Matthews, Thabo ; Chabalala, Makhaokane Paulina ; Mbokazi, Siyabonga Patrick ; Maumau, Thandiwe ; Mugadza, Kudzai ; Gallenberger, Julia ; Hofmann, Jan P. ; Dolla, Tarekegn Heliso ; Maxakato, Nobanathi Wendy (2024)
Multi-dimensional PtRu/Co3O4-Activated carbon nano-electrocatalyst: metal-support interaction, and electronic contributions towards methanol electrooxidation in alkaline fuel cells.
In: Fuel, 359
doi: 10.1016/j.fuel.2023.130460
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In this work, we report PtRu alloy system supported on Co3O4-activated carbon (Co3O4-C) prepared by direct reduction of H2PtCl6 and RuCl3 solutions as a highly active and durable electrocatalyst for methanol oxidation reaction. The electrochemical activity of the electrocatalysts was evaluated using electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), cyclic voltammetry (CV), and chronoamperometry (CA). The formation of PtRu alloy on the Co3O4-C matrix, as well as their electronic interactions, is confirmed by employing X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The electrocatalysts showed distinct electrocatalytic activity in alkaline medium, depending on whether the catalysts contained PtRu alloy and whether they were supported on the hybrid Co3O4-C, proving their unique contributions to the electrocatalytic reaction. Benefiting from the strong metal-support interaction (SMSI) and electronic interaction between Pt and Ru, the PtRu/Co3O4-C displayed a highly efficient electrocatalytic performance with a mass activity of 6709 mAmgPt-1, a substantial improvement compared to the commercial Pt-based benchmark catalyst, which achieved only 212 mAmgPt-1. Furthermore, the PtRu/Co3O4-C showed excellent stability after 10 000 s, high durability after 500 cycles retaining 94% of current density, and higher tolerance for CO. This enhanced catalytic performance can be attributed to the small nanoparticle sizes, high dispersion, large ECSA of 102.1 m2/g, and the synergy resulting from electronic coupling interactions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Matthews, Thabo ; Chabalala, Makhaokane Paulina ; Mbokazi, Siyabonga Patrick ; Maumau, Thandiwe ; Mugadza, Kudzai ; Gallenberger, Julia ; Hofmann, Jan P. ; Dolla, Tarekegn Heliso ; Maxakato, Nobanathi Wendy |
| Art des Eintrags: | Bibliographie |
| Titel: | Multi-dimensional PtRu/Co3O4-Activated carbon nano-electrocatalyst: metal-support interaction, and electronic contributions towards methanol electrooxidation in alkaline fuel cells |
| Sprache: | Englisch |
| Publikationsjahr: | 2024 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Fuel |
| Jahrgang/Volume einer Zeitschrift: | 359 |
| DOI: | 10.1016/j.fuel.2023.130460 |
| URL / URN: | https://www.sciencedirect.com/science/article/pii/S001623612... |
| Kurzbeschreibung (Abstract): | In this work, we report PtRu alloy system supported on Co3O4-activated carbon (Co3O4-C) prepared by direct reduction of H2PtCl6 and RuCl3 solutions as a highly active and durable electrocatalyst for methanol oxidation reaction. The electrochemical activity of the electrocatalysts was evaluated using electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), cyclic voltammetry (CV), and chronoamperometry (CA). The formation of PtRu alloy on the Co3O4-C matrix, as well as their electronic interactions, is confirmed by employing X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The electrocatalysts showed distinct electrocatalytic activity in alkaline medium, depending on whether the catalysts contained PtRu alloy and whether they were supported on the hybrid Co3O4-C, proving their unique contributions to the electrocatalytic reaction. Benefiting from the strong metal-support interaction (SMSI) and electronic interaction between Pt and Ru, the PtRu/Co3O4-C displayed a highly efficient electrocatalytic performance with a mass activity of 6709 mAmgPt-1, a substantial improvement compared to the commercial Pt-based benchmark catalyst, which achieved only 212 mAmgPt-1. Furthermore, the PtRu/Co3O4-C showed excellent stability after 10 000 s, high durability after 500 cycles retaining 94% of current density, and higher tolerance for CO. This enhanced catalytic performance can be attributed to the small nanoparticle sizes, high dispersion, large ECSA of 102.1 m2/g, and the synergy resulting from electronic coupling interactions. |
| Freie Schlagworte: | PtRu alloy, metal-support interaction, electronic contributions, fuel cell, methanol oxidation |
| ID-Nummer: | Artikel-ID: 130460 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung |
| Hinterlegungsdatum: | 11 Dez 2024 06:40 |
| Letzte Änderung: | 11 Dez 2024 15:17 |
| PPN: | 524526648 |
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