Manganese doped Co3O4 mesoporous nanoneedle array for long cycle-stable supercapacitors

Li, Guangmin; Chen, Mingzhi; Ouyang, Yu; Yao, Di; Liu, Lu; Wang, Liang; Xia, Xifeng; Lei, Wu; Chen, Shen‐Ming; Mandler, Daniel; Hao, Qingli

doi:10.1016/j.apsusc.2018.11.099

Cited by 139 publications

(69 citation statements)

References 39 publications

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“…In the low frequency range, the slope of the plot corresponds to the diffusive resistance of OH − ions (Warburg impedance, W) within the Co 3 O 4 . The plot presents an evident straight line with a slope greater than 45 • , which indicates a valid electrolyte ion diffusion [30,34]. The equivalent circuit fitting the impedance spectrum, which involves R s , R ct , C dl , W, and pseudocapacitance (C ps ), is shown in the inset of Figure 6.…”

Section: Resultsmentioning

confidence: 97%

“…The Co3O4 in this paper can meet the need of not only high specific capacitance but also excellent rate capability. In addition, the performance of the Co3O4 is even better than some composites of cobalt oxides [34,54,55]. The superior electrochemical behaviors can first be explained by the stable morphology.…”

Section: Resultsmentioning

confidence: 99%

“…In the Co 2p core-level XPS spectrum seen in Figure 3a, the Co 2p was deconvoluted into two doublets. The peaks at 779.4 and 794.4 eV are related to Co 3+ , and the peaks at 780.4 and 795.7 eV are assigned to Co 2+ [34]. In the high-resolution XPS spectrum of O 1s seen in Figure 3b, the O 1s can be fit into three different peaks at binding energies of 529.9, 530,9, and 532 eV, which are referenced to the lattice oxygen, the OH − species absorbed onto surface, and the multiplicity of physical and chemical absorbed water near surface, respectively [35].…”

Section: Resultsmentioning

confidence: 99%

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Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

et al. 2019

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In this study, a zeolitic imidazolate framework-67 (ZIF-67) was prepared as a precursor using a facile hydrothermal method. After a calcination reaction in the air, the as-prepared precursor was converted to porous thin-wall hollow Co3O4 with its original frame structure almost preserved. The physical and chemical characterizations of the nanomaterial were analyzed systemically. The electrochemical tests indicate that the obtained Co3O4 possesses large specific capacitances of 988 and 925 F/g at 1 and 20 A/g accompanying an outstanding rate capability (a 93.6% capacitance retention) and retains 96.6% of the specific capacitance, even after 6000 continuous charge/discharge cycles. These excellent properties mark the Co3O4 a promising electrode material for high performance supercapacitors.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

et al. 2019

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“…Another recent example could be found in Mn-doped Co 3 O 4 mesoporous nanoneedle arrays, which delivered a high capacitance of 668.4 F g À1 compared to that of undoped Co 3 O 4 201.3 F g À1 at 1 A g À1 and excellent capacitance retention (104% aer 10 000 cycles at 6 A g À1 ). 48 More recently, the intentional creation of oxygen vacancies (V O ) has been explored to improve the intrinsic conductivity and electrochemical activity of transition metal oxides, and thus to increase their supercapacitor performance. As a pioneering study, Dunn et al studied the enhanced pseudocapacitive charge storage property of MoO 3Àx with oxygen vacancies.…”

Section: Microstructure and Electroconductivitymentioning

confidence: 99%

Metal oxide-based supercapacitors: progress and prospectives

et al. 2019

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“…On the other hand, Co 3 O 4 was doped with manganese (Mn) to produce a unique mesoporous by a one‐stage hydrothermal process, which used an electrode of supercapacitors. The annealing process for the composite Mn/Co 3 O 4 was followed through air atmosphere . Then, titanium oxide (TiO 2 ) was doped with Co to fabricate a composite by a spin coating process.…”

