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)center dot 2H(2)O]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. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Metal organic frameworks (MOFs) are used as precursors to derive inorganic electrode materials for high-performance sodium-ion batteries (SIBs) and lithium-ion batteries (LIBs). A novel orthorhombic bimetallic organic framework, ZnCeL, was synthesized and successfully fabricated into ZnSe/CeO2/RGO composites, showing excellent sodium and lithium-storage performances. The electrochemical kinetic analysis indicates that the redox reactions are mainly dominated by pseudocapacitive behavior, highlighting the potential of bimetallic organic frameworks for energy storage applications.