In response to the global climate emergency caused by increasing atmospheric carbon dioxide (CO₂) concentrations, one of the most promising strategies is the capture and conversion of CO₂ (CCU) into value-added products. Among the various approaches, the Electrochemical CO₂ Reduction Reaction (eCO₂RR) enables the transformation of CO₂ into useful compounds through the use of electrolysers and specific electrocatalysts. In this context, bicarbonate electrolysers represent an innovative solution, capable of combining carbon capture and utilization in a single system, removing energy demanding process. However, these devices still present significant challenges for future scale-up and industrial implementation. This thesis focuses on the development of advanced materials and components to optimize integrated CO₂ capture and utilization in bicarbonate electrolysers, with the specific objective of designing a low-energy consumption, efficient electrolyser for the selective conversion of CO₂ into carbon monoxide (CO).