scholarly journals Nanoflake Manganese Oxide and Nickel-Manganese Oxide Synthesized by Electrodeposition for Electrochemical Capacitor

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Man Van Tran ◽  
An The Ha ◽  
Phung My Loan Le
Keyword(s):  
Manganese Oxide ◽  
Specific Capacitance ◽  
Deposition Time ◽  
Discharge Rate ◽  
Electrochemical Capacitor ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Structure Morphology ◽  
Highly Porous ◽  
Nickel Manganese

Nanoflake structures of electrochemical manganese oxide (EMD) and nickel mixed manganese oxide (NiMD) were directly deposited on a stainless steel by using Chronoamperometry and Cyclic Voltammetry (CV) techniques. The structure, morphology, and capacitive behavior of EMD or NIMD nanoflake were affected by the electrodeposition modes and deposition time. The highest specific capacitance (Csp) was obtained for only two-minute deposition by both methods. EMD nanoflakes electrodeposited by CV technique show higher specific capacitance values than those prepared by Chronoamperometry owing to its homogenous and highly porous surface. All EMD samples exhibited excellent cycle behavior, less than 5% capacitance loss after 1000 cycles. Ni mixed MnO2was prepared at different Mn2+/Ni2+ratios for 2 minutes of electrodeposition. The presence of Ni2+ion enhanced theCspvalue at high charge-discharge rate due to the decrease of the charge transfer resistance. The supercapacitor prototype of 2 cm × 2 cm was assembled using EMD and NiMD as electrode material and tested at 1 A·g−1.

Morphology-controlled electrochemical capacitive behavior of manganese oxide films

2019 ◽  
Vol 12 (01) ◽  
pp. 1850099 ◽  
Author(s):  
Avtar Singh ◽  
Davinder Kumar ◽  
Anup Thakur ◽  
Raminder Kaur
Keyword(s):  
Manganese Oxide ◽  
Surface Area ◽  
Deposition Time ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Oxide Films ◽  
Electrochemical Capacitor ◽  
Charge Transfer Resistance ◽  
Charge Storage ◽  
Transfer Resistance

This paper reports the effect of surface morphology on the electrochemical performance of electrodeposited manganese oxide films. These films were deposited on stainless steel substrate by chronoamperometry for different deposition time (30[Formula: see text]s, 60[Formula: see text]s, and 120[Formula: see text]s). Morphology of deposited films were studied by scanning electron microscopy and decrease in surface area was observed with variation in deposition time. Cyclic voltammetry revealed decrease in specific capacitance with decrease in surface area of films. This effect was analyzed by electrochemical impedance spectroscopy (EIS) study. Further, the EIS data were fitted with equivalent circuit of electrochemical capacitor electrode and investigating electrolyte ion interaction with electrode during charge storage process. EIS fitted data were analyzed to study the electrode characteristics such as series resistance, double layer charge storage and charge transfer resistance. The variation in these characteristics was due to change in diffusion length with increased deposited electrode material content on substrate.

Facile synthesis of γ-MnO2/rice husk-based-activated carbon and its electrochemical properties

2017 ◽  
Vol 10 (05) ◽  
pp. 1750057 ◽  
Author(s):  
Xiaolan Song ◽  
Hailong Duan ◽  
Ying Zhang ◽  
Haibo Wang ◽  
Hongyun Cao
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
Low Cost ◽  
Chemical Deposition ◽  
Electrochemical Capacitor ◽  
High Specific Capacitance ◽  
Charge Transfer Resistance ◽  
Electrochemical Performances ◽  
Equivalent Series Resistance ◽  
Transfer Resistance

In this study, composite [Formula: see text]-MnO2/activated carbon (AC) was prepared by chemical deposition method, and then it was assembled into electrode and electrochemical capacitor. Effects of reaction temperature and MnO2 content were studied. Materials were characterized by X-ray diffraction, scanning electron microscope and electrochemical test. MnO2 prepared at 30[Formula: see text]C was amorphous, and it displayed the high specific capacitance as nearly four times as MnO2 at 80[Formula: see text]C. Due to MnO2 particles which would block carbon pores when its content was too high, the composite containing 30% of MnO2 exhibited the largest specific capacitance of 278.3[Formula: see text]F/g at 0.2[Formula: see text]A/g in K2SO4 electrolyte. The equivalent series resistance and charge transfer resistance of material were only 1.35[Formula: see text][Formula: see text] and 1.41[Formula: see text][Formula: see text], respectively. After 1000 cycles, the capacitance retention was still 91.6%. It indicated that chemical deposition was a facile, low cost and effective method to prepare MnO2/AC with good electrochemical performances.

