scholarly journals Self-Assembly of 3D Fennel-Like Co3O4 with Thirty-Six Surfaces for High Performance Supercapacitor

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Yanfang Li ◽  
Zhenyin Hai ◽  
Xiaojuan Hou ◽  
Hongyan Xu ◽  
Zengxing Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
Electrochemical Impedance ◽  
Nickel Foam ◽  
Synthesis Method ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Electrochemical Performances ◽  
Galvanostatic Charge ◽  
Bet Analysis ◽  
Charge Discharge

Three-dimensional (3D) fennel-like cobalt oxide (II, III) (Co3O4) particles with thirty-six surfaces on nickel foams were prepared via a simple hydrothermal synthesis method and its growth process was also researched. The crystalline structure and morphology were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. The Brunauer-Emmett-Teller (BET) analysis revealed that 3D fennel-like Co3O4 particles have high specific surface area. Therefore, the special structure with thirty-six surfaces indicates the good electrochemical performance of the micron-nanometer material as electrode material for supercapacitors. The cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS) were conducted to evaluate the electrochemical performances. Compared with other morphological materials of the similar sizes, the Co3O4 particles on nickel foam exhibit a high specific capacitance of 384.375 F·g−1 at the current density of 3 A·g−1 and excellent cycling stability of a capacitance retention of 96.54% after 1500 galvanostatic charge-discharge cycles in 6 M potassium hydroxide (KOH) electrolyte.

scholarly journals Fabrication of Hierarchical NiMoO4/NiMoO4 Nanoflowers on Highly Conductive Flexible Nickel Foam Substrate as a Capacitive Electrode Material for Supercapacitors with Enhanced Electrochemical Performance

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1143 ◽  
Author(s):  
Anil Yedluri ◽  
Tarugu Anitha ◽  
Hee-Je Kim
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
High Performance ◽  
Nickel Foam ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Charge Discharge

Hierarchical NiMoO4/NiMoO4 nanoflowers were fabricated on highly conductive flexible nickel foam (NF) substrates using a facile hydrothermal method to achieve rapid charge-discharge ability, high energy density, long cycling lifespan, and higher flexibility for high-performance supercapacitor electrode materials. The synthesized composite electrode material, NF/NiMoO4/NiMoO4 with a nanoball-like NF/NiMoO4 structure on a NiMoO4 surface over a NF substrate, formed a three-dimensional interconnected porous network for high-performance electrodes. The novel NF/NiMoO4/NiMoO4 nanoflowers not only enhanced the large surface area and increased the electrochemical activity, but also provided an enhanced rapid ion diffusion path and reduced the charge transfer resistance of the entire electrode effectively. The NF/NiMoO4/NiMoO4 composite exhibited significantly improved supercapacitor performance in terms of a sustained cycling life, high specific capacitance, rapid charge-discharge capability, high energy density, and good rate capability. Electrochemical analysis of the NF/NiMoO4/NiMoO4 nanoflowers fabricated on the NF substrate revealed ultra-high electrochemical performance with a high specific capacitance of 2121 F g−1 at 12 mA g−1 in a 3 M KOH electrolyte and 98.7% capacitance retention after 3000 cycles at 14 mA g−1. This performance was superior to the NF/NiMoO4 nanoball electrode (1672 F g−1 at 12 mA g−1 and capacitance retention 93.4% cycles). Most importantly, the SC (NF/NiMoO4/NiMoO4) device displayed a maximum energy density of 47.13 W h kg−1, which was significantly higher than that of NF/NiMoO4 (37.1 W h kg−1). Overall, the NF/NiMoO4/NiMoO4 composite is a suitable material for supercapacitor applications.

scholarly journals High Specific Capacitance of the Electrodeposited MnO2 on Porous Foam Nickel Soaked in Alcohol and its Dependence on Precursor Concentration

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 181 ◽  
Author(s):  
Ming Zhang ◽  
Xiaoli Dai ◽  
Cuixian Zhang ◽  
Yuanwu Fuan ◽  
Dingyu Yang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Specific Capacitance ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Retention Rate ◽  
Nickel Foam ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Manganese Acetate ◽  
Mixed Solution

