scholarly journals Ionic Liquid-Assisted Synthesis of a NiO/CNTs Composite and Its Electrochemical Capacitance

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Yitong Chen ◽  
Xiangjun Lu ◽  
Bo Gao
Keyword(s):  
Ionic Liquid ◽  
Rate Capability ◽  
Chemical Deposition ◽  
Reaction Medium ◽  
High Specific Capacitance ◽  
Supercapacitor Electrode ◽  
Electrochemical Capacitance ◽  
Solid State Method ◽  
Structure Morphology ◽  
Good Rate Capability

A novel solid-state method has been developed for synthesizing nickel oxide (NiO)/carbon nanotubes (CNTs) composite using an ionic liquid (IL, 1-butyl-3-methylimidazolium chloride) as the reaction medium. Ultraviolet-visible (UV-vis) absorbance spectroscopy, infrared spectroscopy (IR), and scanning electron microscopy (SEM) were employed to investigate the structure, morphology, and formation mechanism of the synthesized sample. The results demonstrated that the IL is effective for dispersing CNTs, which allows the tethering of nickel (II) ions onto the surfaces of the CNTs and facilitates the subsequent chemical deposition of NiO to obtain the NiO/CNTs composite. The electrochemical properties of the composite were determined using cyclic voltammetry and galvanostatic charge/discharge measurements in 6 M KOH. Because of its unique structure, the prepared NiO/CNTs electrode exhibited good capacitive behavior and cyclability. The high specific capacitance (521 F g−1) and good rate capability (91% capacity retention at 0.5 A g−1) of the NiO/CNTs composite enable its use as a practical supercapacitor electrode material.

Hierarchical CuCo2O4@NiMoO4 core–shell hybrid arrays as a battery-like electrode for supercapacitors

2017 ◽  
Vol 4 (9) ◽  
pp. 1575-1581 ◽  
Author(s):  
Jinghuang Lin ◽  
Haoyan Liang ◽  
Henan Jia ◽  
Shulin Chen ◽  
Yifei Cai ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Cycling Stability ◽  
Core Shell ◽  
Excellent Cycling Stability ◽  
Good Rate Capability

Hierarchical CuCo2O4@NiMoO4 core–shell hybrid arrays exhibit a high specific capacitance, good rate capability and excellent cycling stability.

Homogeneous Growth of Ni(OH)2 Nanoparticle on Carbon Nanotubes for High-Performance Supercapacitor Electrode Material

2017 ◽  
Vol 727 ◽  
pp. 732-737 ◽  
Author(s):  
Fei Fei Sun ◽  
Dong Lin Zhao ◽  
Cheng Li ◽  
Xia Jun Wang ◽  
Ji Xiang Chen ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Performance ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Chemical Precipitation ◽  
Supercapacitor Electrode ◽  
Supercapacitive Performance ◽  
A Current

A homogeneous Ni (OH)2/ carbon nanotubes (CNTs) nanocomposite with excellent supercapacitive performance has been synthesized via a facile chemical precipitation. The microstructure and morphology of Ni (OH)2/CNTs nanocomposite were investigated by XRD, SEM and TEM. It presented an ideal morphology with the nanosized Ni (OH)2 particles homogeneously growing on the CNTs. The electrochemical performance of the Ni (OH)2/CNTs nanocomposite was test by cyclic voltammetry, galvanostatic charge−discharge and electrochemical impedance spectroscopy techniques. The synthesized Ni (OH)2/CNTs nanocomposite shows superior electrochemical performance, including high capacitance, excellent rate capability and good cycle life. The homogeneous Ni (OH)2/ CNTs nanocomposite exhibited a high specific capacitance of 1741 F g-1 at a current density of 1A g-1 and maintained a good stability after 5000 cycles at 10A g-1`, suggesting that it can be a promising candidate for supercapacitor.

