Electrodeposited reduced-graphene oxide/cobalt oxide electrodes for charge storage applications

García-Gómez, Alejandra; Eugénio, S.; Duarte, R.G.; Silva, T.M.; Carmezim, M.J.; Montemor, M.F.

doi:10.1016/j.apsusc.2016.04.113

Cited by 26 publications

(11 citation statements)

References 41 publications

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“…These techniques require the use of binders and conductive materials, which increase the electrode resistance affecting their supercapacitance performance. 17,18 Recently, electrodeposition has become a useful technique for growing Co-O nanostructures with desired composition and morphology directly onto the substrates without necessitating the use of binders. In electrodeposition, several factors such as electrolyte composition, temperature, type of electrodeposition mode, duration of the electrode deposition process, etc., can be adjusted to obtain the desired morphology and texture such as nanoporous structure, nanocolumnar structure, and nanoflower-like structure.…”

Section: Introductionmentioning

confidence: 99%

Specific capacitance behavior of Co‐Co ₃ O ₄ nanocomposite thin films synthesized via different electrodeposition modes

Nuamah

Noormohammed

Sarkar

2021

Intl J of Energy Research

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High capacitance Co-Co 3 O 4 nanocomposite thin films have been synthesized on nickel foam (NF) using cyclic voltammetry (CV), combination of cyclic voltammetry and potentiostatic (CV PS À1.4 V and CV PS +1 V), and combination of cyclic voltammetry and pulse reverse potential (CV PRP) modes of electrodeposition. X-ray diffraction (XRD) studies reveal the presence of Co and Co 3 O 4 phases for the four electrodeposition modes. The scanning electron microscope (SEM) revealed an interesting morphology correlating the electrochemical and capacitance behavior, while the energy-dispersive X-ray spectroscopy (EDX) spectra confirmed the varying quantities of Co and O in the Co-Co 3 O 4 nanocomposite thin films. The presence of Co-O bonds were also confirmed by the attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectra obtained on these films. The capacitance values of Co-Co 3 O 4composite thin films obtained by CV, CV PS À1.4 V, CV PS +1 V, and CV PRP, respectively, were found to be 1661, 1400, 1866, and 2580 F g À1 at an applied current load of 1 A g À1 , while the capacitance retentions after 500 cycles under a high current load of 20 A g À1 for the same were 85.8%, 77.8%, 87.1%, and 90.5%, respectively. The high capacitance and their retention of the electrodeposited Co-Co 3 O 4 nanocomposite thin films show potentials as high-performance supercapacitor electrode.

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Section: Introductionmentioning

confidence: 99%

Specific capacitance behavior of Co‐Co ₃ O ₄ nanocomposite thin films synthesized via different electrodeposition modes

Nuamah

Noormohammed

Sarkar

2021

Intl J of Energy Research

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“…In this regard, Zhao et al, coelectrodeposited a MnO2/graphene oxide coating on carbon paper using cyclic voltammetry and the composite used as electrode for SCs (Supercapacitors), which displayed increased electrochemical charge storage ability, attaining specific capacitances of 829 F g -1 at current density of 1 A g -1 [38]. More recently, García-Gómez and co-workers [39] electrodeposited CoOx/graphene foams, using a one-step electrodeposition process on stainless steel substrate.…”

Section: Nanostructured Transition Metal Oxides and Hydroxides Have Amentioning

confidence: 99%

One-step fabrication of electrochemically reduced graphene oxide/nickel oxide composite for binder-free supercapacitors

Shahrokhian

Mohammadi

Asadian

2016

International Journal of Hydrogen Energy

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A three-dimensional (3D) graphene /Nickel oxide (ERGO/NiO) composite electrodes have been fabricated directly on a Nickel foam substrate via a one-step electrochemical codeposition in an aqueous solution containing Nickel nitrate and GO. By using this simple and one-step electrochemical deposition, it is possible to produce binder-free composite electrodes with improved electrochemical properties using a low-cost, facile and scalable technique. It is observed from FE-SEM images that graphene oxide sheets affect the electrodeposition of nickel oxide. The optimized ErGO/NiO electrode developed in this work exhibits high charge storage capacity with a specific capacitance of 1715.5 F/g at current density 2 A/g and hierarchical morphological structure which facilitates electrolyte diffusion to the electrode surface. A good cycling stability was observed for the modified electrodes in alkaline media. EIS measurements showed low values of internal resistance (Rs) and charge transfer resistance (Rct) for the modified electrodes, indicating that the prepared nanocomposite is appropriate for supercapacitor applications in comparison to NiO/NF electrode.

