Electrical double-layer capacitance of micro- and mesoporous activated carbon prepared from rice husk and beet sugar

Kumagai, Seiji; Sato, Masashi; Tashima, Daisuke

doi:10.1016/j.electacta.2013.10.060

Cited by 109 publications

(49 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, the type of activating agent and characteristics of the pores in carbon and electrolytes used affect the capacitive performance. [5,14] Hence, apart from activation at different KOH ratios, it is also essential to understand the electrochemical behavior of activated carbon in different aqueous electrolytes. In this study, we report on structural and electrochemical properties of carbon prepared by calcination and activation of waste tea leaves.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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

et al. 2017

View full text Add to dashboard Cite

show abstract

“…It is known that the surface area, pore size, and purity texture have significant influence on the performances of supercapacitor for the electrode material [7]. So far, AC has been widely applied in electrode material for supercapacitor applications, owing to its advantages of good chemical stability and conductivity, large surface area, low cost [8][9][10][11], etc. However, the AC products show a high K + content due to the process limitations of KOH activation, as a result, the already-formed AC pores were blocked, which had a negative effect on the specific capacitance and cycle life of supercapacitor.…”

Section: Introductionmentioning

confidence: 99%

Oxidation-Ultrasound Process on Removing Potassium Ions from Activated Carbon for Improving Electrochemical Properties of Supercapacitor

Sun¹

2016

Supercapacitor Design and Applications

View full text Add to dashboard Cite

To produce pure activated carbon (AC) with low potassium ions (K + ) content for supercapacitor, coconut-shell AC activated by KOH was treated with a novel oxidation-ultrasound process on the basis of hydrochloric acid (HCl) washing. The electrochemical performances of the ACs as supercapacitor electrodes were characterized by cyclic voltammetry (CV), galvanostatic charge-discharge (GC), and electrochemical impedance spectroscopy (EIS). Results showed that the obtained AC, which was washed with 1.0 wt% HCl solution for 120 min and subsequently treated with 0.6 wt% H 2 O 2 solution at 60°C in an ultrasonic oscillator for 8 h, possessed a K + content of 46 mg/kg, much lower than that of 417 mg/kg of the AC without oxidationultrasound treatment. Furthermore, a large specific surface area and pore volume of 3460 m 2 /g and 1.869 cm 3 /g, respectively, were obtained for AC after oxidation-ultrasound treatment. A high specific capacitance of 306 F/g at the current density of 1 A/g in 1 M H 2 SO 4 electrolyte was observed for the prepared AC, indicating it has good electrochemical performances, and remained at 294 F/g with a capacitance retention of 96% after 3000 cycles, indicating excellent stability and capacitive behavior of the AC electrode for supercapacitor.

show abstract

“…The SMFW consists of sawdust and rice husk majorly. Previous study using sawdust as AC by Foo & Hameed [5] and Moodley et al [6] and rice husk as AC by Khan et al [7], Chen et al [8], Kumagai et al [9] and Ding et al [10] have generated highly porous carbonaceous carbon. These reports showed that both components of sawdust and rice husk are suitable as a potential precursor.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Activated Carbon Preparation From Spent Mushroom Farming Waste (Smfw) via Box–behnken Design of Response Surface Methodology

Md-Desa¹,

Ghani²,

Talib³

et al. 2016

MJAS

View full text Add to dashboard Cite

This study focuses on activated carbon preparation from spent mushroom farming waste (SMFW) via chemical activation using Box-Behnken design (BBD) of Response Surface Methodology (RSM). Potassium hydroxide (KOH) functions as activating reagent and it plays an important role in enhancing the activated carbon porosity. Three input parameters and two responses were evaluated via this software generated experimental design. The effects of three preparation parameters of impregnation ratio, activation time and activation temperature as well as two responses of carbon yield and iodine number were investigated. The optimum conditions for preparing activated carbon from SMFW was found at SMFW: KOH impregnation ratio of 0.25, activation time of 30 min and activation temperature of 400 o C which resulted in 28.23 % of carbon yield and 314.14 mg/g of iodine number with desirability of 0.994. The predicted results were well corresponded with experimental results. This study is important in economical large scale SMFW activated carbon preparation for application study of adsorption process for metal treatment in wastewater with minimum chemical and energy input.Keywords: activated carbon, spent mushroom farming waste, Box-Behnken design, response surface methodology Abstrak Kajian ini memfokuskan penyediaan arang teraktif daripada sisa tanaman cendawan terpakai melalui reka bentuk box-behnken (BBD) dari kaedah gerak balas permukaan (RSM). Potasium hidroksida (KOH) berperanan sebagai agen pengaktifan dan penting untuk meningkatkan liang arang teraktif. Tiga parameter input dan dua respon telah dinilai oleh perisian ini yang dihasilkan oleh rekabentuk eksperimen. Kesan daripada penyediaan tiga parameter iaitu nisbah pemadatan, masa pengaktifan dan suhu pengaktifan serta dua respon iaitu hasil arang teraktif dan nilai iodin telah disiasat. Keadaan optimum dalam penyediaan arang teraktif telah didapati pada nisbah SMFW: KOH iaitu 0.25, tempoh pengaktifan selama 30 min dan suhu pengaktifan 400 °C, di mana ia menghasilkan jumlah maksimum arang teraktif sebanyak 28.23 % dan nilai iodin yang boleh diterima iaitu sebanyak 314.14 mg/g dengan ketepatan 0.994. Keputusan yang telah diramalkan adalah seiring dengan keputusan eksperimen. Kajian ini adalah penting dalam penyediaan arang teraktif secara berskala besar dengan ekonomi daripada sisa tanaman cendawan terpakai untuk kajian proses penjerapan terhadap rawatan logam dalam air sisa dengan input bahan kimia dan tenaga yang minimum. ISSN -2506 Nurul-Shuhada et al: OPTIMIZATION OF ACTIVATED CARBON PREPARATION FROM SPENT MUSHROOM FARMING WASTE (SMFW) VIA BOX-BEHNKEN DESIGN OF RESPONSE SURFACE METHODOLOGY 462Kata kunci: karbon teraktif, sisa tanaman cendawan terpakai, reka bentuk Box-Behnken, kaedah gerak balas permukaan Introduction Activated carbon (AC) is a carbonaceous material with large surface area and high porosity. The surface area and pore size distribution are important factors in determination of AC performance. The macropores act as the entrance to the AC, while the m...

show abstract

Electrical double-layer capacitance of micro- and mesoporous activated carbon prepared from rice husk and beet sugar

Cited by 109 publications

References 57 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

Oxidation-Ultrasound Process on Removing Potassium Ions from Activated Carbon for Improving Electrochemical Properties of Supercapacitor

Optimization of Activated Carbon Preparation From Spent Mushroom Farming Waste (Smfw) via Box–behnken Design of Response Surface Methodology

Contact Info

Product

Resources

About