Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 897, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162640
Keywords
Reduced graphene oxide; Metal-organic framework; Manganese oxide; Ball-milling; All-solid-state supercapacitor
Categories
Funding
- National Natural Science Foundation of China [21973112]
- National Key R&D Program of China [2018YFA0208701]
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Metal oxide derived from metal-organic framework (MOF) can have unique architecture and properties. In this study, hierarchically nanostructured Mn3O4 is synthesized from Mn-BTC MOF and reduced graphene oxide (rGO) to create an rGO/Mn3O4 composite for high-performance supercapacitor electrode material. The optimized rGO/Mn3O4/Ni foam electrode exhibits excellent specific capacitance and cycling performance. The assembled all-solid-state symmetric supercapacitor based on the rGO/Mn3O4 composite demonstrates high energy density and power density.
Metal oxide derived from metal-organic framework (MOF) could possess unique architecture and special properties. In this work, hierarchically nanostructured Mn3O4 is synthesized from the thermal annealing of manganese-1,3,5-benzenetricarboxylate (Mn-BTC) MOF with the presence of reduced graphene oxide (rGO) to yield rGO/Mn3O4 composite for the high-performance supercapacitor electrode material. The porous rGO aerogel is prepared from the hydrothermal and freeze-drying processes. The effective combination of Mn-BTC and rGO aerogel is realized through a facile ball-milling method that endows Mn-BTC with a rod-like structure in the composite. Upon annealing, the Mn-BTC-derived Mn3O4 presents the unique structure of porous rods comprising nanoparticles in the resulting rGO/Mn3O4 composite. The optimized rGO/Mn3O4/Ni foam electrode achieves a specific capacitance of 420 F g-1 at 0.5 A g-1 and a superior cycling property. The assembled all-solidstate symmetric supercapacitor based on rGO/Mn3O4 composite delivers the energy density of 22.1 Wh kg-1 and power density of 3.0 kW kg-1. The excellent capacitive performance of the rGO/Mn3O4 electrode could be ascribed to the effective integration of Mn-BTC-derived manganese oxides with hierarchical structure and the rGO matrix, facilitating the ion/electron transport in the electrochemical process. (c) 2021 Elsevier B.V. All rights reserved.
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