Carbon Quantum Dots/Polyaniline Nanocomposite (S-CQD/PANI) for High Capacitive Asymmetric Supercapacitor Device

2020 ◽  
Vol 20 (6) ◽  
pp. 3785-3794 ◽  
Author(s):  
Manohar D. Mehare ◽  
Abhay D. Deshmukh ◽  
S. J. Dhoble
Keyword(s):  
Quantum Dots ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Aqueous Electrolyte ◽  
Carbon Quantum Dots ◽  
Electrode System ◽  
Potential Range ◽  
Asymmetric Supercapacitor ◽  
Supercapacitor Application ◽  
Excellent Stability

A sucrose derived carbon quantum dots/polyaniline (S-CQD/PANI) nanocomposite was synthesized as electrode materials by electrodeposition method to achieve excellent electrocapacitive performance for supercapacitor application. The morphology reveals that CQD were distributed uniformly over the surface of PANI. The highest specific capacitance obtained to be 1512.4 Fg−1 at current density 1 Ag−1 for S-CQD/PANI-25 composite in three electrode system with 1 M H2SO4 aqueous electrolyte within the potential range of −0.2 to 0.8 V. In addition asymmetric supercapacitor device was fabricated reveals highest specific capacitance of 295 Fg−1 at 1 Ag−1 with excellent stability over 1000 cycle at 3 Ag−1. Remarkably, the device delivers energy density of 40.86 Whkg−1 at power density 2000 Wkg−1.

scholarly journals Preparation and Electrochemical Properties of Functionalized Multi-Walled Carbon Nanotubes @ Carbon Quantum Dots @ Polyaniline Ternary Composite Electrode Materials

2020 ◽  
Vol 10 (16) ◽  
pp. 5462
Author(s):  
Jing Wang ◽  
Youyang Chen ◽  
Zhihao Hu ◽  
Ye Ge ◽  
Guotao Dong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Field Emission ◽  
Electrode Materials ◽  
Carbon Quantum Dots ◽  
Constant Current ◽  
Ternary Composite

Based on various carbon nano materials, the ternary composite functionalized carbon nanotubes (FMWCNTs) @ carbon quantum dots (CQDs) @ polyaniline (PANI) was prepared by in-situ polymerization and hydrothermal method. The carbon-based material was made into an electrode sheet. The morphology and microscopic nanostructures were characterized by FTIR, field emission scanning electron microscopy and field emission transmission electron microscopy. Cyclic voltammetry and the galvanostatic charge discharge method was adapted to study the electrochemical properties of these active materials. Our results showed that the specific capacitance of FMWCNTs @ CQDs @ PANI was as high as 534 F/g, while it was 362 F/g, 319 F/g and 279 F/g for PANI @ FMWCNTs, PANI @ CQDs and polyaniline. This means that the specific capacitance of FMWCNTs @ CQDs @ PANI is increased by 47.5%, 67.4% and 91.4% comparing with the capacitance of PANI @ FMWCNTs, PANI @ CQDs and polyaniline, respectively. Moreover, the specific capacitance retention rate of the ternary active electrode after 1000 times of constant current charge and discharge cycle reached 86%, while it was 60% for PANI @ FMWCNTs, 72% for PANI @ CQDs and 65% for polyaniline.

3D hierarchical porous N-doped carbon quantum dots/vanadium nitride hybrid microflowers as a superior electrode material toward high-performance asymmetric capacitive deionization

2021 ◽  
Author(s):  
Jingxuan Zhao ◽  
Zhibo Zhao ◽  
Yang Sun ◽  
Xiangdong Ma ◽  
Meidan Ye ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electrode Material ◽  
High Performance ◽  
Carbon Nanomaterials ◽  
Electrode Materials ◽  
Carbon Quantum Dots ◽  
Vanadium Nitride ◽  
Capacitive Deionization ◽  
Hierarchical Porous

Taking into account of time-confusing preparation processing and unsatisfied desalination capacity of carbon nanomaterials, exploring efficient electrode materials remains a great challenge for practical capacitive deionization (CDI) application. In this...

Hybrid nanostructured C-dot decorated Fe3O4electrode materials for superior electrochemical energy storage performance

2015 ◽  
Vol 44 (19) ◽  
pp. 9221-9229 ◽  
Author(s):  
K. Bhattacharya ◽  
P. Deb
Keyword(s):  
Quantum Dots ◽  
Energy Storage ◽  
Specific Capacitance ◽  
High Specific Capacitance ◽  
Carbon Quantum Dots ◽  
Electrochemical Energy Storage ◽  
The Novel ◽  
Hybrid Nanocomposite ◽  
Storage Performance ◽  
Electrochemical Energy

Here, the novel Fe3O4-C hybrid nanocomposite demonstrates high specific capacitance (S.C.) than the pristine Fe3O4nanospheres due to the presence of the highly conducting carbon quantum dots.

scholarly journals Stable Copper Tin Sulfide Nanoflower Modified Carbon Quantum Dots for Improved Supercapacitors

2019 ◽  
Vol 2019 ◽  
pp. 1-5 ◽  
Author(s):  
Zhen Bi ◽  
Lanyan Huang ◽  
Chaoqun Shang ◽  
Xin Wang ◽  
Guofu Zhou
Keyword(s):  
Quantum Dots ◽  
Volume Change ◽  
Electrode Materials ◽  
Rate Capability ◽  
Carbon Quantum Dots ◽  
High Rate ◽  
Electrochemical Performances ◽  
Tin Sulfide ◽  
Transmission Electron ◽  
Tin Sulfides

