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.

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.

Inhibitive Performance of 1,4/1,6-Bis(α-Alkyl Pyridinium ) Butane/Hexane Dibromide on A3 Steel

2011 ◽  
Vol 339 ◽  
pp. 96-102
Author(s):  
Xiao Hui Jiang ◽  
Li Mei Zhou ◽  
Shan Zhuo Yao ◽  
Ming Duan ◽  
Xing Qi Hu
Keyword(s):  
Self Assembly ◽  
Gemini Surfactants ◽  
Alkyl Chain ◽  
Charge Transfer Resistance ◽  
Inhibition Rate ◽  
Gravimetric Measurement ◽  
Transfer Resistance ◽  
Alkyl Chains ◽  
Ft Ir ◽  
Positively Charged

1,6-bis(α-alkyl pyridinium ) hexane dibromide was synthesized and confirmed by 1H NMR, 13C NMR, FT-IR and MS. The inhibitive effect of the gemini surfactants for A3 steel in 20% hydrochloric acid was evaluated by gravimetric measurement and electrochemical method. The results indicated that the inhibitive efficiency of the gemini surfactants was affected by the concentration, the length of alkyl chain and spacer in the gemini surfactants. The inhibition rate increased with concentration, the surfactants with four methylenes as spacer showed a slightly better anticorrosive performance than those with six methylenes, and the gemini surfactants with decyl chains exhibited the best inhibitive efficiency. The adsorption of these gemini surfactants on the surface of A3 steel was in accordance with Langmuir isotherm. The electrochemical experiment revealed that the gemini surfactants were mix-type inhibitors. The current density decreased noticeably with the concentration while the charge-transfer resistance increased. The pyridinium rings and positively charged nitrogen atoms in the gemini molecule adsorbed on A3 steel surface and the alkyl chains formed a hydrophobic layer by virtue of self-assembly property of surfactants. Therefore the corrosion of A3 steel was effectively inhibited by the gemini surfactants.

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.

Study on the Performance of Amorphous Nickel Hydroxide Codoped with Ce and Fe

2011 ◽  
Vol 694 ◽  
pp. 718-722
Author(s):  
Chang Jiu Liu ◽  
Chun Xiao Xing ◽  
Shi Juan Chen
Keyword(s):  
Nickel Hydroxide ◽  
Electrochemical Impedance ◽  
Chemical Precipitation ◽  
Charge Transfer Resistance ◽  
Structural Defects ◽  
Rapid Freezing ◽  
Transfer Resistance ◽  
Freezing Method ◽  
Electrochemical Reversibility ◽  
Charge Discharge

Amorphous nickel hydroxide powders codoped with Ce and Fe were synthesized by the combined chemical precipitation and rapid freezing method. The microstructure and chemical composition of the samples was characterized by XRD,SAED and EDS. The electrochemical performance of the prepared samples was analyzed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge-discharge tests. The results showed that this amorphous nickel hydroxide codoped with Ce and Fe had more structural defects than those of Fe singly doped amorphous nickel hydroxide. These abundant structural defects with Ce and Fe codoped amorphous nickel hydroxide increased the thermal stability, decreased the charge transfer resistance, inhibited oxygen evolution reaction effectively and improved the electrochemical reversibility of the amorphous nickel hydroxide electrode.

Polyaniline Binder for Functionalized Acetylene Black: A Hybrid Material for Supercapacitor

2014 ◽  
Vol 1024 ◽  
pp. 327-330
Author(s):  
Singh Ajit ◽  
Srinivasan Palaniappan ◽  
S. Gopukumar
Keyword(s):  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
Acetylene Black ◽  
Transfer Resistance ◽  
Bonding Effect ◽  
Ft Ir ◽  
Xps Study ◽  
Low Charge ◽  
Electrochemical Impedance Spectroscopic ◽  
Thermal Stability Of

Polyaniline-doped with functionalyzed acetylene black material has been successfully synthesized and used as an electrode material in supercapacitor, wherein, this material contributes both pseudocapacitative (PC) and electrical double layer capacitative (EDLC) behaviour. Functionalization of acetylene black (AB) has been carried out and used as dopant for THF soluble polyaniline base (PANI) to prepare PANI-functionalized acetylene black (PANI-FAB). Formation of FAB and PANI-FAB was confirmed with the help of FT-IR and XPS study. Functionalization of AB results in agglomerated FAB and doping with PANI results in agglomerated fibrous PANI-FAB, as compared to fibrous AB. High thermal stability of AB decreases on functionalization and again slightly increases for PANI-FAB. Functionalization of AB also results good bonding effect with PANI, where PANI acts as both PC and binder, instead of the higher amounts of binder (PVdF > 30 wt%) that are normally needed to hold AB. Electrochemical studies of FAB and PANI-FAB materials were carried out by cyclic voltammetric and electrochemical impedance spectroscopic methods. PANI-FAB supercapacitor cell shows capacitance of 132 Fg1for 0.3 Ag1current density with very low charge-transfer resistance and low time constant.

Electrochemical Properties of Electrodeposited MnO2 Nanoparticles

2015 ◽  
Vol 1113 ◽  
pp. 550-553 ◽  
Author(s):  
Gomaa Abdelgawad Mohammed Ali ◽  
Mashitah M. Yusoff ◽  
Kwok Feng Chong
Keyword(s):  
Electrochemical Properties ◽  
High Specific Capacitance ◽  
Xrd Analysis ◽  
Charge Transfer Resistance ◽  
Electrochemical Studies ◽  
Galvanostatic Charge ◽  
Transfer Resistance ◽  
Electrodeposited Film ◽  
Solution Resistance ◽  
Charge Discharge

The present study shows the electrodeposition of MnO2 from KMnO2 solution and its electrochemical studies. XRD analysis shows the electrodeposited MnO2 has nano-sized particle of 18 nm. The electrochemical properties have been investigated using the cyclic voltammetry, galvanostatic charge/discharge and impedance techniques. The electrodeposited MnO2 shows good electrochemical behavior with high specific capacitance value of ca. 306 F g-1. Moreover, it shows high capacitance stability of 90% over 1000 charge/discharge cycles. Impedance result shows low solution resistance and charge transfer resistance, an indication of the conductive nature for the electrodeposited film.

scholarly journals Influence of Fe and Ni Doped CuO Nanomaterials for High Performance Supercapacitors

2020 ◽  
Vol 32 (11) ◽  
pp. 2763-2772
Author(s):  
Palanisamy Revathi ◽  
Venkatachalam Ma nikandan ◽  
Panneerselvam Ezhilmathi ◽  
Veerasamy Uma Shankar ◽  
Palani Suganya ◽  
...  
Keyword(s):  
High Performance ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Charge Transfer Resistance ◽  
Cyclic Voltammograms ◽  
Transfer Resistance ◽  
Galvanostatic Discharge ◽  
Low Charge ◽  
Supercapacitor Applications ◽  
Eis Analysis

This paper focuses on the synthesis of doped and undoped CuO nanoparticles using the sol-gel method, which has been prepared and described. Supercapacitor applications of as-synthesized nanomaterials were analyzed using cyclic voltammetry (CV), galvanostatic discharge (GCD) and electrochemical impedance spectroscopic (EIS) analysis. The cyclic voltammograms illustrated the quasi-rectangular shape which depicted the pseudocapacitance nature of the samples. The calculated specific capacitance of the prepared samples was 180, 253 and 303 (F/g) corresponding to CuO, Fe-CuO and Ni-CuO, respectively at the low current density and the EIS spectra show that the prepared Ni-CuO electrode exhibits low charge transfer resistance.

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.

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