Microwave driven cobalt metal organic framework catalyst activation for lithium-carbon dioxide battery

Lithium–carbon dioxide batteries are attaining prominence owing to their exceptionally high theoretical specific energy and their ability to fix CO 2 in situ during discharge, thereby coupling electrochemical energy storage with carbon capture. However, the combination of slow cathode chemistry and labor-intensive catalyst conditioning impedes practical adoption. Metal-organic frameworks (MOFs) are crystalline lattices of metal atoms bridged by organic linkers. Their ordered, ångström-wide channels and accessible metal sites make them attractive electrocatalysts, although lengthy solvent-exchange steps often waste their manufacturing advantage. Here we show that Co-MOF-74 can be activated for Li–CO 2 operation in a single, one-minute microwave pulse delivered in dimethyl sulfoxide. Rapid treatment removes trapped solvent molecules and produces surface reconstruction consistent with defect formation. The resulting cathode exhibits a larger surface area, a lower charge-transfer resistance and a much narrower voltage gap, translating into higher reversible capacity and longer cycle life in Li–CO 2 cells. DFT calculations show that a modeled linker vacancy lowers the relative energies of Co-centered adsorbate-containing states, indicating more favorable thermodynamics within the resulting locally undercoordinated environment. This solvent-assisted microwave route charts an energy-efficient path toward scalable Li–CO 2 batteries and other MOF-based electrochemical technologies.