Vallachira Warriam Sasikumar, Pradeep ; Zera, Emanuele ; Graczyk-Zajac, Magdalena ; Riedel, Ralf ; Soraru, Gian Domenico ; Dunn, B. (2016)
Structural Design of Polymer-Derived SiOC Ceramic Aerogels for High-Rate Li Ion Storage Applications.
In: Journal of the American Ceramic Society, 99 (9)
doi: 10.1111/jace.14323
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
SiOC ceramic aerogels with different porosity, pore size, and specific surface area have been synthesized through the polymer-derived ceramic route by modifying the synthesis parameters and the pyrolysis steps. Preceramic aerogels are prepared by cross-linking a linear polysiloxane with divinylbenzene (DVB) via hydrosilylation reaction in the presence of a Pt catalyst under highly diluted conditions. Acetone and cyclohexane are used as solvent in our study. Wet gels are subsequently supercritically dried with CO2 to get the final preceramic aerogels. The SiOC ceramic aerogels are obtained after a pyrolysis treatment at 900°C in two different atmospheres: pure Ar and H2 (3%)/Ar mixtures. The nature of the solvent has a profound influence of the aerogel microstructure in terms of porosity, pore size, and specific surface area. Synthesized SiOC ceramic aerogels have similar chemical compositions irrespective of processing conditions with ~40 wt% of free carbon distributed within remaining mixed SiOC matrix. The BET surface areas range from 215 m2/g for acetone samples to 80 m2/g for samples derived from cyclohexane solvent. The electrochemical characterization reveals a high specific reversible capacity of more than 900 mAh/g at a charging rate of C (360 mA/g) along with a good cycling stability. Samples pyrolyzed in H2/Ar atmosphere show a high reversible capacity of 200 mAh/g even at a high charging/discharging rate of 20 C. Initial capacities were recovered after whole cycling procedure indicating their structural stabilities resisting any kind of exfoliations.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Vallachira Warriam Sasikumar, Pradeep ; Zera, Emanuele ; Graczyk-Zajac, Magdalena ; Riedel, Ralf ; Soraru, Gian Domenico ; Dunn, B. |
| Art des Eintrags: | Bibliographie |
| Titel: | Structural Design of Polymer-Derived SiOC Ceramic Aerogels for High-Rate Li Ion Storage Applications |
| Sprache: | Englisch |
| Publikationsjahr: | 15 September 2016 |
| Verlag: | Wiley |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 99 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1111/jace.14323 |
| Kurzbeschreibung (Abstract): | SiOC ceramic aerogels with different porosity, pore size, and specific surface area have been synthesized through the polymer-derived ceramic route by modifying the synthesis parameters and the pyrolysis steps. Preceramic aerogels are prepared by cross-linking a linear polysiloxane with divinylbenzene (DVB) via hydrosilylation reaction in the presence of a Pt catalyst under highly diluted conditions. Acetone and cyclohexane are used as solvent in our study. Wet gels are subsequently supercritically dried with CO2 to get the final preceramic aerogels. The SiOC ceramic aerogels are obtained after a pyrolysis treatment at 900°C in two different atmospheres: pure Ar and H2 (3%)/Ar mixtures. The nature of the solvent has a profound influence of the aerogel microstructure in terms of porosity, pore size, and specific surface area. Synthesized SiOC ceramic aerogels have similar chemical compositions irrespective of processing conditions with ~40 wt% of free carbon distributed within remaining mixed SiOC matrix. The BET surface areas range from 215 m2/g for acetone samples to 80 m2/g for samples derived from cyclohexane solvent. The electrochemical characterization reveals a high specific reversible capacity of more than 900 mAh/g at a charging rate of C (360 mA/g) along with a good cycling stability. Samples pyrolyzed in H2/Ar atmosphere show a high reversible capacity of 200 mAh/g even at a high charging/discharging rate of 20 C. Initial capacities were recovered after whole cycling procedure indicating their structural stabilities resisting any kind of exfoliations. |
| Freie Schlagworte: | polymer precursor, porous materials, electrochemistry, aerogel/aerosol, silicon oxycarbide |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 04 Jan 2017 13:09 |
| Letzte Änderung: | 04 Jan 2017 13:09 |
| PPN: | |
| Sponsoren: | Funded by German Research Foundation. Grant Numbers: SFB 595/A4, SPP 1473/JP8, Funded by EU. Grant Number: CT-264873 |
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