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https://hdl.handle.net/10119/20059
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| Title: | Optimization of the Synergistic Effects in Polycrystalline Pt-Au Electrodes in developing an Effective Arsenic Sensor via Oxidation Reactions |
| Authors: | Hossain, Mohammad Imran
Saha, Surove Rani
Aoki, Kentaro
Alam, Md. Mahfujul
Singha, Nayan Ranjan
Rahaman, Mostafizur
Aldalbahi, Ali
Nagao, Yuki
Hasnat, Mohammad A. |
| Keywords: | Arsenic oxidation
Pt-Au electrode
Au deposition
Kinetics
Sensing |
| Issue Date: | 2024-10-08 |
| Publisher: | Royal Society of Chemistry |
| Magazine name: | New Journal of Chemistry |
| Volume: | 48 |
| Number: | 42 |
| Start page: | 18301 |
| End page: | 18313 |
| DOI: | 10.1039/D4NJ03312D |
| Abstract: | A detailed kinetic study of the electrocatalytic oxidation of arsenite [As(III)] to arsenate [As(V)] has been performed in acidic medium by using gold (Au) immobilized platinum (Pt) electrodes. To prepare the Au modified Pt electrodes, a polycrystalline Pt electrode was cycled between 0 to −1 V vs. Ag/AgCl (sat. KCl) in 0.05 M HAuCl4 solution at a scan rate of 0.1 Vs−1. The Pt-Au electrode prepared by 1 deposition cycle of Au demonstrated an As(III) oxidation peak potential at 0.79 V with a peak current value of 62.14 μA. As the deposition cycle was increased, the required potential for oxidation reaction decreased shifting towards a more negative value. The least potential required was observed for the electrode prepared with 8 deposition cycles of Au. The result was also verified with various surface characterization techniques including SEM, EDX, XRD, and XPS. Kinetic investigation revealed that the As(III) ions approach the 8 cycles of Au deposited Pt electrode through a diffusion-limited process, subsequently following a first-order reaction with stepwise transfer of electrons. The electrode exhibited a sensitivity of 23.13 μA mM−1 for As(III) oxidation. The LOD for As(III) by the proposed electrode was found to be 65.39 μM which also boasts its excellent performance. |
| Rights: | Copyright (C) 2024 Royal Society of Chemistry. Mohammad Imran Hossain, Surove Rani Saha, Kentaro Aoki, Md. Mahfujul Alam, Nayan Ranjan Singha, Mostafizur Rahaman, Ali Aldalbahi, Yuki Nagao, Mohammad A. Hasnat, New Journal of Chemistry 48 (42), 18301-18313. https://doi.org/10.1039/D4NJ03312D - Reproduced with permission from the Centre National de la Recherche Scientifique (CNRS) and the Royal Society of Chemistry. |
| URI: | https://hdl.handle.net/10119/20059 |
| Material Type: | author |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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