Towards Real-Time Ion-Specific Structural Sensitivity in Nanoporous Carbon Electrodes Using In Situ Anomalous Small-Angle X-ray Scattering.

Autor:	Koczwara C; Institute of Physics , Montanuniversitaet Leoben , Franz-Josef Straße 18 , 8700 Leoben , Austria., Prehal C; Institute of Physics , Montanuniversitaet Leoben , Franz-Josef Straße 18 , 8700 Leoben , Austria.; Institute for Chemistry and Technology of Materials , Graz University of Technology , Stremayrgasse 9 , 8010 Graz , Austria., Haas S; Photon Science , DESY , Notkestraße 85 , 22607 Hamburg , Germany., Boesecke P; European Synchrotron Radiation Facility (ESRF) , 6 Rue Jules Horowitz, BP 220 , 38043 Grenoble , France., Huesing N; Chemistry and Physics of Materials , University of Salzburg , Jakob-Haringer Str. 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] 2019 Nov 13; Vol. 11 (45), pp. 42214-42220. Date of Electronic Publication: 2019 Nov 04.
DOI:	10.1021/acsami.9b14242
Abstrakt:	Current in situ techniques to study ion charge storage and electrical double-layer formation in nanoporous electrodes are either chemically sensitive to element-specific concentration changes or structurally sensitive to rearrangements of ions and solvent molecules; but rarely can they cover both. Here we introduce in situ anomalous small-angle X-ray scattering (ASAXS) as a unique method to extract both real-time structural and ion-specific chemical information from one single experiment. Using a 1 M RbBr aqueous electrolyte and a hierarchical micro- and mesoporous carbon electrode, we identify different charging mechanisms for positive and negative applied potentials. We are able not only to track the global concentration change of each ion species individually, but also to observe their individual local rearrangement within the pore space.
Databáze:	MEDLINE
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