A low crystallinity oxygen-vacancy-rich Co3O4 cathode for high-performance flexible asymmetric supercapacitors

2018 ◽  
Vol 6 (33) ◽  
pp. 16094-16100 ◽  
Author(s):  
Jiaxin Hao ◽  
Shanglong Peng ◽  
Haoqian Li ◽  
Shan Dang ◽  
Tianfeng Qin ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Specific Capacitance ◽  
High Performance ◽  
Active Material ◽  
Simple Synthesis ◽  
Synthesis Process ◽  
Asymmetric Supercapacitors ◽  
Low Crystallinity

Co3O4 has received ever-growing interest as an electro-active material for supercapacitors due to its high theoretical specific capacitance (3560 F g−1) and simple synthesis process.

scholarly journals Dissected carbon nanotubes functionalized by 1-hydroxyanthraquinone for high-performance asymmetric supercapacitors

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48341-48353 ◽  
Author(s):  
Xia Yang ◽  
Yuying Yang ◽  
Quancai Zhang ◽  
Xiaotong Wang ◽  
Yufeng An ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Covalent Modification ◽  
Asymmetric Supercapacitors ◽  
Reduced Graphene

1-Hydroxyanthraquinone (HAQ) is selected to functionalize the dissected carbon nanotubes (rDCNTs) with reduced graphene oxide layers through non-covalent modification. The composite achieves high specific capacitance and ultrahigh rate capability.

Nitrogen-doped hollow carbon spheres functionalized by 9,10-phenanthrenequinone molecules as a high-performance electrode for asymmetric supercapacitors

2019 ◽  
Vol 43 (16) ◽  
pp. 6380-6387 ◽  
Author(s):  
Wenbin Wang ◽  
Yuying Yang ◽  
Xiaotong Wang ◽  
Yi Zhou ◽  
Xinyuan Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
Active Material ◽  
Carbon Spheres ◽  
Asymmetric Supercapacitors ◽  
Nitrogen Doped ◽  
Electrochemically Active ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

9,10-Phenanthrenequinone as a novel organic electrochemically active material for supercapacitors has been non-covalently functionalized onto N-doped hollow carbon spheres.

High electrochemical performance in asymmetric supercapacitors using MWCNT/nickel sulfide composite and graphene nanoplatelets as electrodes

2014 ◽  
Vol 2 (39) ◽  
pp. 16723-16730 ◽  
Author(s):  
Arvinder Singh ◽  
Alexander J. Roberts ◽  
Robert C. T. Slade ◽  
Amreesh Chandra
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
Nickel Sulfide ◽  
High Specific Capacitance ◽  
Graphene Nanoplatelets ◽  
Cyclic Stability ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors

A high-performance asymmetric supercapacitor was fabricated using MWCNTs/NiS composite and GNPs as electrodes, exhibiting high specific capacitance of ∼181 F g−1 at 1 A g−1 current density and excellent cyclic stability with 92% retention after 1000 cycles at 2 A g−1 current density.

Constructing hierarchical dandelion-like molybdenum–nickel–cobalt ternary oxide nanowire arrays on carbon nanotube fiber for high-performance wearable fiber-shaped asymmetric supercapacitors

2017 ◽  
Vol 5 (40) ◽  
pp. 21153-21160 ◽  
Author(s):  
Juan Sun ◽  
Qichong Zhang ◽  
Xiaona Wang ◽  
Jingxin Zhao ◽  
Jiabin Guo ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Specific Capacitance ◽  
High Performance ◽  
High Specific Capacitance ◽  
Nanowire Arrays ◽  
Ternary Oxide ◽  
Asymmetric Supercapacitors ◽  
Carbon Nanotube Fiber ◽  
Nickel Cobalt

The fabricated electrode delivers high specific capacitance and is applied to fiber-shaped asymmetric supercapacitors.

A facile synthesis of porous bimetallic Co–Ni fluorides for high-performance asymmetric supercapacitors

Nanoscale ◽  
2020 ◽  
Vol 12 (20) ◽  
pp. 11143-11152 ◽  
Author(s):  
Xiaoya Zhou ◽  
Xinyu Qu ◽  
Wen Zhao ◽  
Yanfang Ren ◽  
Yao Lu ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
High Performance ◽  
Cycling Stability ◽  
Facile Synthesis ◽  
Step Method ◽  
Asymmetric Supercapacitors

Porous Co–Ni fluorides were synthesized using a two-step method and they exhibited excellent specific capacitance and cycling stability.

Synthesis of peanut-like hierarchical manganese carbonate microcrystals via magnetically driven self-assembly for high performance asymmetric supercapacitors

2017 ◽  
Vol 5 (8) ◽  
pp. 3923-3931 ◽  
Author(s):  
Yongfu Tang ◽  
Shunji Chen ◽  
Teng Chen ◽  
Wenfeng Guo ◽  
Yanshuai Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
High Performance ◽  
Hydrothermal Process ◽  
Active Material ◽  
Manganese Carbonate ◽  
Asymmetric Supercapacitors

Peanut-like hierarchical MnCO3 microcrystals assembled with floss-like nanowires are synthesized via a hydrothermal process and used as an active material for supercapacitors.

scholarly journals Fabrication of High-Performance Flexible Supercapacitor Electrodes with Poly(3,4-ethylenedioxythiophene) (PEDOT) Grown on Carbon-Deposited Polyurethane Sponge

