Please use this identifier to cite or link to this item:
Volltext verfügbar? / Dokumentlieferung
doi:10.22028/D291-28773
Title: | Comparing pore structure models of nanoporous carbons obtained from small angle X-ray scattering and gas adsorption |
Author(s): | Prehal, Christian Grätz, Sven Krüner, Benjamin Thommes, Matthias Borchardt, Lars Presser, Volker Paris, Oskar |
Language: | English |
Title: | Carbon : an international journal sponsored by the American Carbon Society |
Volume: | 152 |
Startpage: | 416 |
Endpage: | 423 |
Publisher/Platform: | Elsevier |
Year of Publication: | 2019 |
Publikation type: | Journal Article |
Abstract: | The performance of nanoporous carbons, used for hydrogen storage, ionic charge storage, or selective gas separation, is strongly determined by their pore shape and size distribution. Two frequently used experimental techniques to characterize the nanopore structure of carbons are gas adsorption combined with quenched-solid density functional theory and small angle X-ray scattering. However, neither of the two techniques can unambiguously derive a valid pore model for disordered pore structures without making assumptions. Here, we quantitatively compare pore size distributions from X-ray scattering and gas adsorption data. We generate three-dimensional pore models of activated carbons using small angle scattering and the concept of Gaussian Random Fields. These pore models are used to generate pore size distributions inherently containing a slit-pore assumption, making them comparable to pore size distributions obtained from gas adsorption analysis. This is realized by probing the effective adsorption potential via sampling of the three-dimensional pore structure with a probing adsorbate and calculating a “Degree of Confinement” parameter accounting for local pore geometry effects. We also generate pore size distributions with an alternative definition of pore size and discuss intricacies of gas adsorption results, such as the dependence on the underlying pore model in disordered microporous carbons. |
DOI of the first publication: | 10.1016/j.carbon.2019.06.008 |
URL of the first publication: | https://www.sciencedirect.com/science/article/pii/S0008622319305640 |
Link to this record: | hdl:20.500.11880/27731 http://dx.doi.org/10.22028/D291-28773 |
ISSN: | 0008-6223 |
Date of registration: | 10-Sep-2019 |
Faculty: | NT - Naturwissenschaftlich- Technische Fakultät |
Department: | NT - Materialwissenschaft und Werkstofftechnik |
Professorship: | NT - Prof. Dr. Volker Presser |
Collections: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Files for this record:
There are no files associated with this item.
Items in SciDok are protected by copyright, with all rights reserved, unless otherwise indicated.