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Perforated mesoporous NiO nanostructures for an enhanced pseudocapacitive performance with ultra-high rate capability and high energy density

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Abstract

We reported a morphology-controlled approach to improve the specific capacitance (Cs) and energy/power density of supercapacitors. The irregular morphologies of NiO transformed into perforated mesoporous nanobelts and further altered into nanoflakes. The nanobelts and nanoflakes of NiO with the average widths of ∼74 nm and ∼215 nm, respectively, formed films with the thicknesses of ∼5.8 and 2.7 μm, respectively. The mesoporous NiO nanobelts delivered a higher Cs value (i.e., 794 F g−1) than the nanoflakes (146 F g−1) and irregular morphologies (742 F g−1). Moreover, the nanobelts showed 88.6% retention after 2500 continuous charging–discharging cycles. The NiO nanobelts exhibited a power density of 2963 W kg−1 and energy density of 57 W h kg−1, which were significantly higher than those of pristine NiO nanoflakes, nanorods, 2D thin films, porosity-tuned nanowalls, nanofibers, and the heterostructures with the NiCo2O4 and Ni3S2 nanosheets. The perforated mesoporous NiO nanobelts with clearly visible textural boundaries exhibited a relatively larger surface area and excellent interconnecting network than the irregular morphologies and nanoflakes, which provided easy access to the OH ions for diffusion.

Graphical abstract: Perforated mesoporous NiO nanostructures for an enhanced pseudocapacitive performance with ultra-high rate capability and high energy density

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Publication details

The article was received on 19 Sep 2019, accepted on 18 Oct 2019 and first published on 18 Oct 2019


Article type: Paper
DOI: 10.1039/C9CE01475F
CrystEngComm, 2019, Advance Article

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    Perforated mesoporous NiO nanostructures for an enhanced pseudocapacitive performance with ultra-high rate capability and high energy density

    N. Kitchamsetti, P. R. Chikate, R. A. Patil, Y. Ma, P. M. Shirage and R. S. Devan, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE01475F

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