Because of their high theoretical energy density, metal-CO batteries based on Li, Na, or K have attracted increasing attention recently for meeting the growing demands of CO recycling and conversion into electrical energy. However, the scarcity of active anode material resources, high cost, as well as safety concerns of Li, Na, and K create obstacles for practical applications. Herein, we demonstrate for the first time a high-efficiency (η = 77.2%) rechargeable Fe-CO battery that is composed of iron (Fe) anode and MoS-catalysts deposited carbon cathode. MoS catalysts are crucial to the successful acceleration of reaction kinetics of Fe during charge and discharge with a minimum overpotential of the cell. The Fe-CO cell has a higher initial specific capacity of 12,500 mA h g with an average discharge potential of 0.65 V and operates reversibly with a lower overpotential than that of Li-CO batteries with a cutoff capacity of 500 mA h g. Our Fe-CO battery can effectively convert CO greenhouse gas into electrical energy by consuming 1 ton of CO with usage of 1.23 tons of iron.
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