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The band inversion in topological phase matters bring exotic physicalproperties such as the emergence of a topologically protected surface states.They strongly influence the surface electronic structures of the investigatedmaterials and could serve as a good platform to gain insight into the catalyticmechanism of surface reactions. Here we synthesized high-quality bulk singlecrystals of the topological semimetal Co$_3$Sn$_2$S$_2$. We found that at roomtemperature, Co$_3$Sn$_2$S$_2$ naturally hosts the band structure of atopological semimetal. This guarantees the existence of robust surface statesfrom the Co atoms. Bulk single crystal of Co$_3$Sn$_2$S$_2$ exposes theirKagome lattice that constructed by Co atoms and have high electricalconductivity. They serves as catalytic centers for oxygen evolution process(OER), making bonding and electron transfer more efficient due to the partiallyfilled $e_g$ orbital. The bulk single crystal exhibits outstanding OERcatalytic performance, although the surface area is much smaller than that ofCo-based nanostructured catalysts. Our findings emphasize the importance oftailoring topological non-trivial surface states for the rational design ofhigh-activity electrocatalysts.

Surface states in bulk single crystal of topological semimetal Co$_3$Sn$_2$S$_2$ towards water oxidation