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Self-generation of low ash carbon microspheres from the hydrothermal supernatant of anaerobic digestate: Formation insights and supercapacitor performance
Umeå University, Faculty of Science and Technology, Department of Chemistry. Discipline of Chemistry, University of Newcastle, NSW, Callaghan, Australia.
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0002-2185-7885
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0001-8819-2278
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.ORCID iD: 0000-0003-1170-2203
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2021 (English)In: Chemical Engineering Journal Advances, E-ISSN 2666-8211, Vol. 6, article id 100097Article in journal (Refereed) Published
Abstract [en]

This work provides the first observations of and insights into the self-generation of carbon microspheres from the supernatant after hydrothermal carbonization of anaerobic digestate has been completed and the hydrochar removed. Solid State NMR and XPS revealed that the carbon microspheres were comprised of decomposed fragments of proteins, carbohydrates and lignin. The carbon microspheres were significantly lower in ash content (3.1%), compared to the hydrothermal solid (41.2%) and precursor (25.2%) and their formation reduced the total organic carbon load of the supernatant. The low ash content allowed them to be easily activated, achieving a surface area of 1711.0 m2 g−1, compared to 51.4 m2 g−1 for the activated hydrothermal solid and 12.8 m2 g−1 for the activated precursor. The microcarbon spheres achieved a specific capacitance from cyclic voltammetry of 86 F g−1 at 100 mV s−1 to 176 F g−1 at 1 mV s−1, while the gravimetric capacitance was 42 F g−1 at 25 A g−1 and 140 F g−1 at 0.5 A g−1 in 0.5 M Li2SO4 and a 1.8V potential window. Overall, this study highlights the importance of exploring this new product and its valorisation potential for the hydrothermal carbonization of ash-rich precursors.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 6, article id 100097
Keywords [en]
Electrochemical capacitors, Hydrochar, Sediment, Solid state NMR, Wet waste materials
National Category
Other Chemistry Topics Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-202953DOI: 10.1016/j.ceja.2021.100097Scopus ID: 2-s2.0-85112574865OAI: oai:DiVA.org:umu-202953DiVA, id: diva2:1727035
Available from: 2023-01-14 Created: 2023-01-14 Last updated: 2024-07-12Bibliographically approved

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Latham, Kenneth G.Kozyatnyk, IvanFigueira, JoaoCarlborg, MarkusJansson, Stina

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