MOF derived ZnSe–FeSe2/RGO Nanocomposites with enhanced sodium/potassium storage

ZnSe–FeSe2/reduced graphene oxide (RGO) composites are synthesized through a rational strategy using Fe/Zn-MOF-5 as a template. Compared with the ZnSe/RGO or FeSe2/RGO composites, the ZnSe–FeSe2/RGO anode electrode exhibits a higher reversible capacity (439 mAh g−1 after 100 cycles at 100 mA g−1) for sodium ion batteries (SIBs). The excellent electrochemical performance of ZnSe–FeSe2/RGO composites can be attributed to the synergistic effects of the unique architecture, where ZnSe is responsible for providing a high capacity, FeSe2 improves the electrochemical stability, and RGO is beneficial for enhancing the charge transfer behavior. Furthermore, the ZnSe–FeSe2/RGO anode reveals stable reversible capacity (363 mAh g−1 after 100 cycles at 50 mA g−1) for potassium ion batteries (KIBs).