A high-performance graphene based asymmetric supercapacitor

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040007
Author(s):  
Syeda Wishal Bokhari ◽  
Ahmad Hassan Siddique ◽  
Harshpreet Singh ◽  
Muhammad Dilawer Hayat ◽  
Shenmin Zhu ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Power Density ◽  
High Performance ◽  
Hybrid Nanocomposites ◽  
Asymmetric Supercapacitor ◽  
Galvanostatic Charge ◽  
Asymmetric Device ◽  
Charge Discharge

We present the design of a high-performance 2 V asymmetric supercapacitor made of graphene-based hybrid nanocomposites in 1 M KOH electrolyte. rGO-CNT-FeOOH (GC-F) was used as the cathode and rGO-CNC-MnO2 (GC-M) as the anode. Both composites well balanced each other in the asymmetric device and gave a high electrochemical performance. The energy density of this ASC is 66.6 W h kg[Formula: see text] at 3.8 kW kg[Formula: see text] power density with an excellent capacitance retention of 88% after 3000 galvanostatic charge-discharge cycles.

NiS nanosheets synthesized by one-step microwave for high-performance supercapacitor

2021 ◽  
Author(s):  
Jun Song ◽  
Lijun Du ◽  
Jingyi Wang ◽  
Huaiping Zhang ◽  
Yaodong Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Electrochemical Performance ◽  
Power Density ◽  
Microwave Radiation ◽  
High Performance ◽  
Negative Electrode ◽  
Asymmetric Supercapacitor ◽  
Capacity Retention ◽  
One Step

The NiS nanosheets were fabricated using one-step microwave approach with the microwave radiation of 800 W for 1.5 min. Impressively, the NiS nanosheets revealed praiseworthy electrochemical performance, with a capacitance value of 1082.8 F ⋅ g[Formula: see text] at 1 A ⋅ g[Formula: see text] and 77.8% retention over 5000 cycles at 5 A ⋅ g[Formula: see text]. Moreover, an asymmetric supercapacitor was assembled with NiS as the positive electrode and activated carbon (AC) as the negative electrode. It shows 80.42% capacity retention after 8000 cycles and an energy density of 19.45 W ⋅ h ⋅ kg[Formula: see text] at a power density of 801.05 W ⋅ kg[Formula: see text].

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.

Tailoring the morphology followed by the electrochemical performance of NiMn-LDH nanosheet arrays through controlled Co-doping for high-energy and power asymmetric supercapacitors

2017 ◽  
Vol 46 (38) ◽  
pp. 12876-12883 ◽  
Author(s):  
Saurabh Singh ◽  
Nanasaheb M. Shinde ◽  
Qi Xun Xia ◽  
Chandu V. V. M. Gopi ◽  
Je Moon Yun ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Power Density ◽  
High Energy ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Co Doping ◽  
Nanosheet Arrays

A NiCoMn-LDH (10%)//rGO asymmetric supercapacitor device with 574 Wh kg−1 energy density at 749.9 W kg−1 power density and 89.4% retention even after 2500 cycles has been explored.

A high performance solid state asymmetric supercapacitor device based upon NiCo2O4nanosheets//MnO2microspheres

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 70292-70302 ◽  
Author(s):  
Syed Khalid ◽  
Chuanbao Cao ◽  
Lin Wang ◽  
Youqi Zhu ◽  
Yu Wu
Keyword(s):  
Solid State ◽  
Energy Density ◽  
Power Density ◽  
High Performance ◽  
Asymmetric Supercapacitor ◽  
State Device ◽  
Solid State Device

The volumetric energy density and power density of a novel solid state device (NiCo2O4//MnO2) are much higher than most reported devices.

An all-solid-state asymmetric device based on a polyaniline hydrogel for a high energy flexible supercapacitor

2017 ◽  
Vol 41 (1) ◽  
pp. 237-244 ◽  
Author(s):  
Hamid Heydari ◽  
Mohammad B. Gholivand
Keyword(s):  
Solid State ◽  
Energy Density ◽  
High Performance ◽  
High Energy ◽  
Gel Electrolyte ◽  
Asymmetric Supercapacitor ◽  
Flexible Supercapacitor ◽  
Asymmetric Device

3D porous PANI hydrogel and a gel electrolyte were used to fabricate a high performance, all-solid-state, flexible asymmetric supercapacitor with an energy density of up to 6.16 mW h cm−3.

