Three-dimensional α-Fe2O3/carbon nanotube sponges as flexible supercapacitor electrodes

2015 ◽  
Vol 3 (42) ◽  
pp. 20927-20934 ◽  
Author(s):  
Xiaoping Cheng ◽  
Xuchun Gui ◽  
Zhiqiang Lin ◽  
Yongjia Zheng ◽  
Ming Liu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Specific Capacitance ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Flexible Supercapacitor

The porous, flexible and compressible CNT@Fe2O3 sponges show high specific capacitance (>300 F g−1).

Three dimensional iron oxide/graphene aerogel hybrids as all-solid-state flexible supercapacitor electrodes

RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 58994-59000 ◽  
Author(s):  
Abdul Muqsit Khattak ◽  
Huajie Yin ◽  
Zahid Ali Ghazi ◽  
Bin Liang ◽  
Azhar Iqbal ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Solid State ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Graphene Aerogel ◽  
Flexible Supercapacitor

Three dimensional iron oxide/graphene aerogel hybrid (Fe2O3/GA) was synthesized and used as electrode materials in flexible supercapacitor devices, which show high specific capacitance of 440 F g−1 with 89% capacitance retention after 2200 cycles.

Three-Dimensional Graphene/MnO2 Nanowalls Hybrid for High-Efficiency Electrochemical Supercapacitors

NANO ◽  
2018 ◽  
Vol 13 (01) ◽  
pp. 1850013 ◽  
Author(s):  
Chuanyin Xiong ◽  
Tiehu Li ◽  
Tingkai Zhao ◽  
Alei Dang ◽  
Xianglin Ji ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Specific Capacitance ◽  
High Efficiency ◽  
Hydrogen Reduction ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Devices ◽  
3D Graphene

In this paper, a facile method is designed to fabricate three-dimensional (3D) graphene (GR)/manganese dioxide (MnO2) nanowall electrode material. The 3D GR/MnO2 hybrid is prepared by a combination of electrochemical deposition (ELD) and electrophoresis deposition (EPD), followed by thermal reduction (TR). Firstly, the 3D graphene oxide (GO)/MnO2 hybrid is obtained by the ELD–EPD method. Secondly, the 3D GR/MnO2 hybrid is obtained through hydrogen reduction at a certain temperature. The as-fabricated hybrid has been characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and Raman spectroscopy. The electrochemical properties have been also measured by cyclic voltammetry. The results showed that the 3D GR/MnO2 nanowalls hybrid has a high specific capacitance of 266.75[Formula: see text]Fg[Formula: see text] and a high energy density of 25.36[Formula: see text]Whkg[Formula: see text]. Moreover, a high specific capacitance (240.15[Formula: see text]Fg[Formula: see text]) at a high scan rate of 200[Formula: see text]mVs[Formula: see text] (90% capacity retention) has been also obtained. Additionally, the hybrid can serve directly as the electrodes of supercapacitor without adding binder. This work provides a novel road to fabricate a binder-free 3D GR-based hybrid for high-performance energy storage devices.

scholarly journals High Specific Capacitance of the Electrodeposited MnO2 on Porous Foam Nickel Soaked in Alcohol and its Dependence on Precursor Concentration

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 181 ◽  
Author(s):  
Ming Zhang ◽  
Xiaoli Dai ◽  
Cuixian Zhang ◽  
Yuanwu Fuan ◽  
Dingyu Yang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Specific Capacitance ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Retention Rate ◽  
Nickel Foam ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Manganese Acetate ◽  
Mixed Solution

In this work, we used the mixed solution of manganese acetate and sodium sulfate to deposit manganese dioxide on the three-dimensional porous nickel foam that was previously soaked in alcohol, and then the effects of solution concentrations on their capacitance properties were investigated. The surface morphology, microstructure, elemental valence and other information of the material were observed by scanning electron microscope (SEM), Transmission Electron Microscope (TEM), X-ray photoelectron spectroscopy (XPS), etc. The electrochemical properties of the material were tested by Galvanostatic charge-discharge (GCD), Cyclic Voltammetry (CV), Chronoamperometry (CA), Electrochemical impedance spectroscopy (EIS), etc. The MnO2 electrode prepared at lower concentrations can respectively reach a specific capacitance of 529.5 F g−1 and 237.3 F g−1 at the current density of 1 A g−1 and 10 A g−1, and after 2000 cycles, the capacity retention rate was still 79.8% of the initial capacitance, and the energy density can even reach 59.4 Wh Kg−1, while at the same time, it also has a lower electrochemical impedance (Rs = 1.18 Ω, Rct = 0.84 Ω).