In this work, we used the mixed solution of manganese acetate and sodium sulfate to deposit manganese dioxide on the three-dimensional porous nickel foam that was previously soaked in alcohol, and then the effects of solution concentrations on their capacitance properties were investigated. The surface morphology, microstructure, elemental valence and other information of the material were observed by scanning electron microscope (SEM), Transmission Electron Microscope (TEM), X-ray photoelectron spectroscopy (XPS), etc. The electrochemical properties of the material were tested by Galvanostatic charge-discharge (GCD), Cyclic Voltammetry (CV), Chronoamperometry (CA), Electrochemical impedance spectroscopy (EIS), etc. The MnO2 electrode prepared at lower concentrations can respectively reach a specific capacitance of 529.5 F g−1 and 237.3 F g−1 at the current density of 1 A g−1 and 10 A g−1, and after 2000 cycles, the capacity retention rate was still 79.8% of the initial capacitance, and the energy density can even reach 59.4 Wh Kg−1, while at the same time, it also has a lower electrochemical impedance (Rs = 1.18 Ω, Rct = 0.84 Ω).

Nitric Acid Activated Carbon Aerogels for Supercapacitors

2013 ◽  
Vol 302 ◽  
pp. 158-164 ◽  
Author(s):  
Ya Jie Li ◽  
Xing Yuan Ni ◽  
Jun Shen ◽  
Dong Liu ◽  
Nian Ping Liu
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Electrochemical Impedance ◽  
Carbon Aerogels ◽  
Electrochemical Performances ◽  
Galvanostatic Charge ◽  
Sem Images ◽  
Resorcinol Formaldehyde ◽  
Charge Discharge ◽  
Discharge Test

The electrochemical performances of resorcinol–formaldehyde-based carbon aerogels can be significantly enhanced by nitric acid activation.FT-IR spectra and SEM images reveal the constitution and morphology of samples .The electrochemical performances of materials were tested by cyclic voltammetry,galvanostatic charge/discharge test ,electrochemical impedance spectroscopy and cyclic test. The results show that activation does not influence the molecular structure of carbon aerogels,which maintains their nano-porous structure. Activation increases the specific capacitance by 50% and improves the conductivity of carbon aerogels,resulting in fenfect cycling stability. So nitric acid activated carbon aerogels is an ideal electrode material for supercapacitors.

scholarly journals Waxberry-Like Nanosphere Li4Mn5O12 as High Performance Electrode Materials for Supercapacitors

2018 ◽  
Vol 8 (3) ◽  
pp. 32
Author(s):  
Peiyuan Ji ◽  
Yi Xi ◽  
Chengshuang Zhang ◽  
Chuanshen Wang ◽  
Chenguo Hu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
High Performance ◽  
Electrode Materials ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Diffusion Path ◽  
Electrochemical Performances ◽  
Wet Chemistry ◽  
First Time ◽  
Charge Discharge

Porous materials have superior electrochemical performance owing to its their structure, which could increase the specific and contact area with the electrode. The spinel Li4Mn5O12 has a three-dimensional tunnel structure for a better diffusion path, which has the advantage of lithium ion insertion and extraction in the framework. However, multi-space spherical materials with single morphologies are rarely studied. In this work, waxberry-like and raspberry-like nanospheres for Li4Mn5O12 have been fabricated by the wet chemistry and solid-state methods for the first time. The diameter of a single waxberry- and raspberry-like nanosphere is about 1 μm and 600 nm, respectively. The specific capacitance of Li4Mn5O12 was 535 mF cm−2 and 147.25 F g−1 at the scan rate of 2 mV s−1, and the energy density was 110.7 Wh kg−1, remaining at 70% after 5000th charge-discharge cycles. Compared with raspberry-like nanosphere Li4Mn5O12, the waxberry-like nanoporous spinel Li4Mn5O12 shows the better electrochemical performance and stability; furthermore, these electrochemical performances have been improved greatly compared to the previous studies. All these results indicate that the waxberry-like nanoporous spinel Li4Mn5O12 could provide a potential application in high performance supercapacitors.

scholarly journals Tellurium-Incorporated Nickel-Cobalt Layered Double Hydroxide and Its Oxygen Evolution Reaction

