Graphite-type activated carbon from coconut shell: a natural source for eco-friendly non-volatile storage devices

Keppetipola, Nilanka M.; Dissanayake, Maithri; Dissanayake, Pubudu; Karunarathne, Buddhika; Dourges, Marie-Anne; Talaga, David; Servant, Laurent; Olivier, Céline; Toupance, Thierry; Uchida, Satoshi; Tennakone, K.; Kumara, G.R.A.; Cojocaru, Ludmila

doi:10.1039/d0ra09182k

Cited by 97 publications

(56 citation statements)

References 35 publications

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“…Meanwhile, the peak detected at around 1600 cm –1 can be assigned to the G band, which is associated with the stretching modes of sp 2 -hybridized carbon atoms in the carbon rings or chains. 13 Moreover, the ratio of the integrated area of the D peak to that of the G peak ( I D / I G ) can reflect the degree of disorder of the carbonaceous materials. 13 The larger the I D / I G ratio, the higher the degree of disorder.…”

Section: Resultsmentioning

confidence: 99%

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Eco-Friendly Preparation of Biomass-Derived Porous Carbon and Its Electrochemical Properties

2022

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High-porosity activated carbon (AC) was prepared from low-cost coconut shells (CS) using KOH as an activating agent with different KOH/char mass ratios. To cut down the amount of KOH used for AC preparation, freezing pretreatment for a certain number of times was carried out on CS before carbonization, which resulted in the maximum increase in the specific surface area ( S BET ) and total pore volume of 92.8 and 44.4%, respectively, in the resultant biochar. For the sake of description, AC from CS undergoing x times of freezing pretreatment and with a KOH/char ratio of y is denoted as AC- xy . The S BET values of AC-13 and AC-24 are 193 and 166 m 2 g –1 larger than that of AC-05 (2217 m 2 g –1 ), respectively. At a current density of 0.25 A g –1 , the specific gravimetric capacitance ( C g ) values of AC-05, AC-13, and AC-24 are 386, 403, and 425 F g –1 . Moreover, a symmetric supercapacitor based on AC-24 exhibits a high energy density of 14.7 Wh kg –1 at a power density of 120 W kg –1 . The energy density retention rate of AC-24 is 71.1% with the power density increased by about 110 times, indicating excellent rate capability. Additionally, a capacitance retention rate of about 95% after 3000 cycles implies an outstanding cycle lifetime of an AC-24-based capacitor. The freezing strategy developed here provides a novel route for low-cost and eco-friendly production of AC from biomass wastes for high-performance supercapacitors.

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Section: Resultsmentioning

confidence: 99%

“… 13 Moreover, the ratio of the integrated area of the D peak to that of the G peak ( I D / I G ) can reflect the degree of disorder of the carbonaceous materials. 13 The larger the I D / I G ratio, the higher the degree of disorder. The I D / I G ratios of AC-13, AC-24, and AC-05 were 2.73, 2.96, and 3.07, respectively.…”

Section: Resultsmentioning

confidence: 99%

Eco-Friendly Preparation of Biomass-Derived Porous Carbon and Its Electrochemical Properties

2022

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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: 72%

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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“…It can be seen that continuous conducting paths provided by the infiltration of ionogel into the continuous voids of the IOC membranes are effective for achieving a solid-state, nonvolatile, and high-capacity EDLC. Keppetipola et al 36 reported the preparation of supercapacitor using polyethylene/ionic liquid, 1-methyl-1-propylpyrrolidinium bisfluorosulfonimide based separator membranes with graphite-type activated carbon electrodes with gives outstanding specific storage capability and energy-power handling. Shiraishi et al 37 have presented detailed investigations on the effects of the different porous structures of activated carbons on EDLC based on the ionic liquid, 1-ethyl-3-methyl imidazolium tetrafluoroborate.…”

Section: Introductionmentioning

confidence: 99%

Structural, thermal, and electrochemical studies of biodegradable gel polymer electrolyte for electric double layer capacitor

Chaurasia

Sharma

Singh

et al. 2022

High Performance Polymers

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A quasi-solid-state supercapacitor is fabricated using a biodegradable gel polymer electrolyte (GPE), and graphene nano-platelets (GNPs) capacitive electrodes. The GPE film comprises biodegradable polymer cellulose acetate (CA), ionic liquid, 1-ethyl-3-methylimidazolium thiocyanate (EMImSCN) and dopant salt potassium thiocyanate (KSCN). The polymeric gel films are prepared using the standard “solution cast technique” and characterized by using X-ray diffraction (XRD), Differential scanning calorimetry (DSC), Thermogravemetric analysis (TGA), Impedance spectroscopy, and Linear sweep voltammetry techniques. The synthesized GPE exhibits maximum room temperature ionic conductivity ∼1.2 x 10−3 S cm−1 and an electrochemical stability window of ∼2.4 V. The electrical double layer capacitor (EDLC) is configured by sandwiching the GPE film between two graphene nanoplatelets (GNPs) electrodes. The performance of the EDLC cell is evaluated in terms of specific capacitance, rate, and pulse power by using cyclic voltammetry, and electrochemical impedance measurement techniques.

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Graphite-type activated carbon from coconut shell: a natural source for eco-friendly non-volatile storage devices

Abstract: Simple ecofriendly activation process of carbon obtained from coconut shell-based waste was used for the fabrication of non-volatile high performance supercapacitors.

Cited by 97 publications

References 35 publications

Eco-Friendly Preparation of Biomass-Derived Porous Carbon and Its Electrochemical Properties

Eco-Friendly Preparation of Biomass-Derived Porous Carbon and Its Electrochemical Properties

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

Structural, thermal, and electrochemical studies of biodegradable gel polymer electrolyte for electric double layer capacitor

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