Facile Preparation of NiO/Ni Nanocomposite and its Electrochemical Capacitive Behaviors

2011 ◽  
Vol 306-307 ◽  
pp. 134-138 ◽  
Author(s):  
Wei Dong Yin ◽  
Gui Lian Li ◽  
Xian Ming Liu
Keyword(s):  
Specific Capacitance ◽  
Oxidation Process ◽  
Aqueous Electrolyte ◽  
High Specific Capacitance ◽  
Cycling Performance ◽  
Charge Transfer Resistance ◽  
Electrochemical Performances ◽  
Composite Electrodes ◽  
Galvanostatic Charge ◽  
Transfer Resistance

NiO/Ni nanocomposites were prepared by chemically reduction-oxidation process in tetra-ethylene glycol (TEG) solution. The structure and morphology of the samples were examined by XRD and SEM. The results indicated the composite consisted of NiO and Ni and exhibited spherical morphology with diameter of 50-200 nm. The electrochemical performances of composite electrodes used in electrochemical capacitors were studied. The electrochemical measurements were carried out using cyclic voltammetry, galvanostatic charge/discharge and impedance spectroscopy in 6M KOH aqueous electrolyte using three-electrode Swagelok systems. The results showed that the composite had a high specific capacitance and excellent capacitive behavior. The specific capacitance of the composite decreased to 192F/g after 500 cycles. Due to the existance of Ni, the charge transfer resistance is lower than 1Ω. It revealed that the composite exhibited good cycling performance.

scholarly journals Facilely Synthesized NiCo2O4/NiCo2O4 Nanofile Arrays Supported on Nickel Foam by a Hydrothermal Method and Their Excellent Performance for High-Rate Supercapacitance

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1308 ◽  
Author(s):  
Anil Yedluri ◽  
Eswar Araveeti ◽  
Hee-Je Kim
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Nickel Foam ◽  
Rate Capability ◽  
Charge Transfer Resistance ◽  
High Rate ◽  
Transfer Resistance ◽  
Electrons And Ions ◽  
Binary Metal Oxides ◽  
Hydrothermal Approach

NiCo2O4 nanoleaf arrays (NCO NLAs) and NiCo2O4/NiCO2O4 nanofile arrays (NCO/NCO NFAs) material was fabricated on flexible nickel foam (NF) using a facile hydrothermal approach. The electrochemical performance, including the specific capacitance, charge/discharge cycles, and lifecycle of the material after the hydrothermal treatment, was assessed. The morphological and structural behaviors of the NF@NCO NLAs and NF@NCO/NCO NFAs electrodes were analyzed using a range of analysis techniques. The as-obtained nanocomposite of the NF@NCO/NCO NFAs material delivered outstanding electrochemical performance, including an ultrahigh specific capacitance (Cs) of 2312 F g−1 at a current density of 2 mA cm−2, along with excellent cycling stability (98.7% capacitance retention after 5000 cycles at 5 mA cm−2). These values were higher than those of NF@NCO NLAs (Cs of 1950 F g−1 and 96.3% retention). The enhanced specific capacitance was attributed to the large electrochemical surface area, which allows for higher electrical conductivity and rapid transport between the electrons and ions as well as a much lower charge-transfer resistance and superior rate capability. These results clearly show that a combination of two types of binary metal oxides could be favorable for improving electrochemical performance and is expected to play a major role in the future development of nanofile-like composites (NF@NCO/NCO NFAs) for supercapacitor applications.

Pulse Polymerized Poly(3,4-ethylenedioxythiophene) Electrodes For Solid-State Supercapacitors with Ionic Liquid Gel Polymer Electrolyte

2012 ◽  
Vol 1448 ◽  
Author(s):  
G. P. Pandey ◽  
A. C. Rastogi
Keyword(s):  
Ionic Liquid ◽  
Solid State ◽  
Polymer Electrolyte ◽  
Photoelectron Spectroscopy ◽  
Gel Polymer Electrolyte ◽  
Charge Transfer Resistance ◽  
Polymer Chains ◽  
Transfer Resistance ◽  
Spectroscopy Studies ◽  
Highly Porous