Facile synthesis of exfoliated Co–Al LDH–carbon nanotube composites with high performance as supercapacitor electrodes

2014 ◽  
Vol 16 (33) ◽  
pp. 17936-17942 ◽  
Author(s):  
Lei Yu ◽  
Nannan Shi ◽  
Qi Liu ◽  
Jun Wang ◽  
Bin Yang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Specific Capacitance ◽  
High Performance ◽  
High Specific Capacitance ◽  
Cycle Stability ◽  
Facile Synthesis ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites

A novel sandwich-like structured Co–Al LDH–CNT composite has been successfully synthesized. The as-prepared Co–Al LDHs–CNTs composite exhibites a high specific capacitance and a good cycle stability over 2000 cycles

Facile synthesis of a Co3O4@carbon nanotubes/polyindole composite and its application in all-solid-state flexible supercapacitors

2015 ◽  
Vol 3 (24) ◽  
pp. 13011-13015 ◽  
Author(s):  
Xi Zhou ◽  
Anqi Wang ◽  
Yumei Pan ◽  
Chenfei Yu ◽  
Yun Zou ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Solid State ◽  
Specific Capacitance ◽  
High Specific Capacitance ◽  
Facile Synthesis ◽  
Flexible Supercapacitor ◽  
Flexible Supercapacitors

An all-solid-state flexible supercapacitor that achieves a high specific capacitance of 442.5 F g−1was facilely synthesized based on a Co3O4@carbon nanotubes/polyindole composite.

scholarly journals The Preparation of Carbon Nanotube/MnO2Composite Fiber and Its Application to Flexible Micro-Supercapacitor

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Li Li ◽  
Chen Chen ◽  
Jing Xie ◽  
Zehuai Shao ◽  
Fuxin Yang
Keyword(s):  
Cyclic Voltammetry ◽  
Carbon Nanotube ◽  
Specific Capacitance ◽  
Ultrathin Films ◽  
Electronic Devices ◽  
High Specific Capacitance ◽  
Composite Fiber ◽  
Potential Applications ◽  
Cyclic Voltammetry Method ◽  
Fiber Electrode

In recent years, flexible electronic devices pursued for potential applications. The design and the fabrication of a novel flexible nanoarchitecture by coating electrical conductive MWCNT fiber with ultrathin films of MnO2to achieve high specific capacitance, for micro-supercapacitors electrode applications, are demonstrated here. The MWCNT/MnO2composite fiber electrode was prepared by the electrochemical deposition which was carried out through using two different methods: cyclic voltammetry and potentiostatic methods. The cyclic voltammetry method can get “crumpled paper ball” morphology MnO2which has bigger specific capacitances than that achieved by potentiostatic method. The flexible micro-supercapacitor was fabricated by twisting two aligned MWCNT fibers and showed an area specific capacitance of 2.43 mF/cm2. The flexible micro-supercapacitors also enable promising applications in various fields.

A three-dimensional graphene aerogel containing solvent-free polyaniline fluid for high performance supercapacitors

Nanoscale ◽  
2017 ◽  
Vol 9 (45) ◽  
pp. 17710-17716 ◽  
Author(s):  
Zhaodongfang Gao ◽  
Junwei Yang ◽  
Jing Huang ◽  
Chuanxi Xiong ◽  
Quanling Yang
Keyword(s):  
Specific Capacitance ◽  
Conducting Polymer ◽  
High Performance ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Solvent Free ◽  
Graphene Aerogel ◽  
Term Stability ◽  
Long Term Stability

Conducting polymer based supercapacitors usually suffer from the difficulty of achieving high specific capacitance and good long-term stability simultaneously.

A high performance asymmetric supercapacitor based on in situ prepared CuCo2O4 nanowires and PPy nanoparticles on a two-ply carbon nanotube yarn

2018 ◽  
Vol 47 (47) ◽  
pp. 17146-17152 ◽  
Author(s):  
Xiao Liang ◽  
Qiufan Wang ◽  
Yun Ma ◽  
Daohong Zhang
Keyword(s):  
Carbon Nanotube ◽  
Energy Density ◽  
Specific Capacitance ◽  
High Performance ◽  
Negative Electrode ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitor

A two-ply CNT yarn asymmetric supercapacitor was fabricated by assembling a CuCo2O4 nanowire positive electrode and a PPy nanoparticle negative electrode. The full cell exhibits a high specific capacitance of 59.55 mF cm−2 and a high energy density of 0.02 mW h cm−2.

Approaching the theoretical capacitance of graphene through copper foam integrated three-dimensional graphene networks

2015 ◽  
Vol 3 (12) ◽  
pp. 6324-6329 ◽  
Author(s):  
Ramendra Sundar Dey ◽  
Hans Aage Hjuler ◽  
Qijin Chi
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Cost Effective ◽  
Copper Foam ◽  
Cost Effective Approach ◽  
Reduced Graphene

A facile and cost-effective approach to fabricate all-in-one supercapacitor electrodes is achieved with copper foam integrated three-dimensional reduced graphene oxide networks. The resulting electrodes display high specific capacitance close to the theoretical value of graphene and good charging–discharging stability.

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.

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