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A new FTO/TiO2/PbO2 electrode for eco-friendly electrochemical determination of chemical oxygen demand

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Abstract

Eco-friendly chemical oxygen demand (COD) sensors are highly desired with respect to the importance of COD determination in environmental protection. In this work, a new FTO/TiO2/PbO2 (FTO = fluorine-doped tin oxide) electrode was fabricated with a two-step method and used as an eco-friendly electrochemical COD sensor. The interlayer TiO2 was employed to strengthen the adhesion of PbO2 on the FTO substrates by providing a large TiO2/PbO2 interface area. The effects of the factors including applied potential, supporting electrolyte concentration and stirring speed on the sensing performance were investigated. Under the optimized conditions, linear responses to the COD of water with different COD sources were achieved, and a linear range from 5 to 120 mg/L was obtained in the case of sucrose as the COD source. The relative standard deviations (RSD) were determined to be less than 9% for the glucose solutions with the COD of 7.5, 12.5 and 17.5 mg/L. For real sample analysis, the obtained results were comparable with those measured with the conventional dichromate method, with a relative error less than 11%.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2020YFB2009000) and the National Natural Science Foundation of China (No. 22074137).

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Authors and Affiliations

  1. School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, 130022, China

    Lei Wang & Yunhui Li

  2. Zhongshan Institute of Changchun University of Science and Technology, Zhongshan, 528437, China

    Lei Wang & Yunhui Li

  3. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Lei Wang, Yuehan Zhang, Xiaoxuan Sun, Junfeng Zhai & Shaojun Dong

  4. University of Science and Technology of China, Hefei, 230026, China

    Xiaoxuan Sun & Shaojun Dong

  5. College of Chemistry, Jilin University, Changchun, 130012, China

    Yuehan Zhang

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  1. Lei Wang
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  2. Yuehan Zhang
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  3. Xiaoxuan Sun
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  4. Yunhui Li
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  5. Junfeng Zhai
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Correspondence to Yunhui Li, Junfeng Zhai or Shaojun Dong.

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A new FTO/TiO2/PbO2 electrode for eco-friendly electrochemical determination of chemical oxygen demand

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Wang, L., Zhang, Y., Sun, X. et al. A new FTO/TiO2/PbO2 electrode for eco-friendly electrochemical determination of chemical oxygen demand. Nano Res. 16, 11042–11047 (2023). https://doi.org/10.1007/s12274-023-5830-8

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  • DOI: https://doi.org/10.1007/s12274-023-5830-8

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