Emerging electrolyzers designed for electrochemical conversion of (bi)carbonate into CO can be effectively integrated with CO₂ capture processes. Within these conventional bicarbonate conversion schemes, a bipolar membrane or cation exchange membrane is used to deliver protons to the cathode where they convert (bi)carbonate ions into CO₂ that is subsequently reduced at the cathode. However, these membranes can be susceptible to fouling or degradation and may add substantial cost. Here, we demonstrate a packed bed membraneless electrolyzer (PBME) design for the conversion of bicarbonate into CO based on sequentially-placed porous flow-through electrodes. Hydrogen oxidation reaction at the anode is used to produce protons in order to facilitate CO₂ release for electrochemical CO₂ reduction at the downstream cathode in this membrane-free electrolyzer design. This study highlights the ability of PBME to rapidly balance pH across electrodes. In addition, the multi-cell PBME results reveal enhanced performance compared to single-cell PBMEs and demonstrate the scalability of this concept.