Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 67: Solid-Liquid Interfaces III: OER, ORR, CO2RR, etc.
O 67.9: Talk
Wednesday, March 18, 2020, 12:45–13:00, WIL C107
Electroreduction of water on Mo2C film electrodes affected by the presence of CO2 — •Eva-Maria Wernig, Christoph Griesser, Daniel Winkler, Niusha Shakibi Nia, and Julia Kunze-Liebhäuser — Institute of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria
The materials class of transition metal carbides (TMCs) has gained importance among electrocatalysts for reduction processes such as the hydrogen evolution reaction (HER) and the CO2 reduction reaction (CO2RR). For a comprehensive understanding of the electrocatalytic properties of Mo2C towards the HER under CO2RR conditions in aqueous electrolytes, the present study merges materials science and interface analytics with electrochemistry. We report on the synthesis of Mo2C films using direct carburization of polycrystalline Mo substrates through carbothermal conversion. Cyclic voltammetry, complemented by rotating ring disc electrode (RRDE) measurements, was used to investigate the electrocatalytic activity of Mo2C films towards the HER in the absence and presence of CO2, while changes of the chemical composition at the surface were analyzed with ex-situ emersion X-ray photoelectron spectroscopy (XPS). In-situ infrared spectroscopy (SNIFTIRS) enabled the determination of reaction intermediates at the solid/liquid interface. Product analysis was accomplished with differential electrochemical mass spectrometry (DEMS) to monitor the formation of gaseous products such as hydrogen. The activity of Mo2C film electrodes towards the HER was found to be significantly enhanced in the presence of CO2.