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| Title: | IrOx-Pt electrode for electro-oxidation of ethanol for alkaline type direct ethanol fuel cell: An excellent CO-tolerant catalyst |
| Authors: | Islam, Md. Fahamidul
Ahmed, Jahir
Faisal, M.
Algethami, Jari S
Aoki, Kentaro
Nagao, Yuki
Harraz, Farid A.
Hasnat, Mohammad A. |
| Keywords: | Iridium oxide
Pt electrode
CO tolerance
Ethanol oxidation reaction
Fuel cell |
| Issue Date: | 2023-10-11 |
| Publisher: | Royal Society of Chemistry |
| Magazine name: | New Journal of Chemistry |
| Volume: | 47 |
| Number: | 41 |
| Start page: | 18933 |
| End page: | 18944 |
| DOI: | 10.1039/D3NJ03306F |
| Abstract: | In this study, iridium oxide layer deposited on Pt surface (IrOx-Pt) was utilized to explore ethanol oxidation reaction (EtOR) in alkaline medium. To fabricate the catalyst, cleaned Pt surface was scanned from 0 V to +1 V vs. Ag/AgCl (sat. KCl) in Ir2O3·xH2O colloidal suspension for 10 incessant cycles. A cyclic voltammogram recorded in 0.1 M NaOH solution corroborated the presence of IrOx by showing the appearance of a distinct redox pair on the Pt surface, with Epa at −0.31 V and Epc at −0.27 V. Energy dispersive mapping verified the uniform deposition of IrOx on Pt, and X-ray photoelectron spectroscopy showed that IrOx contains both IrIII and IrIV species. The results of cyclic voltammetric analysis indicated that the activity of the pure Pt catalyst towards EtOR was approximately 1.3 times greater than that of IrOx-Pt. However, the CO-tolerant ability of the Pt catalyst was roughly 3.5 times lower than that of IrOx-Pt. The results of the stability test indicated that the current density associated with EtOR on the IrOx-Pt electrode experienced a decrease of approximately 18% with a standard deviation of 1.15% after undergoing 500 consecutive cycles. In contrast, the Pt electrode exhibited a decrease in activity of nearly 50% with a standard deviation of 1.53% under similar experimental conditions. The study on scan rate dependence revealed that the electrode reaction was a process limited by mass transfer. |
| Rights: | Copyright (C) 2023 Royal Society of Chemistry. Md. Fahamidul Islam, Jahir Ahmed, M. Faisal, Jari S Algethami, Kentaro Aoki, Yuki Nagao, Farid A. Harraz, Mohammad A. Hasnat, New Journal of Chemistry 47 (41), 18933-18944. https://doi.org/10.1039/D3NJ03306F - Reproduced with permission from the Centre National de la Recherche Scientifique (CNRS) and the Royal Society of Chemistry. |
| URI: | http://hdl.handle.net/10119/19342 |
| Material Type: | author |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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