期刊
ACS APPLIED ENERGY MATERIALS
卷 1, 期 4, 页码 1540-1548出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.7b00343
关键词
nickel oxide; solution combustion microwave-assisted synthesis; nanoflakes; surface area; specific capacitance; cycling stability; supercapacitors
资金
- CSIR [9/45(1458)/2017-EMR-I]
- UGC
A facile and rapid surfactant-free microwave-assisted route is developed to synthesize 10 nm sized NiO nanoflakes with high pseudocapacitive performance for supercapacitor cells. The NiO nanoflakes exhibit mesoporous channels and a surface area as high as 206 m(2) g(-1) as revealed under BET study, while the structural identity verified by XRD and IR confirm the phase purity of NiO. NiO nanoflakes maintain similar to 85% of their thermal stability at temperature 900 degrees C which can be related to strong intermolecular forces between the NiO nanoparticles held in the molecular matrix. Electrochemical performance investigated in 6 M KOH solution suggests maximum specific capacitance of 307 F g(-1) for the NiO parallel to NiO cell at 0.5 A g(-1) sustaining about 96% capacitance after being successfully cycled up to 3000 cycles. The NiO nanoflakes reveal high conductivity of 33.87 S cm(-1) at room temperature. Precisely, nanosized NiO bearing flake morphology is of particular interest due to the high surface to volume aspect and porosity features-the determining factors for swift ion diffusion into an electrode and improved redox reaction. The illustrated microwave-assisted route unfolds as a direct synthesis method to obtain nanosized NiO flakes with high surface area facilitating excellent device performance characteristics without involving any surface-capping agents.
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