2021 ◽  
Vol 59 (7) ◽  
pp. 491-498
Author(s):  
Jung-Il Lee ◽  
Hui Ra Chae ◽  
Jeong Ho Ryu
Keyword(s):  
Transition Metal ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Nickel Foam ◽  
Low Cost ◽  
Three Dimensional ◽  
Linear Sweep Voltammetry ◽  
Surface Nanostructure

Transition-metal-based layered double hydroxides (LDHs) have attracted substantial attention as highly efficient oxygen evolution reaction (OER) catalysts because they are earth-abundant, low-cost, and environmentally friendly materials with favorable adsorption/desorption energies for intermittent reactants. However, the application of these LDHs as high-performance electrocatalysts is often hindered by their relatively sluggish electronic transport kinetics resulting from their intrinsically low conductivity. Here, we report the effects of incorporating a metalloid into transition metal LDHs on their electrocatalytic activity. In this study, Te-incorporated NiCo LDH (χTe-NiCo LDH) was grown on a three-dimensional porous nickel foam (NF) using a facile solvothermal method with χ = 0.2, 0.4, 0.6 and 0.8. The crystal structure and surface nanostructure were investigated by X-ray diffraction and field-emission scanning electron microscopy. A homogeneous nanosheet structure on the NF was clearly observed for the NiCo LDH and χTe-NiCo (χ = 0.2, 0.4, 0.6) LDHs. However, irregular and collapsed nanostructures were found on the surface of the NF when the Te precursor ratio (χ) exceeded 0.6. The electrocatalytic OER properties were analyzed by linear sweep voltammetry and electrochemical impedance spectroscopy. The amount of Te used in the electrocatalytic reaction was found to play a crucial role in improving the catalytic activity. The optimum Te amount (χ) introduced into the NiCo LDH is discussed with respect to the OER performance.

scholarly journals Capacitive behavior of functionalized activated carbon-based all-solid-state supercapacitor

2021 ◽  
Author(s):  
Kyu Seok Lee ◽  
Ye Ji Seo ◽  
Hyeon Taek Jeong
Keyword(s):  
Cyclic Voltammetry ◽  
Activated Carbon ◽  
Solid State ◽  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
Electrochemical Performances ◽  
Galvanostatic Charge ◽  
Capacitive Behavior ◽  
Charge Discharge ◽  
Discharge Curves

AbstractIn this report, we incorporate activated carbon (AC) onto aluminum substrate via doctor blade method to produce an all-solid-state supercapacitor. The electrochemical properties of the all-solid-state supercapacitor were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Galvanostatic charge/discharge tests also were carried out to exhibit stability of the AC-based supercapacitor. The impedance and charge/discharge curves of the all-solid-state supercapacitor showed good capacitive behavior after functionalized AC. The highest specific capacitance obtained for the AC-based supercapacitor was 106 F g−1. About 160% of specific capacitance increased after functionalization of the AC, which indicated that modification of the AC by nitric acid was able to introduce functional groups on the AC and improve its electrochemical performances.

Polyaniline enfolded hybrid carbon array substrate electrode for high performance supercapacitors

2019 ◽  
Vol 39 (3) ◽  
pp. 228-238 ◽  
Author(s):  
Preetam Bhardwaj ◽  
Shivani Kaushik ◽  
Preeti Gairola ◽  
S.P. Gairola
Keyword(s):  
Specific Capacitance ◽  
Network Architecture ◽  
Electrochemical Impedance ◽  
Oxidative Polymerization ◽  
Thin Layers ◽  
Electrochemical Performances ◽  
Galvanostatic Charge ◽  
Discharge Data ◽  
Hybrid Carbon ◽  
Charge Discharge

Abstract Composites with thin layers of polyaniline (PANI) draped on the surface of a hybrid carbon (HC) array or assemblage were prepared by the oxidative polymerization route. The carbon array substrate is a consistent network architecture of carbon nanotubes and graphene, with the benefit of elevated conductivity and surface area of the carbon components. The exceptional improved electrochemical performances of PANI enfolded HC array electrodes are due to the synergistic effect of the pseudocapacitance of PANI and the electric double layer capacitance of the carbon array. The supercapacitive characteristics of composite materials were inspected by using cyclic voltammetry, the galvanostatic charge-discharge test and electrochemical impedance analysis. The 025PANI-HC composite sample revealed a maximum specific capacitance of 1397.82 F g−1 at a scan rate of 5 mV s−1 and 1430 F g−1 at 1 A g−1 from galvanostatic charge-discharge data, respectively, in 1 m H2SO4. The composites exhibited a much larger specific capacitance value than pristine PANI. Also, the 025PANI-HC electrode had an unwavering operation and its specific capacitance retention was 89%, even after 5000 charge-discharge cycles at 1 A g−1.

