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Publisher DOI: 10.1039/d0ma01025a
Title: Metal-doped carbons from polyurea-crosslinked alginate aerogel beads
Language: English
Authors: Raptopoulos, Grigorios 
Papastergiou, Maria 
Chriti, Despoina 
Effraimopoulou, Eleni 
Čendak, Tomaž 
Samartzis, Nikolaos 
Mali, Gregor 
Ioannides, Theophilos 
Gurikov, Pavel 
Smirnova, Irina  
Paraskevopoulou, Patrina 
Issue Date: 24-Mar-2021
Publisher: Royal Society of Chemistry
Source: Materials Advances 2 (8): 2684-2699 (2021-04-21)
Abstract (english): 
Metal-doped polyurea-crosslinked alginate aerogel beads (X-M-alginate; M: Ca, Co, Ni, Cu) were prepared via the reaction of an aromatic triisocyanate (Desmodur RE) with the -OH groups on the surface of pre-formed M-alginate wet gels, and with adsorbed gelation water. The X-M-alginate aerogels consisted of 49-63% polyurea and contained 2-7% metal ions; they were fibrous macro/meso/microporous materials with porosities up to 94% v/v, and BET surface areas 245-486 m2 g-1, comparable to those of native M-alginate aerogels (258-542 m2 g-1). The pyrolysis of X-M-alginate aerogels (M: Co, Ni, Cu) at 800 °C yielded carbon aerogels (X-M-C; 33-37% yield) doped with the corresponding metal (as well as with Cu2O in the case of X-Cu-C), with crystallite sizes of around 22 nm. The X-M-C aerogels retained the general fibrous morphology of their precursor (X-M-alginate) aerogels, and while X-Co-C and X-Ni-C appeared similar, the fibrous morphology of X-Cu-C was distinctly different, indicating an effect of the metal on the nanostructure of the corresponding carbon. The porosities of all X-M-C aerogels were in the range of 88-92% v/v, including macro-, meso- and micropores. Their BET surface areas were in the range of 426-541 m2 g-1, of which 208-319 m2 g-1 was allocated to micropores. In addition to the metals, XPS, Raman and FTIR analyses showed the presence of oxygen and nitrogen functionalities. Carbon in the X-M-C aerogels showed signs of stacking of graphene oxide sheets (14-15 nm), but also a low degree of graphitization and a large number of defects. This work provides a direct, inexpensive method for the preparation of fibrous metal-, oxygen- and nitrogen-doped carbon aerogels with potential for catalytic and electrochemical applications.
DOI: 10.15480/882.3549
ISSN: 2633-5409
Journal: Materials advances 
Institute: Entwicklung und Modellierung neuartiger nanoporöser Materialien V-EXK2 
Thermische Verfahrenstechnik V-8 
Document Type: Article
Project: Advanced Engineering and Research of aeroGels for Environment and Life Sciences 
New generation of nanoporous organic and hybrid aerogels for industrial applications: from the lab to pilot scale production - NanoHybrids 
More Funding information: PP and MP acknowledge the CERIC-ERIC (proposal number 20187018) for access to experimental facilities and financial support. NS and TI acknowledge support by the project ‘‘Materials and Processes for Energy and Environment Applications’’ (MIS 5002556), which was implemented under the ‘‘Action for the Strategic Development on the Research and Technological Sector’’, funded by the Operational Program ‘‘Competitiveness, Entrepreneurship and Innovation’’ (NSRF 2014–2020) and co-financed by Greece and the European Union (European Regional Development Fund).
License: CC BY-NC 3.0 (Attribution-NonCommercial) CC BY-NC 3.0 (Attribution-NonCommercial)
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