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O: Fachverband Oberflächenphysik
O 18: Solid-Liquid Interfaces I: Structure and Spectroscopy
O 18.10: Talk
Monday, March 18, 2024, 17:15–17:30, H 1012
Tuning the HER activity by using ion confinement in layered MoS2 — •Marco Schönig1, Simon Fleischmann2, and Marc Koper1 — 1Leiden University, Leiden, The Netherlands — 2HIU, Ulm, Germany
The optimization of energy storage and conversion materials caused a decrease of the pore size in these materials to the nanometer scale. On this length scale the ions can not simply enter the pores but are forced to (partially) shed their solvation shell [1]. This so called "ion confinement" was shown to be promising way to increase the storage capacity of supercapacitors [2]. However, this effect is scarcely exploited in electrocatalysis, although ions close to the surface play an important role in several electrocatalytic reactions, including the HER [3]. In this contribution, we study the effect of the confinement of different ions on the activity of the HER at MoS2. This is achieved by tuning the ion confinement via the interlayer distance of the layered MoS2, as well as the ion diameter.
[1]Chmiola, J.; Yushin, G.; Gogotsi, Y.; Portet, C.; Simon, P.; Taberna, P.-L. Anomalous increase in carbon capacitance at pore sizes less than 1 nanometer Science, 2006, 313, 1760-1763. [2]Fleischmann, S.; Spencer, M. A.; Augustyn, V. Electrochemical Reactivity under Confinement Enabled by Molecularly Pillared 2D and Layered Materials Chem. Mater., 2020, 32, 3325-3334. [3]Monteiro, M. C. O.; Goyal, A.; Moerland, P.; Koper, M. T. M. Understanding Cation Trends for Hydrogen Evolution on Platinum and Gold Electrodes in Alkaline Media ACS Catal., 2021, 11, 14328-14335.
Keywords: hydrogen evolution; confinement; electrocatalysis