Electric Double Layer Capacitance of Activated Carbon Nanofibers in Ionic Liquid: EMImBF4

Shiraishi, Soshi; Miyauchi, Takayuki; Sasaki, Rei; Nishina, Naoya; Ōya, Asao; Hagiwara, Rika

doi:10.5796/electrochemistry.75.619

Cited by 29 publications

(22 citation statements)

References 10 publications

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“…In spite of the significant research in ELDCs based on mesoporous carbons, such as carbon fibers, [28][29][30] single-and multi-walled carbon nanotubes, 19,[31][32][33] carbon onions, 19,27,[34][35][36][37] carbon aerogels 38,39 and graphene, [40][41][42] microporous carbon powders will likely remain a material of choice for the vast majority of commercial EDLC applications due to their higher volumetric capacitance, easier processing into thick electrodes and most commonly lower cost. 1,43,44 Among microporous carbons, advanced activated carbons (AC) 1,[44][45][46][47][48][49][50] and carbide derived carbons (CDC) 8,[51][52][53][54][55][56][57] have been investigated the most.…”

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confidence: 99%

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Moon

Kim

Lee

et al. 2015

J. Electrochem. Soc.

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Enhancement of the specific capacitance in electrochemical double layer capacitors (EDLCs) is of high interest due to the ever increasing demand for high power density energy storage devices. Zeolite templated carbon (ZTC) is a promising EDLC electrode material with large specific surface area and straight, ordered well-defined micropores. In this study, ZTC samples were synthesized using a low pressure chemical vapor deposition (LP CVD) of carbon on sacrificial zeolite Y powder using acetylene gas as a precursor. We demonstrate for the first time how various post-treatments of the produced samples can affect the ZTC microstructure and porosity and how such modifications may significantly improve electrochemical performance characteristics of the ZTC-based EDLC electrodes. The effects of CO 2 activation, ball milling and high temperature annealing process were systematically studied. The best performing samples achieved very large capacitance of over 240 Fg −1 at 1 mVs −1 in 1 M solution of tetraethylammonium tetrafluoroborate in acetonitrile and stable performance in symmetric EDLC devices with no noticeable degradation for over 20,000 cycles at a very high current density of 20 Ag Electrochemical double layer capacitors (EDLCs), also called supercapacitors and ultra-capacitors, have attracted extensive attention as EDLCs can provide high power delivery or update, high cycle efficiency, thermal stability, practically unlimited cycle life and relatively low cost of manufacturing.1 Furthermore, a wide operational temperature range and a relatively easy determination of the state of charge can be considered as additional advantageous aspects.1 Hence, there is an increasing growth in demand for EDLCs in industrial equipments, electronic devices, transportation market, and automotive applications.1-5 Yet, significantly smaller energy density (ca. 5 Wh kg −1 ) compared to the state of art rechargeable Li ion batteries (ca. 180 Wh kg −1 ) urgently calls for improvement in capacitance of EDLCs. 6,7 In addition, for some applications it is crucial to further increase the charge-discharge rate capability without deteriorating energy density characteristics. 1The value of the double layer capacitance formed at the electrode/ electrolyte interface (which directly impacts the energy density of EDLCs) is believed to depend on multiple factors, such as specific surface area (SSA) of the electrically conductive porous carbon electrodes, 1,8-11 pore size distribution (PSD) of the carbon electrodes (which may affect both the pore access by electrolyte ions and the solvation shell distortion and the resulting pore wall -ion separation distance), 1,3,9,12 electron density of states in carbon (which may affect the capacitance of the electrode side of the double layer), 13 electrolyte-carbon interfacial energy (which may affect electrolyte wetting in both large and sub-nm sized pores), 14,15 electrolyte-carbon interactions (which may impact electron density of states in carbon), 16 the presence of doping species within carbon (which...

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confidence: 99%

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Moon

Kim

Lee

et al. 2015

J. Electrochem. Soc.

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“…It has been reported that the double layer capacitance of porous carbon electrode in ionic liquid electrolyte is larger than that in conventional organic solvent ones. 21 The larger charge in this case is thus reasonable under such assumption. To be interesting, the redox currents for NiPc/CNT electrodes are larger and have higher resolution in EMIBF 4 than in TEABF 4 /PC.…”

Section: Resultsmentioning

confidence: 93%

Electrode Properties of Nickel Phthalocyanine/Carbon Nanotube Composite in Ionic Liquid Electrolyte

et al. 2013

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The compatibility of ionic liquid 1-ethyl-3-methyl imidazolium tetrafluroborate (EMIBF 4 ) with a redox capacitor system with redox species, nickel phthalocynine (NiPc) fixed at the interface between carbon nanotube (CNT) electrode and electrolyte has preliminarily been investigated. The redox of NiPc can be well reproduced by NiPc/CNT composite in EMIBF 4 electrolyte. The asymmetric cell with NiPc/CNT negative electrode with EMIBF 4 electrolyte exhibits significant contribution of redox charge on the cell capacitance even at high rate. The self-discharge behavior and electrolyte feature after long term charge-discharge reveal that the dissolution of NiPc is inhibited in EMIBF 4 electrolyte.

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“…Carbon nanofibers (CNFs) are currently investigated for a wide range of energy related applications such as electrodes in fuel cells [1][2][3], batteries [3,4], and supercapacitors [3,[5][6][7][8], as catalyst support [9,10], or sensors [11,12]. Another promising application for CNFs is hydrogen storage [13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage in CO2-activated amorphous nanofibers and their monoliths

Kunowsky

Marco-Lozar

Ōya

et al. 2012

Carbon

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Amorphous carbon nanofibers (CNFs), produced by the polymer blend technique, are activated by CO 2 (ACNFs). Monoliths are synthesized from the precursor and from some ACNFs. Morphology and textural properties of these materials are studied. When compared with other activating agents (steam and alkaline hydroxides), CO 2 activation renders suitable yields and, contrarily to most other precursors, turns out to be advantageous for developing and controlling their narrow microporosity (< 0.7 nm), V DR (CO 2 ). The obtained ACNFs have a high compressibility and, consequently, a high packing density under mechanical pressure which can also be maintained upon monolith synthesis. H 2 adsorption is measured at two different conditions (77 K / 0.11 MPa, and 298 K / 20 MPa) and compared with other activated carbons. Under both conditions, H 2 uptake depends on the narrow microporosity of the prepared ACNFs. Interestingly, at room temperature these ACNFs perform better than other activated carbons, despite their lower porosity developments. At 298 K they reach a H 2 adsorption capacity as high as 1.3 wt.%, and a remarkable value of 1 wt.% in its mechanically resistant monolith form.

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Electric Double Layer Capacitance of Activated Carbon Nanofibers in Ionic Liquid: EMImBF4

Cited by 29 publications

References 10 publications

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Electrode Properties of Nickel Phthalocyanine/Carbon Nanotube Composite in Ionic Liquid Electrolyte

Hydrogen storage in CO2-activated amorphous nanofibers and their monoliths

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