Low‐Temperature CO₂ Reduction using Mg–Ga Liquid Metal Interface

Abstract

Abstract The need for effective and adaptive technologies for carbon dioxide (CO 2 ) mitigation targeting global net‐zero carbon emissions is critically growing. Hence, innovative technologies for CO 2 reduction have attracted worldwide interest from scientific research communities. The use of liquid metals for the conversion of CO 2 into carbon or solid carbonaceous products has gained increasing attention in recent years due to their high activity and resistance to coking. Here, a facile approach for the reduction of CO 2 to solid carbon using liquid Mg at and near room temperature, and atmospheric pressure is presented. In this process, magnesium (Mg) plays a major role in driving the dissociation of CO 2 to its elemental constituents, carbon and oxygen. During the reaction process, Mg ions dissolve in gallium (Ga) liquid metal alloy, diffuse to the gas–liquid interface, and reduce CO 2 to carbon while undergoing an oxidation reaction. The electrochemical method ensures a sustainable cyclic process by reducing Mg and Ga ions back to their metallic counterpart. The use of liquid metal alloys for CO 2 reduction reactions can enable to achieve CO 2 capture and storage at room temperature, setting a new foundation for the future exploration of efficient CO 2 mitigation issues.