Towards Real-Time Ion-Specific Structural Sensitivity in Nanoporous Carbon Electrodes Using in Situ Anomalous Small-Angle X-ray Scattering
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In: ACS Applied Materials and Interfaces, Vol. 11.2019, No. 45, 13.11.2019, p. 42214-42220.
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TY - JOUR
T1 - Towards Real-Time Ion-Specific Structural Sensitivity in Nanoporous Carbon Electrodes Using in Situ Anomalous Small-Angle X-ray Scattering
AU - Koczwara, Christian
AU - Prehal, Christian
AU - Haas, Sylvio
AU - Boesecke, Peter
AU - Huesing, Nicola
AU - Paris, Oskar
PY - 2019/11/13
Y1 - 2019/11/13
N2 - 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.
AB - 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.
KW - anomalous small-angle X-ray scattering
KW - EDLC
KW - in situ
KW - ion-specific
KW - structural sensitivity
KW - supercapacitor
UR - http://www.scopus.com/inward/record.url?scp=85074815323&partnerID=8YFLogxK
U2 - 10.1021/acsami.9b14242
DO - 10.1021/acsami.9b14242
M3 - Article
C2 - 31633905
AN - SCOPUS:85074815323
VL - 11.2019
SP - 42214
EP - 42220
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
SN - 1944-8244
IS - 45
ER -