(704a) MOF-Derived Metal Oxide Composites for High Performance Energy Storage
AIChE Annual Meeting
2021
2021 Annual Meeting
Nanoscale Science and Engineering Forum
Nanomaterials for Energy Storage and Conversion 3
Tuesday, November 9, 2021 - 3:30pm to 3:50pm
The advanced approaches to develop high performance electroactive materials mainly focus on introducing more electrochemically active sites, shortening ionic pathways, faster charge transfer kinetics. This will be only achieved by careful selection of appropriate electroactive material as well as rational design of hybrid electrode architecture using conductive scaffolds such as graphene. We tend to focus more on exploiting methods to improve the electrochemical performance of metal oxides composites by trying to understand better the metal oxide composite formation and the metal oxide/graphene interfacial interactions and its effect the electrochemical kinetics of our composite structure.
In this work, we adopt a rational strategy to synthesize NiCo2O4/Co3O4 metal nanostructures. Highly porous ZIF-67 nanocrystals are firstly produced through coordination modulation process. By carefully etching these structures, ZIF-67/Ni-Co layered double-hydroxide template is formed. The as-prepared templates are subsequently calcinated to obtain the NiCo2O4/Co3O4 metal nanostructures. Later, to prevent the agglomeration and improve the charge transfer properties of our structures, the surface of as-prepared nanostructures is functionalized using a silanization process and mixed with graphene oxide dispersion to form self-assembled NiCo2O4/Co3O4-rGO composite structures. We report NiCo2O4/Co3O4-rGO composite structure with a capacity of 969 F g-1 at current density of 1 A g-1 showing a remarkable stability of showing 93% of initial capacitance after 10000 cycles of charge-discharge using electrodes with a high mass loading (~4 mg cm-2).