Erlangen 2018 – wissenschaftliches Programm

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AKE: Arbeitskreis Energie

AKE 10: Sector Coupling and Production of Chemical Feedstock by Electrocatalytic Reduction of CO₂

AKE 10.2: Hauptvortrag

Mittwoch, 7. März 2018, 14:45–15:30, RW HS

CO₂ to Value: Single Step Direct Electrocatalytic Reduction of CO₂ Toward CO and Hydrocarbons — •Guenter Schmid — Siemens AG, CT REE PXS, Guenther-Scharowsky-Strasse 1, 91058 Erlangen

Switching from fossil based to renewable power generation requires the installation of large overcapacities of wind and solar due to their intermittency. Storage or conversion possibilities are essential due the volatility of electricity. Economic feasibility is difficult when considering the low fossil energy carrier prices and the physical efficiency limitations of the processes. Therefore, we choose to focus on high-volume chemical feedstock such as Ethylene or CO, where the chemical value exceeds by far its pure heating value.

Electrocatalyts facilitate the conversion of CO₂ to valuable base chemical feedstock. For selectivity improvements substantial advances in electrode design are required and described.

CO could be obtained with faradaic efficiencies (FE) over 90% at current densities exceeding the industrially necessary level of several hundred mA/cm² with a total energy efficiency approaching 50%. Faradaic efficiencies up to 57% for ethylene at current densities above 150 mA/cm² could be obtained using in-situ-deposited nano-structured copper based electro catalysts. Liquid product analysis of the electrolyte revealed a strongly pronounced formation of ethanol (> 20% FE) accompanied by a wide range of C1-C3 alcohols, carboxylates and ketones with yields up to 5%.