Ionic liquids for hybrid supercapacitors

Balducci, Andrea; Bardi, Ugo; Caporali, Stefano; Mastragostino, Marina; Soavi, Francesca

doi:10.1016/j.elecom.2004.04.005

Cited by 295 publications

(160 citation statements)

References 12 publications

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“…However, conventional EDLCs have low energy density. Hence, EDLCs have been actively investigated to obtain both high power and energy density [1][2][3]. This might be achieved by using carbon materials with a large surface area and adaptable nanopore widths and ions as electrodes.…”

Section: Introductionmentioning

confidence: 99%

Local Ordered Structure of Propylene Carbonate in Slit-Shaped Carbon Nanopores by GCMC Simulation

Ohba

Kaneko

Kanoh

2011

ISRN Nanotechnology

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An electric double-layer capacitor (EDLC) has high potential for storing electrical energy at a high power density. It was reported that a narrow nanopore system provides higher performance of EDLCs. In such a system, propylene carbonate (PC) is generally used as a solvent in EDLCs. Hence, the structure of PC in the slit-shaped carbon nanopores should be investigated to reveal the EDLC mechanism. In this paper, grand canonical Monte Carlo simulation of PC adsorbed in nanopores was performed to elucidate molecular-level understanding of the influence of PC on the EDLC performance. PC molecules have a highly ordered structure and longer intermolecular distances in nanopores of a pore width less than 0.7 nm. Thus, the highly ordered and low-density structure formation of the adsorbed PC molecules in narrow nanopores provides a permeation path for electrolytes through nanopores, indicating high-performance EDLCs.

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Section: Introductionmentioning

confidence: 99%

Local Ordered Structure of Propylene Carbonate in Slit-Shaped Carbon Nanopores by GCMC Simulation

Ohba

Kaneko

Kanoh

2011

ISRN Nanotechnology

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“…It is possible to overcome the ILs viscosity by operating the capacitor at higher temperature. 20 A rapid increase of conductivity with temperature for a few ionic liquids with different anions is presented in Figure 10.…”

Section: Ionic Liquids As Electrolyte For Supercapacitormentioning

confidence: 99%

Supercapacitors based on carbon materials and ionic liquids

Frąckowiak¹

2006

J. Braz. Chem. Soc.

111

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Este artigo descreve o desempenho de supercapacitores construídos a partir de diferentes materiais de carbono. São descritos também o princípio geral de supercapacitor e a fórmula associada com sua operação. A função da nanotextura de carbono é enfatizada, selecionando carbonos preparados por técnicas de moldagem. Foi demonstrado que, principalmente, microporos e pequenos mesoporos são importantes para carregar a dupla camada elétrica, entretanto, a interligação de poros é crucial para a propagação de cargas. A presença de heteroátomo na rede de carbono, por exemplo nitrogênio, é útil por causa das reações faradaicas reversíveis adicionais. Foi encontrada uma dependência linear entre os valores de capacitância e a quantidade de nitrogênio. Líquidos iônicos são atualmente considerados como uma nova geração de eletrólitos com propriedades interessantes, por exemplo, alta voltagem de operação. Um aumento na voltagem de supercapacitores (acima de 3V) foi obtido pela aplicação de líquidos iônicos baseados em sais de fosfônio. This paper presents performance of supercapacitor built from different carbon materials. The general principle of supercapacitor and formula connected with its operation are also described. The role of carbon nanotexture has been underlined selecting carbons prepared by template techniques. It has been demonstrated that mainly micropores and small mesopores play important role for charging of electrical double layer, however, interconnectivity of pores is crucial for charge propagation. The presence of heteroatom, e.g. nitrogen in the carbon network is profitable because of additional reversible faradaic reactions. A linear dependence of capacitance values vs nitrogen content has been found. Ionic liquids are presently considered as a novel generation of electrolyte with interesting properties, e.g. a high operating voltage. An increase of supercapacitor voltage (over 3V) has been realized by application of ionic liquids based on phosphonium salt.

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“…Due to the excellent properties, ILs have been utilized as novel and promising materials in many research fields. For example, ILs can be utilized in energy conversion and energy storage, including solar cells [1][2][3][4][5][6][7], batteries [8][9][10][11][12][13][14][15][16], and supercapacitors [17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Measurements of ionic liquids thermal conductivity and thermal diffusivity

Zhao

Zhen

Jelle

et al. 2016

J Therm Anal Calorim

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Thermal conductivity and thermal diffusivity of ionic liquids (ILs) are investigated in this work. A hot disk method for ILs thermal conductivity and thermal diffusivity measurement is utilized. Firstly, the thermal conductivity of water is measured to check the reliability of the hot disk method. In addition, the thermal conductivity of pure ILs, including BmimBF4, BmimPF6, OmimCl, BmimFeCl4, and OmimFeCl4, is measured. By comparison with thermal conductivity values of water, BmimBF4, and BmimPF6 in the literatures, it is found that the thermal conductivity values of ILs using hot disk method has high reliability. Therefore, the hot disk method is utilized for thermal conductivity measurement of ILs in this work. The experimental results also show that all the average thermal conductivity values of the 5 pure ILs are no more than 0.1898 Wm -1 K -1 , which is much lower than the average measured thermal conductivity of water, namely 0.6033 Wm -1 K -1 . Effect of nanoparticles (NPs) on thermal conductivity of ILs is also investigated.It is shown that the thermal conductivity of BmimBF4 does not change significantly in the presence of 2 diffusivity of water is 0.143 mm 2 s -1 in the literature. It illustrates that the ILs also have a better thermal property than water for energy storage. ILs may be utilized as novel materials for energy storage. Effect of NPs on thermal diffusivity of ILs is also investigated. The results are similar to how NPs influence thermal conductivity of BmimBF4 and BmimPF6. In the presence of Fe2O3 NPs, thermal diffusivity of BmimBF4 does not change significantly. However, in the presence of R711 NPs, thermal diffusivity of BmimPF6 decreases somewhat.

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Ionic liquids for hybrid supercapacitors

Cited by 295 publications

References 12 publications

Local Ordered Structure of Propylene Carbonate in Slit-Shaped Carbon Nanopores by GCMC Simulation

Local Ordered Structure of Propylene Carbonate in Slit-Shaped Carbon Nanopores by GCMC Simulation

Supercapacitors based on carbon materials and ionic liquids

Measurements of ionic liquids thermal conductivity and thermal diffusivity

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