scholarly journals Development and Characterization of SDS Doped Poly(aniline-co-2-isopropylaniline) MWCNT/CuO Nanocomposites for Electrochemical Supercapacitor Application

2020 ◽  
Vol 32 (7) ◽  
pp. 1779-1787
Author(s):  
Kamal Kant Singh ◽  
Ashok K. Sharma
Keyword(s):  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
Sweep Rate ◽  
Redox Activity ◽  
Multiwalled Carbon ◽  
Supercapacitor Application ◽  
Electrode Cell ◽  
Cyclic Voltammetric Studies ◽  
Physical And Chemical ◽  
Maximum Specific Capacitance

A novel electroactive nanocomposite material containing aniline-co-2-isopropylaniline (Pani-co), SDS doped poly-Pani-co, copper oxide (CuO), and multiwalled carbon nanotubes (MWCNTs) has been developed by in situ oxidative synthesis technique. The electrochemical execution of synthesised composite as electroactive supercapacitor material was examined through three electrode cell assembly viz. cyclic voltammetry (CV), galvanostatic charge/discharge analysis (GCD) and electrochemical impedance study. Physical and chemical characteristics of synthesized SDS doped Pani-co/MWCNT/ CuO nanocomposite were explored via FTIR, TGA, XRD, FESEM and EDX methods. The results confirmed that the existence of metal oxide on MWCNTs enhanced the redox activity of the prepared composite. The maximum specific capacitance obtained in cyclic voltammetric studies was 1473 F/g at sweep rate of 3mV/s, and the maximum specific capacitance obtained with GCD studies was 1512 F/g at current density of 1A/g in 1M Na2SO4 aqueous solution of with better cycle life.

Effects of Deposition Temperatures on the Nanoflakes Co(OH)2 Porous Films for Supercapacitors

2011 ◽  
Vol 694 ◽  
pp. 214-218
Author(s):  
Zhan Jun Yu ◽  
Bin Bin Wang ◽  
Rong Bao Liao ◽  
Yu Min Cui
Keyword(s):  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
High Specific Capacitance ◽  
Electrochemical Technique ◽  
Porous Films ◽  
Discharge Current Density ◽  
A Charge ◽  
Maximum Specific Capacitance ◽  
Charge Discharge

Nanoflakes Co(OH)2 porous films were successfully synthesized by a facile electrochemical technique. The morphology was characterized by field emission scanning electron microscopy (FESEM). Electrochemical techniques such as cyclic voltammetry (CV), galvanostaitc charge/discharge and electrochemical impedance spectroscopy were used to study the effects of deposition temperatures on the capacitance of the films. The results exhibited that the Co(OH)2 films single electrode had high specific capacitance in KOH electrolyte. A maximum specific capacitance of 2780 F/g could be achieved for the Co(OH)2 film deposited at 50°C in 2 M aqueous KOH with 0 to 0.4V potential at a charge-discharge current density of 4 mA/cm2. Therefore, the obtained nanoflakes Co(OH)2 porous films can be a potential application electrode material for supercapacitors.

scholarly journals A Study of Methylcellulose Based Polymer Electrolyte Impregnated with Potassium Ion Conducting Carrier: Impedance, EEC Modeling, FTIR, Dielectric, and Device Characteristics

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4859
Author(s):  
Muaffaq M. Nofal ◽  
Jihad M. Hadi ◽  
Shujahadeen B. Aziz ◽  
Mohamad A. Brza ◽  
Ahmad S. F. M. Asnawi ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Double Layer ◽  
Electrochemical Impedance ◽  
Low Frequency ◽  
Linear Sweep Voltammetry ◽  
High Specific Capacitance ◽  
Transference Number ◽  
Sweep Rate ◽  
Electrochemical Characteristics ◽  
Ion Conducting

In this research, a biopolymer-based electrolyte system involving methylcellulose (MC) as a host polymeric material and potassium iodide (KI) salt as the ionic source was prepared by solution cast technique. The electrolyte with the highest conductivity was used for device application of electrochemical double-layer capacitor (EDLC) with high specific capacitance. The electrical, structural, and electrochemical characteristics of the electrolyte systems were investigated using various techniques. According to electrochemical impedance spectroscopy (EIS), the bulk resistance (Rb) decreased from 3.3 × 105 to 8 × 102 Ω with the increase of salt concentration from 10 wt % to 40 wt % and the ionic conductivity was found to be 1.93 ×10−5 S/cm. The dielectric analysis further verified the conductivity trends. Low-frequency regions showed high dielectric constant, ε′ and loss, ε″ values. The polymer-salt complexation between (MC) and (KI) was shown through a Fourier transformed infrared spectroscopy (FTIR) studies. The analysis of transference number measurement (TNM) supported ions were predominantly responsible for the transport process in the MC-KI electrolyte. The highest conducting sample was observed to be electrochemically constant as the potential was swept linearly up to 1.8 V using linear sweep voltammetry (LSV). The cyclic voltammetry (CV) profile reveals the absence of a redox peak, indicating the presence of a charge double-layer between the surface of activated carbon electrodes and electrolytes. The maximum specific capacitance, Cs value was obtained as 118.4 F/g at the sweep rate of 10 mV/s.