ABSTRACTPoly(3,4-ethylenedioxythiophene) (PEDOT) electrodes are prepared by a novel ultrashort galvanic pulse electropolymerization technique for application in solid-state supercapacitors. Microstructure studies using scanning electron microscopy (SEM) show that PEDOT electrodes deposited by pulse polymerization are highly porous as compared to the conventional potentiostatic polymerization. In addition, as revealed by the X-ray photoelectron spectroscopy (XPS) studies in the PEDOT films formed by pulse polymerization, the polymer chains are fully conjugated with the dopant ClO4- ions. Solid-state supercapacitor cells using pulse polymerized PEDOT electrodes and ionic liquid gel polymer electrolyte were fabricated and characterized. The impedance spectroscopy studies show that the pulse polymerized PEDOT electrode have specific capacitance value of ∼ 65 F g-1 as compared to ∼52 F g-1for potentiostatically polymerized PEDOT and significantly lower interfacial and charge transfer resistance. Cyclic voltammetry (CV) and galvanostatic charge-discharge characterization show highly capacitive behavior of the supercapacitor cells in the solid-state configuration.

Effect of dip time on the electrochemical behavior of PPy-Cu(OH)2 hybrid electrodes synthesized using pyrrole and CuSO4

e-Polymers ◽  
2017 ◽  
Vol 17 (2) ◽  
pp. 167-173 ◽  
Author(s):  
Amarsingh V. Thakur ◽  
Balkrishna J. Lokhande
Keyword(s):  
Specific Capacitance ◽  
Electrochemical Behavior ◽  
Charge Transfer Resistance ◽  
Specific Power ◽  
Data Card ◽  
Sem Images ◽  
Transfer Resistance ◽  
X Ray ◽  
Hybrid Energy ◽  
Warburg Impedance

AbstractThe present work in on the successive ionic layer adsorption and reaction (SILAR) mediated synthesis and study of variations in electrochemical behavior of PPy-Cu(OH)2 hybrid electrodes with dip time. In the aqueous route preparation, 0.1 m pyrrole, 0.1 m CuSO4 dissolved in acidified water (using 0.5 m H2SO4) and H2O2 (30 wt %) were used as initial ingredient sources. The peaks observed in the X-Ray diffraction (XRD) pattern of the electrode at 2θ=21.500 oriented along the <110> planes closely match with the peaks of Cu(OH)2 as per JCPDS data card no. 42-0638 indicating the existence of triclinic Cu(OH)2 in the hybrid. The characteristic peak at 1559 cm−1 in the Fourier transform infrared (FTIR) spectrum due to pyrrole ring vibrations confirms the existence of PPy in the hybrid. Energy-dispersive X-ray (EDX) analysis shows the occurrence of C, N, O and Cu in the electrode material which substantiates the formation of the hybrid. The scanning electron microscopy (SEM) images of electrodes with optimum dip time (20 s) in pyrrole show networks of interconnected nanostructures. The specific capacitance increases with the dip time in the source solutions. The electrode prepared with optimum dip time in pyrrole has produced the maximum values of specific capacitance (SC), specific energy (SE) and specific power (SP) as 127.04 F/g, 44.16 Wh/kg and 30 kW/kg, respectively, when analyzed in 0.5 m H2SO4. Impedance study of the electrode explains the mixed capacitive nature and the maximum values of solution resistance (Rs), charge transfer resistance (Rct) and Warburg impedance (Rw) are 1.35 Ω, 143.4 Ω and 2.05 Ω, respectively.

scholarly journals STUDY OF STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF 3-D MICROFLOWER-LIKE NICKEL HYDROXIDE

2021 ◽  
pp. 17-18
Author(s):  
D.B. Mane ◽  
L.D. Kadam ◽  
R.V. Dhekale ◽  
G. M. Lohar
Keyword(s):  
Nickel Hydroxide ◽  
Room Temperature ◽  
Deposition Time ◽  
Charge Transfer Resistance ◽  
Hexagonal Crystal ◽  
Galvanostatic Charge ◽  
Transfer Resistance ◽  
Ft Ir ◽  
Eis Analysis ◽  
Energy And Power Density

Recent work reported on nickel hydroxide chemically synthesized by simple cast effective chemical bath deposition method at room temperature. During reaction, nanoflakes developed and time enhance nanoflakes interlinked to form marigold like microflower which reveals from SEM. Structural properties analysis by XRD and FT-IR gives hexagonal crystal structure and presence of Ni-O bond to confirmation of deposition of Ni(OH) material. Highest value of specific 2 -1 capacitance of electrode at deposition time 90 min without aniline from Cyclic voltammetry is 553 Fg at scan rate 10 mV -1 -1 -2 -1 -1 s and from Galvanostatic charge discharge 215 Fg at current density 3 mA cm with 6.04 W h kg and 1687.5 W kg of energy and power density respectively. EIS analysis reveals least charge transfer resistance of 90min deposition time electrode.

