengshui Hu

Authors
  1. Yazhen Wang
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  2. Chunya Li
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  3. Shengshui Hu
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Correspondence to Shengshui Hu.

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Wang, Y., Li, C. & Hu, S. Electrocatalytic oxidation of nitric oxide at nano-TiO2/Nafion composite film modified glassy carbon electrode. J Solid State Electrochem 10, 383–388 (2006). https://doi.org/10.1007/s10008-005-0010-1

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  • DOI: https://doi.org/10.1007/s10008-005-0010-1

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