Superior Cycle Stability Performance of Quasi-Cuboidal CoV2O6 Microstructures as Electrode Material for Supercapacitors

2016 ◽  
Vol 8 (40) ◽  
pp. 27291-27297 ◽  
Author(s):  
Yucheng Wang ◽  
Hui Chai ◽  
Hong Dong ◽  
Jiayu Xu ◽  
Dianzeng Jia ◽  
...  
Keyword(s):  
Electrode Material ◽  
Cycle Stability ◽  
Stability Performance

MOF/PEDOT/HPMo-based polycomponent hierarchical hollow micro-vesicles for high performance flexible supercapacitors

2021 ◽  
Vol 9 (5) ◽  
pp. 2948-2958
Author(s):  
Bing Wang ◽  
Shuo Liu ◽  
Lin Liu ◽  
Wen-Wei Song ◽  
Yue Zhang ◽  
...  
Keyword(s):  
Electrode Material ◽  
High Performance ◽  
Cycle Stability ◽  
Supercapacitor Electrode ◽  
Flexible Supercapacitors ◽  
High Area

The three-component PCN-224/PEDOT/PMo12 supercapacitor electrode material is designed to offer high area capacitance, good cycle stability and mechanical flexibility.

Activated Nitrogen-Enriched Carbon/Reduced Expanded Graphite Composites for Supercapacitors

2011 ◽  
Vol 211-212 ◽  
pp. 440-444 ◽  
Author(s):  
Shu Hui Tong ◽  
Chuan Li Qin ◽  
Zheng Jin ◽  
Xue Song Wang ◽  
Xu Duo Bai
Keyword(s):  
Electrode Material ◽  
In Situ Polymerization ◽  
Expanded Graphite ◽  
Mechanical Mixture ◽  
Electrochemical Measurements ◽  
Electrochemical Performances ◽  
Cycle Stability ◽  
Symmetric Supercapacitor ◽  
Graphite Composites

Activated nitrogen-enriched carbon/reduced expanded graphite composites (ANC/REG-c) with different composite ratio were prepared by in-situ polymerization, carbonization, activation and reduction of aniline and expanded graphite. These were characterized by XPS, SEM and electrochemical measurements. XPS shows that N atoms exist in the ANC and ANC/REG-c. Compared to mechanical mixture of ANC and REG(ANC/REG-m), ANC/REG-c shows lower resistance and higherCp1(185.4 F/g) vs 124.3 F/g of ANC/REG-m measured by CV due to the introduction of the composite sturcture. When the composite ratio of ANC/REG-c is 6:1, the ANC/REG-c shows the highestCp1(264.0 F/g) and its symmetric supercapacitor also shows the best synthetical electrochemical performances. The optimal supercapacitor presents good cycle stability. ANC/REG-c is a suitable electrode material for supercapacitors.

scholarly journals Oriented Graphene Based Electrochemical Supercapacitor

2019 ◽  
Author(s):  
Jingxiao Lyu ◽  
Mohannad Mayyas ◽  
Osama Salim ◽  
Dewei Chu ◽  
Rakesh Joshi
Keyword(s):  
Energy Storage ◽  
Surface Area ◽  
Electrode Material ◽  
Structure Stability ◽  
Synthesis Conditions ◽  
Stability Performance ◽  
Excellent Electrochemical Performance ◽  
Energy Storage Applications ◽  
Substantial Interest ◽  
Potential Carbon

Graphene has attracted substantial interest as potential carbon electrode material for energy storage applications. Yet, the utility of this material for these applications is governed by its stability and microstructure (i.e., surface area and porosity). Graphene can be prepared in controlled orientation by changing the surface chemistry of GO flakes in suspensions via reduction which causes the graphene to coagulate and self-assemble in specific patterns. Tuning the structure and porosity of oriented graphene is possible by varying the synthesis conditions. Herein, we report the growth of oriented graphene from a relatively small flake size GO suspension. The prepared electrode material demonstrated an excellent electrochemical performance with a supercapacitance value of 195 F g-1 at 1 mV s-1 and low real impedance with good stability and integrity after 4000 cycles of continuous charge-discharge in 1 M KOH electrolyte. This excellent performance is due to the unique architecture of the oriented graphene which comprises micro-slits and meso-channels among the sheets. The meso-channels were suggested to allow rapid diffusion of charge carriers and ions while the micro-slits increase more surface area for electrochemical interactions per unit volume. The observations reported herein create a new understanding of the structure-stability-performance trade-off in oriented graphene and layout the foundation for further investigations on their sustainable utilization in energy storage applications.

scholarly journals Synthesis of two-dimensional lamellar porous carbon from fluorene for supercapacitors

2020 ◽  
Author(s):  
Xiaoting Wang ◽  
Fangfang Huang ◽  
Chen Zhang ◽  
Moxin Yu
Keyword(s):  
Aspect Ratio ◽  
Specific Surface ◽  
Electrode Material ◽  
Porous Carbon ◽  
Koh Activation ◽  
Lateral Size ◽  
Two Dimensional ◽  
Large Specific Surface Area ◽  
Rate Performance ◽  
Cycle Stability

Abstract Lamellar porous carbons (LPCs) were prepared from fluorene with Mg(OH)2 as template precursors coupled with KOH activation. The as-prepared LPCs feature a large flaky structure containing a large number of micropores and mesopores. This unique structure have a big lateral size/thickness aspect ratio and a large specific surface area of 1879 m2 g− 1. As an electrode material, the LPC shows a high capacitance of 231 F g− 1 at 0.05 A g− 1, excellent rate performance of 173 F g− 1 at 100 A g− 1, and good cycle stability with 95.93% capacitance retention after 10,000 cycles in 6 M KOH electrolyte.

