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  Ultrahigh water sorption on highly nitrogen doped carbonaceous materials derived from uric acid

Kossmann, J., Rothe, R., Heil, T., Antonietti, M., & Lopez Salas, N. (2021). Ultrahigh water sorption on highly nitrogen doped carbonaceous materials derived from uric acid. Journal of Colloid and Interface Science, 602, 880-888. doi:10.1016/j.jcis.2021.06.012.

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 Creators:
Kossmann, Janina1, Author              
Rothe, Regina2, Author              
Heil, Tobias2, Author              
Antonietti, Markus3, Author              
Lopez Salas, Nieves1, Author              
Affiliations:
1Nieves Lopez Salas, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3029702              
2Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863288              
3Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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Free keywords: Water adsorption, C1N1, Thermally driven adsorption chiller, adsorption heat pumps, hydrophilic N-doped carbon
 Abstract: Hypothesis: Developing materials for thermally driven adsorption chillers and adsorption heat pumps is a growing research field due to the potential of these technologies to address up to 50% of the world’s total energy demand. These materials must be abundant, easy to synthesize, hydrophilic, and low in cost. Bare carbon materials are hydrophobic and therefore usually not considered for these applications. However, by introducing heteroatoms and tuning their porosity, the hydrophilicity of carbonaceous networks can be increased significantly. Experimental: Herein, a series of highly nitrogen doped carbonaceous materials (CNs) have been synthesized by submitting uric acid to heat treatment at different temperatures in the presence of an inorganic salt mix as solvent and pore template. The effect of the thermal treatment on the materials composition, pore network, and water sorption capability has been studied. Findings: At 800 °C, a nitrogen depleted carbonaceous material with a maximal water uptake of 1.38 gH2O g-1 is obtained. Condensation at 750 °C creates an ultra-hydrophilic CN with a water uptake of 0.8 gH2O g-1at already much lower partial pressures. While the maximum uptake is mainly ascribed to the mesopore volume of the material, the differences in hydrophilicity can be controlled by functionality.

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 Dates: 2021-06-262021
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.jcis.2021.06.012
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Title: Journal of Colloid and Interface Science
  Abbreviation : J. Colloid Interface Sci.
Source Genre: Journal
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Publ. Info: Amsterdam etc. : Elsevier Inc.
Pages: - Volume / Issue: 602 Sequence Number: - Start / End Page: 880 - 888 Identifier: ISSN: 0021-9797