The traditional electrochemical caustic soda recovery system uses the generated pH gradient across the ion exchange membrane for the regeneration of spent alkaline absorbent from COsub.2 capture. This electrochemical COsub.2 capture system releases the by-products Hsub.2 and Osub.2 at the cathode and anode, respectively. Although effective for capturing COsub.2, the slow kinetics of the oxygen evolution reaction (OER) limit the energy efficiency of this technique. Hence, this study proposed and validated a hybrid electrochemical cell based on the Hsub.2-cycling from the cathode to the anode to eliminate the reliance on anodic oxygen generation. The results show that our lab-scale prototype enabled effective spent caustic soda recovery with an electron utilisation efficiency of 90%, and a relative carbonate/bicarbonate diffusional flux of approximately 40%. The system also enabled the regeneration of spent alkaline absorbent with a minimum electrochemical energy input of 0.19 kWh/kg COsub.2 at a COsub.2 recovery rate of 0.7 mol/msup.2/h, accounting for 30% lower energy demand than a control system without Hsub.2-recycling, making this technique a promising alternative to the conventional thermal regeneration technology.