Meso-macroporous Co3O4 electrode prepared by polystyrene spheres and carbowax templates for supercapacitors

Li, Yanhua; Huang, Kelong; Liu, Suqin; Yao, Zufu; Zhuang, Shuxin

doi:10.1007/s10008-010-1128-3

Cited by 50 publications

(33 citation statements)

References 37 publications

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“…The R s and R ct values of Co 3 O 4 nanofibers is found to be 0.4 V and 1.6 V, respectively. These values are much lower than the same (Co 3 O 4 ) obtained with different morphologies by other conventional methods reported in the literature [15,20,32,46]. It implies that the Co 3 O 4 nanofibers have good capacitive behavior.…”

Section: Electrochemical Impedance Studiescontrasting

confidence: 64%

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Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Kumar

Angaiah

Balakrishnan

2014

Electrochimica Acta

140

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Section: Electrochemical Impedance Studiescontrasting

confidence: 64%

“…2 [31][32][33]. Therefore, the formation of single phase crystalline Co 3 O 4 nanofibers is in pure phase.…”

Section: Xrd Analysismentioning

confidence: 96%

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Kumar

Angaiah

Balakrishnan

2014

Electrochimica Acta

140

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“…In the high-frequency range, the intercept at real part (Z′) is a combinational resistance of ionic resistance of electrolyte, intrinsic resistance of substrate, and contact resistance between the active material and the current collector (R e ). The semicircle results from the charge transfer resistance (R ct ) caused by faradaic reactions and a constant phase element one (CPE) [28]. In the lowfrequency range, the straight sloping line represents the electrolyte diffusion process (W) and the diffusion of OH − ion in host materials [29].…”

Section: Electrochemical Measurementmentioning

confidence: 99%

Effect of surfactant on the morphology and capacitive performance of porous NiCo2O4

Kong

Lü

Liu

et al. 2013

J Solid State Electrochem

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A promising nickel cobaltite oxide (NiCo 2 O 4 ) composite electrode material was successfully synthesized by a sol-gel method and followed by a simple sintering process. The microstructure and surface morphology of NiCo 2 O 4 modified by hexadecyltrimethylammonium bromide (CTAB) and polyvinyl alcohol were physically characterized by powder X-ray diffraction and scanning electron microscopy. Meanwhile, electrochemical performance was widely investigated in 2 M KOH aqueous electrolyte using cyclic voltammetry, galvanostatic charge-discharge test, and electrochemical impedance spectroscopy. The results show that evident porous microstructure was successfully fabricated by CTAB. The NiCo 2 O 4 controlled by CTAB exhibited highly specific capacitance of 1,440 Fg −1 at a current density of 5 mAcm −2 . Remarkably, it still displays desirable cycle retention of 94.1 % over 1,000 cycle numbers at a current density of 20 mAcm −2 . The excellent electrochemical performance suggests its potential application in electrode material for electrochemical capacitors.

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“…1b, Co 3 O 4 film has covered the entire surface of TiO 2 nanotubes/Ti and despite high surface area, porosity of this electrode is not very high. Porosity is crucial to enhance the active material-electrolyte interfacial area and faster ion transfer inside the pore structure in supercapacitor applications [13,14]. Therefore, less contact between the electrode materials and the electrolyte leads to a decrease in the performance of this electrode.…”

Section: Morphology Characterizationmentioning

confidence: 99%

Preparation and electrochemical performances of nanoporous/cracked cobalt oxide layer for supercapacitors

Gobal

Faraji

2014

Appl. Phys. A

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Nanoporous/cracked structures of cobalt oxide (Co 3 O 4 ) electrodes were successfully fabricated by electroplating of zinc-cobalt onto previously formed TiO 2 nanotubes by anodizing of titanium, leaching of zinc in a concentrated alkaline solution and followed by drying and annealing at 400°C. The structure and morphology of the obtained Co 3 O 4 electrodes were characterized by X-ray diffraction, EDX analysis and scanning electron microscopy. The results showed that the obtained Co 3 O 4 electrodes were composed of the nanoporous/cracked structures with an average pore size of about 100 nm. The electrochemical capacitive behaviors of the nanoporous Co 3 O 4 electrodes were investigated by cyclic voltammetry, galvanostatic charge-discharge studies and electrochemical impedance spectroscopy in 1 M NaOH solution. The electrochemical data demonstrated that the electrodes display good capacitive behavior with a specific capacitance of 430 F g -1 at a current density of 1.0 A g -1 and specific capacitance retention of ca. 80 % after 10 days of being used in electrochemical experiments, indicating to be promising electroactive materials for supercapacitors. Furthermore, in comparison with electrodes prepared by simple cathodic deposition of cobalt onto TiO 2 nanotubes(without dealloying procedure), the impedance studies showed improved performances likely due to nanoporous/cracked structures of electrodes fabricated by dealloying of zinc, which provide fast ion and electron transfer routes and large reaction surface area with the ensued fast reaction kinetics.

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Meso-macroporous Co3O4 electrode prepared by polystyrene spheres and carbowax templates for supercapacitors

Cited by 50 publications

References 37 publications

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Effect of surfactant on the morphology and capacitive performance of porous NiCo2O4

Preparation and electrochemical performances of nanoporous/cracked cobalt oxide layer for supercapacitors

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