Section: Introductionmentioning

confidence: 99%

Spectrally selective coating of nanoparticles (Co₃O₄:Cr₂O₃) incorporated in carbon to captivate solar energy

et al. 2020

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Innovatory nanocomposite comprising nanomaterials Co 3 O 4 :Cr 2 O 3 and carbon (fuel ash) was designed to absorb solar energy. Different concentration ratios of Co 3 O 4 and Cr 2 O 3 nanoparticles were utilized as a dopant for fuel thin films synthesis via spin and casting methods on glass and aluminum substrates. The opticalproperties of the modified films demonstrated in the range of 250 to 1300 nm. The data were interpreted in terms of a phonon-assisted theory. Energy gap (E g ) of doped C was calculated with different concentration ratios of Co 3 O 4 :Cr 2 O 3 (0.5:2.5, 1:2, 1.5:1.5, 2:1, 2.5:0.5) wt%, and fixed concentration of C in 7wt%. The results showed E g of the doped samples in the range of 2.9 to 3.9 eV. In addition, the intensity of the solar radiation was measured. The absorptivity was in the range of 88 to 93.6%. The above results are comparable to those of semiconductors and have high absorptivity values when the nanocomposite was utilized on a flat plate collector as a coating to trap and absorb solar energy. K E Y W O R D S chromium oxide, cobalt oxide, emissivity and absorptivity, energy band gap, optical properties 1 | INTRODUCTIONGenerally, Iraq has 240 days of strong sunlight with energy of 5 kWh per square meter in a day. 1 Harvesting solar energy and utilizing it in domestic applications, such as heating the water or ventilation residential complexes, would be highly cost effective and environment friendly. Nanocomposite films are used for this purpose. The technology includes the use of the nanocomposite films as a coating on a flat plate collector to be spectrally selective surface. This surface has low emissivity and high absorptivity to solar energy to convert this solar light into heat. 1,2 Doping nanomaterials with carbon can cause a remarkable change to its optical properties. [3][4][5] Cobalt oxide (Co 3 O 4 ) is a prevalent factor having several oxidization states because of its unusual chemical and physical features. It is used in ceramics production as an additional factor to produce blue coloring glazes, photo-catalysis, 6-10 and absorbance energy storage. 5,11 Further, Co 3 O 4 does has significant electrical properties. When Co 3 O 4 is added to chromium oxide (Cr 2 O 3 ), a conductive network is created through the pores. 12-15 Among the oxides family, Co 3 O 4 is one of the multilateral oxide sided, it has properties similar to a p-type semiconductor, and the band gap ranges from 2.23 to 3.38 eV. 16,17 Co 3 O 4 has attracted exceptional attention in the domain of application technology for pigments and solar-selective surfaces. [18][19][20] The particle size of Co 3 O 4 for nano-or micro-size provides perfect performance for electrochemical of different ranges in electronic applications and solar energy coating. [21][22][23][24] Nanocrystalline thin films nickel-cobalt oxides (NiO-CoO) were deposited on steel and glass substrates to produce thin films of different concentrations by the chemical bath deposition (CBD) method. These thin films exhibited semiconductor feature...

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Manganese doped Co3O4 mesoporous nanoneedle array for long cycle-stable supercapacitors

Cited by 139 publications

References 39 publications

Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

Metal oxide-based supercapacitors: progress and prospectives

Spectrally selective coating of nanoparticles (Co₃O₄:Cr₂O₃) incorporated in carbon to captivate solar energy

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Manganese doped Co3O4 mesoporous nanoneedle array for long cycle-stable supercapacitors

Cited by 139 publications

References 39 publications

Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

Metal oxide-based supercapacitors: progress and prospectives

Spectrally selective coating of nanoparticles (Co3O4:Cr2O3) incorporated in carbon to captivate solar energy

Contact Info

Product

Resources

About

Spectrally selective coating of nanoparticles (Co₃O₄:Cr₂O₃) incorporated in carbon to captivate solar energy