Polymer-derived Co/Ni–SiOC(N) ceramic electrocatalysts for oxygen reduction reaction in fuel cells
|T. Silva, M. Mooste, E. Kibena-Poldsepp, L. Matisen, M. Merisalu, M. Kook, V. Sammelselg, K. Tammeveski, M. Wilhelm, K. Rezwan_Polymer-derived Co Ni–SiOC(N) ceramic elctrocata_Deckblatt_pdfa1.pdf||2.42 MB||Adobe PDF||View/Open|
|Authors:||Canuto de Almeida e Silva, Thamires
Cobalt/nickel-containing SiOC-based porous ceramic electrocatalysts were prepared by pyrolysis of poly(methyl silsesquioxane) and poly(methyl phenyl silsesquioxane) as preceramic precursors combined with graphite and Co/Ni metal salts at 1000 °C in an atmosphere of nitrogen. Subsequently, the Co/Ni–SiOC materials were N-doped using dicyandiamide (DCDA) as a nitrogen source and pyrolysed at 800 °C in an inert atmosphere. The structural properties and composition of the catalysts were characterised by scanning electron microscopy (SEM), X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and N2 adsorption analysis. The evaluation of the polymer-derived SiOC(N) ceramic electrocatalysts as a new class of catalysts for the oxygen reaction reduction (ORR) was carried out by the rotating disk electrode (RDE) method under acidic, neutral and alkaline conditions. The O2 reduction studies revealed that the N-doped materials exhibited enhanced ORR performance, confirming the positive influence of the nitrogen functionalities introduced into the catalysts. The Co-containing N-doped SiOC catalyst exhibited significantly higher ORR activity compared with the studied materials along with the highest electron transfer number in all the studied solutions. Long-term ORR performance testing indicated that the durability of this catalyst was superior as compared to that of commercial Pt/C. These observations suggest that the Co-containing N-doped SiOC catalyst is a promising cathode material for fuel cells (FCs) and microbial FC devices.
|Keywords:||Mimenima||Issue Date:||15-Jan-2019||Publisher:||Royal Society of Chemistry||Project:||MIMENIMA GRK 1860||Funders:||Deutsche Forschungsgemeinschaft||Grant number:||601090||Journal/Edited collection:||Catalysis Science & Technology||Start page:||854||End page:||866||Band:||9||Type:||Artikel/Aufsatz||ISSN:||2044-4753||Secondary publication:||yes||Document version:||Postprint||DOI:||10.26092/elib/2490||URN:||urn:nbn:de:gbv:46-elib71708||Institution:||Universität Bremen||Faculty:||Zentrale Wissenschaftliche Einrichtungen und Kooperationen||Institute:||MAPEX Center for Materials and Processes|
|Appears in Collections:||Forschungsdokumente|
checked on Dec 10, 2023
checked on Dec 10, 2023
Items in Media are protected by copyright, with all rights reserved, unless otherwise indicated.