2026-08-26T23:45:05Zhttps://gredos.usal.es/oai/request

oai:gredos.usal.es:10366/1685962026-01-10T01:01:56Zcom_10366_4164com_10366_4055com_10366_3946com_10366_3823col_10366_4165

Jiménez Morales, Ignacio Haidar, Fatima Cavaliere, Sara Jones, Deborah Rozière, Jacques 2026-01-09T12:25:39Z 2026-01-09T12:25:39Z 2020 I. Jiménez-Morales, F. Haidar, S. Cavaliere,D. Jones, J. Rozière, ACS Catal. 2020, 10, 18, 10399–10411 2155-5435 http://hdl.handle.net/10366/168596 10.1021/acscatal.0c02220 2155-5435 [EN]Electrocatalyst supports stable to high potential are required for the proton exchange membrane fuel cell cathode. Electrocatalyst supports based on tantalum-doped tin oxide (Ta/SnO2) were prepared by electrospinning. The dopant amount was varied between 0 (undoped SnO2) and 7.5 at. %, and the resulting materials were characterized for their morphology, composition, structure, porosity, and electrical properties. Platinum nanoparticles prepared by a microwave-assisted polyol method were deposited with different loadings on 1 at. % Ta-doped SnO2 (1Ta/SnO2), selected for its highest electrical conductivity of 0.09 S cm–1. Their electrocatalytic properties toward the oxygen reduction reaction (ORR) were compared with those of the same particles deposited on carbon black and those of a commercial carbon-supported Pt catalyst. Pt/1Ta/SnO2 showed higher ORR activity and stability at high potential than Pt/C. In particular, the electrocatalyst with the lowest Pt loading (7 wt %) presented high mass activity and stability which, from XPS analysis, is suggested to result from very strong metal–support interaction. These results indicate that amongst tin oxides doped with pentavalent metals such as niobium (Nb/SnO2), antimony (Sb/SnO2), and tantalum, Ta/SnO2 has the advantage of both higher conductivity than Nb/SnO2 and greater stability in the fuel cell voltage range than Sb/SnO2. European Union’s Seventh Framework Programme French National Research Agency eng American Chemical Society Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Electrocatalysis Alternative supports Tin oxide Strong metal−support interaction Corrosion-resistant supports 2210.05 Electroquímica 2210.28-1 Preparación y Caracterización de Materiales Inorgánicos 2210.28 Química del Estado Sólido 2303 Química Inorgánica 2391 Química Ambiental Strong Interaction between Platinum Nanoparticles and Tantalum-Doped Tin Oxide Nanofibers and Its Activation and Stabilization Effects for Oxygen Reduction Reaction info:eu-repo/semantics/article info:eu-repo/semantics/draft https://doi.org/10.1021/acscatal.0c02220 (FP/2007−2013)/ERC Grant Agreement SPINAM no. 306682 ANR-17-CE05-0033 project MOISE ACS Catalysis 10 18 10399 10411