Influence of Synthesis Temperature on the Growth and Surface Morphology of Co3O4 Nanocubes for Supercapacitor Applications

Samal, Rashmi Rekha; Dash, Barsha; Sarangi, Chinmaya Kumar; Sanjay, Kali; Subbaiah, T.; Senanayake, Gamini; Minakshi, Manickam

doi:10.3390/nano7110356

Cited by 57 publications

(32 citation statements)

References 41 publications

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“…5c). The specic capacitance of the NF/CoOx electrode exhibited 42 and Co 3 O 4 nanocubes (833 F g À1 at 50 mV s À1 ), 43 respectively. In addition, long cycling behavior is another important factor for the practical prospects of a supercapacitor.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of NF/ZnOx and NF/CoOx nanostructures for high performance supercapacitor electrode materials

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Facile synthesis of NF/ZnOx and NF/CoOx nanostructures for high performance supercapacitor electrode materials

et al. 2019

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“…According to the Raman spectra, the prepared sample was confirmed to be a Co 3 O 4 /GR composite [ 49 ]; the characteristic Raman bands for Co 3 O 4 positioned at 475 cm −1 , 518 cm −1 , and 682 cm −1 were prominent ( Figure 3 b), which is in line with the aforementioned XRD analysis. Co 3 O 4 was identified as the main phase because there were nearly no characteristic cobalt hydroxide Co(OH) 2 bands present at 219 cm −1 and 1068 cm −1 [ 50 ]. From the Raman analysis, it is clear that the chosen hydrothermal temperature (165 °C) largely prevented impurity (Co(OH) 2 ) formation.…”

Section: Resultsmentioning

confidence: 99%

Formation of Nanocrystalline Cobalt Oxide-Decorated Graphene for Secondary Lithium-Air Battery and Its Catalytic Performance in Concentrated Alkaline Solutions

Peng

Lue

2020

Nanomaterials

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A potent cathode catalyst of octahedral cobalt oxide (Co3O4) was synthesized onto graphene (GR) nanosheets via a two-step preparation method. The precursor cobalt solution reacted with GR during the initial hydrolysis step to form intermediates. A subsequent hydrothermal reaction promoted Co3O4 crystallinity with a crystalline size of 73 nm, resulting in octahedral particles of 100–300 nm in size. Scanning electron microscopy, Raman spectroscopy, and X-ray diffraction analysis confirmed the successful formation of the Co3O4/GR composite. This catalyst composite was sprayed onto a carbon cloth to form a cathode for the hybrid electrolyte lithium-air battery (HELAB). This catalyst demonstrated improved oxygen reduction and oxygen evolution capabilities. The HELAB containing this catalyst showed a higher discharge voltage and stable charge voltage, resulting in a 34% reduction in overall over-potential compared to that without the Co3O4/GR composite. The use of saturated LiOH in 11.6 M LiCl aqueous electrolyte at the cathode further reduced the over-potential by 0.5 V. It is proposed that the suppressed dissociation of LiOH expedites the charging reaction from un-dissociated LiOH. This Co3O4/GR composite is a promising bi-functional catalyst, suitable as a cathode material for a HELAB operating in high relative humidity and highly alkaline environment.

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“…(Figure 8c), under a constant voltage scan rate, a constant current should be observed resulting in a rectangular shape for the CV curve. However, we must consider that the capacitor is in series with an equivalent internal resistor (R = Rs + Rc + Rp) [27]. As with the TRG cell (Figure 8a), the charging or discharging current of the capacitor required a time constant (RC) to reach the steady state current [28].…”

Section: Resultsmentioning

confidence: 99%

High-Performance Asymmetric Supercapacitors Based on the Surfactant/Ionic Liquid Complex Intercalated Reduced Graphene Oxide Composites

2018

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In this paper, ionic surfactants are employed to intercalate thermally-reduced graphene oxide (TRG). The ionic interaction between the intercalated surfactant and the ionic liquid could lead to the formation of large-sized ionic aggregates and, hence, enlarge the interlayer distance between the TRG sheets. The morphology and vibration modes of these composites were systematically characterized using XRD (X-ray diffraction), SAXS (small-angle X-ray scattering), and FTIR (Fourier transform infrared spectroscopy). An asymmetric supercapacitor, which consisted of a cationic surfactant-intercalated electrode on one side and an anionic surfactant-intercalated electrode on the other, was examined. It was found that, with the increased interlayer distance, the energy density and capacitance of the cells were improved. It seems that the cell with a cationic surfactant as the cathode had the best energy density of 67.8 Wh/kg, which is 4.4-fold higher than that of the TRG cell.

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Influence of Synthesis Temperature on the Growth and Surface Morphology of Co3O4 Nanocubes for Supercapacitor Applications

Cited by 57 publications

References 41 publications

Facile synthesis of NF/ZnOx and NF/CoOx nanostructures for high performance supercapacitor electrode materials

Facile synthesis of NF/ZnOx and NF/CoOx nanostructures for high performance supercapacitor electrode materials

Formation of Nanocrystalline Cobalt Oxide-Decorated Graphene for Secondary Lithium-Air Battery and Its Catalytic Performance in Concentrated Alkaline Solutions

High-Performance Asymmetric Supercapacitors Based on the Surfactant/Ionic Liquid Complex Intercalated Reduced Graphene Oxide Composites

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