Despite their high theoretical specific energy of 2,600 Wh kg-1, the commercialization of Li-S devices is hindered by irreversible capacity loss from the dissolution of polysulfide intermediates in the electrolyte solution. We report novel strategies to design reactive sites for polysulfide adsorption in metal-organic frameworks (MOFs) to improve capacity retention and ionic conductivity. Incorporation of redox-active moieties in the framework further enable fast charge and discharge capabilities. Identifying structure-property-function relationships in tunable molecular platforms offer new methods to advance electrochemical storage technologies. In addition, we will present new strategies to probe the electrode-electrolyte interfaces in electrocatalysis using advanced electrochemical techniques such as in-situ vibrational spectroscopy and electrochemical impedance spectroscopy. The ubiquity of surfactants and carbon supports in catalysis warrants a closer examination on their influence on the electrode-electrolyte interface during carbon dioxide reduction. New insights on the impact of molecular additives and carbonaceous materials on product formation and Faradaic efficiency in electrocatalytic carbon conversion will be discussed.






Sara Thoi (Johns Hopkins University)