(660j) Tuning MOF-Based Metal Oxide Composite Structures for High Performance Energy Storage
AIChE Annual Meeting
Friday, November 20, 2020 - 10:15am to 10:30am
In this work, the designed synthesis of NiCo2O4(Co3O4) double shell nanocages (DSNCs) from zeolitic imidazolate framework-67 is studied. The DSNCs are later embedded with graphene to enhance their conductivity and electrochemical performance. The strategy includes the synthesis of zeolite imidazolate framework-67(ZIF-67)/Ni-Co layer doubled hydroxide(LDH) precursor and subsequent transformation to NiCo2O4(Co3O4) DSNC by thermal annealing. The as-prepared DSNC structure is wrapped with graphene structure through a simple electrostatic self-assembly. Here, we focused on tuning the microstructure of NiCo2O4(Co3O4) DSNCs by controlling the crystal size of ZIF-67 and Ni-Co LDH formation while etching the initial MOF template.
NiCo2O4(Co3O4)@rGO composite structure showed a capacitance of 969 F.g-1 at a discharge current density of 1 A.g-1 and a remarkable stability, holding 88% of the initial capacitance after 10000 cycles of charge-discharge.
This work shows a universal process for controlled synthesis of different complex spinel structures that can be used for various applications.