X-ray Raman scattering for bulk chemical and structural insight into green carbon
| Autor: | Mahalingam Balasubramanian, Bhoopesh Mishra, Christoph J. Sahle, Luke J.R. Higgins |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Inelastic scattering 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Hydrothermal circulation XANES 0104 chemical sciences symbols.namesake X-ray Raman scattering Chemical engineering chemistry symbols Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy Carbon Pyrolysis Raman scattering |
| Zdroj: | 'Physical Chemistry Chemical Physics ', vol: 22, pages: 18435-18446 (2020) |
| ISSN: | 1463-9076 |
| Popis: | X-ray Raman scattering (XRS) spectroscopy is an emerging inelastic scattering technique which uses hard X-rays to study the X-ray absorption edges of low-Zelements (e.g.C, N, O) in bulk. This study applies XRS spectroscopy to pyrolysis and hydrothermal carbons. These materials are thermochemically-produced carbon from renewable resources and represent a route for the sustainable production of carbon materials for many applications. Results confirm local structural differences between biomass-derived (Oak,Quercus Ilex) pyrolysis and hydrothermal carbon. In comparison with NEXAFS, XRS spectroscopy has been shown to be more resilient to experimental artefacts such as self-absorption. Density functional theory XRS calculations of potential structural sub-units confirm that hydrothermal carbon is a highly disordered carbon material formed principally of furan units linked by the alpha carbon atoms. Comparison of two pyrolysis temperatures (450 degrees C and 650 degrees C) shows the development of an increasingly condensed carbon structure. Based on our results, we have proposed a semi-quantitative route to pyrolysis condensation. |
| Databáze: | OpenAIRE |
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