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In this work, chitins from squid and prawn marine wastes were used as carbon precursors for further application as electrodes for energy storage devices. Chitins were obtained through a deproteinization method based on enzymatic hydrolysis as an alternative to chemical hydrolysis as commonly presented in the literature. The obtained porous carbons were characterized using a BET surface area analyzer to determine the specific surface area and pore size, as well as scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), Raman spectroscopy, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), to characterize their morphology, composition, and structure. The electrochemical characterization was performed using a glassy carbon (GC) electrode modified with marine waste-based porous carbons as the working electrode through cyclic voltammetry and galvanostatic charge\/discharge using ethaline, a choline chloride-based deep eutectic solvent (DES), as an eco-friendly and sustainable electrolyte. Squid and prawn chitin-based carbons presented a surface area of 149.3 m2 g\u22121 and 85.0 m2 g\u22121, pore volume of 0.053 cm3 g\u22121 and 0.029 cm3 g\u22121, and an associated specific capacitance of 20 and 15 F g\u22121 at 1 A g\u22121, respectively. Preliminary studies were performed to understand the effect of -OH groups on the chitin-based carbon surface with DES as an electrolyte, as well as the effect of aqueous electrolytes (1 mol L\u22121 sulphuric acid (H2SO4) and 1 mol L\u22121 potassium hydroxide (KOH)) on the capacitance and retention of the half-cell set up. It is provided, for the first time, the use of chitin-based carbon materials obtained through a one-step carbonization process combined with an eco-friendly DES electrolyte for potential application in energy storage devices.<\/jats:p>","DOI":"10.3390\/ma16062332","type":"journal-article","created":{"date-parts":[[2023,3,15]],"date-time":"2023-03-15T04:39:45Z","timestamp":1678855185000},"page":"2332","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Chitins from Seafood Waste as Sustainable Porous Carbon Precursors for the Development of Eco-Friendly Supercapacitors"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3291-7713","authenticated-orcid":false,"given":"Ana T. S. C.","family":"Brand\u00e3o","sequence":"first","affiliation":[{"name":"Instituto de Ci\u00eancias Moleculares IMS-CIQUP, Departamento de Qu\u00edmica e Bioqu\u00edmica, Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3259-5729","authenticated-orcid":false,"given":"Renata","family":"Costa","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancias Moleculares IMS-CIQUP, Departamento de Qu\u00edmica e Bioqu\u00edmica, Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8815-4650","authenticated-orcid":false,"given":"Sabrina","family":"State","sequence":"additional","affiliation":[{"name":"Center for Surface Science and Nanotechnology, University Polytechnica of Bucharest, Splaiul Independentei, 313, 060042 Bucharest, Romania"}]},{"given":"Pavel","family":"Potorac","sequence":"additional","affiliation":[{"name":"Center for Surface Science and Nanotechnology, University Polytechnica of Bucharest, Splaiul Independentei, 313, 060042 Bucharest, Romania"}]},{"given":"Catarina","family":"Dias","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancias Moleculares IMS-CIQUP, Departamento de Qu\u00edmica e Bioqu\u00edmica, Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1122-4726","authenticated-orcid":false,"given":"Jos\u00e9 A.","family":"V\u00e1zquez","sequence":"additional","affiliation":[{"name":"Grupo de Reciclado y Valorizaci\u00f3n de Residuos (REVAL), Instituto de Investigaciones Marinas (IIM-CSIC), 36208 Vigo, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7336-4049","authenticated-orcid":false,"given":"Jesus","family":"Valcarcel","sequence":"additional","affiliation":[{"name":"Grupo de Reciclado y Valorizaci\u00f3n de Residuos (REVAL), Instituto de Investigaciones Marinas (IIM-CSIC), 36208 Vigo, Spain"}]},{"given":"A. Fernando","family":"Silva","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancias Moleculares IMS-CIQUP, Departamento de Qu\u00edmica e Bioqu\u00edmica, Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8451-8231","authenticated-orcid":false,"given":"Marius","family":"Enachescu","sequence":"additional","affiliation":[{"name":"Center for Surface Science and Nanotechnology, University Polytechnica of Bucharest, Splaiul Independentei, 313, 060042 Bucharest, Romania"},{"name":"Academy of Romanian Scientists, Splaiul Independentei 54, 050094 Bucharest, Romania"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8392-9581","authenticated-orcid":false,"given":"Carlos M.","family":"Pereira","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancias Moleculares IMS-CIQUP, Departamento de Qu\u00edmica e Bioqu\u00edmica, Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,14]]},"reference":[{"key":"ref_1","first-page":"100180","article-title":"Technologies and perspectives for achieving carbon neutrality","volume":"2","author":"Wang","year":"2021","journal-title":"Innovation"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Stevic, D.Z.M. 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