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Nitrogen Doped Heat-Treated and Activated Hydrothermal Carbon: examination of Electrochemical Performance Using Step Potential Electrochemical Spectroscopy
Umeå University, Faculty of Science and Technology, Department of Chemistry. Discipline of Chemistry, University of Newcastle, Callaghan, Australia.
2018 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 165, no 11, p. A2840-A2848Article in journal (Refereed) Published
Abstract [en]

Step potential electrochemical spectroscopy (SPECS) has been applied to nitrogen-doped and non-doped hydrothermal carbons that have been activated or heat-treated at a range of temperatures. The highest surface area achieved was 422 m(2).g(-1) under heat-treatment at 600 degrees C, and 2275 m(2).g(-1) using H3PO4 chemical activation at 800 degrees C. The heat-treated series reported a maximum capacitance of 84 F.g(-1) at 10 mV.s(-1), whereas the activated series had a maximum capacitance of 306 F.g(-1) at 10 mV.s(-1) . SPECS analysis revealed that pseudo-capacitance for the hydrothermal carbon doped with nitrogen was interlinked with the degree of oxygen functionality, and that decreasing the oxygen content of the surface increased the pseudo-capacitance contribution from nitrogen. Pseudo-capacitance also increased with activation from the incorporation of phosphate groups; however, the nitrogen-doped hydrothermal carbons displayed minimal double-layer capacitance (60.6 F.g(-1) at 10 mV.s(-1)) despite having reasonable surface areas (1500-1600 m(2).g(-1)).

Place, publisher, year, edition, pages
Electrochemical Society, 2018. Vol. 165, no 11, p. A2840-A2848
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-152206DOI: 10.1149/2.0811811jesISI: 000443911100001OAI: oai:DiVA.org:umu-152206DiVA, id: diva2:1258771
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Bio4EnergyAvailable from: 2018-10-25 Created: 2018-10-25 Last updated: 2019-09-02Bibliographically approved

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Latham, Kenneth G.

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CiteExportLink to record
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