Synthesis and Characterization of Nanoflakes β-Ni(OH)2 Microspheres for Supercapacitors

2011 ◽  
Vol 230-232 ◽  
pp. 306-309 ◽  
Author(s):  
Zhan Jun Yu ◽  
Ying Dai ◽  
Wen Chen
Keyword(s):  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
High Specific Capacitance ◽  
X Ray Diffraction ◽  
Discharge Current Density ◽  
X Ray ◽  
A Charge ◽  
Maximum Specific Capacitance ◽  
Charge Discharge

Nanoflakes β-Ni(OH)2microspheres were successfully synthesized by a facile hydrothermal. The microstructures and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrochemical properties studies were carried out using cyclic voltammetry (CV), galvanostaitc charge/discharge and electrochemical impedance spectroscopy methods, respectively. The results exhibited that the β-Ni(OH)2single electrode had high specific capacitance in KOH electrolyte. A maximum specific capacitance of 1929 F/g could be achieved in 6 M aqueous KOH with 0 to 0.4 V potential at a charge-discharge current density of 6 mA/cm2. Therefore, the obtained nanoflakes β-Ni(OH)2microspheres can be a potential application electrode material for supercapacitors.

Application of MoS2 Nanoflakes in Supercapacitor

2013 ◽  
Vol 773 ◽  
pp. 524-529
Author(s):  
Xue Song Han ◽  
Xun Yong Jiang ◽  
Shou Gen Yin
Keyword(s):  
Cyclic Voltammetry ◽  
Specific Capacitance ◽  
Freeze Drying ◽  
Aqueous Electrolyte ◽  
Electrochemical Impedance ◽  
Cycle Performance ◽  
High Power Density ◽  
Drying Method ◽  
Long Cycle Life ◽  
Maximum Specific Capacitance

In this paper, MoS2 nanoflakes was prepared by a vacuum freeze-drying method. Electrochemical performance of MoS2 nanoflakes has been investigated through cyclic voltammetry, electrochemical impedance spectroscopy analyzer. The results demonstrated that the new electrode maintains a relatively high power density and a good cycle performance in 6 M KOH electrolyte. A maximum specific capacitance of 0.11 F g-1 in an aqueous electrolyte solution has been obtained. The supercapacitor devices exhibit excellent long cycle life along with ~ 40% specific capacitance retained after 500 cycle at scan rates of 500 mV s1.

UNUSUAL ELECTROCHEMICAL RESPONSE OF ELECTROCHEMICAL ETCHING ON MULTIWALLED CARBON NANOTUBES

NANO ◽  
2008 ◽  
Vol 03 (06) ◽  
pp. 461-467 ◽  
Author(s):  
JIAN-SHAN YE ◽  
GUANGQUAN MO ◽  
WEI DE ZHANG ◽  
XIAO LIU ◽  
FWU-SHAN SHEU
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Electrochemical Impedance ◽  
Electrochemical Etching ◽  
Current Response ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Oxidation Of Glucose ◽  
Total Disappearance ◽  
Electrocatalytic Effects

Multiwalled carbon nanotubes (MWNTs) can be etched at potentials more positive than 1.7 V versus Ag / AgCl (3 M KCl ) in 0.2 M HNO 3. The electrochemically etched MWNTs show an increase in electrochemical impedance and sluggish electron transfer kinetics, and lose the electrocatalytic effects toward the oxidation of glucose, H 2 O 2, uric acid (UA) and L-ascorbic acid (L-AA). Transmission electron microscope (TEM) images reveal that the nanotube tips are cut off by electrochemical oxidation. This may lead to the degradation of electrocatalytic ability in the MWNTs. Furthermore, the current response after different electrochemically etched cycles shows that the electrocatalytic ability of the MWNTs toward different molecules can be tuned by etched cycles. For example, five etched cycles leads to the total disappearance of the oxidative response to L-AA, with the remaining over 50% of the UA current response in the L-AA and UA mixture. Thus, electrochemical etching is a simple yet novel way to tune the electrocatalytic reactivity and improve the selectivity of the MWNTs.

scholarly journals Electrochemical DNA Sensor Based on Carbon Black—Poly(Neutral Red) Composite for Detection of Oxidative DNA Damage

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3489 ◽  
Author(s):  
Yurii Kuzin ◽  
Dominika Kappo ◽  
Anna Porfireva ◽  
Dmitry Shurpik ◽  
Ivan Stoikov ◽  
...  
Keyword(s):  
Carbon Black ◽  
Oxidative Dna Damage ◽  
Electrochemical Impedance ◽  
Neutral Red ◽  
Redox Activity ◽  
Antitumor Drugs ◽  
Oxygen Species ◽  
Dna Sensor ◽  
Electrochemical Dna Sensor ◽  
Polymeric Dye

