The interplay of water and the hydrophilic ionic liquid [C4C1Im][BF4] on Pt(111)
Talwar T, Steinrück HP, Maier F (2026)
Publication Type: Journal article
Publication year: 2026
Book Volume: 770
Article Number: 122978
DOI: 10.1016/j.susc.2026.122978
Abstract
We investigated the thermal evolution of ultrathin coadsorbed films of the hydrophilic ionic liquid (IL) [C4C1Im][BF4] and water (D2O) on Pt(111) by temperature-programmed angle-resolved X-ray photoelectron spectroscopy. Ultrathin crystalline water wetting layers were prepared at 140 K, followed by deposition of one or several IL layers at 100 K. When post-deposited at 100 K, the IL primarily adsorbs on top of the water layer; upon heating, first an exchange process occurs at ∼130 K, such that the IL replaces water from the Pt surface into the second layer, as deduced from a lowered water desorption temperature by ∼9 K. At 150 K, water has desorbed, leaving a pure IL layer with a characteristic checkerboard arrangement of alternating anions and flat-lying cations. Upon further heating, this layer behaves identical to an IL layer directly adsorbed on clean Pt(111) at 100 K: Above ∼185 K, the IL decomposes stepwise, with anion-derived fragments fully desorbing until 400 K whereas most cation-derived products remain as carbonaceous residues up to at least 550 K. The observed behavior for [C4C1Im][BF4] is very similar to that of the previously studied hydrophobic ILs [C3CNC1Im][Tf2N] and [C1C1Im][Tf2N], which demonstrates that IL hydrophilicity does not markedly affect water-IL co-adsorption on Pt(111).
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How to cite
APA:
Talwar, T., Steinrück, H.-P., & Maier, F. (2026). The interplay of water and the hydrophilic ionic liquid [C4C1Im][BF4] on Pt(111). , 770. https://doi.org/10.1016/j.susc.2026.122978
MLA:
Talwar, Timo, Hans-Peter Steinrück, and Florian Maier. "The interplay of water and the hydrophilic ionic liquid [C4C1Im][BF4] on Pt(111)." 770 (2026).
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