scholarly journals STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF CHEMICALLY DEPOSITED COPPER DOPED NICKEL HYDROXIDE

2021 ◽  
pp. 90-91
Author(s):  
D.B. Mane ◽  
L.D. Kadam ◽  
R.V. Dhekale ◽  
G. M. Lohar
Keyword(s):  
Specific Capacitance ◽  
Xrd Analysis ◽  
Charge Transfer Resistance ◽  
Stainless Steel Electrode ◽  
Hexagonal Crystal Structure ◽  
Hexagonal Crystal ◽  
Transfer Resistance ◽  
Steel Electrode ◽  
Ft Ir ◽  
Ir Study

Present work reported, copper doped Ni(OH) deposited successfully by chemical bath deposition method on 2 economical stainless steel electrode. The XRD analysis represent hexagonal crystal structure and presence of Ni and Cu confirm by FT-IR study. The surface morphology studied by SEM indicates nanopetals linked marigold like microflowers. -1 -1 The 0.2% Cu doped Ni(OH)2 shows specific capacitance 715 Fg at scan rate 10 mV s . EIS study interprets that electrode N-0.2% have least charge transfer resistance which improve value of specific capacitance. All results revels cupper is good dopant for improve the specific capacitance.

Preparation and electrochemical characterization of PANI/MnCo2O4 nanocomposite as supercapacitor electrode material

2018 ◽  
Vol 96 (5) ◽  
pp. 477-483 ◽  
Author(s):  
Saeid Panahi ◽  
Moosa Es’haghi
Keyword(s):  
Specific Capacitance ◽  
Surface Characterization ◽  
Electrochemical Impedance ◽  
Rate Capability ◽  
Cycling Performance ◽  
Charge Transfer Resistance ◽  
X Ray Diffraction ◽  
Supercapacitor Electrode ◽  
Transfer Resistance

In this work, PANI/MnCo2O4 nanocomposite was prepared via in-situ chemical polymerization method. Materials synthesized were characterized by FTIR spectroscopy, X-ray diffraction, and scanning electron spectroscopy. In addition, surface characterization of samples such as specific surface area, pore volume, and pore size distribution was studied. Supercapacitor capability of materials was investigated in 1 mol L–1 Na2SO4 solution using cyclic voltammetry in different potential scan rates and electrochemical impedance spectroscopy (EIS). The specific capacitance of materials was calculated, and it was observed that the specific capacitance of PANI/MnCo2O4 nanocomposite was 185 F g−1, much larger than PANI. Moreover, the prepared nanocomposite exhibited better rate capability in scan rate of 100 mV s−1 with respect to PANI. The EIS experiments revealed that the nanocomposite has lower charge transfer resistance compared with pure PANI. Subsequently, it was shown that the nanocomposite cycling performance was superior to the PANI cycling performance.

Electrodeposition of Manganese Oxide Nanosheets as Supercapacitor Electrode Materials

2016 ◽  
Vol 675-676 ◽  
pp. 273-276 ◽  
Author(s):  
Tuntumrong Wanchaem ◽  
Songsak Rattanamai ◽  
Paweena Dulyaseree ◽  
Wirat Jarernboon ◽  
Winadda Wongwiriyapan
Keyword(s):  
Thin Films ◽  
Manganese Oxide ◽  
Specific Capacitance ◽  
Deposition Time ◽  
Electrode Materials ◽  
Constant Current ◽  
Manganese Sulfate ◽  
Supercapacitor Electrode ◽  
Supercapacitor Electrode Materials ◽  
Ss 304

Manganese oxide (MnOx) thin films were prepared on stainless steel (SS) 304 by galvanostatic (GS) mode of electrodeposition technique using different precursors; 0.1 M potassium permanganate (KMnO4) and 0.1 M manganese sulfate (MnSO4) solutions. The electrodeposition condition was set at a constant current of 1 mA/cm2. Different precursors provide MnOx thin films with different morphologies. Using KMnO4 as a precursor, the MnOx thin film was deposited (MnOx-K), while using MnSO4 as a precursor, the MnOx nanosheets with a thickness of approximately 40 nm were formed (MnOx-S). XPS results evidence the formation of manganese oxide with different oxidation states composition by different precursors. Electrochemical measurements were carried out in a three-electrode setup using Pt and Ag/AgCl electrodes as counting and reference electrodes, respectively and 1M Na2SO4 aqueous solution as electrolyte. MnOx-K at a deposition time of 10 min shows the highest specific capacitance of 233.55±19.01 F/g. The specific capacitance improvement of MnOx-K may be attributed to MnOx nanosheet structure which increases surface area of electrode.

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