Chalcogen‐Directed Dual‐Heterointerfaced Bi 2 Te 3 /BiS x in N‐Doped Carbon Nanofibers for Sodium Storage

). Ex situ spectroscopy and microscopy elucidate the reversible phase evolution and sodium storage pathways, highlighting the critical role of dual heterointerfaces and defect engineering. This work establishes a general strategy for advancing high-energy, long-life sodium-ion batteries by exploiting dual crystalline/amorphous and chalcogen heterointerfaces within nanostructured composites.