Recently updated on July 2nd, 2024 at 02:28 pm<\/p>","protected":false},"excerpt":{"rendered":"
Our goal was to synthesize Na0.67MnO2 (NMO) samples, both undoped and doped with Cu or Fe, through sol-gel synthesis, with different cooling phases to room temperature, either naturally or via quenching. The formation of a polymorph mixture was observed, as well as differences in the external morphology of the powder grains. The use of spectroscopic techniques, M\u00f6ssbauer spectroscopy for Fe-doped samples, and electron paramagnetic resonance allowed us to obtain information on the oxidation states of transition metals and provide insights into magnetic ordering and the possible presence of magnetic impurities. This enabled us to understand their influence on the electrochemical performance of the materials.<\/p>\n","protected":false},"author":93,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[1303],"targets":[1314],"pubblicazioni_tipologie":[773],"class_list":["post-188811","pubblicazioni","type-pubblicazioni","status-publish","hentry","tag-energy-transition","targets-press-media-en","pubblicazioni_tipologie-isi-article-en"],"acf":{"dont_show_hompage":true,"projects":{"ID":188409,"post_author":"93","post_date":"2024-06-13 15:10:21","post_date_gmt":"2024-06-13 13:10:21","post_content":"","post_title":"Electrochemical and thermal storage technologies","post_excerpt":"The goal of this project is to develop electrochemical and thermal storage technologies with improved performance and greater environmental and economic sustainability by optimizing the use of resources, material formulations and synthesis methods, diagnostic and control processes, and prototype design.","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"electrochemical-and-thermal-storage-technologies","to_ping":"","pinged":"","post_modified":"2024-07-06 15:23:41","post_modified_gmt":"2024-07-06 13:23:41","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.rse-web.it\/progetti\/electrochemical-and-thermal-storage-technologies\/","menu_order":0,"post_type":"progetti","post_mime_type":"","comment_count":"0","filter":"raw"},"order_posts":"","dont_show_search":false,"related_posts":false,"show_on_slider":false,"single_post_data":{"titolo_spot":"","post_content":"
Na0.67MnO2 (NMO) stands out among the layered cathode materials used for sodium batteries due to its high capacity values, low cost, and environmental compatibility. Unfortunately, many issues arise during cycling, but customizing the nanostructure and doping can help mitigate them. Our goal was to synthesize undoped and Cu- or Fe-doped NMO samples via the sol-gel route, with different cooling phases to room temperature, either naturally or by temperature control. The formation of a polymorph mixture and differences in the external morphology of the powder grains were observed.<\/p>\n
Using spectroscopic techniques, M\u00f6ssbauer spectroscopy for Fe-doped samples, and electron paramagnetic resonance, we obtained information on the oxidation states of transition metals and provided insights into magnetic ordering and the possible presence of magnetic impurities. The results from cyclic voltammetry and galvanostatic cycling were interpreted based on the spectroscopic data: the introduction of substituents generally worsens capacity values due to the decrease in the amount of P2 and the introduction of structural distortions. The structural stability of the samples in air over time was also analyzed via X-ray diffraction, demonstrating the positive effect of Cu presence.<\/p>\n","scarica_file":false,"link_estreno":[{"link_text":"Download Publication","link":"https:\/\/www.mdpi.com\/2076-3417\/12\/18\/9123"}],"button":{"text":"","link":""},"referente_group":false,"data_emissione":"2022-09-11","autori":"M. Ambrosetti, D. Spada, M. Sturini, M. Bini, M.C. Mozzati (Universit\u00e0 di Pavia), A. Cini, M. Fittipaldi (Universit\u00e0 di Firenze), I. Quinzeni (RSE S.p.A.)","destinazione":"MDPI Applied Science, Vol. 12, N. 9123, September 11, 2022","rif_rse":"22009830"},"satellite_post_url":""},"yoast_head":"\n