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AKE: Arbeitskreis Energie

AKE 8: CO₂ Electro-Reduction

AKE 8.3: Vortrag

Montag, 7. März 2016, 17:45–18:00, H3

Enhancing Process Stability for the Electrolysis of Carbon Dioxide with Ionic Liquids — •Sebastian S. Neubauer¹, Ralf K. Krause², Joachim Wecker², Dirk M. Guldi¹, and Guenter Schmid² — ¹Department of Chemistry and Pharmacy, FAU, Egerlandstr. 3, 91058 Erlangen, Germany — ²Siemens AG, Günter-Scharowsky-Str. 1, 91058 Erlangen, Germany

The production of valuable synthetic fuels and / or chemical feedstock out of waste CO₂ constitutes a key challenge in the contemporary field of energy storage. CO₂ is converted in a single step via a direct electrocatalytic process affording high efficiencies.
The conversion of CO₂ to carbon monoxide (CO) is a hot topic and the focus of this work. Studies, which were conducted in recent years, utilized mainly aqueous electrolytes. Rather short process stabilities and the competing hydrogen evolution reaction (HER) remain as major problems. In this context, ionic liquids have evolved as versatile solvent for the electrocatalytic conversion.^[1] Considering their unique properties such as high ion conductivity, wide electrochemical window, and low Henry constant for CO₂, they potentially inhibit HER and shift the electron transfer towards CO₂ reduction. We identified ideal operation conditions for selected ionic liquids in the matter of working electrode potential and electrolysis stability. To this end, understanding and controlling electrophoresis is crucial with regard to the stability. The major conclusion of our work is the realization of high Faraday efficiencies for CO formation within a stable process, while HER is inhibited. [1] B. A. Rosen et al., Science 2011, 334, pp. 643-644