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7393
Author(s):  
Linyue Tong ◽  
Laura A. Sonnenberg ◽  
Wei Wu ◽  
Steven M. Boyer ◽  
Maggie T. Fox ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
High Performance ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Low Cost ◽  
Active Material ◽  
Electrical Performance ◽  
Polymerization Temperature ◽  
Composite Electrodes ◽  
Graphene Nanoplatelet

Composite porous supercapacitor electrodes were prepared by growing poly(3,4-ethylenedioxythiophene) (PEDOT) on graphite nanoplatelet- or graphene nanoplatelet-deposited open-cell polyurethane (PU) sponges via a vapor phase polymerization (VPP) method. The resulting composite supercapacitor electrodes exhibited great capacitive performance, with PEDOT acting as both the conductive binder and the active material. The chemical composition was characterized by Raman spectroscopy and the surface morphology was characterized by scanning electron microscopy (SEM). Cyclic voltammetry (CV), charge-discharge (CD) tests and electrochemical impedance spectroscopy were utilized to study the electrical performance of the composite electrodes produced in symmetrically configured supercapacitor cells. The carbon material deposited on PU substrates and the polymerization temperature of PEDOT affected significantly the PEDOT morphology and the electrical properties of the resulting composite sponges. The highest areal specific capacitance 798.2 mF cm−2 was obtained with the composite sponge fabricated by VPP of PEDOT at 110 °C with graphene nanoplatelet-deposited PU sponge substrate. The capacitance retention of this composite electrode was 101.0% after 10,000 charging–discharging cycles. The high flexibility, high areal specific capacitance, excellent long-term cycling stability and low cost make these composite sponges promising electrode materials for supercapacitors.

Core–shell structural PANI-derived carbon@Co–Ni LDH electrode for high-performance asymmetric supercapacitors

2018 ◽  
Vol 2 (6) ◽  
pp. 1350-1355 ◽  
Author(s):  
Junming Cao ◽  
La Li ◽  
Yunlong Xi ◽  
Junzhi Li ◽  
Xuexue Pan ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Specific Capacitance ◽  
Double Layer ◽  
High Performance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Core Shell ◽  
Asymmetric Supercapacitors ◽  
Double Layer Capacitor ◽  
Metal Nanocomposites

Carbon/metal nanocomposites have been considered promising electrode materials for application in supercapacitors owing to their combination of good electrical conductivity, excellent cycle stabilities of the electronic double layer capacitor (EDLC) and high specific capacitance of the pseudocapacitor.

scholarly journals Advanced binder-free electrodes based on CoMn2O4@Co3O4 core/shell nanostructures for high-performance supercapacitors

RSC Advances ◽  
2018 ◽  
Vol 8 (55) ◽  
pp. 31594-31602 ◽  
Author(s):  
Xiaobo Chen ◽  
Xiao Liu ◽  
Yongxu Liu ◽  
Yameng Zhu ◽  
Guoce Zhuang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
High Performance ◽  
High Specific Capacitance ◽  
Cycling Stability ◽  
Core Shell ◽  
Ni Foam ◽  
Asymmetric Supercapacitors ◽  
Shell Nanostructures ◽  
Binder Free

CoMn2O4@Co3O4 core/shell arrays on Ni foam exhibit outstanding electrochemical performance for asymmetric supercapacitors with respect to high specific capacitance and high cycling stability.

scholarly journals Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 924 ◽  
Author(s):  
Hsin-Ya Chiu ◽  
Chun-Pei Cho
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Specific Capacitance ◽  
Active Material ◽  
Mixed Phase ◽  
Ionic Diffusion ◽  
Mass Loading ◽  
Asymmetric Supercapacitors ◽  
Active Materials ◽  
X Ray

MnO2/N-containing graphene composites with various contents of Mn were fabricated and used as active materials for the electrodes of flexible solid-state asymmetric supercapacitors. By scanning electron microscopes (SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectrometer (XPS), fourier-transform infrared spectroscopy (FTIR) and Raman spectra, the presence of MnO2 and N-containing graphene was verified. The MnO2 nanostructures decorated on the N-containing graphene were of α- and γ-mixed phases. N-containing graphene was found to reduce the charge transfer impedance in the high-frequency region at the electrode/electrolyte interface (RCT) due to its good conductivity. The co-existence of MnO2 and N-containing graphene led to a more reduced RCT and improved charge transfer. Both the mass loading and content of Mn in an active material electrode were crucial. Excess Mn caused reduced contacts between the electrode and electrolyte ions, leading to increased RCT, and suppressed ionic diffusion. When the optimized mass loading and Mn content were used, the 3-NGM1 electrode exhibiting the smallest RCT and a lower ionic diffusion impedance was obtained. It also showed a high specific capacitance of 638 F·g−1 by calculation from the cyclic voltammetry (CV) curves. The corresponding energy and power densities were 372.7 Wh·kg−1 and 4731.1 W·kg−1, respectively. The superior capacitance property arising from the synergistic effect of mixed-phase MnO2 and N-containing graphene had permitted the composites promising active materials for flexible solid-state asymmetric supercapacitors. Moreover, the increase of specific capacitance was found to be more significant by the pseudocapacitive MnO2 than N-containing graphene.

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