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Nitrogen doped heat treated and activated hydrothermal carbon: NEXAFS examination of the carbon surface at different temperatures
Umeå University, Faculty of Science and Technology, Department of Chemistry. Discipline of Chemistry, University of Newcastle, Callaghan, NSW 2308, Australia.
2018 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 128, p. 179-190Article in journal (Refereed) Published
Abstract [en]

Hydrothermal carbons have been shown to have controllable surface functionalization through various post-treatment techniques, which indicates these materials may be tuned for specific applications. For this reason, Near Edge X-ray Absorption Fine Structure (NEXAFS) studies have been conducted on a series of nitrogen doped and non-doped heat treated and activated hydrothermal carbons to further understand the changes in surface functionality with treatment. The NEXAFS carbon K-edge spectrum of the non-doped samples displayed a loss of oxygen functionalities (C=O and C-OH) as well as the furan ring structure with increasing temperature, while C=C bonds from graphitic groups increased. This effect was amplified further upon the addition of phosphoric acid (H3PO4) during activation. The doped hydrothermal carbons displayed similar functionality to the non-doped, although the effect of both heat treatment and activation was diminished. The nitrogen K-edge displayed characteristic peaks for pyridine and imines/amides, with pyrroles located under the broad ionization step. This work represents the first time a series of heat treated and activated hydrothermal carbons have been examined via NEXAFS spectroscopy. Additionally, difference analysis has been applied to the NEXAFS spectra to obtain a deeper understanding in the changes in surface functionality, a previously unused technique for these materials. 

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 128, p. 179-190
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-143619DOI: 10.1016/j.carbon.2017.11.072ISI: 000418479900021OAI: oai:DiVA.org:umu-143619DiVA, id: diva2:1172692
Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2018-06-09Bibliographically approved

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Latham, Kenneth G.

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CiteExportLink to record
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Citation style
  • apa
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