Electrochemical Double‐Layer Capacitor based on Carbon@ Covalent Organic Framework Aerogels

Martín-Illán, Jesús Á; Sierra, Laura; Ocón, P.; Zamora, Félix

doi:10.1002/ange.202213106

Cited by 6 publications

(3 citation statements)

References 63 publications

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“…Since FrGO (1:4, 180 °C, 3 h) has a larger specific capacitance, it has a larger time constant than rGO (180 °C, 6 h) when the equivalent circuit resistance is similar. Compared with literature results (8.7 s for activated carbon, 8.5 s for carbon–MnO 2 material, and 2.1 s for COF aerogels), the values are much lower. ,, …”

Section: Resultscontrasting

confidence: 64%

“…In the Bode phase diagram of Figure S10, the phase angle value of FrGO (1:4, 180 °C, 3 h) and rGO (180 °C, 6 h) is ∼87.1°, which approximates the ideal capacitance of 90°. ,, Real capacitance C ′ and imaginary capacitance C ″ vs frequency (Hz) curves reflect the relaxation time ( t 0 ) and the maximum capacitance at a frequency of 0.1 Hz . According to eq , the resulting real capacitance C ′ vs frequency is shown in Figure S11.…”

Section: Resultsmentioning

confidence: 96%

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One-Step Synthesis of Fragment-Reduced Graphene Oxide as an Electrode Material for Supercapacitors

Yao,

Li,

Khainunni

et al. 2023

ACS Appl. Mater. Interfaces

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Section: Resultscontrasting

confidence: 64%

Section: Resultsmentioning

confidence: 96%

One-Step Synthesis of Fragment-Reduced Graphene Oxide as an Electrode Material for Supercapacitors

Yao,

Li,

Khainunni

et al. 2023

ACS Appl. Mater. Interfaces

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“…Thus, increasing the surface area and conductivity improves the efficiency of the energy storage mechanism. [6,7] With an increase in the number of active sites where electrolyte adsorption occurs, more charges are accumulated. [8] Conductive surfaces boost electrolyte transport for fast energy delivery.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline‐Coated Mesoporous Carbon Nanosheets with Fast Capacitive Energy Storage in Symmetric Supercapacitors

2023

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Polyaniline‐capped mesoporous carbon nanosheets with high conductivity and porosity are synthesized by vapor deposition polymerization. The mesoporous carbon template is prepared by removing ordered cubic iron oxide nanocrystals embedded in the carbon matrix obtained by thermal decomposition of an iron‐oleate complex in a sodium chloride matrix. The evaporated aniline monomers are slowly polymerized on the carbon surface pretreated with FeCl3 as an initiator, partially filling the carbon pores to improve conductivity. The resulting products exhibit efficient hybrid energy storage mechanisms of electric double‐layer capacitance and pseudocapacitance. When the nanosheets are assembled for a symmetric supercapacitor, the device capacitance reaches 107.8 F g−1, at a current density of 0.5 A g−1, and a capacitance retention of 69.6% is achieved at a ten times higher current density of 5 A g−1. Electrochemical impedance spectroscopy reveals that the transition from resistive to capacitive behavior occurs within 0.63 s, indicating that fast ion and charge transport results in high capacitance and rate capability. The corresponding energy and power densities are 9.59 Wh kg−1 and 200.1 W kg−1 at a current density of 0.5 A g−1, demonstrating efficient energy storage in a symmetric supercapacitor.

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Covalent Organic Frameworks for Capacitive Energy Storage: Recent Progress and Technological Challenges

Wang

Chen

et al. 2023

Adv Materials Technologies

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In principle, supercapacitors may store electrical energy through the electrical double-layer capacitance (EDLC), pseudocapacitance, or a mix of the above two. [3f ] EDLC stems from the electrostatically reversible electrolyte ion adsorption and desorption on electrode surfaces. [4] Therefore, electrodes with a large specific surface area and good electrical conductivity are essential to obtain a high EDLC. Carbon materials, such as activated carbon, [5] graphene, [6] and carbon nanotubes (CNTs), [7] are common EDLC materials due to their large specific surface area, high electrical conductivity, good cycling stability, and reasonably low cost. On the other hand, pseudocapacitance originates from rapid and reversible Faradaic reactions occurring on the surfaces of redox-active electrodes. [8] Common pseudocapacitive materials include transition metal oxides and conducting polymers. [9] Further, asymmetric hybrid capacitors combine electrodes with EDLC and pseudocapacitance to obtain broader operating potential windows and substantially higher energy density. [10] The properties of capacitive electrode materials govern the energy storage performance of supercapacitors. Extensive research efforts have been devoted to developing novel capacitive materials. These efforts have focused on two main strategies: 1) increasing the ion-accessible surface area of capacitive materials and 2) incorporating redox-active species to increase pseudocapacitance, achieving significant progress. For instance, a 3D graphene framework prepared by thermal decomposition exhibited a large specific surface area of 1018 m 2 g −1 and a high specific capacitance of 266 F g −1 at a current density of 0.5 A g −1 . [11] A nanoporous carbon sphere with an exceptional specific surface area of 3357 m 2 g −1 showed a specific capacitance of 405 F g −1 at 0.5 A g −1 . [12] Many studies have optimized the crystallinity, pore structure, and redox-active species of metal oxides/hydroxides and polymeric materials. [13] However, irregular pore structures, low electrical conductivity, uneven distribution of redox-active species in capacitive materials, and uncontrollable agglomeration of their nanoparticles often increase the mass transfer resistance of electrolyte ions and reduce their accessible surface areas, resulting in deteriorated energy storage performance. Further, metal dissolution and crystal structure transformation of metal oxides/hydroxides and fast degradation of polymeric materials also shorten the cycling life of supercapacitors fabricated using these materials. [14] Therefore, developing novel capacitive materials with Covalent-organic frameworks (COFs) are emerging organic crystalline materials with a porous framework that extends into two or three dimensions. Originating from their versatile and rigorous synthesis conditions, COFs have abundant and tunable pores, large and easily accessible surfaces, and plenty of redox-active sites, making them promising material candidates for various energy storage applications. One important area...

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Electrochemical Double‐Layer Capacitor based on Carbon@ Covalent Organic Framework Aerogels

Cited by 6 publications

References 63 publications

One-Step Synthesis of Fragment-Reduced Graphene Oxide as an Electrode Material for Supercapacitors

One-Step Synthesis of Fragment-Reduced Graphene Oxide as an Electrode Material for Supercapacitors

Polyaniline‐Coated Mesoporous Carbon Nanosheets with Fast Capacitive Energy Storage in Symmetric Supercapacitors

Covalent Organic Frameworks for Capacitive Energy Storage: Recent Progress and Technological Challenges

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