Efficient CO2 Utilization via a Hybrid Na-CO2 System Based on CO2 Dissolution

Carbon capture, utilization, and sequestration technologies have been extensively studied to utilize carbon dioxide (CO 2 ), a greenhouse gas, as a resource. So far, however, effective technologies have not been proposed owing to the low efficiency conversion rate and high energy requirements. Here, we present a hybrid Na-CO 2 cell that can continuously produce electrical energy and hydrogen through efficient CO 2 conversion with stable operation for over 1,000 hr from spontaneous CO 2 dissolution in aqueous solution. In addition, this system has the advantage of not regenerating CO 2 during charging process, unlike aprotic metal-CO 2 cells. This system could serve as a novel CO 2 utilization technology and high-value-added electrical energy and hydrogen production device. • Hybrid Na-CO 2 cell continuously produces electricity and H 2 through CO 2 conversion • Hybrid Na-CO 2 does not regenerate CO 2 during charging, unlike aprotic metal-CO 2 cells • Highly stable operation over 1,000 hr was achieved with CO 2 utilization Environmental Chemical Engineering; Environmental Science; Energy Materials