Voltammetric DNA sensor has been proposed on the platform of glassy carbon electrode covered with carbon black with adsorbed pillar[5]arene molecules. Electropolymerization of Neutral Red performed in the presence of native or oxidatively damaged DNA resulted in formation of hybrid material which activity depended on the DNA conditions. The assembling of the surface layer was confirmed by scanning electron microscopy and electrochemical impedance spectroscopy. The influence of DNA and pillar[5]arene on redox activity of polymeric dye was investigated and a significant increase of the peak currents was found for DNA damaged by reactive oxygen species generated by Cu2+/H2O2 mixture. Pillar[5]arene improves the electron exchange conditions and increases the response and its reproducibility. The applicability of the DNA sensor developed was shown on the example of ascorbic acid as antioxidant. It decreases the current in the concentration range from 1.0 μM to 1.0 mM. The possibility to detect antioxidant activity was qualitatively confirmed by testing tera infusion. The DNA sensor developed can find application in testing of carcinogenic species and searching for new antitumor drugs.

Pulse Electrodeposition of α-Nickel Hydroxide with Flower-Like Nanostructure for Supercapacitors

2011 ◽  
Vol 230-232 ◽  
pp. 429-434 ◽  
Author(s):  
Zheng You ◽  
Xiao Feng Wang ◽  
Kui Shen ◽  
Xiang Hua Kong
Keyword(s):  
Specific Capacitance ◽  
Discharge Capacity ◽  
Nickel Hydroxide ◽  
Pulse Electrodeposition ◽  
Electrochemical Measurements ◽  
Electrochemical Tests ◽  
Electrodeposition Method ◽  
Off Time ◽  
Maximum Specific Capacitance ◽  
Charge Discharge

Nickel hydroxide electrodes with flower-like structure were prepared by pulse electrodeposition method. The samples were characterized by XRD, SEM and electrochemical measurements. XRD results show a typical characteristics of α-Ni(OH)2. SEM results show the morphology can be controlled by the ratio between on-time (Ton) and off-time (Toff). If Ton is constant to 10s, a flower-like structure will be obtained when Toff is bigger than 20s. Electrochemical tests revealed that the Nickel hydroxide electrodes prepared atTon=10 s and Toff = 30s not only has higher discharge capacity but also exhibits superior stability of capacity during charge-discharge cycling. The maximum specific capacitance in the first cycle is 737.74 F/g and their specific capacitance become stable after cycling 20 times.

Ultrathin Nanosheets-Assembled Nickel-Based Metal-Organic Framework Microflowers for Supercapacitor Application

2022 ◽  
Author(s):  
Chong-Huan Wang ◽  
Da-Wei Zhang ◽  
Shude Liu ◽  
Yusuke Yamauchi ◽  
Fei-Bao Zhang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
Metal Organic Framework ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Supercapacitor Application ◽  
Ultrathin Nanosheets ◽  
Metal Organic ◽  
Organic Framework

Herein, we propose a solvent-assisted approach for preparing Ni-MOF microflowers with high specific capacitance and excellent rate capability as an electrode material for supercapacitors. Such high electrochemical performance is attributed...

scholarly journals Zinc/Aluminium–Quinclorac Layered Nanocomposite Modified Multi-Walled Carbon Nanotube Paste Electrode for Electrochemical Determination of Bisphenol A

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 941 ◽  
Author(s):  
Rahadian Zainul ◽  
Nurashikin Abd Azis ◽  
Illyas Md Isa ◽  
Norhayati Hashim ◽  
Mohamad Syahrizal Ahmad ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Bisphenol A ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Electrochemical Determination ◽  
Multiwalled Carbon ◽  
Baby Bottle ◽  
Double Hydroxide ◽  
Paste Electrode

This paper presents the application of zinc/aluminium-layered double hydroxide-quinclorac (Zn/Al-LDH-QC) as a modifier of multiwalled carbon nanotubes (MWCNT) paste electrode for the determination of bisphenol A (BPA). The Zn/Al-LDH-QC/MWCNT morphology was examined by a transmission electron microscope and a scanning electron microscope. Electrochemical impedance spectroscopy was utilized to investigate the electrode interfacial properties. The electrochemical responses of the modified electrode towards BPA were thoroughly evaluated by using square-wave voltammetry technique. The electrode demonstrated three linear plots of BPA concentrations from 3.0 × 10−8–7.0 × 10−7 M (R2 = 0.9876), 1.0 × 10−6–1.0 × 10−5 M (R2 = 0.9836) and 3.0 × 10−5–3.0 × 10−4 M (R2 = 0.9827) with a limit of detection of 4.4 × 10−9 M. The electrode also demonstrated good reproducibility and stability up to one month. The presence of several metal ions and organic did not affect the electrochemical response of BPA. The electrode is also applicable for BPA determination in baby bottle and mineral water samples with a range of recovery between 98.22% and 101.02%.

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