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  Controlling pore size and pore functionality in sp2-conjugated microporous materials by precursor chemistry and salt templating

Youk, S., Hofmann, J. P., Badamdorj, B., Völkel, A., Antonietti, M., & Oschatz, M. (2020). Controlling pore size and pore functionality in sp2-conjugated microporous materials by precursor chemistry and salt templating. Journal of Materials Chemistry A, 8(41), 21680-21689. doi:10.1039/D0TA05856D.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-68A7-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-68A8-7
Genre: Journal Article

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 Creators:
Youk, Sol1, Author              
Hofmann, Jan P., Author
Badamdorj, Bolortuya2, Author              
Völkel, Antje3, Author              
Antonietti, Markus4, Author              
Oschatz, Martin1, Author              
Affiliations:
1Martin Oschatz, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364733              
2Nadezda V. Tarakina, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2522693              
3Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863288              
4Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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 Abstract: The synthesis of sp2-conjugated, heteroatom-rich, "carbonaceous" materials from economically feasible raw materials and salt templates is reported. Low cost citrazinic acid (2,6-dihydroxy-4-pyridinecarboxylic acid) and melamine are used as components to form a microporous, amorphous framework, where edges of the covalent frameworks are tightly terminated with nitrogen and oxygen moieties. ZnCl2 as the porogen stabilizes structural microporosity as well as nitrogen and oxygen heteroatoms up to comparably high condensation temperatures of 750 and 950 °C. The specific surface area up to 1265 m2 g−1 is mainly caused by micropores and typical of heteroatom-rich carbon materials with such structural porosity. The unusually high heteroatom content reveals that the edges and pores of the covalent structures are tightly lined with heteroatoms, while C–C or C–H bonds are expected to have a minor contribution as compared to typical carbon materials without or with minor content of heteroatoms. Adsorption of water vapor and carbon dioxide are exemplarily chosen to illustrate the impact of this heteroatom functionalization under salt-templating conditions on the adsorption properties of the materials. 27.10 mmol g−1 of H2O uptake (at p/p0 = 0.9) can be achieved, which also proves the very hydrophilic character of the pore walls, while the maximum CO2 uptake (at 273 K) is 5.3 mmol g−1. At the same time the CO2/N2 adsorption selectivity at 273 K can reach values of up to 60. All these values are beyond those of ordinary high surface area carbons, also differ from those of N-doped carbons, and are much closer to those of organized framework species, such as C2N.

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Language(s): eng - English
 Dates: 2020-09-252020
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/D0TA05856D
BibTex Citekey: D0TA05856D
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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 8 (41) Sequence Number: - Start / End Page: 21680 - 21689 Identifier: ISSN: 2050-7488