Journal
IONICS
Volume 27, Issue 1, Pages 339-349Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-020-03797-x
Keywords
Reduced graphene oxide; Co3O4; Nanocomposites; Structure optimization; Supercapacitor
Funding
- Stae Key Research Development Program of China [2018YFC0604705]
- National Natural Science Foundation of China [51974302]
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The study utilized a hydrothermal and calcination method to prepare Co3O4/rGO composite, which exhibited excellent performance in electrochemical supercapacitors. This was attributed to the synergy between rGO and Co3O4, as well as the unique three-dimensional structure obtained through changing the hydrothermal conditions.
In this work, a simple and environmental one step-hydrothermal and calcination method was used to prepare Co3O4/reduced graphene oxide (rGO) composite. The result shows that tiny Co(3)O(4)nanoparticles are dispersed on rGO sheets to form a three-dimensional structure, which provides more active sites than Co(3)O(4)nanowires structure. When acting as an electrochemical supercapacitor, structure optimized Co3O4/rGO-120-12 electrode exhibits high specific capacitance of 1152 F/g at 1 A/g in 6 M KOH electrolyte. As an assemble device, Co3O4/rGO reveals higher specific capacitance (about 85 F/g) than Co3O4(about 36 F/g) at current density of 1 A/g and excellent stability with 89.1% after 5000 cycles. The device exhibits a relatively high energy density of 57.26 Wh/kg at a power density of 2240.68 W/kg. Hence, the superior pseudocapacitive performance of Co3O4/rGO can be ascribed to the synergy between rGO and Co(3)O(4)as well as the excellent three-dimensional structure obtained by changing the hydrothermal conditions.
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