This study presents a novel approach to integrating hydrogen utilization in CO₂ electrolysis to reduce energy loss. The authors couple CO₂ electrolysis with hydrogen oxidation in a single electrochemical cell, using a Ni(OH)₂/NiOOH mediator to suppress anodic carbon loss and catalyst poisoning. This setup is highly flexible, producing either gaseous (CO) or soluble (formate) products with high selectivity and stability at voltages below 0.9 V (50 mA cm⁻²). By transferring the oxygen evolution reaction (OER) to a water electrolyzer with favorable thermodynamic and kinetic conditions, the total polarization loss and energy consumption are reduced by up to 22% and 42%, respectively. The work demonstrates the potential of combining CO₂ electrolysis with the hydrogen economy, offering improved energy and cost efficiency for various emerging energy conversion and storage approaches.This study presents a novel approach to integrating hydrogen utilization in CO₂ electrolysis to reduce energy loss. The authors couple CO₂ electrolysis with hydrogen oxidation in a single electrochemical cell, using a Ni(OH)₂/NiOOH mediator to suppress anodic carbon loss and catalyst poisoning. This setup is highly flexible, producing either gaseous (CO) or soluble (formate) products with high selectivity and stability at voltages below 0.9 V (50 mA cm⁻²). By transferring the oxygen evolution reaction (OER) to a water electrolyzer with favorable thermodynamic and kinetic conditions, the total polarization loss and energy consumption are reduced by up to 22% and 42%, respectively. The work demonstrates the potential of combining CO₂ electrolysis with the hydrogen economy, offering improved energy and cost efficiency for various emerging energy conversion and storage approaches.