Markus Nohl


Development of a parameter matric for the prediction and application of product gas compositions in high-temperature co-electrolysis

Thermodynamic relations of the possible single-step reductions in the high-temperature co-electrolysis Copyright: [1] S. R. Foit, I. C. Vinke, L. G.J. de Haart, R.-A. Eichel: “Power-to-syngas – eine Schlüsseltechnologie für die Umstellung des Energiesystems?”, Angew. Chem., DOI: 10.1002/ange.201607552. Copyright Wiley-VCH Verlag GmbH & Co. KGaA. Reproduced with p

The high-temperature co-electrolysis offers the possibility to transfer environmentally polluting carbon dioxide together with water to syngas (H2 and CO). Thus, renewably produced energy in the grid is stored as chemical energy and made usable. So, co-electrolysis can be both used as a basis for the production of different hydrocarbons, allowing the usage of climate-damaging CO2 in a meaningful manner, and implemented in already existing syngas infrastructures.

Within the Kopernikus project “Power-to-X” the modeling and experimental examination of individual processes taking place during co-electrolysis is of interest in this thesis. The leading interrogation thereby is which composition of electrochemical elements describes the complex system consisting of high-temperature solid-oxide electrolysis cell and the reactions of the co-electrolysis at best. Electrochemical current/voltage characteristic lines and electrochemical impedance spectra are the basis of the experimental data. The pursued approach is going a reverse path, from the theory to the experiment. Simulations of equivalent circuits will be investigated for consistency with experimentally obtained data by means of Nyquist diagrams in order to forebode the syngas composition as product of the co-electrolysis on this broad basis.