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

Abstract

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(L7)·2H2O]n (termed as ZnCeL, L = 5-aminoisophthalic acid) with 3D open framework was synthesized via a simple solvothermal reaction. Then ZnSe/CeO2/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 CeO2 with electrocatalytic property are wrapped by conductive RGO. Herein, ZnSe/CeO2/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/CeO2/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.