以共吸附的CO作为测试分子研究离子液体与Pt(111)表面之间的相互作用。
Interaction between Ionic Liquids and a Pt(111) Surface Probed by Coadsorbed CO as a Test Molecule.
作者信息
Eschenbacher Roman, Schuschke Christian, Bühlmeyer Hanna, Taccardi Nicola, Wasserscheid Peter, Bauer Tanja, Xu Tao, Libuda Jörg
机构信息
Interface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany.
Institute of Chemical Reaction Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
出版信息
J Phys Chem Lett. 2021 Oct 21;12(41):10079-10085. doi: 10.1021/acs.jpclett.1c02983. Epub 2021 Oct 8.
We used temperature-programmed infrared reflection absorption spectroscopy (TP-IRAS) to study the desorption behavior of CO on Pt(111) coadsorbed with four kinds of ionic liquids (ILs), namely 1-butyl-1-methyl-pyrrolidinium-bis(trifluoromethylsulfonyl)imide ([CCPyr][NTf]), 1-ethyl-3-methyl-imidazolium-bis(trifluoromethylsulfonyl)imide ([CCIm][NTf]), 1-butyl-1-methyl-pyrrolidinium-trifluoro-methanesulfonate ([CCPyr][OTf]), and 1-butyl-1-methyl-pyrrolidinium-hexafluorophosphate ([CCPyr][PF]). We found that CO desorbs earlier from a Pt(111) surface with coadsorbed ILs than without. In addition, the CO desorption temperature varies between different types of coadsorbed ILs, which follows the order: [CCPyr][PF] (365 K) > [CCPyr][NTf] (362 K) > [CCIm][NTf] (352 K) > [CCPyr][OTf] (348 K). We ascribe the difference in CO desorption temperature to the different interaction strength between ILs and the Pt(111) surface. A stronger IL-Pt(111) interaction leads to a lower CO desorption temperature. We suggest that TP-IRAS experiments of CO coadsorbed with ILs can be a useful method to aid the characterization of the interaction strength between ILs and metal surfaces such as Pt(111).
我们使用程序升温红外反射吸收光谱法（TP - IRAS）研究了CO在与四种离子液体（ILs）共吸附的Pt(111)上的脱附行为，这四种离子液体分别是1 - 丁基 - 1 - 甲基 - 吡咯烷鎓 - 双（三氟甲基磺酰）亚胺（[CCPyr][NTf]）、1 - 乙基 - 3 - 甲基 - 咪唑鎓 - 双（三氟甲基磺酰）亚胺（[CCIm][NTf]）、1 - 丁基 - 1 - 甲基 - 吡咯烷鎓 - 三氟甲磺酸盐（[CCPyr][OTf]）和1 - 丁基 - 1 - 甲基 - 吡咯烷鎓 - 六氟磷酸盐（[CCPyr][PF]）。我们发现，与未共吸附离子液体的情况相比，CO从共吸附了离子液体的Pt(111)表面更早脱附。此外，不同类型共吸附离子液体的CO脱附温度不同，顺序如下：[CCPyr][PF]（365 K）>[CCPyr][NTf]（362 K）>[CCIm][NTf]（352 K）>[CCPyr][OTf]（348 K）。我们将CO脱附温度的差异归因于离子液体与Pt(111)表面之间不同的相互作用强度。更强的离子液体 - Pt(111)相互作用导致更低的CO脱附温度。我们认为，CO与离子液体共吸附的TP - IRAS实验可以作为一种有用的方法，有助于表征离子液体与诸如Pt(111)等金属表面之间的相互作用强度。
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