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Among them, they have been considered part of the next generation of electrochemical energy storage materials due to their variable oxidation states, low environmental toxicity, and possible synthesis through simple green chemical processing. However, most traditional procedures lead to the formation of poorly controlled materials (in terms of size, shape, composition, and\/or crystalline structure). Thus, we report herein a cellulose nanofibers-mediated green procedure to prepare controlled highly porous nanocorals comprised of spinel Zn-ferrites. Then, they presented remarkable applications as electrodes in supercapacitors, which were thoroughly and critically discussed. The spinel Zn-ferrites nanocorals supercapacitor showed a much higher maximum specific capacitance (2031.81 F g\u22121 at a current density of 1 A g\u22121) than Fe2O3 and ZnO counterparts prepared by a similar approach (189.74 and 24.39 F g\u22121 at a current density of 1 A g\u22121). Its cyclic stability was also scrutinized via galvanostatic charging\/discharging and electrochemical impedance spectroscopy, indicating excellent long-term stability. In addition, we manufactured an asymmetric supercapacitor device, which offered a high energy density value of 18.1 Wh kg\u22121 at a power density of 2609.2 W kg\u22121 (at 1 A g\u22121 in 2.0 mol L\u22121 KOH electrolyte). Based on our findings, we believe that higher performances observed for spinel Zn-ferrites nanocorals could be explained by their unique crystal structure and electronic configuration based on crystal field stabilization energy, which provides an electrostatic repulsion between the d electrons and the p orbitals of the surrounding oxygen anions, creating a level of energy that determines their final supercapacitance then evidenced, which is a very interesting property that could be explored for the production of clean energy storage devices.<\/jats:p>","DOI":"10.3390\/ijms24119169","type":"journal-article","created":{"date-parts":[[2023,5,24]],"date-time":"2023-05-24T01:29:26Z","timestamp":1684891766000},"page":"9169","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["Sustainable Cellulose Nanofibers-Mediated Synthesis of Uniform Spinel Zn-Ferrites Nanocorals for High Performances in Supercapacitors"],"prefix":"10.3390","volume":"24","author":[{"given":"Lucas T.","family":"Teixeira","sequence":"first","affiliation":[{"name":"Departamento de Engenharia Qu\u00edmica e de Materiais\u2014DEQM, Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro, Rio de Janeiro 22451-040, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Scarllet L. S.","family":"de Lima","sequence":"additional","affiliation":[{"name":"Departamento de Engenharia Qu\u00edmica e de Materiais\u2014DEQM, Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro, Rio de Janeiro 22451-040, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taissa F.","family":"Rosado","sequence":"additional","affiliation":[{"name":"Departamento de Engenharia Qu\u00edmica e de Materiais\u2014DEQM, Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro, Rio de Janeiro 22451-040, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liying","family":"Liu","sequence":"additional","affiliation":[{"name":"Centro Brasileiro de Pesquisas F\u00edsicas, Rio de Janeiro 22290-180, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6891-0524","authenticated-orcid":false,"given":"Hector A.","family":"Vitorino","sequence":"additional","affiliation":[{"name":"Centro de Investigaci\u00f3n en Biodiversidad para la Salud, Universidad Privada Norbert Wiener, Lima 15046, Peru"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3156-8673","authenticated-orcid":false,"given":"Clenilton C.","family":"dos Santos","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica, Centro de Ci\u00eancias Exatas e Tecnologia, Universidade Federal do Maranh\u00e3o, S\u00e3o Lu\u00eds 65080-805, MA, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jhonatam P.","family":"Mendon\u00e7a","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica, Centro de Ci\u00eancias Exatas e Tecnologia, Universidade Federal do Maranh\u00e3o, S\u00e3o Lu\u00eds 65080-805, MA, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3290-9297","authenticated-orcid":false,"given":"Marco A. S.","family":"Garcia","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica, Centro de Ci\u00eancias Exatas e Tecnologia, Universidade Federal do Maranh\u00e3o, S\u00e3o Lu\u00eds 65080-805, MA, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5300-991X","authenticated-orcid":false,"given":"Rog\u00e9rio N. C.","family":"Siqueira","sequence":"additional","affiliation":[{"name":"Departamento de Engenharia Qu\u00edmica e de Materiais\u2014DEQM, Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro, Rio de Janeiro 22451-040, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0592-7983","authenticated-orcid":false,"given":"Anderson G. M.","family":"da Silva","sequence":"additional","affiliation":[{"name":"Departamento de Engenharia Qu\u00edmica e de Materiais\u2014DEQM, Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro, Rio de Janeiro 22451-040, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Holechek, J.L., Geli, H.M.E., Sawalhah, M.N., and Valdez, R. (2022). A Global assessment: Can renewable energy replace fossil fuels by 2050?. Sustainability, 14.","DOI":"10.3390\/su14084792"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"5318","DOI":"10.1039\/D1MA00538C","article-title":"Nanomaterials: Stimulants for biofuels and renewables, yield and energy optimization","volume":"2","author":"Kumar","year":"2021","journal-title":"Mater. 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