ZnS–Ni7S6 Nanosheet Arrays Wrapped with Nanopetals of Ni(OH)2 as a Novel Core–Shell Electrode Material for Asymmetric Supercapacitors with High Energy Density and Cycling Stability Performance

2020 ◽  
Vol 12 (42) ◽  
pp. 47377-47388 ◽  
Author(s):  
Ghuzanfar Saeed ◽  
Parthasarathi Bandyopadhyay ◽  
Sachin Kumar ◽  
Nam Hoon Kim ◽  
Joong Hee Lee
Keyword(s):  
Energy Density ◽  
Electrode Material ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Core Shell ◽  
Asymmetric Supercapacitors ◽  
Stability Performance ◽  
Nanosheet Arrays

Growth of CuCo2O4@MnMoO4 core/shell nanosheet arrays for high energy density asymmetric supercapacitors

2020 ◽  
Vol 341 ◽  
pp. 135893 ◽  
Author(s):  
Sanming Chen ◽  
Shiqiang Cui ◽  
Sundaram Chandrasekaran ◽  
Chong Ke ◽  
Zhongfa Li ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Asymmetric Supercapacitors ◽  
Nanosheet Arrays

Core–Shell Structured NiCo2O4@ZnCo2O4 Nanomaterials with High Energy Density for Hybrid Capacitors

2021 ◽  
Vol 16 (7) ◽  
pp. 1134-1142
Author(s):  
Wenduo Yang ◽  
Jun Xiang ◽  
Sroeurb Loy ◽  
Nan Bu ◽  
Duo Cui ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrode Material ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Structural Characteristics ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Shell Composite ◽  
Hybrid Capacitors

NiCo2O4 as an electrode material for supercapacitors (SCs) has been studied by a host of researchers due to its unique structural characteristics and high capacitance. However, its performance has not yet reached the level of practical applications.it is an effective strategy to synthesize composite electrode materials for tackling the problem. Herein, NiCo2O4@ZnCo2O4 as a novel core–shell composite electrode material has been fabricated through a two-step simple hydrothermal method. The as-prepared sample can be directly used as cathode material of a supercapacitor, and its specific capacitance is 463.1 C/g at 1 A/g. An assembled capacitor has an energy density of 77 Wh·kg−1 at 2700 W·kg−1, and after 8000 cycles, 88% of the initial capacity remains.

A three-dimensional graphene framework-enabled high-performance stretchable asymmetric supercapacitor

2018 ◽  
Vol 6 (4) ◽  
pp. 1802-1808 ◽  
Author(s):  
Ke Li ◽  
Yanshan Huang ◽  
Jingjing Liu ◽  
Mansoor Sarfraz ◽  
Phillips O. Agboola ◽  
...  
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Three Dimensional ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Superior Cycling Stability

Three-dimensional graphene frameworks enable the development of stretchable asymmetric supercapacitors with a record high energy density of 77.8 W h kg−1, and also excellent stretchability and superior cycling stability.

Advanced asymmetric supercapacitors based on CNT@Ni(OH)2 core–shell composites and 3D graphene networks

2015 ◽  
Vol 3 (38) ◽  
pp. 19545-19555 ◽  
Author(s):  
Huan Yi ◽  
Huanwen Wang ◽  
Yuting Jing ◽  
Tianquan Peng ◽  
Yiran Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Power ◽  
Nickel Hydroxide ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
High Power Density ◽  
Asymmetric Supercapacitors ◽  
3D Graphene

Asymmetric supercapacitors with CNT@nickel hydroxide nanosheet composites and 3-D graphene networks demonstrated a high energy density (∼44.0 W h kg−1) and high power density (∼16 kW kg−1) in aqueous KOH electrolyte.

Freestanding and flexible graphene wrapped MnO2/MoO3 nanoparticle based asymmetric supercapacitors for high energy density and output voltage

RSC Advances ◽  
2015 ◽  
Vol 5 (56) ◽  
pp. 45129-45135 ◽  
Author(s):  
Congxing Yang ◽  
Yuling Shi ◽  
Nishuang Liu ◽  
Jiayou Tao ◽  
Siliang Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
Output Voltage ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Asymmetric Supercapacitors ◽  
Good Cycling Stability

Freestanding and flexible asymmetric supercapacitors with good cycling stability.

scholarly journals One-Step Hydrothermal Synthesis of a CoTe@rGO Electrode Material for Supercapacitors

2021 ◽  
Author(s):  
Tianrui Wang ◽  
Yupeng Su ◽  
Mi Xiao ◽  
Meilian Zhao ◽  
Tingwu Zhao ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Power Density ◽  
Current Density ◽  
Electrode Material ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
One Step ◽  
Charge Discharge

AbstractCoTe@reduced graphene oxide (CoTe@rGO) electrode materials for supercapacitors were prepared by a one-step hydrothermal method in this paper. Compared with that of pure CoTe, the electrochemical performance of CoTe@rGO was significantly improved. The results showed that the optimal CoTe@rGO electrode material has a remarkably high specific capacitance of 810.6 F/g at a current density of 1 A/g. At 5 A/g, the synthesized material retained 77.2% of its initial capacitance even after 5000 charge/discharge cycles, thereby demonstrating good cycling stability. Moreover, even at a high current density of 20 A/g, the composite electrode retained 79.0% of its specific capacitance at 1 A/g, thus confirming its excellent rate performance. An asymmetric supercapacitor (ASC) with a wider potential window and higher energy density was assembled by using 3 M KOH as the electrolyte, the CoTe@rGO electrode as the positive electrode, and active carbon as the negative electrode. The operating voltage of the supercapacitor could be increased to 1.6 V, and its specific capacitance could reach 112.6 F/g at 1 A/g. The specific capacitance retention rate of the fabricated supercapacitor after 5000 charge/discharge cycles at 5 A/g was 87.1%, which confirms its excellent cycling stability. In addition, the ASC revealed a high energy density of 40.04 W·h/kg at a power density of 799.91 W/kg and a high power density of 4004.93 W/kg at an energy density of 33.43 W·h/kg. These results collectively show that CoTe@rGO materials have broad application prospects.

Hierarchical NiCo2O4@Ni(OH)2 core-shell nanoarrays as advanced electrodes for asymmetric supercapacitors with high energy density

2019 ◽  
Vol 771 ◽  
pp. 784-792 ◽  
Author(s):  
Ping Xia ◽  
Qiyuan Wang ◽  
Yintao Wang ◽  
Wei Quan ◽  
Deli Jiang ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Asymmetric Supercapacitors
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