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Although niobium oxides have shown promising results as battery anodes, the perovskite structures are rarely utilized for electrochemical energy storage applications due to their low electrical conductivity. Therefore, this study reports the synthesis of a novel mixed perovskite, Nax(Nb0.5W0.5)O3, through a green, collagen-assisted route. FTIR analysis indicated that the synthesis is facilitated by the possible complexation of the niobium precursor within the protein structures. Furthermore, Rietveld refinement confirmed the formation of a mixed compound consisting of 97% Nax(Nb0.5W0.5)O3 and 3% (Na0.75Nb0.25)WO4. FEG-SEM characterization revealed nanoparticles with an average minimum Feret diameter of 95.03 nm. Postactivation XPS analysis of the electrodes revealed that the charge storage occurs via intercalation-type pseudocapacitance. Another significant aspect is the stabilization of tungsten in the +6 oxidation state, leading to an enhanced theoretical maximum capacity of 270.9 mAh g\u20131. Finally, galvanostatic charge and discharge confirmed the energy storage process, demonstrating a capacity of 243 mAh g\u20131 at 200 mA g\u20131 in an aqueous sodium-ion electrolyte. This enhanced performance is likely attributed to improved material conductivity resulting from the reduction of the bandgap from 3.4 eV (NaNbO3) to 3.04 eV and an Rct of 0.48 \u03a9 by electrochemical impedance spectroscopy.<\/jats:p>","DOI":"10.1021\/acsomega.6c02992","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T13:02:12Z","timestamp":1789995732000},"page":"58752-58764","source":"Crossref","is-referenced-by-count":0,"title":["A Novel Mixed Perovskite-like\nAlkali Niobium Tungsten\nOxide (Na\n                    <i>x<\/i>\n                    (Nb0.5W0.5)O3) Synthesized by a Sustainable Collagen Dispersion\nProcess"],"prefix":"10.1021","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-9156-3591","authenticated-orcid":true,"given":"Gabriel Luiz","family":"Rasch","sequence":"first","affiliation":[{"name":"Federal University of Rio Grande do Sul (UFRGS) , , , ,","place":["Porto Alegre, Rio Grande do Sul, Brazil, 90040-060"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adilar","family":"Gonc\u0327alves dos Santos Ju\u0301nior","sequence":"additional","affiliation":[{"name":"Federal University of Rio Grande do Sul (UFRGS) , , , ,","place":["Porto Alegre, Rio Grande do Sul, Brazil, 90040-060"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1650-7677","authenticated-orcid":true,"given":"Ricardo","family":"Faccio","sequence":"additional","affiliation":[{"name":"Universidad de la Repu\u0301blica , , Av. 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Flores 2124, C.P. , ,","place":["Montevideo, Uruguay, 11800"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6817-6860","authenticated-orcid":true,"given":"Fabiano","family":"Bernardi","sequence":"additional","affiliation":[{"name":"Federal University of Rio Grande do Sul (UFRGS) , , , ,","place":["Porto Alegre, Rio Grande do Sul, Brazil, 90040-060"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1343-2772","authenticated-orcid":true,"given":"Andre\u0301s","family":"Cun\u0303a Sua\u0301rez","sequence":"additional","affiliation":[{"name":"Universidad de la Repu\u0301blica , , ,","place":["Montevideo, Uruguay, 11800"]},{"name":"Universidad de la Repu\u0301blica , , , ,","place":["Pando, Canelones, Uruguay, 91000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio Marcos Helgueira de","family":"Andrade","sequence":"additional","affiliation":[{"name":"Federal University of Rio Grande do Sul (UFRGS) , , , ,","place":["Porto Alegre, Rio Grande do Sul, Brazil, 90040-060"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leonardo Moreira","family":"dos Santos","sequence":"additional","affiliation":[{"name":"Pontifical Catholic University of Rio Grande do Sul , , , ,","place":["Porto Alegre, Rio Grande do Sul, Brazil, 90619-900"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8625-5607","authenticated-orcid":true,"given":"Roberto","family":"Hu\u0308bler","sequence":"additional","affiliation":[{"name":"Pontifical Catholic University of Rio Grande do Sul , , , ,","place":["Porto Alegre, Rio Grande do Sul, Brazil, 90619-900"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wladimir","family":"Hernandez Flores","sequence":"additional","affiliation":[{"name":"Federal University of Pampa , Bage\u0301 Campus, Avenue Maria Anunciac\u0327a\u0303o Gomes de Godoy 1650 , , ,","place":["Bage\u0301, RS, Brazil, 96400-100"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ce\u0301lia","family":"de Fraga Malfatti","sequence":"additional","affiliation":[{"name":"Federal University of Rio Grande do Sul (UFRGS) , , , ,","place":["Porto Alegre, Rio Grande do Sul, Brazil, 90040-060"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,21]]},"reference":[{"key":"2026100610501594400_cit1","doi-asserted-by":"publisher","first-page":"88","DOI":"10.1016\/j.jpowsour.2018.06.007","article-title":"Constructing\nT-Nb2O5@Carbon Hollow Core-Shell Nanostructures for High-Rate Hybrid\nSupercapacitor","volume":"396","author":"Zhang","year":"2018","journal-title":"J. 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