Unlocking Modulation Rule of Heterointerface Engineering Induced D-Band Center on Polysulfides Conversion in Lithium-Sulfur Batteries.

MOF-derived heterostructures have been widely utilized as S hosts to address the three issues faced by the sulfur (S) cathode in lithium-sulfur batteries. Precisely pinpointing the active center in the heterostructure and unlocking the modulation rule of heterostructure on polysulfides (LiPSs) conversion are particularly important. Herein, the two homologous hetero-hosts of ZIF-67-derived CoSe@CoSeS/NC and CoSe@CoS/NC nanoparticles anchored in the nitrogen-doped carbon (NC) matrix are successfully constructed, and confirm that Co at the heterointerface is the primary active center, rather than Co within the individual phases.