Modification of the Gold Electrode with Nafion/WO3 for Oxalate Ions Detection
| Authors | M. Rahmah, F. Kurniawan |
| Affiliations |
Chemistry Department, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, 60111 Surabaya, Indonesia |
| Е-mail | fredy@its.ac.id |
| Issue | Volume 16, Year 2024, Number 4 |
| Dates | Received 14 April 2024; revised manuscript received 20 August 2024; published online 27 August 2024 |
| Citation | M. Rahmah, F. Kurniawan, J. Nano- Electron. Phys. 16 No 4, 04011 (2024) |
| DOI | https://doi.org/10.21272/jnep.16(4).04011 |
| PACS Number(s) | 82.47.Rs |
| Keywords | Nafion, Modified electrode, Electrochemical sensor, Oxalate. |
| Annotation |
Gold electrode modification with nafion and WO3 has been done for oxalate ion detection. The voltammogram of oxalate ion on the surface gold with and without modification showed a significant difference. This means that the modified gold electrode is sensitive to oxalate ions. The performance of the modified electrode in different pH (5, 7, and 12) in the KCl solution also has been studied using cyclic voltammetry. The range of the measurement is from – 1.0 to + 1.0 at a scan rate of 100 mV s – 1. The result showed that the optimum measurement pH is 12 with an anodic peak at 0.143 V and no reduction peak. The measurements of 0, 50, 100, 150, 200, and 250 mg L – 1 oxalic ion also have been conducted, showing a linear increase in current. The equation obtained is y 0.5426 x + 0.9127. In addition, the modified gold electrode showed good selectivity towards oxalate detection, as cyclic voltammetry measurements of some interference components did not produce redox peaks in the oxalate oxidation potential range. These findings indicate that gold electrodes modified with Nafion/WO3 significantly affect the potential development of electrochemical oxalate sensors. |
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