Nafion® Coated Electropolymerised Flavanone-based pH Sensor

Miranda, Monica; Carvetta, Clara; Sisodia, Neel; Shirley, Luke; Day, Cristina; McGuinness, Kay; Wadhawan, Jay D.; Lawrence, Nathan S.

Abstract

This work summarizes the electrochemical response of flavanone carbon composite electrodes in comparison with Nafion®-coated flavanone carbon composite electrodes, for use as voltammetric pH sensors in both buffered and low-buffered media. Square wave voltammetric measurements suggest the peak potential achieved from the electrochemical polymerization after the electron-proton oxidation responds with accuracy to buffered pH solutions for both coated and non-coated electrodes, with a potential shift of 55.1 mV and 54.6 mV per pH unit respectively. However, a considerable improvement in stability, accuracy and sensitivity is provided by the proton-transfer Nafion® layer in CO2 bubbled sea water. Furthermore, Nafion®-coated flavanone carbon composite electrodes predicted a pH of 8.04 for the commercial seawater, which is in excellent agreement with the measured pH 8.05 value.

Citation

Miranda, M., Carvetta, C., Sisodia, N., Shirley, L., Day, C., McGuinness, K., Wadhawan, J. D., & Lawrence, N. S. (in press). Nafion® Coated Electropolymerised Flavanone-based pH Sensor. Electroanalysis, https://doi.org/10.1002/elan.202100652

• Journal Article Type: Article
• Acceptance Date: Jan 8, 2022
• Online Publication Date: Jan 9, 2022
• Deposit Date: Jan 14, 2022
• Publicly Available Date: Jan 10, 2023
• Journal: Electroanalysis
• Print ISSN: 1040-0397
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1002/elan.202100652
• Keywords: pH; Electropolymerisation; Flavanone Square Wave; Voltammetry; Nafion
• Public URL: https://hull-repository.worktribe.com/output/3911193