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https://hdl.handle.net/10119/19976
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| Title: | Electrokinetics of nitrite to ammonia conversion in the neutral medium over a platinum surface |
| Authors: | Islam, Md. Fahamidul
Ifti, Hassan Shahriar
Rahman, Mostafizur
Aoki, Kentaro
Nagao, Yuki
Aldalbahi, Ali
Uddin, Jamal
Hasnat, Mohammad A. |
| Keywords: | Nitrite
nitric oxide
ammonia
platinum
kinetics
activation energy |
| Issue Date: | 2024-08-01 |
| Publisher: | Wiley-VCH GmbH |
| Magazine name: | Chemistry – An Asian Journal |
| Volume: | 19 |
| Number: | 20 |
| Start page: | e202400362 |
| DOI: | 10.1002/asia.202400362 |
| Abstract: | Polycrystalline Pt electrode was employed to selectively convert nitrite ions (NO2-) into useful nitrogenous compound through electrochemical reduction reaction in neutral medium. According to adsorptive stripping analysis, the reduction process produced nitric oxide (NO) on the surface of Pt electrode. The spectroscopic test and gas chromatographic studies discovered the presence of ammonia (NH3) in the electrolyzed solution, suggesting the transformation of adsorbed NO into NH3 during the reverse scan. Scan rate dependent investigation was performed to elucidate kinetic information relating to this reaction on Pt surface. From Ep vs scan rate (υ) and jp vs υ (logarithmic plot), it was found that the conversion of NO2- ion into NO is an irreversible reaction which relies on the diffusion of NO2- ions to electrode surface. The Tafel analysis unveiled that the first electron transfer sets the overall reaction rate, having formal reduction potential, E0’ = −0.46 V and standard heterogeneous rate constant, k0 = 1.07 × 10-2 cm s−1. Reductive transfer coefficient (α) is another kinetics parameter, which was found to be approximate 0.77 from the difference between Ep and Ep/2 of the voltammograms obtained over scan rate range 0.005 V s−1 to 0.250 V s−1, indicating a stepwise process. According to temperature-dependent voltammograms, the nitrite reduction reaction on Pt had a calculated activation energy of about 19.8 kJ mol−1 and a pre-exponential factor of about 8.39 ×103 mA cm−2. |
| Rights: | This is the peer reviewed version of the following article: M. F. Islam, M. H. Shahriar, M. Rahaman, K. Aoki, Y. Nagao, A. Aldalbahi, J. Uddin, M. A. Hasnat, Chem. Asian J. 2024, 19, e202400362, which has been published in final form at https://doi.org/10.1002/asia.202400362. 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/10119/19976 |
| Material Type: | author |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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