Low-Temperature Hydrothermal Synthesis and Electrochemical Properties of Birnessit-Type Manganese Dioxide Nanosheets

2013 ◽  
Vol 800 ◽  
pp. 393-397 ◽  
Author(s):  
De Yan ◽  
Ying Liu ◽  
Zhi Guo Wu ◽  
Ren Fu Zhuo ◽  
Jun Wang
Keyword(s):  
Low Temperature ◽  
Current Density ◽  
High Current Density ◽  
Hydrothermal Process ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
High Current ◽  
Cycle Stability ◽  
Good Rate Capability ◽  
A Current

Birnessite MnO2 nanosheets were synthesized by self-limiting deposition of KMnO4 in a facile low-temperature hydrothermal process. The MnO2 electrode exhibits a high specific capacitance of 169 F g-1 at a current density of 0.1 A g-1, good rate capability with a capacitance of 96 F g-1 even at a high current density of 5 A g-1, as well as excellent cycle stability with capacitance retention of 94% at 1 A g-1 after 1,000 cycles.

Non-covalently functionalizing a graphene framework by anthraquinone for high-rate electrochemical energy storage

RSC Advances ◽  
2015 ◽  
Vol 5 (30) ◽  
pp. 23942-23951 ◽  
Author(s):  
Ning An ◽  
Fuhai Zhang ◽  
Zhongai Hu ◽  
Zhimin Li ◽  
Li Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Covalent Modification ◽  
High Rate ◽  
Electrochemical Energy Storage ◽  
Long Cycle Life ◽  
Redox Couples ◽  
Reversible Redox ◽  
Good Rate Capability

Anthraquinone (AQ) with electrochemically reversible redox couples is selected to functionalize graphene framework (GF) through non-covalent modification and the composite achieves high specific capacitance, good rate capability and long cycle life.

Homogeneous Growth of Ni(OH)2 Nanoparticle on Graphene Nanosheet for High-Performance Supercapacitor Electrode Material

2016 ◽  
Vol 852 ◽  
pp. 921-927 ◽  
Author(s):  
Huan Lin ◽  
Dong Lin Zhao ◽  
Ran Ran Yao ◽  
Zhao Hui Qiang ◽  
Wan Xin Zhang ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Chemical Precipitation ◽  
High Energy ◽  
High Rate ◽  
Supercapacitor Electrode ◽  
Graphene Nanosheet

A homogeneous Ni (OH)2/graphene nanosheet (GNS) nanocomposite with excellent supercapacitive performance has been synthesized by a facile chemical precipitation. The Ni (OH)2/GNS nanocomposite presented an ideal morphology with the nanosized Ni (OH)2 particles homogeneously growing on the GNS. Its microstructure, morphology were investigated by XRD, SEM and TEM. The electrochemical performance of the Ni (OH)2/GNS nanocomposite was test by cyclic voltammetry, galvanostatic charge−discharge and electrochemical impedance spectroscopy techniques. The homogeneous Ni (OH)2/GNS nanocomposite exhibited a high specific capacitance of 1667 F/g at a current density of 1A/g and maintained a good stability in 5000 cycles, suggesting that it can be a promising candidate for supercapacitor. The high specific capacitance and remarkable rate capability are promising for applications in supercapacitors with both high energy and power densities. The Ni (OH)2/GNS nanocomposite exhibited large specific capacitance, high rate capability and good cycling stability.

Facile synthesis of a metal–organic framework-derived Mn2O3 nanowire coated three-dimensional graphene network for high-performance free-standing supercapacitor electrodes

2016 ◽  
Vol 4 (21) ◽  
pp. 8283-8290 ◽  
Author(s):  
Dong Ji ◽  
Hu Zhou ◽  
Jian Zhang ◽  
Yuanyuan Dan ◽  
Hongxun Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Free Standing ◽  
Metal Organic ◽  
Oxide Composites ◽  
First Time ◽  
Good Rate Capability

3DGN and MOF-derived metal oxide composites as free-standing electrodes for supercapacitors have been reported for the first time which exhibit a high specific capacitance, good rate capability and excellent long cycle stability.

scholarly journals Simultaneous Electrospinning and Electrospraying for the Preparation of a Precursor Membrane Containing Hydrothermally Generated Biochar Particles to Produce the Value-Added Product of Carbon Nanofibrous Felt

