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X-ray Raman scattering for bulk chemical and structural insight into green carbon

DOI: 10.1039/D0CP00417K DOI Help

Authors: Luke J. R. Higgins (University of Leeds) , Christoph Johannes Sahle (European Synchrotron Radiation Facility) , Mahalingam Balasubramanian (Advanced Photon Source) , Bhoopesh Mishra (University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics

State: Published (Approved)
Published: July 2020
Diamond Proposal Number(s): 19228 , 23583

Open Access Open Access

Abstract: 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-Z elements (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 α carbon atoms. Comparison of two pyrolysis temperatures (450 °C and 650 °C) shows the development of an increasingly condensed carbon structure. Based on our results, we have proposed a semi-quantitative route to pyrolysis condensation.

Subject Areas: Chemistry

Instruments: I08-Scanning X-ray Microscopy beamline (SXM)

Other Facilities: Advanced Photon Source; Canadian Light Source