Competition of Acetone Reduction and Hydrogen Evolution on Pt Single Crystal Electrodes in the Absence and Presence of the Ionic Liquid [C2C1Im][OTf]

Kastenmeier M, Franz E, Waidhas F, Yang T, Taccardi N, Wasserscheid P, Brummel O, Libuda J (2023)

Publication Type: Journal article

Publication year: 2023

Journal

DOI: 10.1021/acs.jpcc.3c06260

Abstract

In heterogeneous catalysis, ionic liquids (ILs) are used as chemical modifiers to control selectivity. In our work, we aim to apply the same concept to electrocatalytic systems. We studied two competing reactions on low index platinum (111), (100), and (110) single crystal electrodes, namely, the hydrogen evolution reaction (HER) and the acetone reduction reaction. We used the IL [C2C1Im][OTf] dissolved in the supporting electrolyte (0.1 M HClO4) as chemical modifier. In our study, we combined cyclic voltammetry (CV), electrochemical infrared reflection absorption spectroscopy (EC-IRRAS), and differential electrochemical mass spectrometry (DEMS). On all three surfaces, the HER is the predominant reaction at potentials below 0.00 VRHE. While Pt(100) and Pt(111) show no or very low activity toward the reduction of acetone, the Pt(110) surface is active for this reaction in a potential window between 0.08 and 0.00 VRHE. We identified propane to be the main product of acetone reduction. Additionally, we observed the formation of adsorbed COads. In the presence of low concentrations of the IL (0.001 M), acetone reduction is fully suppressed and the activity for HER increases. We assign these effects to the specific adsorption of the IL, which blocks the adsorption sites for sterically more demanding acetone, while the coadsorbate layer remains permeable for the sterically less demanding hydrogen formation. Our results illustrate the potential of ionic liquids to act as molecular filters, which block a specific reaction channel.

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How to cite

APA:

Kastenmeier, M., Franz, E., Waidhas, F., Yang, T., Taccardi, N., Wasserscheid, P.,... Libuda, J. (2023). Competition of Acetone Reduction and Hydrogen Evolution on Pt Single Crystal Electrodes in the Absence and Presence of the Ionic Liquid [C2C1Im][OTf]. Journal of Physical Chemistry C. https://doi.org/10.1021/acs.jpcc.3c06260

MLA:

Kastenmeier, Maximilian, et al. "Competition of Acetone Reduction and Hydrogen Evolution on Pt Single Crystal Electrodes in the Absence and Presence of the Ionic Liquid [C2C1Im][OTf]." Journal of Physical Chemistry C (2023).

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