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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19881

Title: Characterizing the Influence of Water on Charging and Layering at Electrified Ionic-Liquid/Solid Interfaces
Authors: Cheng, Hsiu-Wei
Stock, Philipp
Moeremans, Boaz
Baimpos, Theodoros
Banquy, Xavier
Renner, Frank Uwe
Valtiner, Markus
Issue Date: 2015
Abstract: The importance of water on molecular ion structuring and charging mechanism of solid interfaces in room temperature ionic liquid (RTIL) is unclear and has been largely ignored. Water may alter structures, charging characteristics, and hence performance at electrified solid/RTIL interfaces and is utilized in various fields including energy storage, conversion, or catalysis. Here, atomic force microscopy and surface forces apparatus experiments are utilized to directly measure how water alters the interfacial structuring and charging characteristics of [C(2)mim][Tf2N] on mica and electrified gold surfaces. On hydrophilic and ionophobic mica surfaces, water-saturated [C(2)mim][Tf2N] dissolves surface-bound cations, which leads to high surface charging and strong layering. In contrast, layering of dry RTIL at weakly charged mica surfaces is weakly structured. At electrified, hydrophobic, and ionophilic gold electrodes, significant water effects are found only at positive applied electrochemical potentials. Here, the influence of water is limited to interactions within the RTIL layers, and is not related to a direct electrosorption of water on the polarized electrode. More generally, the results suggest that effects of water on interfacial structuring of RTIL strongly depend on both (1) surface charging mechanism and (2) interfacial wetting properties. This may greatly impact utilization/design of RTILs and surfaces for interface-dominated processes.
Notes: [Cheng, Hsiu-Wei; Stock, Philipp; Baimpos, Theodoros; Valtiner, Markus] Max Planck Inst Eisenforsch GmbH, Dept Interface Chem & Surface Engn, D-40237 Dusseldorf, Germany. [Moeremans, Boaz; Renner, Frank Uwe] Hasselt Univ, Inst Mat Res, BE-3500 Hasselt, Belgium. [Banquy, Xavier] Univ Montreal, Fac Pharm, Canada Res Chair Bioinspired Mat, Montreal, PQ H3C 3J7, Canada.
URI: http://hdl.handle.net/1942/19881
DOI: 10.1002/admi.201500159
ISI #: 000360057500006
ISSN: 2196-7350
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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