Copper tin sulfides (CTSs) have widely been investigated as electrode materials for supercapacitors owing to their high theoretical pseudocapacitances. However, the poor intrinsic conductivity and volume change during redox reactions hindered their electrochemical performances and broad applications. In this study, carbon quantum dots (CQDs) were employed to modify CTSs. The structures and morphologies of obtained materials were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD revealed CTSs were composed of Cu2SnS3 and Cu4SnS4, and TEM suggested the decoration of CQDs on the surface of CTSs. With the decoration of CQDs, CTSs@CQDs showed a remarkable specific capacitance of 856 F·g−1 at 2 mV·s−1 and a high rate capability of 474 F·g−1 at 50 mV·s−1, which were superior to those of CTSs (851 F·g−1 at 2 mV·s−1 and 192 F·g−1 at 50 mV·s−1, respectively). This was mainly ascribed to incorporation of carbon quantum dots, which improved the electrical conductivity and alleviated volume change of CTSs during charge/discharge processes.

Novel Electrode Materials for Ultracapacitors:Structural and Electrochemical Properties of Sol-Gel-Derived Manganese Dioxide Thin Films

1999 ◽  
Vol 575 ◽  
Author(s):  
Suh-Cern Pang ◽  
MarcA Anderson
Keyword(s):  
Thin Films ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Sol Gel ◽  
High Specific Capacitance ◽  
Potential Range ◽  
Proton Mobility ◽  
Reversible Redox ◽  
Sol Gel Process ◽  
Nickel Substrates

ABSTRACTNanoparticulate MnO2thin films fabricated by the sol-gel process have been shown to be an outstanding novel electrode material for Ultracapacitors. The average specific capacitance of sol-gel-derived MnO2thin-films on nickel substrates as determined by cyclic voltammetry ranged from 566 to 698 F/g. These films also exhibited good cycling stability within the potential range of 0.0-0.9V (vs SCE) in unbuffered aqueous electrolyte. Both CV and XPS studies showed that MnO2films have remained chemically and structurally intact after 1,500 cycles. The XRD spectra and SEM micrographs showed that the microstructure of MnO2thin films are highly porous, and poorly crystalline or amorphous in nature. The high specific capacitance of MnO2may be predominantly due to pseudocapacitance associated with homogenous and reversible redox reactions of proton insertion into and out of the MnO2lattice. Any variation in the microstructure and thickness of films might affect proton mobility within the oxide matrix and thereby affecting their cycling behaviors. Further optimization of the cycling behaviors is envisaged with better microstructural and thickness control of these sol-gelderived nanoparticulate MnO2thin films.

Carbon quantum dots anchoring MnO 2 /graphene aerogel exhibits excellent performance as electrode materials for supercapacitor

2018 ◽  
Vol 398 ◽  
pp. 167-174 ◽  
Author(s):  
Haipeng Lv ◽  
Yue Yuan ◽  
Qunjie Xu ◽  
Haimei Liu ◽  
Yong-Gang Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electrode Materials ◽  
Carbon Quantum Dots ◽  
Excellent Performance ◽  
Graphene Aerogel

scholarly journals Supercapacitors with graphene coated paper electrodes

2012 ◽  
Vol 27 (2) ◽  
pp. 481-485 ◽  
Author(s):  
Britta Andres ◽  
Sven Forsberg ◽  
Ana Paola Vilches ◽  
Renyun Zhang ◽  
Magnus Hummelgård ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Gold Nanoparticle ◽  
Electrode Materials ◽  
Aqueous Electrolyte ◽  
Minor Effect ◽  
Graphite Foil ◽  
Coated Paper ◽  
A Minor

Abstract Paper based supercapacitors are prepared by stacking a paper between two graphene electrodes and soaking these in an aqueous electrolyte. We demonstrate that supercapacitors can easily be manufactured by using proven paper technologies. Several different electrode materials were compared and two types of contacting material, silver and graphite foil were tested. The influence of the paper used as separator was also investigated. The supercapacitors with a graphene-gold nanoparticle composite as electrodes showed a specific capacitance of up to 100 F/g and an energy density of 1.27 Wh/kg. The energy density can further be increased by using other electrolytes. The silver contacts showed a pseudo capacitance, which the graphite contacts did not. The papers tested had a minor effect on the capacitance, but they have an influence on the weight and the volume of the supercapacitor.

Preparation of hierarchically porous carbon nanofoams for electrode materials of supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70297-70301 ◽  
Author(s):  
Yong Zhang ◽  
Youfu Wang ◽  
Aiguo Hu
Keyword(s):  
Specific Capacitance ◽  
Porous Carbon ◽  
Electrode Materials ◽  
Aqueous Electrolyte ◽  
Core Shell ◽  
Hierarchically Porous

Hierarchically porous carbon nanofoams were prepared via the formation of core–shell organosilica nanoparticles and subsequent Friedel–Crafts chemistry. The specific capacitance of them as electrode materials reached 170 F g−1 in an aqueous electrolyte.

Preparation of sulfur-doped carbon quantum dots from lignin as a sensor to detect Sudan I in an acidic environment

2020 ◽  
Vol 8 (47) ◽  
pp. 10788-10796
Author(s):  
Xiaoxu Yang ◽  
Yanzhu Guo ◽  
Shuang Liang ◽  
Shiyao Hou ◽  
Tingting Chu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantitative Evaluation ◽  
Ph Value ◽  
Carbon Quantum Dots ◽  
Acidic Environment ◽  
Sudan I ◽  
Acidic Environments ◽  
Excellent Stability ◽  
Fluorescent Carbon

To achieve a rapid and facile quantitative evaluation of Sudan I illegally added in ketchup, fluorescent carbon quantum dots with excellent stability in acidic environments are required as the actual pH value of ketchup is close to 4.0.

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