Synthesis of KOH-activated porous carbon materials and study of hydrogen adsorption

Minoda, Ai; Oshima, Shinji; Iki, Hideshi; Akiba, Etsuo

doi:10.1016/j.jallcom.2013.02.085

Cited by 36 publications

(36 citation statements)

References 25 publications

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“…The graphitic nature of the carbon material is decrease with the increase in chemical agent ratio due to increase in porosity of the material. Figure 3 shows the adsorption isotherms of the AC materials from jute fibers which exhibit an isotherms of Type I isotherm with H4 hysteresis [35,38,[47][48][49]. This is characteristic of materials of microporous nature due to strong interaction potential between the carbon surface and N 2 .…”

Section: Hydrogen Storage Experimentsmentioning

confidence: 99%

“…It has been observed that alkali treatment using KOH and NaOH at elevated temperature around 700°C, leads to high specific surface area and total pore volume [21,38,39]. Yang et al [36] reported that the hydrogen uptake of 3.28 wt.% was obtained for AC synthesized using hemp stem, showing a Brunauer-Emmett-Teller (BET) surface area of 3241 m 2 /g and total pore volume of 1.98 cm 3 /g at À196°C and 1 bar.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of activated carbon from jute fibers for hydrogen storage

Ramesh

Rajalakshmi

Dhathathreyan

2017

Renew. Energy Environ. Sustain.

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Abstract. Activated carbons (ACs) are being used as energy storage material especially for hydrogen storage application. In the present work, AC materials were synthesized from jute fibers, activated and treated using KOH to increase the porosity of samples. These AC samples retained the fibrous structure even after chemical activation at high temperature of 700°C. Channel like structures were formed which helps to increase the hydrogen storage capacity. The surface area of these samples varied from 380 to 1220 m 2 /g due to carbonization and activation treatment. The sample with high surface area of 1224 m 2 /g showed a high hydrogen uptake capacity of 1.2 wt.% at 30°C and 40 bar of H 2 gas pressure. This sample also showed a high pore volume of 0.74 cm 3 /g. These results indicate that the raw material jute fibers can be used as hydrogen storage medium after thermal and chemical treatment which increases the surface area and micropore volume.

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Section: Hydrogen Storage Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of activated carbon from jute fibers for hydrogen storage

Ramesh

Rajalakshmi

Dhathathreyan

2017

Renew. Energy Environ. Sustain.

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“…In physical (thermal) activation, the gasification of char is performed at high temperature (usually above 1,073 K) with steam, carbon dioxide or a mixture of them [15][16][17][18]. In chemical activation, the precursor is impregnated with chemical agents like KOH [19,20], K 2 CO 3 [21,22], ZnCl 2 [23], H 3 PO 4 [24,25] and activated at comparatively lower temperatures than the physical activation, however involving a washing stage, wherein the respective salts are removed from the activated material.…”

Section: Introductionmentioning

confidence: 99%

Effect of Activating Agent on the Preparation of Bamboo-Based High Surface Area Activated Carbon by Microwave Heating

Xia¹,

Wu²,

Srinivasakannan³

et al. 2015

High Temperature Materials and Processes

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The present work attempts to convert bamboo into a high surface area activated carbon via microwave heating. Different chemical activating agents such as KOH, NaOH, K 2 CO 3 and Na 2 CO 3 were utilized to identify a most suitable activating agent. Among the activating agents tested KOH was found to generate carbon with the highest porosity and surface area. The effect of KOH/C ratio on the porous nature of the activated carbon has been assessed. An optimal KOH/C ratio of 4 was identified, beyond which the surface area as well as the pore volume were found to decrease. At the optimized KOH/C ratio the surface area and the pore volume were estimated to be 3,441 m 2 /g and 2.093 ml/g, respectively, with the significant proportion of which being microporous (62.3%). Activated carbon prepared under the optimum conditions was further characterized using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). Activated carbons with so high surface area and pore volume are very rarely reported, which could be owed to the nature of the precursor and the optimal conditions of mixture ratio adopted in the present work.

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“…In the two-stage activation process of carbonization, the oxygen and hydrogen are burned and the char is heated in steam or carbon dioxide atmosphere to create a highly porous structure. The hydrogen storage capacity also found to increase if the carbon materials possess high specific surface area and micropore volume [20][21][22][23]. Although various carbons show a weight capacity of 0.1-7.5 wt%, at 77 K and at 1 MPa, the highest hydrogen storage capacity at RT was not found to be more than 1 wt% at 298 K, 1 MPa, while the targets by DOE for hydrogen storage is 5.5% in 2015.…”

Section: Introductionmentioning

confidence: 96%

Activated carbons derived from tamarind seeds for hydrogen storage

Ramesh

Rajalakshmi

Dhathathreyan

2015

Journal of Energy Storage

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Synthesis of KOH-activated porous carbon materials and study of hydrogen adsorption

Cited by 36 publications

References 25 publications

Synthesis and characterization of activated carbon from jute fibers for hydrogen storage

Synthesis and characterization of activated carbon from jute fibers for hydrogen storage

Effect of Activating Agent on the Preparation of Bamboo-Based High Surface Area Activated Carbon by Microwave Heating

Activated carbons derived from tamarind seeds for hydrogen storage

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