Sulfur edge in molybdenum disulfide nanosheets achieves efficient uranium binding and electrocatalytic extraction in seawater

. After 30 min electrolysis in 100 mL of real seawater with 100 times concentrated uranium (330 ppb), the extracted uranium (29.5 μg) consumes electricity of 8.7 mW h. Moreover, we concentrated 12 L of real seawater (3.3 ppb) into 20 mL of aqueous solution containing 1752.6 ppb U by adding a reverse potential. In the mechanistic study, we directly observed the uranium clusters and single atoms confined by the S-edge at atomic resolution, which served as the intermediate and accounted for the boosted uranium extraction in seawater.