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X-ray computed micro-tomography of reticulated vitreous carbon

X-ray computed micro-tomography of reticulated vitreous carbon
X-ray computed micro-tomography of reticulated vitreous carbon
The 3D structure of various grades of reticulated vitreous carbon (RVC) is studied by X-ray computed micro-tomography (μCT). The settings required to estimate the bulk volumetric surface area accurately are investigated and the results are compared to those obtained from scanning electron microscopy and from pressure drop measurements via the Ergun equation. A resolution of 1.3 μm per voxel in μCT imaging is needed to determine the volumetric surface area, but its value is highly dependent on post-processing. A resolution of 9.6 μm per voxel underestimated the volumetric surface area, Ae, by a factor of up to 0.64 due to an incomplete resolution of the cell struts. This latter resolution is, however, sufficient to establish the volumetric porosity and the relative density. Theoretical estimations of electrical resistivity using these properties are consistent with those reported in the literature. Cell volume and cell surface area distributions are then obtained from computational analysis of the digitally rendered structure of 100 ppi RVC. Both cases can be approximated by a gamma function. Suitable instrumental μCT conditions for performing metrological studies on bare and modified RVC are proposed. Opportunities for the modelling of decorated and coated digitally rendered RVC are discussed.
reticulated vitreous carbon, reticulated vitreous carbon (rvc), RVC electrode, RVC, carbon foam, porous electrode, porous electrodes, foam, conductivity, resistivity, tomography, Tomography, X-Ray Computed, tomographic imaging, glassy carbon, Pore structure, electrochemistry, electrochemical reactor, electrochemical oxidation, electrochemical flow reactor, electrochemical deposition, pore size, gamma distribution, surface area
0008-6223
85-94
Arenas, Luis F.
6e7e3d10-2aab-4fc3-a6d4-63a6614d0403
Boardman, Richard P.
5818d677-5732-4e8a-a342-7164dbb10df1
Ponce De Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2
Arenas, Luis F.
6e7e3d10-2aab-4fc3-a6d4-63a6614d0403
Boardman, Richard P.
5818d677-5732-4e8a-a342-7164dbb10df1
Ponce De Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2

Arenas, Luis F., Boardman, Richard P., Ponce De Leon, Carlos and Walsh, Frank C. (2018) X-ray computed micro-tomography of reticulated vitreous carbon. Carbon, 135, 85-94. (doi:10.1016/j.carbon.2018.03.088).

Record type: Article

Abstract

The 3D structure of various grades of reticulated vitreous carbon (RVC) is studied by X-ray computed micro-tomography (μCT). The settings required to estimate the bulk volumetric surface area accurately are investigated and the results are compared to those obtained from scanning electron microscopy and from pressure drop measurements via the Ergun equation. A resolution of 1.3 μm per voxel in μCT imaging is needed to determine the volumetric surface area, but its value is highly dependent on post-processing. A resolution of 9.6 μm per voxel underestimated the volumetric surface area, Ae, by a factor of up to 0.64 due to an incomplete resolution of the cell struts. This latter resolution is, however, sufficient to establish the volumetric porosity and the relative density. Theoretical estimations of electrical resistivity using these properties are consistent with those reported in the literature. Cell volume and cell surface area distributions are then obtained from computational analysis of the digitally rendered structure of 100 ppi RVC. Both cases can be approximated by a gamma function. Suitable instrumental μCT conditions for performing metrological studies on bare and modified RVC are proposed. Opportunities for the modelling of decorated and coated digitally rendered RVC are discussed.

Text
CARBON RVC manuscript Arenas 29-03-2018 accepted - Accepted Manuscript
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More information

Accepted/In Press date: 28 March 2018
e-pub ahead of print date: 11 April 2018
Published date: 1 August 2018
Keywords: reticulated vitreous carbon, reticulated vitreous carbon (rvc), RVC electrode, RVC, carbon foam, porous electrode, porous electrodes, foam, conductivity, resistivity, tomography, Tomography, X-Ray Computed, tomographic imaging, glassy carbon, Pore structure, electrochemistry, electrochemical reactor, electrochemical oxidation, electrochemical flow reactor, electrochemical deposition, pore size, gamma distribution, surface area

Identifiers

Local EPrints ID: 419285
URI: http://eprints.soton.ac.uk/id/eprint/419285
ISSN: 0008-6223
PURE UUID: 8ce9db93-c2ef-42b3-aee8-06f5e859a33e
ORCID for Carlos Ponce De Leon: ORCID iD orcid.org/0000-0002-1907-5913

Catalogue record

Date deposited: 10 Apr 2018 16:30
Last modified: 17 Dec 2019 05:30

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