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 676
Author(s):  
Xianfu Li ◽  
Tao Xu ◽  
Zhipeng Liang ◽  
Vinod S. Amar ◽  
Runzhou Huang ◽  
...  
Keyword(s):  
Corn Stover ◽  
Rate Capability ◽  
Value Added ◽  
Thermal Stabilization ◽  
Hydrothermal Liquefaction ◽  
Supercapacitor Electrode ◽  
A Value ◽  
Good Rate Capability ◽  
Anaerobic Environment

Biochar is a byproduct generated from the hydrothermal liquefaction of biomass, such as corn stover, in an anaerobic environment. This work aims to convert biochar into a value-added product of carbon nanofibrous felt. First, the biochar-containing precursor membrane was prepared from simultaneous electrospinning and electrospraying. After thermal stabilization in air and carbonization in argon, the obtained precursor membrane was converted into a mechanically flexible and robust carbon nanofibrous felt. Electrochemical results revealed that the biochar-derived carbon nanofibrous felt might be a good candidate as a supercapacitor electrode with a good rate capability and high kinetic performance.

scholarly journals PVP Assisted Grass-like NiSe@ZnSe Composite for Environmental Energy Applications

2021 ◽  
Author(s):  
M. Sangeetha Vidhya ◽  
R Yuvakkumar ◽  
G. Ravi ◽  
Mehboobali Pannipara ◽  
Abdullah G. Al-Sehemi ◽  
...  
Keyword(s):  
Rate Capability ◽  
Volume Ratio ◽  
Reaction Rates ◽  
High Rate ◽  
Lauryl Sulfate ◽  
Supercapacitor Electrode ◽  
Electrochemical Capacitance ◽  
Energy Applications ◽  
Interesting Approach ◽  
Constant Charge

Abstract Well defined NiSe@ZnSe composite electrode is synthesized along with Polyvinyl pyrrolidone (PVP) and Sodium Lauryl Sulfate (SLS) surfactant whose redox behavior is an interesting approach towards the boosting performance of the supercapacitor. The as-prepared samples were examined through standard characterization techniques. High crystallinity suggests that prepared composite NiSe@ZnSe is well appropriate for the application concerning the supercapacitor electrode material. The Raman spectroscopy identifies the functional group, vibrations, stretching of bonds and presence of defects in the samples. The surface to volume ratio of the loosely packed grass-like structures result in availability of more surface area for the electrolyte which lead to the enhanced reaction rates. As-prepared active synthesized product revealed 442 Fg-1 electrochemical capacitance at 1 Ag-1 with 99.3% high rate capability at 10 Ag-1 after 2000 cycles. Besides, notably capacity retention of the sandwiched asymmetric NiSe@ZnSe//AC device maintains 99.48% after constant charge discharge 2000 cycles displays outstanding electrochemical stability.

Facile synthesis of single-crystalline NiO nanosheet arrays on Ni foam for high-performance supercapacitors

CrystEngComm ◽  
2014 ◽  
Vol 16 (14) ◽  
pp. 2878-2884 ◽  
Author(s):  
Ming Huang ◽  
Fei Li ◽  
Jun Yi Ji ◽  
Yu Xin Zhang ◽  
Xiao Li Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Cost Effective ◽  
Ni Foam ◽  
Single Crystalline ◽  
Nanosheet Arrays ◽  
Binder Free ◽  
Hydrothermal Approach ◽  
Good Rate Capability

Single-crystalline NiO nanosheet arrays on Ni foam as a binder-free electrode for high-performance supercapacitors, fabricated by a facile and cost-effective hydrothermal approach, exhibit a high specific capacitance, good rate capability, and excellent cycling stability.

Ni(OH)2 nanosheets grown on a 3D graphene framework as an excellent cathode for flexible supercapacitors

RSC Advances ◽  
2014 ◽  
Vol 4 (88) ◽  
pp. 47609-47614 ◽  
Author(s):  
Yufang Ma ◽  
Wanjun Chen ◽  
Peng Zhang ◽  
Feng Teng ◽  
Jinyuan Zhou ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Hydrothermal Method ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
3D Graphene ◽  
Graphene Composite ◽  
Flexible Supercapacitors ◽  
Good Rate Capability

A simple and scalable hydrothermal method is used to fabricate the Ni(OH)2 nanosheets/3D graphene composite, which presents high specific capacitance and good rate capability.

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