Zn-Ce based bimetallic organic frameworks derived ZnSe/CeO2 nanoparticles encapsulated by reduced graphene oxide for enhanced sodium-ion and lithium-ion storage

Metal-organic frameworks (MOFs) are used to derive inorganic material, which is an effective way to achieve high performance electrode materials for sodium-ion batteries (SIBs) and lithium ion batteries (LIBs). In this work, a novel orthorhombic bimetallic organic framework, [ZnCe(L 7 )·2H 2 O]n (termed as ZnCeL, L = 5-aminoisophthalic acid) with 3D open framework was synthesized via a simple solvothermal reaction. Then ZnSe/CeO 2 /RGO was successfully fabricated via pyrolysis and selenization of ZnCeL and graphene oxide (RGO) composites. In the hybrid, ZnSe with high theoretical specific capacity and CeO 2 with electrocatalytic property are wrapped by conductive RGO. Herein, ZnSe/CeO 2 /RGO displays excellent sodium and lithium-storage performances. It reveals a sodium storage capacity of 113.2 mAh g −1 after 2000 cycles at 2.0 A g −1 . Meanwhile, ZnSe/CeO 2 /RGO as an anode for LIBs delivers a reversible capacity of 675 mAh g −1 at 0.1 A g −1 after 200 cycles. The electrochemical kinetic analysis reveals that the redox reactions are dominated by pseudocapacitive behavior. The excellent performance reveals a bright prospect of the bimetallic organic frameworks derived inorganic material for energy storage.