Preparation of activated carbon having the structure derived from biomass by alkali activation with NaOH, and its application for electric double-layer capacitor

Konno, K.; Ohba, Yuya; Onoe, Kaoru; Yamaguchi, Tatsuaki

doi:10.7209/tanso.2008.2

Cited by 23 publications

(17 citation statements)

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“…Comparing with our previous studies on the NaOH-activated carbon from sugar cane bagasse with the conventional heating being conducted in two steps, carbonization and activation [5] [15], the present process using plasma heating showed a comparable surface area within a very short operation time of carbonization and activation. This might be the effect of ionization and active spices in plasma on activation mechanism of NaOH [20].…”

Section: Evaluation Of the Production Efficiencymentioning

confidence: 48%

“…This means the energy consumption by the plasma heating should be far less from our previous process by the conventional electric heating (carbonization by 1 h and activation by 1 h) [5] and the microwave-assisted heating [15] [17] [18] [19]. Comparing with our previous studies on the NaOH-activated carbon from sugar cane bagasse with the conventional heating being conducted in two steps, carbonization and activation [5] [15], the present process using plasma heating showed a comparable surface area within a very short operation time of carbonization and activation.…”

Section: Evaluation Of the Production Efficiencymentioning

confidence: 95%

“…As shown the increase of mesopore distribution with respect also rich in the mesopore distribution. In our previous study [5], the activated carbon with a higher specific surface area (S BET 2871 m 2 /g) obtained from carbonized sugar cane bagasse pith using an electric furnace (carbonization 1 h and activation 1 h with R NaOH 6.0, at 1073 K) afforded the value of C dl as much as 109 F/g. The value almost half to the present data in this project might come from the lower volume of mesopore (V meso 0.27 ml/g).…”

Section: Electric Double-layer Capacitancementioning

confidence: 97%

“…On the other hand, the preparation of activated carbon from such biomasses as bagasse, rice straw and bamboo, has been performed by alkali activation with NaOH by conventional thermal heating [5]. The process has been conducted by two steps, carbonization and activation.…”

Section: Introductionmentioning

confidence: 99%

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Short-Time Preparation of NaOH-Activated Carbon from Sugar Cane Bagasse Using Microwave Plasma Heating

Konno¹,

Oike²,

Ohba³

et al. 2017

GSC

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The microwave induced argon plasma was applied to the preparation of NaOH-activated carbon from sugar cane bagasse. The distinguished feature of the heating technique with this cold plasma is the short operation time. The carbonization and the activation process were finalized in one step within 3 min. The prepared activated carbon with NaOH ratio 3 to bagasse characterized using N 2 adsorption of type IV (IUPAC classification) to give specific surface area of 1980 m 2 /g and mesopore volume of 0.73 ml/g. It also showed a higher specific capacitance of 201 F/g in 1 M H 2 SO 4 solution (with standard three electrodes) than the corresponding one by the conventional heating, previously reported. The other features were the absence of oxygen groups and the presence of carbon centered stable radicals, detected by ESR spectra, on the surface.

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Section: Evaluation Of the Production Efficiencymentioning

confidence: 48%

Section: Evaluation Of the Production Efficiencymentioning

confidence: 95%

Section: Electric Double-layer Capacitancementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Short-Time Preparation of NaOH-Activated Carbon from Sugar Cane Bagasse Using Microwave Plasma Heating

Konno¹,

Oike²,

Ohba³

et al. 2017

GSC

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“…The R ext of SCGs-derived carbon activated with KOH is high, so it can be concluded that the pore structure allows electrolyte ions to enter and leave easily. 8,14,15 Figure 2 shows the result of the micropore size distribution analysis by the HK method. Pore diameters of their peaks were 0.51 nm for K2 and K5, and 0.54 nm for MSP-20.…”

Section: Electrochemical Measurementmentioning

confidence: 99%

Double Layer Properties of Spent Coffee Grounds-derived Carbon Activated with Potassium Hydroxide (KOH)

et al. 2013

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Large amounts of spent coffee grounds (SCGs) are generated all over the world. Since SCGs contain a lot of carbon and inherently has a porous structure, SCGs are considered to be a valuable industrial resource by carbonization. According to our previous research, it was apparent that the specific surface area of SCGs-derived carbon was greatly improved by potassium hydroxide (KOH) activation. In this research, we prepared an electric double layer capacitor (EDLC) using SCGs-derived carbon activated with KOH, and compared them to phenol resin-derived activated carbon (MSP-20, Kansai Coke and Chemicals Co., Ltd.), which is commonly used as a reference material in EDLC research. Electrodes were prepared by mixing 80 wt% activated carbon, 10 wt% carbon black and 10 wt% polytetrafluoroethylene (PTFE) and the electrolyte used was 1 M triethylmethylammonium-tetrafluoroborate (TEMA-BF 4 )/propylene carbonate (PC). The capacitive performance was evaluated by a constant current chargedischarge cycle measured with various electrical current loads from 5 to 150 mA/cm 2 . Although the capacitance of SCGs-derived carbon activated with KOH was inferior to that of MSP-20 at low current load density, it had high capacitance in high rate charge-discharge cycles. This suggests that the EDLC consisting of SCGs-derived activated carbon electrodes is superior to MSP-20 in capacitance retention rate when used at a high electric current density.

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Promising Carbons for Supercapacitors Derived from Fungi

et al. 2011

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Preparation of activated carbon having the structure derived from biomass by alkali activation with NaOH, and its application for electric double-layer capacitor

Cited by 23 publications

References 0 publications

Short-Time Preparation of NaOH-Activated Carbon from Sugar Cane Bagasse Using Microwave Plasma Heating

Short-Time Preparation of NaOH-Activated Carbon from Sugar Cane Bagasse Using Microwave Plasma Heating

Double Layer Properties of Spent Coffee Grounds-derived Carbon Activated with Potassium Hydroxide (KOH)

Promising Carbons for Supercapacitors Derived from Fungi

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