ZnSe/FeSe 2 heterojunctions confined in N-doped carbon framework: built-in electric field and p-band center modulation toward superior sodium storage

ZnSe/FeSe 2 @NC heterojunction with p-band center regulation creates a built-in electric field, accelerating charge transfer and Na + diffusion: 508.9 mAh g −1 at 0.5 A g −1 , 390.0 mAh g −1 after 3800 cycles at 5 A g −1 .