Relationships between pore size and charge transfer resistance of carbon aerogels for organic electric double-layer capacitor electrodes

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

doi:10.1016/j.electacta.2016.11.177

Cited by 140 publications

(68 citation statements)

References 59 publications

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“…In order to obtain the maximum double‐layer capacitance, the ion size in the electrolyte should be close to the pore size of the electrode material. In the process of low‐rate charge and discharge, ionic electrolyte is easier to transfer in the pores with large sizes, making full use of the surface area of carbon . A certain amount of mesopores and macropores can be necessary for the rapid diffusion of electrolyte ions, which not only can effectively improve the accessibility of micropores, also serve as a channel for rapid diffusion of ions, promoting the rapid transport of electrolyte ions, thereby greatly improving electrochemical performance of SCs .…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…In addition, some characteristics of CAs such as SSA, pore structure tend to control and modify. The parameters such as gel process, activation, pyrolysis temperature, and so on, all have great influence on the characteristics of CAs, which is beneficial to the design of CAs structure according to the actual application . For example, Yang et al obtained CAs with different SSA and pore structure by controlling different R/C ratios.…”

Section: Biomass‐based Carbon For Electrode Materialsmentioning

confidence: 99%

“…In the process of low-rate charge and discharge, ionic electrolyte is easier to transfer in the pores with large sizes, making full use of the surface area of carbon. 87 A certain amount of mesopores and macropores can be necessary for the rapid diffusion of electrolyte ions, which not only can effectively improve the accessibility of micropores, also serve as a channel for rapid diffusion of ions, promoting the rapid transport of electrolyte ions, thereby greatly improving electrochemical performance of SCs. 159,160 Mi et al 34 observed the equivalent series resistance decreased with the increase of V meso /V total of the porous carbons, which led to a high capacitance.…”

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confidence: 99%

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The synthesis and performance analysis of various biomass‐based carbon materials for electric double‐layer capacitors: A review

Lin

et al. 2019

Int J Energy Res

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Summary Biomass is one of the most promising clean energy sources. The porous carbon materials prepared by biomass as electrode materials of electric double‐layer capacitors (EDLCs) are easily available at a low price, which would greatly reduce the cost of the production. However, carbon materials made with biomass generally have many disadvantages such as low specific surface area (SSA), poor pore size structure, and difficulty to control the pore diameter, which results in the poor EDLC performance. In this paper, the prime purpose is to expose the recent progress of biomass carbon in the fields of electrode materials of EDLC. The review provides a comprehensive literature review that is focused on EDLC electrodes derived from biochar of the evidence of 181 publications published over a period of 30 years from 1989 to 2019. Various carbon materials derived from different biomass for electrode of EDLC are discussed. The most promising methods for the preparation of several biomass carbons are described in detail. Some factors such as SSA, pore size structure, surface functional groups, and electrolyte are further analyzed to discuss the effects on the electrochemical performance of the EDLC. Notably, current deficiencies and possible solutions of preparation methods of biomass carbon as electrode materials are outlined. And the future research trends in this field are prospected.

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Section: Analysis and Discussionmentioning

confidence: 99%

Section: Biomass‐based Carbon For Electrode Materialsmentioning

confidence: 99%

mentioning

confidence: 99%

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The synthesis and performance analysis of various biomass‐based carbon materials for electric double‐layer capacitors: A review

Lin

et al. 2019

Int J Energy Res

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“…This observation is due to the presence of high faradaic charge transfer resistance (Rct) and low oxygen surface functionalities which increases the hydrophobicity of O-rLGO-6.5. The increase of Rp also results from the high diffusion resistance (Rd) of O-rLGO-6.5 which emanates from the low admittance of electrolyte through its compact structure of small micro-slits and meso-channels [41][42][43][44]. At low frequencies, ions have sufficient time to diffuse and travel further within the matrix of the O-rLGO resulting in more imaginary impedance (i.e., reactance).…”

Section: Ions Diffusion Analysis Of O-rlgos In a Neutral Electrolytementioning

confidence: 99%

Oriented Graphene Based Electrochemical Supercapacitor

Lyu¹,

Mayyas²,

Salim³

et al. 2019

Preprint

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Graphene has attracted substantial interest as potential carbon electrode material for energy storage applications. Yet, the utility of this material for these applications is governed by its stability and microstructure (i.e., surface area and porosity). Graphene can be prepared in controlled orientation by changing the surface chemistry of GO flakes in suspensions via reduction which causes the graphene to coagulate and self-assemble in specific patterns. Tuning the structure and porosity of oriented graphene is possible by varying the synthesis conditions. Herein, we report the growth of oriented graphene from a relatively small flake size GO suspension. The prepared electrode material demonstrated an excellent electrochemical performance with a supercapacitance value of 195 F g -1 at 1 mV s -1 and low real impedance with good stability and integrity after 4000 cycles of continuous chargedischarge in 1 M KOH electrolyte. This excellent performance is due to the unique architecture of the oriented graphene which comprises micro-slits and meso-channels among the sheets. The meso-channels were suggested to allow rapid diffusion of charge carriers and ions while the micro-slits increase more surface area for electrochemical interactions per unit volume. The observations reported herein create a new understanding of the structure-stabilityperformance trade-off in oriented graphene and layout the foundation for further investigations on their sustainable utilization in energy storage applications.

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“…The general catalyst trend in carbon gels formation is to increase in average pore size and total pore volume using possibly smallest amount of catalyst i.e. high R/C ratio [20]. At higher amount of catalyst results bigger amount of clusters are produced in addition reaction, and consequently pore size diameter is diminished.…”

Section: Introductionmentioning

confidence: 99%

Lithium perrhenate catalyst for carbon aerogel-based supercapacitor

et al. 2020

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Carbon aerogels are unique type of amorphous carbon-based materials with an extraordinary properties including light weight, well-developed and tailored pore structure, high specific surface area, low electrical resistivity and high purity. Therefore carbon aerogels can be used in numerous applications, including energy storage materials such as supercapacitors or lithium-ion batteries. Synthesis of hydrogel requires accurate concentration of monomers and catalysts, exact temperature and time. Low-density carbon aerogel can be produced using a complicated supercritical drying method, which allows to expel solvent without carbon porous structure collapse. Here we report a possibility to use novel type of resorcinol/formaldehyde gelation catalyst based on rhenium salt. The organic gel obtained using lithium perrhenate was traditionally carbonized and examined with respect to energy storage properties. It was found that interaction of lithium and rhenium atoms with monomers resulted in completely different structure than using typical sodium carbonate catalyst.

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Relationships between pore size and charge transfer resistance of carbon aerogels for organic electric double-layer capacitor electrodes

Cited by 140 publications

References 59 publications

The synthesis and performance analysis of various biomass‐based carbon materials for electric double‐layer capacitors: A review

The synthesis and performance analysis of various biomass‐based carbon materials for electric double‐layer capacitors: A review

Oriented Graphene Based Electrochemical Supercapacitor

Lithium perrhenate catalyst for carbon aerogel-based supercapacitor

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