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Herein, conventional mineral acids commonly used for the synthesis of protic salts were replaced by bio-derived phytic acid, which, combined with various amines and amino acids, yielded partially or fully bio-derived protic salts. The biomass-based salts showed higher char-forming ability than their mineral acid-based analogs (up to 55.9% at 800\u00b0), simultaneously providing carbon materials with significant porosity (up to 1177 m<jats:sup>2<\/jats:sup>g<jats:sup>\u22121<\/jats:sup>) and a considerable level of N,P,O-doping. Here, we present the first comprehensive study on the correlation between the structure of the bio-derived protic precursors and the properties of derived carbon materials to guide future designs of biomass-derived precursors for the one-step synthesis of sustainable carbon materials. Additionally, we demonstrate how to improve the textural properties of the protic-salt-derived carbons (which suffer from high brittleness) by simply upgrading them into highly flexible nanocomposites using high-quality single-walled carbon nanotubes. Consequently, self-standing electrodes for the oxygen reduction reaction were created.<\/jats:p>","DOI":"10.1038\/s41598-024-61553-x","type":"journal-article","created":{"date-parts":[[2024,5,15]],"date-time":"2024-05-15T08:04:28Z","timestamp":1715760268000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Bio-based protic salts as precursors for sustainable free-standing film electrodes"],"prefix":"10.1038","volume":"14","author":[{"given":"Alina","family":"Brz\u0119czek-Szafran","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magdalena","family":"Gw\u00f3\u017ad\u017a","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bart\u0142omiej","family":"Gaida","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maciej","family":"Krzywiecki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miros\u0142awa","family":"Pawlyta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Agata","family":"Blacha-Grzechnik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Kolanowska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Chrobok","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dawid","family":"Janas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,5,15]]},"reference":[{"key":"61553_CR1","doi-asserted-by":"publisher","DOI":"10.1002\/AENM.202100695","author":"L Lin","year":"2021","unstructured":"Lin, L., Miao, N., Wallace, G. 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