scholarly journals Novel P2-type layered medium-entropy ceramics oxide as cathode material for sodium-ion batteries

2021 ◽  
Author(s):  
Shengxue Yan ◽  
Shaohua Luo ◽  
Liu Yang ◽  
Jian Feng ◽  
Pengwei Li ◽  
...  
Keyword(s):  
Electrode Material ◽  
Rational Design ◽  
Configurational Entropy ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Cycle Stability ◽  
Energy Storage Devices ◽  
Solid State Method ◽  
Voltage Range ◽  
High Entropy

AbstractHigh-entropy oxides (HEOs) and medium-entropy oxides (MEOs) are new types of single-phase solid solution materials. MEOs have rarely been reported as positive electrode material for sodium-ion batteries (SIBs). In this study, we first proposed the concept of the application of MEOs in SIBs. P2-type 3-cation oxide Na2/3Ni1/3Mn1/3Fe1/3O2 (NaNMF) and 4-cation oxide Na2/3Ni1/3Mn1/3Fe1/3−xAlxO2 (NaNMFA) were prepared using the solid-state method, rather than the doping technology. In addition, the importance of the concept of entropy stabilization in material performance and battery cycling was demonstrated by testing 3-cation (NaNMF) and 4-cation (NaNMFA) oxides in the same system. Thus, NaNMFA can provide a reversible capacity of about 125.6 mAh·g−1 in the voltage range of 2–4.2 V, and has enhanced cycle stability. The capacity and decay law of the MEO batteries indicate that the configurational entropy (1.28 R (NaNMFA) > 1.10 R (NaNMF)) of the cationic system, is the main factor affecting the structural and cycle stability of the electrode material. This work emphasizes that the rational design of MEOs with novel structures and different electrochemically active elements may be the strategy for exploring high-performance SIB cathode materials in next-generation energy storage devices.

ZIF-67 derived tricobalt tetroxide induced synthesis of a sandwich layered Co3O4/NiNH electrode material for high performance supercapacitors

2021 ◽  
Author(s):  
Wei Hong ◽  
Yawen Li ◽  
Yiru Wu ◽  
Guifang Li ◽  
Lishan Jia
Keyword(s):  
Energy Density ◽  
Electrode Material ◽  
Self Assembly ◽  
High Performance ◽  
Oxygen Vacancies ◽  
Specific Capacity ◽  
High Energy ◽  
High Energy Density ◽  
Cycle Stability ◽  
High Specific Capacity

The fine Co3O4 particles derived from ZIF-67 induced self-assembly of NiNH to form sandwich layered Co3O4/NiNH with oxygen vacancies which showed high specific capacity. A Co3O4/NiNH//AC supercapacitor has high energy density and cycle stability.

scholarly journals Oriented Graphene Based Electrochemical Supercapacitor

2019 ◽  
Author(s):  
Jingxiao Lyu ◽  
Mohannad Mayyas ◽  
Osama Salim ◽  
Dewei Chu ◽  
Rakesh Joshi
Keyword(s):  
Energy Storage ◽  
Surface Area ◽  
Electrode Material ◽  
Structure Stability ◽  
Synthesis Conditions ◽  
Stability Performance ◽  
Excellent Electrochemical Performance ◽  
Energy Storage Applications ◽  
Substantial Interest ◽  
Potential Carbon

Graphene has attracted substantial interest as potential carbon electrode material for energy storage applications. Yet, the utility of this material for these applications is governed by its stability and microstructure (i.e., surface area and porosity). Graphene can be prepared in controlled orientation by changing the surface chemistry of GO flakes in suspensions via reduction which causes the graphene to coagulate and self-assemble in specific patterns. Tuning the structure and porosity of oriented graphene is possible by varying the synthesis conditions. Herein, we report the growth of oriented graphene from a relatively small flake size GO suspension. The prepared electrode material demonstrated an excellent electrochemical performance with a supercapacitance value of 195 F g-1 at 1 mV s-1 and low real impedance with good stability and integrity after 4000 cycles of continuous charge-discharge in 1 M KOH electrolyte. This excellent performance is due to the unique architecture of the oriented graphene which comprises micro-slits and meso-channels among the sheets. The meso-channels were suggested to allow rapid diffusion of charge carriers and ions while the micro-slits increase more surface area for electrochemical interactions per unit volume. The observations reported herein create a new understanding of the structure-stability-performance trade-off in oriented graphene and layout the foundation for further investigations on their sustainable utilization in energy storage applications.

Porous Poly(5-Cyanoindole) Electrode with High Capacitance

2014 ◽  
Vol 1053 ◽  
pp. 235-239 ◽  
Author(s):  
Wei Qiang Zhou ◽  
Dong Lan Huang ◽  
Xiu Mei Ma ◽  
Jing Kun Xu ◽  
Feng Xing Jiang ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrode Material ◽  
Specific Power ◽  
Cycle Stability ◽  
Active Electrode ◽  
First Time ◽  
Porous Poly ◽  
Charge Discharge ◽  
Scanning Electron ◽  
Discharge Test

A porous poly (5-cyanoindole) film was easily electrodeposited and for the first time evaluated as an active electrode material in 1.0 M H2SO4. The poly (5-cyanoindole) film was investigated using scanning electron microscope, cyclic voltammetry, impedance spectroscopy and charge-discharge test. The specific capacitance of poly (5-cyanoindole) electrode was 336 F g-1 under the current density of 2.4 A g-1 and decreased by 30% after 1000 cycles, which indicated that poly (5-cyanoindole) electrode had good cycle stability. Additionally, the specific energy of poly (5-cyanoindole) electrode reached 23 Wh kg-1 when the specific power was 190 W kg-1. These results indicated the feasibility of poly (5-cyanoindole) as electrode material for supercapacitors.

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