scholarly journals Ultrathin MnO2 nanoflakes grown on N-doped carbon nanoboxes for high-energy asymmetric supercapacitors

2015 ◽  
Vol 3 (42) ◽  
pp. 21337-21342 ◽  
Author(s):  
Yihui Dai ◽  
Ling Chen ◽  
Vladimir Babayan ◽  
Qilin Cheng ◽  
Petr Saha ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Negative Electrode ◽  
High Energy ◽  
Positive Electrode ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors

A green asymmetric supercapacitor has been assembled using MnO2/C hollow nanoboxes as a positive electrode and the corresponding N-doped carbon nanoboxes as a negative electrode, which exhibits an impressive electrochemical performance.

Electrochemical performance of an asymmetric supercapacitor based on graphene and cobalt molybdate electrodes

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16319-16327 ◽  
Author(s):  
Ganesh Kumar Veerasubramani ◽  
Karthikeyan Krishnamoorthy ◽  
Sang Jae Kim
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Negative Electrode ◽  
Positive Electrode ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Reduced Graphene ◽  
Cobalt Molybdate

In this article, we report the fabrication and electrochemical performance of asymmetric supercapacitors (ASCs) based on a reduced graphene oxide (rGO) negative electrode and a cobalt molybdate (CoMoO4) positive electrode.

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.

scholarly journals Asymmetric supercapacitors with excellent rate performance by integrating Co(OH)F nanorods and layered Ti3C2Tx paper

RSC Advances ◽  
2019 ◽  
Vol 9 (53) ◽  
pp. 30957-30963 ◽  
Author(s):  
Si Chen ◽  
Xuejiao Zhou ◽  
Xinzhi Ma ◽  
Lu Li ◽  
Panpan Sun ◽  
...  
Keyword(s):  
Negative Electrode ◽  
Positive Electrode ◽  
Asymmetric Supercapacitor ◽  
Rate Performance ◽  
Ni Foam ◽  
Asymmetric Supercapacitors

Here we describe an aqueous asymmetric supercapacitor assembled using Co(OH)F nanorods on Ni foam (Co(OH)F@NF) as the positive electrode and layered Ti3C2Tx paper on Ni foam (Ti3C2Tx@NF) as the negative electrode.

Three-dimensional Co3O4@C@Ni3S2 sandwich-structured nanoneedle arrays: towards high-performance flexible all-solid-state asymmetric supercapacitors

2015 ◽  
Vol 3 (31) ◽  
pp. 16150-16161 ◽  
Author(s):  
Dezhi Kong ◽  
Chuanwei Cheng ◽  
Ye Wang ◽  
Jen It Wong ◽  
Yaping Yang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Solid State ◽  
High Performance ◽  
Three Dimensional ◽  
Negative Electrode ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Cycle Stability ◽  
Asymmetric Supercapacitors

A novel asymmetric supercapacitor composed of Co3O4@C@Ni3S2 NNAs as the positive electrode and activated carbon (AC) as the negative electrode can deliver a high energy density and excellent long cycle stability.

Band gap modified boron doped NiO/Fe3O4 nanostructure as the positive electrode for high energy asymmetric supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1380-1387 ◽  
Author(s):  
Sanjit Saha ◽  
Milan Jana ◽  
Partha Khanra ◽  
Pranab Samanta ◽  
Hyeyoung Koo ◽  
...  
Keyword(s):  
Band Gap ◽  
Hydrothermal Method ◽  
Electrode Material ◽  
High Energy ◽  
Positive Electrode ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Boron Doped ◽  
Positive Electrode Material ◽  
One Step

A boron doped NiO/Fe3O4 nanostructure was successfully synthesized by a facile one-step hydrothermal method and used as the positive electrode material in asymmetric supercapacitor.

Fabrication of hollow nanorod electrodes based on RuO2//Fe2O3 for an asymmetric supercapacitor

2018 ◽  
Vol 47 (23) ◽  
pp. 7747-7753 ◽  
Author(s):  
Qiufan Wang ◽  
Xiao Liang ◽  
Yun Ma ◽  
Daohong Zhang
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Power ◽  
Negative Electrode ◽  
High Energy ◽  
Positive Electrode ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
High Power Density ◽  
High Capacitance

A novel type of asymmetric supercapacitor was fabricated by assembling a RuO2 positive electrode and a Fe2O3 negative electrode. Full cells are constructed and show a high capacitance of 4.9 F cm−3, a high energy density of 1.5 mW h cm−3 and a high power density of 9.1 mW cm−3.

