In Situ Measurement of Electrosorption-Induced Deformation Reveals the Importance of Micropores in Hierarchical Carbons.

Autor: Koczwara C; Institute of Physics, Montanuniversitaet Leoben , Franz-Josef Straße 18, 8700 Leoben, Austria., Rumswinkel S; Materials Chemistry, Paris Lodron University Salzburg , Jakob-Haringer Strasse 2a, 5020 Salzburg, Austria., Prehal C; Institute of Physics, Montanuniversitaet Leoben , Franz-Josef Straße 18, 8700 Leoben, Austria., Jäckel N; INM - Leibniz Institute for New Materials , Campus D2 2, 66123 Saarbrücken, Germany.; Department of Materials Science and Engineering, Saarland University , Campus D2 2, 66123 Saarbrücken, Germany., Elsässer MS; Materials Chemistry, Paris Lodron University Salzburg , Jakob-Haringer Strasse 2a, 5020 Salzburg, Austria., Amenitsch H; Institute of Inorganic Chemistry, Graz University of Technology , Stremayrgasse 9/IV, 8010 Graz, Austria., Presser V; INM - Leibniz Institute for New Materials , Campus D2 2, 66123 Saarbrücken, Germany.; Department of Materials Science and Engineering, Saarland University , Campus D2 2, 66123 Saarbrücken, Germany., Hüsing N; Materials Chemistry, Paris Lodron University Salzburg , Jakob-Haringer Strasse 2a, 5020 Salzburg, Austria., Paris O; Institute of Physics, Montanuniversitaet Leoben , Franz-Josef Straße 18, 8700 Leoben, Austria.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2017 Jul 19; Vol. 9 (28), pp. 23319-23324. Date of Electronic Publication: 2017 Jul 03.
DOI: 10.1021/acsami.7b07058
Abstrakt: Dimensional changes in carbon-based supercapacitor electrodes were investigated using a combination of electrochemical dilatometry and in situ small-angle X-ray scattering. A novel hierarchical carbon material with ordered mesoporosity was synthesized, providing the unique possibility to track electrode expansion and shrinkage on the nanometer scale and the macroscopic scale simultaneously. Two carbons with similar mesopore structure but different amounts of micropores were investigated, employing two different aqueous electrolytes. The strain of the electrodes was always positive, but asymmetric with respect to positive and negative applied voltages. The asymmetry strongly increased with increasing microporosity, giving hints to the possible physical origin of electrosorption induced pore swelling.
Databáze: MEDLINE
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