Engineering onion-like nanoporous CuCo2O4 hollow spheres derived from bimetal–organic frameworks for high-performance asymmetric supercapacitors

2018 ◽  
Vol 6 (22) ◽  
pp. 10497-10506 ◽  
Author(s):  
Ali A. Ensafi ◽  
Seyyed Ebrahim Moosavifard ◽  
B. Rezaei ◽  
Saeid Kamari Kaverlavani
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Performance ◽  
Hollow Spheres ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors

An asymmetric supercapacitor fabricated using onion-like nanoporous CuCo2O4 hollow spheres exhibits an energy density of 48.75 W h kg−1 and a power density of 37.5 kW kg−1, which can compete with Ni–MH batteries.

High-performance Ultracapacitor Electrodes Realized by 3-dimensionally Bicontinuous Block Copolymer Nanostructures with Enhanced Ion Kinetics

2021 ◽  
Author(s):  
Gun Ho Lee ◽  
Byung Jun Park ◽  
Tae Won Nam ◽  
Ye Ji Kim ◽  
Gyu Rac Lee ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Energy Density ◽  
Electrochemical Performance ◽  
Power Density ◽  
High Power ◽  
High Performance ◽  
High Power Density ◽  
Excellent Electrochemical Performance ◽  
Battery Systems ◽  
Critical Challenge

Despite the high power density of ultracapacitors, increasing the energy density to level that of conventional battery systems remains a critical challenge. Here, we report excellent electrochemical performance of three-dimensionally...

Pseudocapacitive behaviours of Na2Ti3O7@CNT coaxial nanocables for high-performance sodium-ion capacitors

2015 ◽  
Vol 3 (42) ◽  
pp. 21277-21283 ◽  
Author(s):  
Shengyang Dong ◽  
Laifa Shen ◽  
Hongsen Li ◽  
Ping Nie ◽  
Yaoyao Zhu ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Power Density ◽  
High Power ◽  
High Performance ◽  
High Energy ◽  
Sodium Ion ◽  
High Energy Density ◽  
High Power Density ◽  
Coaxial Nanocables

Pseudocapacitive behaviours of Na2Ti3O7@CNTs enhance the electrochemical performance of Na-ion capacitors with high energy density and high power density.

Mesoporous NiCo2Se4 tube as an efficient electrode material with enhanced performance for asymmetric supercapacitor applications

CrystEngComm ◽  
2021 ◽  
Author(s):  
Zhixiang Guo ◽  
Yuting Diao ◽  
Xinru Han ◽  
Zihao Liu ◽  
Yonghong Ni ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Energy Density ◽  
Electrochemical Performance ◽  
Power Density ◽  
Electrode Material ◽  
Asymmetric Supercapacitor ◽  
High Electrical Conductivity ◽  
Supercapacitor Applications

• One-component NiCo2Se4 is synthesized. • The unique mesoporous tubular micro-nanostructure greatly improves the electrochemical performance. • Selenium with high electrical conductivity is beneficial for improving the energy density and power density.

Facile fabrication of Co2CuS4 nanoparticle anchored N-doped graphene for high-performance asymmetric supercapacitors

2016 ◽  
Vol 4 (44) ◽  
pp. 17560-17571 ◽  
Author(s):  
Meng Guo ◽  
Jayaraman Balamurugan ◽  
Tran Duy Thanh ◽  
Nam Hoon Kim ◽  
Joong Hee Lee
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Power ◽  
High Performance ◽  
Cycling Stability ◽  
Asymmetric Supercapacitor ◽  
High Power Density ◽  
Asymmetric Supercapacitors ◽  
Doped Graphene ◽  
Facile Fabrication

A novel Co2CuS4/NG composite based asymmetric supercapacitor delivers superb energy density (~53.3 W h kg−1), high power density (~10936 W kg−1 at 38.4 W h kg−1) and outstanding cycling stability (~4000 cycles).

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