Capacitive behavior of activated carbons obtained from coffee husk

Ramirez, Nathalia; Sardella, Fabiana; Deiana, Cristina; Schlosser, Anja; Müller, Dennis; Kißling, Patrick A.; Klepzig, Lars F.; Bigall, Nadja C.

doi:10.1039/d0ra06206e

Cited by 30 publications

(17 citation statements)

References 41 publications

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“…Figure 2b shows the corresponding element mapping, demonstrating the homogeneous dispersion of C, N and O elements in NGC, which about 4.7 wt % of N element (Figure S6) was doped into the NGC. Compared with the carbonized coconut shell (Figure S4) and other reported natural carbon resources previously [21][22][23], the electrical conductivity of NGC was enhanced due to the presence of nitrogen. The porous framework of NGC was confirmed by TEM as shown in Figure 2c and Figure S5, even though the NGC kept the shape of carbonized coconut shell.…”

Section: Resultsmentioning

confidence: 71%

Modified Separator with Nitrogen‐doped High‐graphitized Carbon for Lithium‐sulfur Batteries

et al. 2022

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Suppressing the shuttling of dissolved lithium polysulfides (LiPSs) is an indispensable strategy to extend the cycling life of lithium-sulfur (LiÀ S) batteries. One strategy is absorbing the LiPSs by modifying separator of LiÀ S batteries. Herein, we show a novel nitrogen-doped graphitized carbon (NGC) derived from coconut shell, which was annealed by flash Joule heating at ultrahigh temperature within seconds. The NGC was coated on the polypropylene (PP) separator to prepare the modified PP separator, which enabled the LiÀ S batteries to work stably at 1 C with a low fading rate of 0.09 % from 788 mAh g À 1 . Microscopy analysis and Raman spectrum reveal that the high-graphitization carbon with heavily nitrogen-doping strengthens the adsorption of LiPSs in the charge/ discharge process.

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Section: Resultsmentioning

confidence: 71%

Modified Separator with Nitrogen‐doped High‐graphitized Carbon for Lithium‐sulfur Batteries

et al. 2022

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“…To evaluate the resistive properties of the examined carbon materials, EIS measurements were also performed in 6.0 M KOH in a three-electrode system ( Ramirez et al, 2020 ). The Nyquist plot of c-4CzPN–KOH is displayed in Figure 14 .…”

Section: Resultsmentioning

confidence: 99%

Development of Uniform Porous Carbons From Polycarbazole Phthalonitriles as Durable CO2 Adsorbent and Supercapacitor Electrodes

et al. 2022

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Advances in new porous materials have recognized great consideration in CO2 capture and electrochemical energy storage (EES) applications. In this study, we reported a synthesis of two nitrogen-enriched KOH-activated porous carbons prepared from polycarbazole phthalonitrile networks through direct pyrolysis protocol. The highest specific surface area of the carbon material prepared by pyrolysis of p-4CzPN polymer reaches 1,279 m2 g−1. Due to the highly rigid and reticular structure of the precursor, the obtained c-4CzPN–KOH carbon material exhibits high surface area, uniform porosity, and shows excellent CO2 capture performance of 19.5 wt% at 0°C. Moreover, the attained porous carbon c-4CzPN–KOH showed high energy storage capacities of up to 451 F g−1 in aqueous electrolytes containing 6.0 M KOH at a current density of 1 A g-1. The prepared carbon material also exhibits excellent charge/discharge cycle stability and retains 95.9% capacity after 2000 cycles, indicating promising electrode materials for supercapacitors.

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“…The measurements were performed by applying an amplitude of 10 mV in the frequency range from 0.1 Hz to 100 kHz. For the analysis of EIS data, the admittance were calculated as follows, [ 61,64 ]

A = \frac{1}{Z}, A = \frac{Z^{'}}{{‖ Z ‖}^{2}} - j \frac{Z^{″}}{{‖ Z ‖}^{2}},

where Z ′ is the real impedance, Z ″ is the imaginary impedance, and ‖ Z ‖ is the impedance module. In addition, the corresponding real and imaginary admittances were calculated as Z ′/‖ Z ‖ 2 = Y ′ and − Z ″/‖ Z ‖ 2 = Y ″.…”

Section: Methodsmentioning

confidence: 99%

Pd‐Doped Cellulose Carbon Aerogels for Energy Storage Applications

Ramirez

Zámbó

Sardella

et al. 2021

Adv Materials Inter

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In order to implement a sustainable approach in the development of carbonaceous materials with improved capacitive properties, the development of Pd‐doped cellulose carbon aerogels (CA‐PdX) is presented. Upon introducing Pd nanoparticles to the carbonaceous matrix prior to the gel formation, carbon aerogels with various Pd content are prepared. Physicochemical properties (such as texture, morphology, crystal structure, and surface chemistry) of CA‐PdX are revealed. Additionally, a comparative analysis in their electrochemical properties is performed to shed light on the effect of Pd incorporated into the matrices. It is found that Pd‐doping leads to the significant enhancement of power and energy densities (2.9‐fold and 55‐fold, respectively) compared to those of carbon aerogel without doping (CA‐Blank). The straightforward preparation method as well as the powerful control over the structure and composition pave the way toward the utilization of these hybrid materials in energy storage applications.

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Capacitive behavior of activated carbons obtained from coffee husk

Abstract: This paper analyzes the electrochemical and physicochemical properties of activated carbons developed from coffee husk through different activation routes.

Cited by 30 publications

References 41 publications

Modified Separator with Nitrogen‐doped High‐graphitized Carbon for Lithium‐sulfur Batteries

Modified Separator with Nitrogen‐doped High‐graphitized Carbon for Lithium‐sulfur Batteries

Development of Uniform Porous Carbons From Polycarbazole Phthalonitriles as Durable CO2 Adsorbent and Supercapacitor Electrodes

Pd‐Doped Cellulose Carbon Aerogels for Energy Storage Applications

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