Journal
JOURNAL OF ENERGY STORAGE
Volume 30, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2020.101539
Keywords
Microwave; Honeycomb nanostructure; Reduced graphene oxide; Transition metal oxides; Electrode materials; Supercapacitor; Cycle stability
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [P18063]
- JSPS KAKENHI [18F18063, JP-18H03841, JP-17K18985]
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Honeycomb-like open edges reduced graphene oxide nanosheets (HOrGO NSs) filled with transition metal oxides (TMOs) as NiO/Co3O4 nanoparticles (NPs) has been synthesized by a simple and cost-effective microwave irradiation method. The microwave irradiation assisted synthesized HOrGO filled with NiO/Co3O4 NPs (HOrGO/TMOs) hybrids exhibits high specific capacitance with improved cycling stability as excellent electrode materials for supercapacitors (SCs). The HOrGO NSs contains high surface area (570 m(2) g(-1)) due to highly exfoliated nanostructure comprising open edges enriched morphology. In HOrGO/TMOs hybrids, the several micron-sized (similar to 100 mu m) open edges of HOrGO NSs holds the NiO/Co3O4 NPs with finely separated thin few-layer graphene NSs. The structural/morphological analysis of synthesized HOrGO NSs and HOrGO/TMOs hybrids were extensively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectra, thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET) surface area. The HOrGO/TMOs hybrids deliver high specific capacitance of 910 F g(-1) and high robust cycling stability with capacitance retention as 89.9% after continuous 2000 cycles. The proposed mechanism explain the microwave irradiation assisted formation of HOrGO/TMOs hybrids and provides a general and low-cost approach to synthesized high quality graphene hybrids materials for SCs application.
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