Harnessing Seaweed-Derived Multiporous Activated Carbon for High-Performance Energy Storage and Water Splitting Applications

Harnessing Seaweed-Derived Multiporous Activated Carbon for High-Performance Energy Storage and Water Splitting Applications | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 30 January 2026 V1 Latest version Share on Harnessing Seaweed-Derived Multiporous Activated Carbon for High-Performance Energy Storage and Water Splitting Applications Authors : Lan Nguyen , Roshan Bhattarai , Avik Denra , Kannan Krishnan , Mohan Kumara Panneer Selvam , Jonas Hereijgersb , and Young Sun Mok 0000-0002-6694-2135 [email protected] Authors Info & Affiliations https://doi.org/10.22541/au.176979986.67616240/v1 118 views 56 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract The development of sustainable, high-performance materials for integrated energy storage and conversion is essential to address rising energy demand and safeguard the environment. This study demonstrates the strategic use of seaweed-derived activated carbon (SWAC), leveraging its intrinsic nitrogen-rich composition to produce a heteroatom-doped multiporous structure suitable for both electrochemical energy storage and water electrolysis applications. Using a straightforward activation and functionalization process, we synthesized nitrogen-enriched SWAC exhibiting a large surface area and cross-linked pore structure. The material showed favorable performance in both electrochemical energy storage and conversion applications. The optimized activated carbon achieved a remarkable specific capacitance of up to 549.7 F g⁻1 in a three-electrode setup and maintained 224.2 F g⁻1 at 1.0 A g⁻1 in a symmetrical supercapacitor device with excellent long-term cycling stability as high as 94% after 18,000 cycles. Furthermore, the SWAC-800 electrode (calcined at 800 ℃) showed strong bifunctional metal-free electrocatalytic performance with low hydrogen evolution reaction (HER) overpotentials of 170 and 268 mV, and oxygen evolution reaction (OER) overpotentials of 315 and 373 mV at current densities of 10 and 100 mA cm⁻2, respectively. The chronopotentiometric stability was maintained for 50 h at 50 mA cm⁻2. These results not only validate seaweed as a highly effective biomass precursor but also position the resulting material as a versatile, eco-friendly electrocatalyst for next-generation supercapacitors and green hydrogen production systems. Supplementary Material File (main manuscript.docx) Download 7.23 MB Information & Authors Information Version history V1 Version 1 30 January 2026 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords biochar seaweed biomass symmetric device waste-derived carbon material water splitting Authors Affiliations Lan Nguyen Jeju National University View all articles by this author Roshan Bhattarai University of Antwerp View all articles by this author Avik Denra Jeju National University View all articles by this author Kannan Krishnan Jeju National University View all articles by this author Mohan Kumara Panneer Selvam Jeju National University View all articles by this author Jonas Hereijgersb University of Antwerp View all articles by this author Young Sun Mok 0000-0002-6694-2135 [email protected] Jeju National University View all articles by this author Metrics & Citations Metrics Article Usage 118 views 56 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Lan Nguyen, Roshan Bhattarai, Avik Denra, et al. Harnessing Seaweed-Derived Multiporous Activated Carbon for High-Performance Energy Storage and Water Splitting Applications. Authorea . 30 January 2026. DOI: https://doi.org/10.22541/au.176979986.67616240/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . Format Please select one from the list RIS (ProCite, Reference Manager) EndNote BibTex Medlars RefWorks Direct import Tips for downloading citations document.getElementById('citMgrHelpLink').addEventListener('click', function() { popupHelp(this.href); return false; }); $(".js__slcInclude").on("change", function(e){ if ($(this).val() == 'refworks') $('#direct').prop("checked", false); $('#direct').prop("disabled", ($(this).val() == 'refworks')); }); View Options View options PDF View PDF Figures Tables Media Share Share Share article link Copy Link Copied! Copying failed. 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