A self-supported hierarchical Co-MOF as a supercapacitor electrode with ultrahigh areal capacitance and excellent rate performance

2018 ◽  
Vol 54 (74) ◽  
pp. 10499-10502 ◽  
Author(s):  
Guilei Zhu ◽  
Hao Wen ◽  
Min Ma ◽  
Weiyi Wang ◽  
Lin Yang ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Rate Performance ◽  
Supercapacitor Electrode ◽  
Areal Capacitance

Hierarchical Co-MOF nanosheet-assembled hexagon-like microblocks serving as a supercapacitor electrode exhibits outstanding areal specific capacitance and Co-MOF/NF//AC achieves a high energy density of 1.7 mW h cm−2 at 4.0 mW cm−2.

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.

scholarly journals Glycerolized Li+ Ion Conducting Chitosan-Based Polymer Electrolyte for Energy Storage EDLC Device Applications with Relatively High Energy Density

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1433 ◽  
Author(s):  
Ahmed S. F. M. Asnawi ◽  
Shujahadeen B. Aziz ◽  
Muaffaq M. Nofal ◽  
Muhamad H. Hamsan ◽  
Mohamad A. Brza ◽  
...  
Keyword(s):  
Energy Density ◽  
Polymer Electrolyte ◽  
Specific Capacitance ◽  
Power Density ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Equivalent Series Resistance ◽  
Ion Conducting ◽  
High Dielectric

In this study, the solution casting method was employed to prepare plasticized polymer electrolytes of chitosan (CS):LiCO2CH3:Glycerol with electrochemical stability (1.8 V). The electrolyte studied in this current work could be established as new materials in the fabrication of EDLC with high specific capacitance and energy density. The system with high dielectric constant was also associated with high DC conductivity (5.19 × 10−4 S/cm). The increase of the amorphous phase upon the addition of glycerol was observed from XRD results. The main charge carrier in the polymer electrolyte was ion as tel (0.044) < tion (0.956). Cyclic voltammetry presented an almost rectangular plot with the absence of a Faradaic peak. Specific capacitance was found to be dependent on the scan rate used. The efficiency of the EDLC was observed to remain constant at 98.8% to 99.5% up to 700 cycles, portraying an excellent cyclability. High values of specific capacitance, energy density, and power density were achieved, such as 132.8 F/g, 18.4 Wh/kg, and 2591 W/kg, respectively. The low equivalent series resistance (ESR) indicated that the EDLC possessed good electrolyte/electrode contact. It was discovered that the power density of the EDLC was affected by ESR.

scholarly journals Flexible Supercapacitor Electrodes Based on Carbon Cloth-Supported LaMnO3/MnO Nano-Arrays by One-Step Electrodeposition

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1676 ◽  
Author(s):  
Pianpian Ma ◽  
Na Lei ◽  
Bo Yu ◽  
Yongkun Liu ◽  
Guohua Jiang ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth ◽  
Supercapacitor Electrode ◽  
Cooperative Effects ◽  
Flexible Supercapacitor ◽  
Symmetric Supercapacitor ◽  
One Step ◽  
New Type

La-based perovskite-type oxide is a new type of supercapacitor electrode material with great potential. In the present study, LaMnO3/MnO (LMO/MnO) nano-arrays supported by carbon cloth are prepared via a simple one-step electrodeposition as flexible supercapacitor electrodes. The structure, deposit morphology of LMO/MnO, and the corresponding electrochemical properties have been investigated in detail. Carbon cloth-supported LMO/MnO electrode exhibits a specific capacitance of 260 F·g−1 at a current density of 0.5 A·g−1 in 0.5 M Na2SO4 aqueous electrolyte solution. The cooperative effects of LMO and MnO, as well as the uniform nano-array morphology contribute to the good electrochemical performance. In addition, a symmetric supercapacitor with a wide voltage window of 2 V is fabricated, showing a high energy density of 28.15 Wh·kg−1 at a power density of 745 W·kg−1. The specific capacitance drops to 65% retention after the first 500 cycles due to the element leaching effect and partial flaking of LMO/MnO, yet remains stable until 5000 cycles. It is the first time that La-based perovskite has been exploited for flexible supercapacitor applications, and further optimization is expected.

The hybrid nanostructure of MnCo2O4.5 nanoneedle/carbon aerogel for symmetric supercapacitors with high energy density

Nanoscale ◽  
2015 ◽  
Vol 7 (34) ◽  
pp. 14401-14412 ◽  
Author(s):  
Pin Hao ◽  
Zhenhuan Zhao ◽  
Liyi Li ◽  
Chia-Chi Tuan ◽  
Haidong Li ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Rate Capability ◽  
Carbon Aerogel ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Hybrid Nanostructure

A porous MnCo2O4.5 nanoneedle/carbon aerogel hybrid nanostructure was synthesized. The synergy of merits of the two kinds of supercapacitors endows the hybrid nanostructure with enhanced specific capacitance, rate capability, energy density and cycling stability.

Cobalt-doping in hierarchical Ni3S2 nanorod arrays enables high areal capacitance

2020 ◽  
Vol 8 (26) ◽  
pp. 13114-13120 ◽  
Author(s):  
Qiang Chen ◽  
Jialun Jin ◽  
Zongkui Kou ◽  
Jiangmin Jiang ◽  
Yulu Fu ◽  
...  
Keyword(s):  
Energy Density ◽  
Hydrothermal Method ◽  
High Energy ◽  
High Energy Density ◽  
Nanorod Arrays ◽  
Cobalt Doping ◽  
Hybrid Supercapacitor ◽  
Free Standing ◽  
Areal Capacitance

Cobalt-doped Ni3S2 nanorod arrays have been prepared via a hydrothermal method. As a free-standing electrode, the Co-Ni3S2 demonstrates ultrahigh areal capacitance, affording the Co-Ni3S2//FeOOH hybrid supercapacitor a high energy density.

Simulating Autoconvective Flow to Improve the Rate Performance of High Energy Density Lithium-Ion Electrodes

2021 ◽  
Vol MA2021-02 (1) ◽  
pp. 162-162
Author(s):  
Akaash Padmanabha ◽  
Alissa Claire Johnson ◽  
James H. Pikul
Keyword(s):  
Energy Density ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Rate Performance
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