A Comparative Study of the Oxygen Reduction Reaction on Pt and Ag in Alkaline Media
Abstract Investigating the ORR under practical conditions is vital for optimizing metal–air batteries and alkaline fuel cells. Herein, we characterized Pt and Ag gas diffusion electrodes (GDE) in a GDE half‐cell in high alkaline concentrations at elevated temperatures by polarization curves and elec...
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| Language: | English |
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Wiley-VCH
2025-02-01
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| Series: | ChemElectroChem |
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| Online Access: | https://doi.org/10.1002/celc.202400563 |
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| author | Alexander Rampf Michael Braig Stefano Passerini Roswitha Zeis |
| author_facet | Alexander Rampf Michael Braig Stefano Passerini Roswitha Zeis |
| author_sort | Alexander Rampf |
| collection | DOAJ |
| description | Abstract Investigating the ORR under practical conditions is vital for optimizing metal–air batteries and alkaline fuel cells. Herein, we characterized Pt and Ag gas diffusion electrodes (GDE) in a GDE half‐cell in high alkaline concentrations at elevated temperatures by polarization curves and electrochemical impedance spectroscopy (EIS) combined with the distribution of relaxation times (DRT) analysis. The Pt catalyst's polarization curve displays substantial losses below 0.82 V vs. RHE. The DRT analysis reveals significantly increased charge transfer resistance and a decelerated ORR at that potential. RRDE measurements attributed the polarization loss observed for Pt catalysts to increased peroxide formation in this potential region triggered by the desorption of oxygenated species. Therefore, the ORR activity of Ag exceeds some of the here‐used Pt catalysts at high current densities. This work combines the benefits of the RRDE and the GDE half‐cell to study catalysts and identify the reaction mechanisms under conditions relevant to practical fuel cells and batteries. Moreover, the DRT analysis is introduced as an analytical tool to determine the charge transfer resistance contribution and the corresponding frequency of the ORR. |
| format | Article |
| id | doaj-art-bd736a9263fc4dfd96e8600db3674bb2 |
| institution | Kabale University |
| issn | 2196-0216 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | ChemElectroChem |
| spelling | doaj-art-bd736a9263fc4dfd96e8600db3674bb22025-02-03T10:00:37ZengWiley-VCHChemElectroChem2196-02162025-02-01123n/an/a10.1002/celc.202400563A Comparative Study of the Oxygen Reduction Reaction on Pt and Ag in Alkaline MediaAlexander Rampf0Michael Braig1Stefano Passerini2Roswitha Zeis3Helmholtz Institute Ulm Karlsruhe Institute of Technology Helmholtzstraße 11 89081 Ulm GermanyHelmholtz Institute Ulm Karlsruhe Institute of Technology Helmholtzstraße 11 89081 Ulm GermanyHelmholtz Institute Ulm Karlsruhe Institute of Technology Helmholtzstraße 11 89081 Ulm GermanyHelmholtz Institute Ulm Karlsruhe Institute of Technology Helmholtzstraße 11 89081 Ulm GermanyAbstract Investigating the ORR under practical conditions is vital for optimizing metal–air batteries and alkaline fuel cells. Herein, we characterized Pt and Ag gas diffusion electrodes (GDE) in a GDE half‐cell in high alkaline concentrations at elevated temperatures by polarization curves and electrochemical impedance spectroscopy (EIS) combined with the distribution of relaxation times (DRT) analysis. The Pt catalyst's polarization curve displays substantial losses below 0.82 V vs. RHE. The DRT analysis reveals significantly increased charge transfer resistance and a decelerated ORR at that potential. RRDE measurements attributed the polarization loss observed for Pt catalysts to increased peroxide formation in this potential region triggered by the desorption of oxygenated species. Therefore, the ORR activity of Ag exceeds some of the here‐used Pt catalysts at high current densities. This work combines the benefits of the RRDE and the GDE half‐cell to study catalysts and identify the reaction mechanisms under conditions relevant to practical fuel cells and batteries. Moreover, the DRT analysis is introduced as an analytical tool to determine the charge transfer resistance contribution and the corresponding frequency of the ORR.https://doi.org/10.1002/celc.202400563Distribution of relaxation times (DRT)GDE half-cell measurementsOxygen reduction reaction (ORR)PeroxideRotating ring-disk electrode (RRDE) |
| spellingShingle | Alexander Rampf Michael Braig Stefano Passerini Roswitha Zeis A Comparative Study of the Oxygen Reduction Reaction on Pt and Ag in Alkaline Media ChemElectroChem Distribution of relaxation times (DRT) GDE half-cell measurements Oxygen reduction reaction (ORR) Peroxide Rotating ring-disk electrode (RRDE) |
| title | A Comparative Study of the Oxygen Reduction Reaction on Pt and Ag in Alkaline Media |
| title_full | A Comparative Study of the Oxygen Reduction Reaction on Pt and Ag in Alkaline Media |
| title_fullStr | A Comparative Study of the Oxygen Reduction Reaction on Pt and Ag in Alkaline Media |
| title_full_unstemmed | A Comparative Study of the Oxygen Reduction Reaction on Pt and Ag in Alkaline Media |
| title_short | A Comparative Study of the Oxygen Reduction Reaction on Pt and Ag in Alkaline Media |
| title_sort | comparative study of the oxygen reduction reaction on pt and ag in alkaline media |
| topic | Distribution of relaxation times (DRT) GDE half-cell measurements Oxygen reduction reaction (ORR) Peroxide Rotating ring-disk electrode (RRDE) |
| url | https://doi.org/10.1002/celc.202400563 |
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