Markus Nohl


Modeling of the high-temperature co-electrolysis

Program flowchart to thermodynamic and kinetic calculations Copyright: M. Nohl program flowchart to thermodynamic and kinetic calculations

High-temperature co-electrolysis can be a future key technology, because it offers the possibility to transfer electrical renewable energy to chemical energy in the form of high-value chemicals. Carbon dioxide is, together with water, converted to syngas, a unique mixture of H2 and CO. High-temperature co-electrolysis enables the production of a desired syngas ratio by a simple change of parameters. This is simultaneously reached at a high energetic efficiency. Syngas is used e.g. as basis for the production of different hydrocarbons and uses climate-damaging CO2 as a raw material, thereby creating added value in already existing syngas infrastructures.

In the framework of the Kopernikus project “Power-to-X” the modeling of individual processes taking place during co-electrolysis is the focus of this thesis. A model will be developed predicting the long-time performance of the electrochemical cell. To draw conclusions about kinetic parameters as well as their change as a function of time caused by degradation of the cell is important to make a life-time prediction of the cell possible.

The pursued approach targets obtaining a detailed theoretical description of the high-temperature co-electrolysis allowing both predictions about results from given input data as well as the possibility of “reverse-engineering”. This means assigning an optimal set of parameters to a desired given output of syngas ratio.