Polypyrrole and polypyrrole@MnO2 nanowires grown on graphene foam for asymmetric supercapacitor

2020 ◽  
Vol 10 (8) ◽  
pp. 1308-1316
Author(s):  
Shuang Dong ◽  
Zhengyun Wang ◽  
Junlei Wang ◽  
Yin Yao ◽  
Hongfang Liu
Keyword(s):  
Rational Design ◽  
Active Material ◽  
Negative Electrode ◽  
High Energy ◽  
Cycling Stability ◽  
Positive Electrode ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Graphene Foam ◽  
Polypyrrole Nanowires

The asymmetric supercapacitor with negative electrode by graphene foam loaded Polypyrrole nanowires (PPy NWs/rGOF) and positive electrode by PPy@MnO2 core–shell nanowires on graphene foam (PPy@MnO2 NWs/rGOF) was developed. The negative electrode was further converted into the positive electrode by one-step redox reaction at room temperature. Graphene foam (rGOF) with unique flexibility, large surface area and high electric conductivity can favor in situ growth of polypyrrole nanowires (PPy NWs) as well as improve cycling stability of the resultant negative electrode. PPy NWs served as the ideal template for the formation of MnO2 shell gives rise to the as-prepared positive electrode with fast electron transport and enhanced active material utilization. Owing to the rational design, the assembled asymmetric supercapacitor was able to be repeatedly discharged/charged at 1.6 V, displaying high energy density of 1.04 mWh cm–3 with improved cycling stability.

Vacancies-engineered MoO3 and Na+-preinserted MnO2 in-situ grown N-doped graphene nanotubes as electrode materials for high-performance asymmetric supercapacitor

2021 ◽  
Author(s):  
Jian Zhao ◽  
He Cheng ◽  
Huanyu Li ◽  
Yan-Jie Wang ◽  
Qingyan Jiang ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
High Energy ◽  
Cooperative Effect ◽  
Electrochemical Energy Storage ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Doped Graphene ◽  
Power Densities

Developing advanced negative and positive electrode materials for asymmetric supercapacitors (ASCs) as the electrochemical energy storage can enable the device to reach high energy/power densities resulting from the cooperative effect...

Flexible high-energy asymmetric supercapacitors based on MnO@C composite nanosheet electrodes

2017 ◽  
Vol 5 (2) ◽  
pp. 804-813 ◽  
Author(s):  
Neng Yu ◽  
Kai Guo ◽  
Wei Zhang ◽  
Xianfu Wang ◽  
Ming-Qiang Zhu
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Energy ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Positive Electrodes

A flexible asymmetric supercapacitor assembled with novel MnO@C composite nanosheets and Co3O4 nanosheets as negative and positive electrodes achieves an exceptional energy density of 59.6 W h kg−1 at a power density of 1529.8 W kg−1.

Hierarchical coral-like MnCo2O4.5@Co-Ni LDH composites on Ni foam as promising electrodes for high-performance supercapacitor

2021 ◽  
Author(s):  
yajun JI ◽  
Fei Chen ◽  
Shufen Tan ◽  
Fuyong Ren
Keyword(s):  
Electrochemical Performance ◽  
Metal Oxides ◽  
High Performance ◽  
High Capacity ◽  
Rate Capability ◽  
Negative Electrode ◽  
High Energy ◽  
Hybrid Nanostructures ◽  
High Energy Density ◽  
Ni Foam

Abstract Transition metal oxides are generally designed as hybrid nanostructures with high performance for supercapacitors by enjoying the advantages of various electroactive materials. In this paper, a convenient and efficient route had been proposed to prepare hierarchical coral-like MnCo2O4.5@Co-Ni LDH composites on Ni foam, in which MnCo2O4.5 nanowires were enlaced with ultrathin Co-Ni layered double hydroxides nanosheets to achieve high capacity electrodes for supercapacitors. Due to the synergistic effect of shell Co-Ni LDH and core MnCo2O4.5, the outstanding electrochemical performance in three-electrode configuration was triggered (high area capacitance of 5.08 F/cm2 at 3 mA/cm2 and excellent rate capability of maintaining 61.69 % at 20 mA/cm2), which is superior to those of MnCo2O4.5, Co-Ni LDH and other metal oxides based composites reported. Meanwhile, the as-prepared hierarchical MnCo2O4.5@Co-Ni LDH electrode delivered improved electrical conductivity than that of pristine MnCo2O4.5. Furthermore, the as-constructed asymmetric supercapacitor using MnCo2O4.5@Co-Ni LDH as positive and activated carbon as negative electrode presented a rather high energy density of 220 μWh/cm2 at 2400 μW/cm2 and extraordinary cycling durability with the 100.0 % capacitance retention over 8000 cycles at 20 mA/cm2, demonstrating the best electrochemical performance compared to other asymmetric supercapacitors using metal oxides based composites as positive electrode material. It can be expected that the obtained MnCo2O4.5@Co-Ni LDH could be used as the high performance and cost-effective electrode in supercapacitors.

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