Pore size-controlled carbon aerogels for EDLC electrodes in organic electrolytes

Yang, Inchan; Kim, Sang-Gil; Kwon, Soon Hyung; Lee, Jun Hyup; Kim, Myung-Soo; Jung, Ji Chul

doi:10.1016/j.cap.2016.03.019

Cited by 44 publications

(23 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…of carbon nanomaterials such as carbon nanotubes [9] [10], carbons onions [11], and high porosity derived graphene [12], show more stable energy densities when the scan rate is increased, but not such a high specific capacity justifies a huge cost. Another option is to develop synthetic porous carbons such as zeolite-templated carbons [10], carbide-derived carbons [13,14] or carbon derived from sol-gel materials [15,16].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Determinant influence of the electrical conductivity versus surface area on the performance of graphene oxide-doped carbon xerogel supercapacitors

Ramos-Fernández

Canal-Rodríguez

Arenillas

et al. 2018

Carbon

View full text Add to dashboard Cite

A series of resorcinol formaldehyde based carbon xerogels were synthesized under identical conditions using different graphene oxide loads. The gelification reaction was carried out using a stable aqueous suspension of graphene oxide, yielding organic gels with graphene oxide concentrations ranging from 1.2 to 2.5%. After the carbonization, xerogels with medium surface area (650 m 2 /g) and a highly improved electrical conductivity were obtained. Specific capacitance of 120 F/g of one electrode at very high scan rate of 500 mV/s were achieved, as well as power densities above 30 kW/kg, which is a significant improvement of 180% with respect to the pristine xerogels. Carbonized xerogels were further steam activated to yield activated carbon xerogels with surface areas of up to 1800 m 2 /g. The use of activated xerogels improves slightly the specific capacitance at low scan rates only, and there is a sharp decrease above 20 mV/s, resulting in a worse performance than graphene oxide doped carbonized xerogels. The electrical conductivity of the graphene oxide-doped carbon xerogels decreases upon activation, which means that the influence of the electrical conductivity on a carbon xerogel is greater than its specific surface area, which it is is the first time it is observed for porous carbons.

show abstract

Section: Accepted Manuscriptmentioning

confidence: 99%

Determinant influence of the electrical conductivity versus surface area on the performance of graphene oxide-doped carbon xerogel supercapacitors

Ramos-Fernández

Canal-Rodríguez

Arenillas

et al. 2018

Carbon

View full text Add to dashboard Cite

show abstract

“…4b and c [25] and (ii) within the textural pores (i.e. inter-particle pores) of the AC electrodes [27,29]. As illustrated in Fig.…”

Section: Evolution Of Impedance With Temperature and Timementioning

confidence: 95%

“…In the case of the ionogels this resistance mainly corresponds to the ionic resistance within the silica structure. This is followed by the mid-range frequency semi-circle which has been assigned to a number of ionic and electrical components inside an EDLC: (a) intrinsic resistance of the electrode [27] , (b) electrical contact resistance between current collector and the electrode active material [27,28], (c) inter-particle ionic impedance [27,29], (d) ion transport processes [25] and (e) electrolyte starvation (in the case of low electrolyte concentration) [30,31]. Therefore, the dominating component influencing the charge transfer resistance (R ct , given by the diameter of the mid-range frequency semicircle) is dependent on the system being investigated.…”

Section: Evolution Of Impedance With Temperature and Timementioning

confidence: 99%

Fast-cure ionogel electrolytes with improved ion transport kinetics at room temperature

Janani

Mader

Roberts

et al. 2018

Journal of Power Sources

View full text Add to dashboard Cite

Fast-cure 1-ethyl-3-methylimidazolium trifluoromethanesulfonate based ionogels have been realised for the first time. The influence of curing temperature on the structure of ionogels and their performance as the electrolyte for electric doublelayer capacitors (EDLCs) has been investigated. Hybrid ionogels were synthesised via a non-hydrolytic sol-gel route and were fully gelled post heat-treating at 125, 150, 175 and 200 °C for 60 min with minimal shrinkage. Charge-transfer resistance (a rate-limiting parameter in cell kinetics during charge/discharge cycles) was reduced by ∼80% by increasing the heat-treatment temperature; this was partially attributed to the interlocking effect facilitated by high curing temperature. We report a maximum areal capacitance of 95 mF cm −2. Due to ∼40% increase in the penetrability coefficient of the ionic liquid, the electrode 'full' wetting time dropped from 48 to 5 h when the curing temperature was increased above 150 °C. These results were supported by SEM and Raman spectroscopy to characterise the effect of high temperature heat-treatment on the electrode-ionogel interface and the degree of electrode wetting by the ionic liquid. The fast-cure fabrication process for ionogels removes one of the major hurdles in their industrial application while the improved room temperature ion transport kinetics expands the potential application of ionic liquid-based electrochemical systems.

show abstract

“…The primary mechanism for the functioning of EDLCs depends on the pore walls of their materials. High porosity, and therefore a large surface area, is required to increase charge storage [ 11 , 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Activated Carbon Paper Electrodes Prepared by Rice Husk-Isolated Cellulose Fibers for Supercapacitor Applications

Kim

Kwac

et al. 2020

Molecules

View full text Add to dashboard Cite

For the preparation of activated carbon papers (APCs) as supercapacitor electrodes, impurity substances were removed from rice husks, before carbonization and various activation temperature treatments, to optimize electro chemical efficiency. The porosities and electrochemical performances of the ACPs depended strongly on activation temperature: The specific surface area increased from 202.92 (500 °C) to 2158.48 m2 g−1 (1100 °C). XRD and Raman analyses revealed that ACP graphitization also increased with the activation temperature. For activation at 1100 °C, the maximum specific capacitance was 255 F g−1, and over 92% of its capacitance was retained after 2000 cycles.

show abstract

Pore size-controlled carbon aerogels for EDLC electrodes in organic electrolytes

Cited by 44 publications

References 43 publications

Determinant influence of the electrical conductivity versus surface area on the performance of graphene oxide-doped carbon xerogel supercapacitors

Determinant influence of the electrical conductivity versus surface area on the performance of graphene oxide-doped carbon xerogel supercapacitors

Fast-cure ionogel electrolytes with improved ion transport kinetics at room temperature

Characterization of Activated Carbon Paper Electrodes Prepared by Rice Husk-Isolated Cellulose Fibers for Supercapacitor Applications

Contact Info

Product

Resources

About