Coconut-Shell-Based Porous Carbons with a Tunable Micro/Mesopore Ratio for High-Performance Supercapacitors

Mi, Juan; Wang, Xiaorong; Fan, Rui-Jun; Qu, Wen-Hui; Li, Wen‐Cui

doi:10.1021/ef3009234

Cited by 253 publications

(135 citation statements)

References 56 publications

(73 reference statements)

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“…The weight loss above 400 °C was due to gradual decomposition of lignin. [25] A 32% char yield was observed at 700 °C which is much higher than that of other bioderived carbons. For example, jute rope showed a yield of 11%, while kapok fibers produced carbon with a 20% yield.…”

Section: Resultsmentioning

confidence: 86%

Eco‐Friendly and High Performance Supercapacitors for Elevated Temperature Applications Using Recycled Tea Leaves

et al. 2017

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energy supply are required. Hence, an efficient local energy storage/production system plays a vital role for such applications. [1] The supercapacitor is one of the efficient energy storage systems which can store energy via electric double layer and faradic reactions. [2,3] The electric double layer capacitor (EDLC) stores the charge over the active surface area of the material and shows very durable performance over long period. [3,4] Thus, creating carbon with a high surface area could be one of the ways to improve the performance of EDLC-based supercapacitor devices. There are several publications documenting the utilization of waste-derived carbon source such as seeds, seed shells, leaves, bagasse, waste paper, and tyre. [5][6][7][8][9][10][11][12] Waste tea is an additional exciting source for carbon. [13] Most of the time, an activation step is required to achieve the high surface area to enhance the performance of the carbon. Activation of waste-derived carbon can be done using various methods including chemical, steam, and CO 2 -based activation. [14][15][16][17] For example, steam activated carbon from fir wood showed an activated surface area of 1131 m 2 g −1 while, CO 2 activated empty fruit bunches of palm showed a surface area of 1704 m 2 g −1 . [12,13] KOH activation is the most popular way to create high surface area and Used tea leaves are utilized for preparation of carbon with high surface area and electrochemical properties. Surface area and pore size of tea leaves derived carbon are controlled by varying the amount of KOH as activating agent. The maximum surface area of 2532 m 2 g −1 is observed, which is much higher than unactivated tea leaves (3.6 m 2 g −1 ). It is observed that the size of the electrolyte ions has a profound effect on the energy storage capacity. The maximum specific capacitance of 292 F g −1 is observed in 3 m KOH electrolyte with outstanding cyclic stability, while the lowest specific capacitance of 246 F g −1 is obtained in 3 m LiOH electrolyte at 2 mV s −1 . The tea leaves derived electrode shows almost 100% capacitance retention up to 5000 cycles of study. The symmetrical supercapacitor device shows a maximum specific capacitance of 0.64 F cm −2 at 1 mA cm −2 and about 95% of specific capacitance is retained after increasing current density to 12 mA cm −2 , confirming the high rate stability of the device. An improvement over 35% in the charge storage capacity is seen when increasing device temperature from 10 to 80 °C. The study suggests that used tea leaves can be used for the fabrication of environment friendly high performance supercapacitor devices at a low cost.

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Section: Resultsmentioning

confidence: 86%

Eco‐Friendly and High Performance Supercapacitors for Elevated Temperature Applications Using Recycled Tea Leaves

et al. 2017

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“…Lignin pyrolyzes steadily over a wide temperature range, and the weaker peak between 430 and 500 °C may represent the decomposition of lignin. Lignin contributes predominantly to the formation of char [40,41]; about 21% char yield was observed at 700 °C. The SEM images in Figure 2 revealed the effect of chemical activation and pyrolysis on the morphology We analyzed the pyrolysis behavior of orange peel precursor under a nitrogen atmosphere using thermogravimetric analysis.…”

Section: Resultsmentioning

confidence: 99%

Orange-Peel-Derived Carbon: Designing Sustainable and High-Performance Supercapacitor Electrodes

Ranaweera

Kahol

Ghimire

et al. 2017

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Abstract:Interconnected hollow-structured carbon was successfully prepared from a readily available bio-waste precursor (orange peel) by pyrolysis and chemical activation (using KOH), and demonstrated its potential as a high-performing electrode material for energy storage. The surface area and pore size of carbon were controlled by varying the precursor carbon to KOH mass ratio. The specific surface area significantly increased with the increasing amount of KOH, reaching a specific surface area of 2521 m 2 /g for a 1:3 mass ratio of precursor carbon/KOH. However, a 1:1 mass ratio of precursor carbon/KOH displayed the optimum charge storage capacitance of 407 F/g, owing to the ideal combination of micro-and mesopores and a higher degree of graphitization. The capacitive performance varied with the electrolyte employed. The orange-peel-derived electrode in KOH electrolyte displayed the maximum capacitance and optimum rate capability. The orange-peel-derived electrode maintained above 100% capacitance retention during 5000 cyclic tests and identical charge storage over different bending status. The fabricated supercapacitor device delivered high energy density (100.4 µWh/cm 2 ) and power density (6.87 mW/cm 2 ), along with improved performance at elevated temperatures. Our study demonstrates that bio-waste can be easily converted into a high-performance and efficient energy storage device by employing a carefully architected electrode-electrolyte system.

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“…Recently, varieties of natural biomass have been utilized as starting materials to prepare porous carbon materials for supercapacitor [18][19][20]. It was reported that willow catkins activated by KOH present large threedimensional interconnected micrometer-level pores composed of sheet-like primary particles [20].…”

Section: Introductionmentioning

confidence: 99%

Porous Activated Carbons Derived from Pleurotus eryngii for Supercapacitor Applications

Yuan

Sun

et al. 2018

Journal of Nanomaterials

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Varieties of natural biomass have been utilized to prepare porous carbon materials for supercapacitor applications. In this work, porous activated carbons derived from Pleurotus eryngii were prepared by carbonization and KOH activation. The activated carbons presented a large specific surface area of 3255 m 2 ·g −1 with high porosity. The as-prepared electrode exhibited a maximal specific capacitance of 236 F·g −1 measured in a three-electrode cell system. Furthermore, the assembled symmetric supercapacitor showed a specific capacitance of 195 F·g −1 at 0.2 A·g −1 and a superior specific capacitance retention of about 93% after 15000 cycles. The desirable capacitive behavior suggests that Pleurotus eryngii is an attractive biomass source of carbon materials for the potential supercapacitor applications.

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Coconut-Shell-Based Porous Carbons with a Tunable Micro/Mesopore Ratio for High-Performance Supercapacitors

Cited by 253 publications

References 56 publications

Eco‐Friendly and High Performance Supercapacitors for Elevated Temperature Applications Using Recycled Tea Leaves

Eco‐Friendly and High Performance Supercapacitors for Elevated Temperature Applications Using Recycled Tea Leaves

Orange-Peel-Derived Carbon: Designing Sustainable and High-Performance Supercapacitor Electrodes

Porous Activated Carbons Derived from Pleurotus eryngii for Supercapacitor Applications

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