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Please use this identifier to cite or link to this item:
https://hdl.handle.net/10119/20020
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| Title: | Influence of Different Dissolved Gases on Electrocatalytic Nitrate Sensing Performance at Cu-modified Au Electrode |
| Authors: | Islam, Motasim B.
Hossain, Mohammad Imran
Hosen, Nazmul
Rahaman, Mostafizur
Singha, Nayan Ranjan
Aoki, Kentaro
Nagao, Yuki
Hasnat, Mohammad A. |
| Keywords: | Nitrate reduction reaction
Neutral medium
Dissolved gas
Nitrate sensor
Kinetics |
| Issue Date: | 2024-09-23 |
| Publisher: | Wiley-VCH GmbH |
| Magazine name: | ChemistrySelect |
| Volume: | 9 |
| Number: | 36 |
| Start page: | e202402986 |
| DOI: | 10.1002/slct.202402986 |
| Abstract: | The present study investigates the electrocatalytic nitrate reduction reaction (NRR) on a Cu/Au electrode surface in a neutral pH potassium chloride (KCl) environment saturated with nitrogen, oxygen, and carbon dioxide, three of the most abundant atmospheric gases. The electrode was characterized using OCP, EIS, SEM, EDX, XPS, and XRD to assess its electrochemical properties, catalytic feasibility, and surface morphology. Results indicated that nitrate ions undergo a consecutive reduction process (NO3− → NO2− →NH3) on the Cu/Au electrode. O2 saturated environment impeded the NRR process through O2 adsorption on the electrode surface prior to the NO3− → NO2− conversion. In contrast, CO2 saturated condition enhanced the reaction by neutralizing the NRR byproduct OH− ions, thus accelerating the overall NRR kinetics. Under CO2 environment the NRR process was found more facile compared to that of other two gases. NRR took place at a peak potential of −0.71 V and −1.06 V for the first and second reduction wave, respectively. Kinetic analysis showed that the reduction reactions in presence of CO2 followed first-order, diffusion-limited kinetics. The Cu/Au electrode exhibited high sensitivity (3.49×10−1 μA μM−1) with an LOD of 0.46 μM for nitrate detection, and finally demonstrated excellent performance in real sample analysis. |
| Rights: | This is the peer reviewed version of the following article: M. B. Islam, M. I. Hossain, N. Hosen, M. Rahaman, N. R. Singha, K. Aoki, Y. Nagao, M. A. Hasnat, ChemistrySelect 2024, 9, e202402986, which has been published in final form at https://doi.org/10.1002/slct.202402986. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
| URI: | https://hdl.handle.net/10119/20020 |
| Material Type: | author |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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| M-NAGAO-Y-1010-2.pdf | | 1420Kb | Adobe PDF | View/Open |
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