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“…These techniques, however, require the inclusion of adhesive binders and conducting agents which increase the "dead volume" of the electrode thereby increasing the electrode resistance and reducing redox-active sites. [16][17][18][19] The electrodeposition, on the other hand, poses as a useful method for growing cobalt oxidebased nanostructures directly onto substrates without the need for adhesive binders, presenting the advantages of obtaining increased apparent surface area owing to the resulting nanofeatures. Studies have shown that by adjusting experimental conditions such as electrodeposition mode, precursor electrolyte composition, time, and temperature, materials with desired composition and morphological properties can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Supercapacitor performance evaluation of nanostructured Ag‐decoratedCo‐Co₃O₄composite thin film electrode material

Nuamah

Noormohammed

Sarkar

2022

Intl J of Energy Research

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Summary Nanostructured Ag‐decorated Co‐Co3O4 composite thin film (Ag/Co‐Co3O4) synthesized on nickel foam (NF) by a combination of cyclic voltammetry and pulse reverse potential electrodeposition modes presents higher specific capacitance and its retention. The higher specific capacitance of 2800 F/g on Ag/Co‐Co3O4/NF composite thin film in comparison with 2580 F/g on Co‐Co3O4/NF at 1 A/g is attributable to the presence of nanostructured Ag in the composite film enhancing the ionic and electronic conductivity of the material. The morphology revealed by the scanning electron microscope correlates the electrochemical and capacitance behavior while the energy‐dispersive X‐ray spectroscopy spectra confirmed the presence of Co, Ag, and O in the Ag/Co‐Co3O4/NF composite thin film. The attenuated total reflection‐Fourier transform infrared spectra obtained further confirmed the presence of Co–O bonds. The Ag/Co‐Co3O4/NF composite thin film presented an amorphous nature as revealed by the X‐ray diffraction spectra. In addition, the Ag/Co‐Co3O4/NF electrode exhibited a maximum specific energy of 69.5 Wh/kg, specific power of 6.6 kW/kg and capacitance retention of 82.6% after 1000 cycles, while the Co‐Co3O4 electrode (with no Ag) showed lower specific energy of 60.8 Wh/kg, specific power of 5.8 kW/kg, and a capacitance retention of 78.2% after 1000 cycles. Furthermore, by the incorporation of Ag, the composite electrode showed a reduction in the equivalence series resistance value from 1.5 Ω cm2 (Co‐Co3O4/NF) to 1.0 Ω cm2 (Ag/Co‐Co3O4/NF) as well as in the charge transfer resistance (Rct) from 2.86 Ω cm2 (Co‐Co3O4/NF) to 0.96 Ω cm2 (Ag/Co‐Co3O4/NF) indicating the positive influence of the presence of Ag in the film. The electrochemical evaluation indicates that a synergistic effect between Ag and Co‐Co3O4 enhances supercapacitor electrode performance.

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Electrodeposited reduced-graphene oxide/cobalt oxide electrodes for charge storage applications

Cited by 26 publications

References 41 publications

Specific capacitance behavior of Co‐Co ₃ O ₄ nanocomposite thin films synthesized via different electrodeposition modes

Specific capacitance behavior of Co‐Co ₃ O ₄ nanocomposite thin films synthesized via different electrodeposition modes

One-step fabrication of electrochemically reduced graphene oxide/nickel oxide composite for binder-free supercapacitors

Supercapacitor performance evaluation of nanostructured Ag‐decoratedCo‐Co₃O₄composite thin film electrode material

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Electrodeposited reduced-graphene oxide/cobalt oxide electrodes for charge storage applications

Cited by 26 publications

References 41 publications

Specific capacitance behavior of Co‐Co 3 O 4 nanocomposite thin films synthesized via different electrodeposition modes

Specific capacitance behavior of Co‐Co 3 O 4 nanocomposite thin films synthesized via different electrodeposition modes

One-step fabrication of electrochemically reduced graphene oxide/nickel oxide composite for binder-free supercapacitors

Supercapacitor performance evaluation of nanostructured Ag‐decoratedCo‐Co3O4composite thin film electrode material

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Specific capacitance behavior of Co‐Co ₃ O ₄ nanocomposite thin films synthesized via different electrodeposition modes

Specific capacitance behavior of Co‐Co ₃ O ₄ nanocomposite thin films synthesized via different electrodeposition modes

Supercapacitor performance evaluation of nanostructured Ag‐decoratedCo‐Co₃O₄composite thin film electrode material