Reichelt, ErikErikReicheltHerz, GregorGregorHerzJahn, MatthiasMatthiasJahn2025-02-252025-02-252025https://publica.fraunhofer.de/handle/publica/48422810.1007/978-3-031-62411-7_20In the context of power-to-liquid (PtL) processes for the production of synthetic fuels the generation of syngas is a key step. Co-electrolysis in high-temperature electrolyzers is a promising option for single-step generation of syngas from H2O and CO2. In this chapter an overview on co-electrolysis is given, covering the thermodynamic and technological basics as well as the applied approach for scale-up. Experimental results from a small-scale demonstration unit allow for an assessment of the importance of heat integration within the system. The advantage of increased PtL energetic efficiency by thermal coupling of co-electrolysis and synthesis is discussed, highlighting the future potential of co-electrolysis in the context of synthetic fuel production.enCo-electrolysisEfficiencyHigh-temperature electrolysisSolid oxide electrolysisSyngas generation600 Technik, Medizin, angewandte Wissenschaftenbook article