KOH and NaOH activation mechanisms of multiwalled carbon nanotubes with different structural organisation

Raymundo-Piñero, E.; Azaïs, Philippe; Cacciaguerra, Thomas; Cazorla‐Amorós, Diego; Linares-Solano, Á.; Béguin, François

doi:10.1016/j.carbon.2004.11.005

Cited by 739 publications

(366 citation statements)

References 23 publications

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“…Further decomposition of potassium carbonates is also expected at temperatures higher than 700°C, with respect to the following equations [21],…”

Section: Hydrogen Storage Experimentsmentioning

confidence: 99%

“…In recent years, the hydrogen storage on metal organic framework's (MOFs) [3,[13][14][15], zeolite's [16,17] and carbon nanotubes [18][19][20][21][22][23][24][25], graphene [26][27][28] and activated carbons (ACs) have been reported in the literature by several groups. Among these ACs have proved to be one of the most promising adsorbent material for storage of hydrogen due to their availability, low cost and with tunable surface area.…”

Section: Introductionmentioning

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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“…Further decomposition of potassium carbonates is also expected at temperatures higher than 700°C, with respect to the following equations [21],…”

Section: Hydrogen Storage Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Ramesh

Rajalakshmi

Dhathathreyan

2017

Renew. Energy Environ. Sustain.

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“…Due to a high level of graphitization, the structure of the CNT cores was kept after KOH activation (Fig. 2d) [38]. Combined with the cross-linked structure of AC@CNT, a good conductivity of 725 S m −1 was obtained, which was an order of magnitude higher than that of the commercial AC (see Table S2).…”

Section: Resultsmentioning

confidence: 99%

Nano-structured red phosphorus/porous carbon as a superior anode for lithium and sodium-ion batteries

Ding

Zhu

et al. 2017

Sci. China Mater.

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To enhance electrochemical performance of lithium or sodium-ion batteries (LIBs or NIBs), active materials are usually filled in porous conductive particles to produce anode composites. However, it is still challenging to achieve high performance anode composites with high specific capacity, excellent rate performance, high initial Coulombic efficiency (ICE) and long cycle life. Based on these requirements, we design and fabricate activated carbon-coated carbon nanotubes (AC@CNT) with hierarchical structures containing micro-and meso-pores. A new structure of phosphorus/carbon composite (P@AC@CNT) is prepared by confining red P in porous carbon through a vaporization-condensation-conversion method. The micro-pores are filled with P, while the meso-pores remain unoccupied, and the pore openings on the particle surface are sealed by P. Due to the unique structure of P@AC@CNT, it displays a high specific capacity of 1674 mA h g −1 at 0.2 C, ultrahigh ICE of 92.2%, excellent rate performance of 1116 mA h g −1 at 6 C, and significantly enhanced cycle stability for LIBs. The application of P@AC@CNT in NIBs is further explored. This method for the fabrication of the special composites with improved electrochemical performance can be extended to other energy storage applications.

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“…Activation causes modification in the surface morphology and surface functional groups and causes removal of amorphous carbon. Activation of CNTs under oxidizing conditions with chemicals such as HNO 3 , KMnO 4 , H 2 O 2 , NaOCl, H 2 SO 4 , KOH, and NaOH have been widely reported [8,21,26,27]. During activation, the metallic impurities and catalyst support materials are dissolved and the surface characteristics are altered due to the introduction of new functional groups [24,26].…”

Section: Introductionmentioning

confidence: 99%

Potential of carbon nanomaterials for removal of heavy metals from water

Ruparelia

Duttagupta

Chatterjee³

et al. 2008

Desalination

166

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KOH and NaOH activation mechanisms of multiwalled carbon nanotubes with different structural organisation

Cited by 739 publications

References 23 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

Nano-structured red phosphorus/porous carbon as a superior anode for lithium and sodium-ion batteries

Potential of carbon nanomaterials for removal of heavy metals from water

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