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Título: | Metal-doped imine frameworks for the oxygen reduction reaction in acidic media |
Autor: | Tolosana-Moranchel, Álvaro; López García, Álvaro CSIC ORCID ; García-Corral, Álvaro; Marco, J.F. CSIC ORCID CVN ; Pascual, L.; Liuzzi, Dalia; Salam, Mohamed A.; Ferrer, Pilar CSIC ORCID; Torrero, Jorge; Grinter, David C.; Held, Georg; García Sánchez, Daniel; Friedrich, K. Andreas; Retuerto, María CSIC ORCID; Rojas, Sergio | Fecha de publicación: | 15-sep-2023 | Editor: | Elsevier | Citación: | Journal of Power Sources 578: 233223 (2023) | Resumen: | The overall performance of proton exchange membrane fuel cells is limited by the sluggish kinetics of the oxygen-reduction reaction (ORR). Among the most active PGM-free ORR electrocatalysts are metal-nitrogen-carbon (M-N-C), such as Fe–N–C. The Fe–N4 ensembles in these PGM-free catalysts, present in different configurations, are proposed to be the active sites for the ORR in acid. In this work, we have synthesized a Fe/N/C catalyst via thermal treatment of a polymeric CxNy precursor obtained by the wet-polymerization of melamine (a nitrogen rich molecule) and terephthaldehyde. The materials obtained (Im-FeNC-1HT and Im-FeNC-2HT) display high ORR activity in acid electrolyte compared to other Fe–N–C catalysts prepared with precursors different than 2-methylimidazole or ZIF-8. Characterization data indicate the formation of high- and low-spin Fe-Nx ensembles, with a site density of 4.4·1019 sitesFe·g−1 estimated by electrochemical stripping of NO. The ORR activity was evaluated in a RRDE configuration in 0.1 M HClO4 and in MEA configuration in a single cell. | Descripción: | 11 pags., 7 figs., 2 tabs. | Versión del editor: | https://doi.org/10.1016/j.jpowsour.2023.233223 | URI: | http://hdl.handle.net/10261/335665 | DOI: | 10.1016/j.jpowsour.2023.233223 | ISSN: | 0378-7753 |
Aparece en las colecciones: | (IQF) Artículos (ICP) Artículos |
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JPS_ATolosana_et_al_2023.pdf | Artículo principal | 3,97 MB | Adobe PDF | Visualizar/Abrir |
1-s2.0-S0378775323005992-mmc1.docx | Supplementary information | 1,02 MB | Microsoft Word XML | Visualizar/Abrir |
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