Electrocatalytic oxidation of nitric oxide at nano-TiO2/Nafion composite film modified glassy carbon electrode |
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Authors: | Yazhen Wang Chunya Li Shengshui Hu |
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Affiliation: | (1) Department of Chemistry, Wuhan University, Wuhan, 430072, People’s Republic of China;(2) State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Beijing, 100080, People’s Republic of China |
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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 (NO2−). |
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Keywords: | Nitric oxide radical Nanocrystalline TiO2 Chemically modified electrode Nafion |
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