Study on PTH/PANI/AC Composites as Electrode Materials for Supercapacitors

2011 ◽  
Vol 239-242 ◽  
pp. 513-516
Author(s):  
Feng Ge Gao ◽  
Yan Hong Tian ◽  
Xue Jun Zhang
Keyword(s):  
Electrode Materials ◽  
Electrochemical Impedance ◽  
In Situ Polymerization ◽  
Electrochemical Performances ◽  
Cycle Stability ◽  
Galvanostatic Charge ◽  
Discharge Performance ◽  
Large Current ◽  
Charge Discharge

Polythionphene (PTH)/polyaniline (PANI)/activated carbon (AC) composites as electrode materials for supercapacitors were synthesized by in-situ polymerization of thionphene on PANI/AC. The surface morphology and the molecular structure of the composites were examined by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The electrochemical performances were tested by cyclic voltammetry, Galvanostatic charge-discharge and electrochemical impedance spectrometry. Results show that the PTH/PANI/AC composites exhibit better large current charge-discharge performance and higher capacitance than those of PANI/AC. The capacitance value of the composites would reach 597.4 F/g. The PTH/PANI/AC composites also have better cycle stability than that of PANI/AC.

scholarly journals Rationally Designed Three-Dimensional NiMoO4/Polypyrrole Core–Shell Nanostructures for High-Performance Supercapacitors

NANO ◽  
2017 ◽  
Vol 12 (05) ◽  
pp. 1750061 ◽  
Author(s):  
Tingting Chen ◽  
Guangning Wang ◽  
Qianyan Ning
Keyword(s):  
High Performance ◽  
Nickel Foam ◽  
Three Dimensional ◽  
Core Shell ◽  
Electrochemical Performances ◽  
Cycle Stability ◽  
Electrodeposition Process ◽  
Composite Nanostructures ◽  
Shell Nanostructures ◽  
A Current

Electrodes of rationally designed composite nanostructures can offer many opportunities for the enhanced performance in electrochemical energy storage. This paper attempts to illustrate the design and production of NiMoO4/polypyrrole core–shell nanostructures on nickel foam to be used in supercapacitor via a facile hydrothermal and electrodeposition process. It has been verified that this novel nanoscale morphology has outstanding capacitive performances. While employed as electrodes in supercapacitors, the composite nanostructures showed remarkable electrochemical performances with a great areal capacitance (3.2[Formula: see text]F/cm2 at a current density of 5[Formula: see text]mA/cm2), and a significant cycle stability (80% capacitance retention after 1000 cycles). The above results reveal that the composite nanostructures may be a likely electrode material for high-performance electrochemical capacitors.

scholarly journals Reduced Graphene Oxide Supported Antimony Species for High-Performance Supercapacitor Electrodes

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Mateusz Ciszewski ◽  
Andrzej Mianowski ◽  
Ginter Nawrat ◽  
Piotr Szatkowski
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Aqueous Electrolyte ◽  
Electrochemical Impedance ◽  
Symmetric System ◽  
Galvanostatic Charge ◽  
Reduced Graphene ◽  
Charge Discharge ◽  
Discharge Curves

Antimony species was chemically anchored on graphene oxide using antimony (III) chloride precursor and then converted to the reduced graphene oxide-antimony species composite by a well-established polyol method. The resultant composite was successfully used as supercapacitor electrodes in a two-electrode symmetric system with aqueous electrolyte. The specific capacitance calculated from the galvanostatic charge/discharge curves obtained for this composite was 289 F/g. The enhanced capacitance results were confirmed by the electrochemical impedance spectroscopy and cyclic voltammetry. The high capacitance of the reduced graphene oxide-antimony species composite arises from the combination of double-layer charging and pseudocapacitance caused by the Faradaic reactions of the intercalated antimony species and residual surface-bonded functional groups.

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