Activated Carbon Modified with Carbon Nanodots as Novel Electrode Material for Supercapacitors

Kumar, Vijay Bhooshan; Borenstein, Arie; Markovsky, Boris; Aurbach, Doron; Gedanken, Aharon; Talianker, M.; Porat, Ze’ev

doi:10.1021/acs.jpcc.6b04045

Cited by 77 publications

(45 citation statements)

References 38 publications

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“…Here, we present geometric area due to the simplicity and accuracy reasons. Capacitance values reported in the literature for surface decorated MnO 2 and carbon based materials including graphene and C-Dots vary between 0.08 and 50 µF/cm 2 , which is within the range that was obtained in this study 97 , 106 – 108 . Note that, gravimetric specific capacitance of the MnO 2 /PPy/C-Dots will be investigated in future works as well.…”

Section: Resultssupporting

confidence: 88%

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

Genç

Alaş

Harputlu

et al. 2017

Sci Rep

250

132

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Multi-colored, water soluble fluorescent carbon nanodots (C-Dots) with quantum yield changing from 4.6 to 18.3% were synthesized in multi-gram using dated cola beverage through a simple thermal synthesis method and implemented as conductive and ion donating supercapacitor component. Various properties of C-Dots, including size, crystal structure, morphology and surface properties along with their Raman and electron paramagnetic resonance spectra were analyzed and compared by means of their fluorescence and electronic properties. α-Manganese Oxide-Polypyrrole (PPy) nanorods decorated with C-Dots were further conducted as anode materials in a supercapacitor. Reduced graphene oxide was used as cathode along with the dicationic bis-imidazolium based ionic liquid in order to enhance the charge transfer and wetting capacity of electrode surfaces. For this purpose, we used octyl-bis(3-methylimidazolium)diiodide (C8H16BImI) synthesized by N-alkylation reaction as liquid ionic membrane electrolyte. Paramagnetic resonance and impedance spectroscopy have been undertaken in order to understand the origin of the performance of hybrid capacitor in more depth. In particular, we obtained high capacitance value (C = 17.3 μF/cm2) which is exceptionally related not only the quality of synthesis but also the choice of electrode and electrolyte materials. Moreover, each component used in the construction of the hybrid supercapacitor is also played a key role to achieve high capacitance value.

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Section: Resultssupporting

confidence: 88%

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

Genç

Alaş

Harputlu

et al. 2017

Sci Rep

250

132

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“…The report shows two distinguishable interplanar spacing of 0.21 and 0.20 nm which can be attributed to (100) and (011) graphite planes, respectively. These results come to an agreement with the previously reported of pristine CDs . While N@CDs were reported to have similar d‐spacing values as CDs, boron, and phosphorus were found to affecting the interplanar spacing of the CDs.…”

Section: Resultssupporting

confidence: 92%

One‐Pot Hydrothermal Synthesis of Elements (B, N, P)‐Doped Fluorescent Carbon Dots for Cell Labelling, Differentiation and Outgrowth of Neuronal Cells

Kumar

Friedman

et al. 2019

ChemistrySelect

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Here, we report the use of the chemically modified one-step facile hydrothermal process to develop Boron (B), Nitrogen (N), and Phosphorous (P) doped carbon dots (E@CDs). The chemical characterization of the E@CDs was systematically studied by several analytical techniques that confer doping of elements by known characteristics. The obtained E@CDs had observed very homogeneous size distribution and displayed excitation dependent fluorescence properties, and high quantum yield (QY) was measured in case of B and N doping. Excellent cell viability and good cellular uptake was observed for all E@CDs. Finally, E@CDs were compared with pristine CDs on their effect on cell labelling, neural differentiation process and outgrowth of neurite network. By manipulating the doping of CDs, we can control the branching pattern and outgrowth of neuronal developments. The E@CDs are capable due to their photostability biocompatibility, and possible selective affinity towards nanomedicine applications.[a] Dr.

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“…Nonetheless, they suffer from low energy density compared to batteries ,. The energy density of supercapacitors can be increased by widening the electrochemical window of the cells . For the energy of SCs, E , is proportional to the square of the cell voltage, according to the expression

E = \frac{1}{2} C V^{2}

, where C is the capacitance of the entire cell (the 2 electrodes together) and V is the cell voltage.…”

Section: Introductionmentioning

confidence: 99%

“…[1,2] The energy density of supercapacitors can be increased by widening the electrochemical window of the cells. [3][4][5][6][7][8][9][10][11][12][13] For the energy of SCs, E, is proportional to the square of the cell voltage, according to the expression E ¼ 1 2 CV 2 , where C is the capacitance of the entire cell (the 2 electrodes together) and V is the cell voltage. The voltage that can be applied to electrochemical cells such as SCs without changing the structure/composition of their components is usually limited by the electrolyte solution stability to oxidation and reduction.…”

Section: Introductionmentioning

confidence: 99%

A Surprising Failure Mechanism in Symmetric Supercapacitors at High Voltages

Borenstein

Attias²,

Hanna³

et al. 2017

ChemElectroChem

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Ionic liquids (ILs) are attractive candidates for high‐voltage electrochemical energy storage systems, owing to their high electrochemical stability. Recently, a unique eutectic mixture of ILs was reported to demonstrate outstanding performance in supercapacitor systems at low temperatures. Yet, many publications using this or similar IL mixtures reported only a limited voltage or cyclability when utilizing them with practical activated carbon electrodes. With supercapacitors consisting of symmetric electrodes, in which voltages higher than 3 V are applied, fast capacity fading and activity termination are observed. In order to exceed the limit of 3 V for supercapacitors that use electrolyte solutions possessing wide electrochemical windows, we thoroughly investigated the (unexpected) failure mechanism, using several analytical methods. This is the most important aspect of the paper. By this, we discovered a pronounced difference in the electrochemical behavior of the negative and the positive electrodes, which has significant implications on the operation of full symmetric cells at high voltages. Finally, we propose a solution that enables stable operation of cells up to 3.4 V. By balancing the mass of the electrodes, we prevent high‐voltage failure and control the voltage split to use the full electrochemical window of each electrode and obtain a higher cell voltage of 3.4 V and an energy density higher than 40 Wh/kg (of the electrode materials). The most important aspect of this work was a rigorous study of the failure mechanism.

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Activated Carbon Modified with Carbon Nanodots as Novel Electrode Material for Supercapacitors

Cited by 77 publications

References 38 publications

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

One‐Pot Hydrothermal Synthesis of Elements (B, N, P)‐Doped Fluorescent Carbon Dots for Cell Labelling, Differentiation and Outgrowth of Neuronal Cells

A Surprising Failure Mechanism in Symmetric Supercapacitors at High Voltages

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