Cathodic electrodeposition and electrochemical response of manganese oxide pseudocapacitor electrodes

Consecutive layers of Ni(OH)2 and Co(OH)2 were electrodeposited on stainless steel current collectors for preparing charge storage electrodes of high specific capacity with potential application in hybrid supercapacitors. Different electrodes were prepared consisting on films of Ni(OH)2, Co(OH)2, Ni1/2Co1/2(OH)2 and layered films of Ni(OH)2 on Co(OH)2 and Co(OH)2 on Ni(OH)2 to highlight the advantages of the new architecture. The microscopy studies revealed the formation of nanosheets in the Co(OH)2 films and of particles agglomerates in the Ni(OH)2 films. Important morphological changes were observed in the double hydroxides films and layered films. Film growth by electrodeposition was governed by instantaneous nucleation mechanism. The new architecture composed of Ni(OH)2 on Co(OH)2 displayed a redox response characterized by the presence of two peaks in the cyclic voltammograms, arising from redox reactions of the metallic species present in the layered film. These electrodes revealed a specific capacity of 762 C g−1 at the specific current of 1 A g−1. The hybrid cell using Ni(OH)2 on Co(OH)2 as positive electrode and carbon nanofoam paper as negative electrode display specific energies of 101.3 W h g−1 and 37.8 W h g−1 at specific powers of 0.2 W g−1 and 2.45 W g−1, respectively.

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“…The specific capacity ( Q /C g −1 ) and capacitance ( C /F g −1 ) of the films was calculated from the GCD curves using the formula40:…”

Section: Methodsmentioning

confidence: 99%

Layered Ni(OH)2-Co(OH)2 films prepared by electrodeposition as charge storage electrodes for hybrid supercapacitors

Nguyen¹,

Boudard²,

Carmezim³

et al. 2017

Sci Rep

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134

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“…Figure shows the XRD pattern of the electrodeposited MnO 2 on FTO glass electrode. The characteristic peaks of MnO 2 observed at 2 θ = 37.6°, 61.4°, and 65.4° in the XRD pattern confirm the formation of α‐MnO 2 with planes of (2 1 1), (5 2 1), and (0 0 2) respectively (JCPDS NO.44‐0141) …”

Section: Resultsmentioning

confidence: 67%

“…It is known that the α‐MnO 2 exhibits a good thermal stability at high temperatures . It may be further noted that, among all forms, the α, β, and γ‐MnO 2 is the preferred structure as electrode material for electrochemical applications …”

Section: Resultsmentioning

confidence: 99%

“…MnO 2 has been prepared by various approaches, such as co‐precipitation, pyrogenation, sol–gel, mechanical grinding, hydrothermal synthesis, and chemical bath deposition. However, most of these techniques result in the powder form of MnO 2 which brings in more complicacy and is inconvenient for electrode fabrications . One of the easier methods for the preparation of MnO 2 electrodes is electrodeposition as it leads to a direct deposition of oxide films on an electrode.…”

Section: Introductionmentioning

confidence: 99%

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Counter Electrode in Polymer‐Electrolyte‐Based DSSC: Platinum Versus Electrodeposited MnO₂

Kakroo

Suran

Bhattachary

2019

Macromolecular Symposia

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Manganese oxide have been successfully electrodeposited on fluorine-doped tin oxide glass electrodes via a facile, green, and energy-efficient electrodeposition technique, which is used as counter electrode in a dye-sensitized solar cell using polyethylene-oxide-based solid polymer electrolyte. X-ray diffraction, energy dispersive X-ray, and scanning electron microscopy are used to study the structure, elemental composition, and surface morphology of the electrodeposited electrode. The electrochemical performance of the electrode is studied by cyclic voltammetry and electrochemical impedance spectroscopy. Performance of the cells is investigated by photocurrent-voltage characteristics using an input power (P in ) of 100 mW cm −2 . The short-circuit current density (J sc ) is 0.22 mA cm −2 , open-circuit voltage (V oc ) is 0.76 V, fill factor (FF) is 0.5, and power conversion efficiency ( ) is 0.08%. Further, a comparison with the conventional platinum (Pt) counter electrode is made and presented in this paper.

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“…In Fig. 7a-f, it is observed that the current is directly proportional to the scan rates of CV, as when the scan rate increases, the current also increases (Nguyen et al 2015). This may be due to the higher response of redox peak in all the nanofibres.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 81%

Structural morphology and electronic conductivity of blended Nafion®-polyacrylonitrile/zirconium phosphate nanofibres

Sigwadi

Dhlamini

Mokrani

et al. 2019

Int J Mech Mater Eng

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This paper aimed to study the influence of zirconium phosphate (ZrP) nanoparticles on reducing the diameter of nanofibres during electrospinning. Addition of metal oxide such as zirconium phosphate decreases the diameter and smooths on the polyacrylonitrile (PAN) nanofibres as observed by the SEM techniques. Furthermore, this work investigated the effect of zirconium phosphate on the morphology and conductivity of modified PAN nanofibres under SEM, XRD and electrochemical cells. The PAN/zirconium phosphate nanofibres were obtained with the diameter ranges between 100 and 200 nm, which mean that the nanofibres morphology significantly changed with the addition of the zirconium phosphate nanoparticles. The conductivity of PAN and PAN-Nafion zirconium phosphate nanofibres was more improved when compared to that of the plain PAN nanofibres as observed under electrochemical measurements. The plain PAN nanofibres show the total degradation on thermal gravimetric analysis results when compared to the modified PAN with zirconium phosphate nanoparticles. The thermal properties and proton conductivity make the PAN/ZrP nanofibres as promising nanofillers for fuel cell electrolytes.

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Cathodic electrodeposition and electrochemical response of manganese oxide pseudocapacitor electrodes

Cited by 26 publications

References 45 publications

Layered Ni(OH)2-Co(OH)2 films prepared by electrodeposition as charge storage electrodes for hybrid supercapacitors

Layered Ni(OH)2-Co(OH)2 films prepared by electrodeposition as charge storage electrodes for hybrid supercapacitors

Counter Electrode in Polymer‐Electrolyte‐Based DSSC: Platinum Versus Electrodeposited MnO₂

Structural morphology and electronic conductivity of blended Nafion®-polyacrylonitrile/zirconium phosphate nanofibres

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Cathodic electrodeposition and electrochemical response of manganese oxide pseudocapacitor electrodes

Cited by 26 publications

References 45 publications

Layered Ni(OH)2-Co(OH)2 films prepared by electrodeposition as charge storage electrodes for hybrid supercapacitors

Layered Ni(OH)2-Co(OH)2 films prepared by electrodeposition as charge storage electrodes for hybrid supercapacitors

Counter Electrode in Polymer‐Electrolyte‐Based DSSC: Platinum Versus Electrodeposited MnO2

Structural morphology and electronic conductivity of blended Nafion®-polyacrylonitrile/zirconium phosphate nanofibres

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Counter Electrode in Polymer‐Electrolyte‐Based DSSC: Platinum Versus Electrodeposited MnO₂