Low-frequency capacitance and mass-change of un-conditioned Nafion-coated electrodes – towards calibration-free aAg(I) ion sensing in pure water
Here, we propose a method for chemical sensing of Ag+ ions in pure water by utilizing single-use and un-conditioned Nafion-coated Au electrodes together with capacitive and mass transduction principles. Ag+ ions were accumulated and simultaneously Ag was deposited in the Nafion membrane at an applie...
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| Format: | Article |
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Elsevier
2025-06-01
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| Series: | Electrochemistry Communications |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1388248125000505 |
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| author | Tingting Han Sini Chen Tao Song Xuliang Lin Dongxue Han Johan Bobacka Li Niu |
| author_facet | Tingting Han Sini Chen Tao Song Xuliang Lin Dongxue Han Johan Bobacka Li Niu |
| author_sort | Tingting Han |
| collection | DOAJ |
| description | Here, we propose a method for chemical sensing of Ag+ ions in pure water by utilizing single-use and un-conditioned Nafion-coated Au electrodes together with capacitive and mass transduction principles. Ag+ ions were accumulated and simultaneously Ag was deposited in the Nafion membrane at an applied potential of −0.6 V vs. Ag/AgCl, followed by electrochemical impedance spectroscopy (EIS) to obtain the low-frequency capacitance. After Ag deposition, the resulting change in the low-frequency capacitance at 10 mHz of the Nafion-coated Au was determined with respect to the activity of Ag+ ion (aAg+) in solution in the range of logaAg+ = −11 to −2. The precision of the low-frequency capacitance was improved by utilizing spin-coated thin-layer Nafion membrane with applied single frequency at 1 Hz. Under identical experimental conditions, the capacitive response of the Nafion/Au electrode was larger than that of a Nafion-coated glassy carbon (Nafion/GC) electrode, indicating better electrocatalytic activity of Au than GC towards Ag+. Based on quartz crystal microbalance (QCM) measurements, the mass change due to Ag deposition at Nafion/Au was linearly proportional to logaAg+ in the range of −5 to −2. Both EIS and QCM methods show a response that correlates with the concentration or activity of Ag+ ions in pure water, which might give a possibility for calibration-free determination of Ag+ without any electrode conditioning needed. |
| format | Article |
| id | doaj-art-15f9b9cb1fc14c80b1d30c4f77c08a21 |
| institution | OA Journals |
| issn | 1388-2481 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
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| series | Electrochemistry Communications |
| spelling | doaj-art-15f9b9cb1fc14c80b1d30c4f77c08a212025-08-20T01:49:46ZengElsevierElectrochemistry Communications1388-24812025-06-0117510791110.1016/j.elecom.2025.107911Low-frequency capacitance and mass-change of un-conditioned Nafion-coated electrodes – towards calibration-free aAg(I) ion sensing in pure waterTingting Han0Sini Chen1Tao Song2Xuliang Lin3Dongxue Han4Johan Bobacka5Li Niu6Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, c/o School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China; Corresponding author.Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, c/o School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR ChinaState Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR ChinaGuangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, c/o School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR ChinaÅbo Akademi University, Faculty of Science and Engineering, Laboratory of Molecular Science and Engineering, Henriksgatan 2, FI-20500 Turku/Åbo, FinlandGuangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, c/o School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China; School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, PR ChinaHere, we propose a method for chemical sensing of Ag+ ions in pure water by utilizing single-use and un-conditioned Nafion-coated Au electrodes together with capacitive and mass transduction principles. Ag+ ions were accumulated and simultaneously Ag was deposited in the Nafion membrane at an applied potential of −0.6 V vs. Ag/AgCl, followed by electrochemical impedance spectroscopy (EIS) to obtain the low-frequency capacitance. After Ag deposition, the resulting change in the low-frequency capacitance at 10 mHz of the Nafion-coated Au was determined with respect to the activity of Ag+ ion (aAg+) in solution in the range of logaAg+ = −11 to −2. The precision of the low-frequency capacitance was improved by utilizing spin-coated thin-layer Nafion membrane with applied single frequency at 1 Hz. Under identical experimental conditions, the capacitive response of the Nafion/Au electrode was larger than that of a Nafion-coated glassy carbon (Nafion/GC) electrode, indicating better electrocatalytic activity of Au than GC towards Ag+. Based on quartz crystal microbalance (QCM) measurements, the mass change due to Ag deposition at Nafion/Au was linearly proportional to logaAg+ in the range of −5 to −2. Both EIS and QCM methods show a response that correlates with the concentration or activity of Ag+ ions in pure water, which might give a possibility for calibration-free determination of Ag+ without any electrode conditioning needed.http://www.sciencedirect.com/science/article/pii/S1388248125000505Low-frequency capacitanceSingle-frequency capacitanceMass changeElectrochemical impedance spectroscopyQuartz crystal microbalanceSilver ion |
| spellingShingle | Tingting Han Sini Chen Tao Song Xuliang Lin Dongxue Han Johan Bobacka Li Niu Low-frequency capacitance and mass-change of un-conditioned Nafion-coated electrodes – towards calibration-free aAg(I) ion sensing in pure water Electrochemistry Communications Low-frequency capacitance Single-frequency capacitance Mass change Electrochemical impedance spectroscopy Quartz crystal microbalance Silver ion |
| title | Low-frequency capacitance and mass-change of un-conditioned Nafion-coated electrodes – towards calibration-free aAg(I) ion sensing in pure water |
| title_full | Low-frequency capacitance and mass-change of un-conditioned Nafion-coated electrodes – towards calibration-free aAg(I) ion sensing in pure water |
| title_fullStr | Low-frequency capacitance and mass-change of un-conditioned Nafion-coated electrodes – towards calibration-free aAg(I) ion sensing in pure water |
| title_full_unstemmed | Low-frequency capacitance and mass-change of un-conditioned Nafion-coated electrodes – towards calibration-free aAg(I) ion sensing in pure water |
| title_short | Low-frequency capacitance and mass-change of un-conditioned Nafion-coated electrodes – towards calibration-free aAg(I) ion sensing in pure water |
| title_sort | low frequency capacitance and mass change of un conditioned nafion coated electrodes towards calibration free aag i ion sensing in pure water |
| topic | Low-frequency capacitance Single-frequency capacitance Mass change Electrochemical impedance spectroscopy Quartz crystal microbalance Silver ion |
| url | http://www.sciencedirect.com/science/article/pii/S1388248125000505 |
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