To reach the target of the European Union to become climate-neutral by 2050, the defossilization of the industry and the transport sector is essential. Certain sectors, like aviation and chemical production, are hard to abate if no alternatives arise. In this respect, CO₂ electrolysis is an interesting and quickly evolving alternative. While CO₂ electrolysis is slowly shifting towards increasing TRL and associated pitfalls are being identified, two aspects thus far insufficiently understood are (1) the impact of heat generated in industrial CO₂ electrolyzers and (2) the impact of elevated pressure. Both have an obvious impact on stability and also significantly alter the catalytic reaction mechanism. This proposal aims to enable efficient and stable CO₂ electrolyzer performance at temperatures above 60°C and pressures up to 30 bar under industrially relevant current densities. This requires an in-depth understanding of the mechanism of HER suppression on Au and/or Ag under batch conditions, implementing it on Cu and translating this to a flow cell by innovative carbon-based electrodes, and their integration into a transport-optimized electrolyzer. To achieve this, we need to gain an in-depth understanding of the impact of temperature and pressure through a combination of electrochemistry and (in-situ) physico-chemical characterization. If successful, this project will make CO₂ electrolysis more energy-efficient by allowing direct coupling with up- and downstream processes.