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Nevertheless, to obtain high performance, scalable and effective electrocatalysts must be added. The use of readily available carbon\u2010rich biowaste has become a widely advanced approach in scaling up new energy storage technologies. Furthermore, the tunable and porous characteristics inherent to bio\u2010waste precursors can enhance capacitive behavior, enabling hybrid performance. In this work, a peanut\u2010shell bio\u2010waste activated carbon\u2014originally designed for supercapacitor electrodes, leveraging its high surface area and capacitive potential\u2014is synthesized through an easy, affordable, and eco\u2010friendly process, and applied as an electrocatalyst in a SWB cathode. Notably, the bio\u2010waste coating on the immersed electrode exhibited remarkable enhancements over a thermally treated commercial carbon felt electrode. These improvements included a capacitance increase of nearly 166% and reduced voltage gaps (averaging a 59% decrease) in a full\u2010cell configuration. This enhanced electrochemical performance results from a synergy between capacitive effects and improved oxygen reaction efficiency, supporting sustainable supercapacitor\u2010like capacitive electrodes in SWB technology.<\/jats:p>","DOI":"10.1002\/ente.202501038","type":"journal-article","created":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T18:09:51Z","timestamp":1758132591000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High\u2010Capacity Hybrid Electrode for Seawater Batteries with Bio\u2010Waste Electrocatalyst"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4384-8533","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Ferreira","sequence":"first","affiliation":[{"name":"Faculty of Engineering, Department of Engineering Physics University of Porto  Porto 4200\u2010465 Portugal"},{"name":"Faculty of Science, Department of Physics and Astronomy University 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