Excess Adsorption Isotherms of Hydrogen on Activated Carbons from Agricultural Waste Materials

Soukup, Karel; Hejtmánek, Vladimı́r; Cruz, Gerardo J. F.; Jandová, Věra; Šolcová, Olga

doi:10.1002/ceat.201600610

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…The average pore diameter ( d ) was found from the desorption isotherms by utilizing the Barrett–Joyner–Halenda (BJH) method. In addition, nonlocal density functional theory (NLDFT) pore size distributions (PSDs; d V /d d ) were obtained from adsorption branches of isotherms using the NLDFT model implemented SAIEUS software (v.2.1 demo, Micromeritics), as previously reported in the literature. − The standard slit model for nitrogen physisorption on carbon was used, and the L-curve method was applied to balance the resulting solution roughness and goodness of the fit.…”

Section: Methodsmentioning

confidence: 99%

Preparation of Highly Porous Carbon through Slow Oxidative Torrefaction, Pyrolysis, and Chemical Activation of Lignocellulosic Biomass for High-Performance Supercapacitors

et al. 2019

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Seven kinds of highly porous activated carbon were prepared from two different lignocellulosic biomass feedstocks (hybrid willow and miscanthus grass) by utilizing four different processing routes, which generally include variations of the pyrolysis, slow oxidative torrefaction, and KOH chemical activation. The activated carbons were evaluated for potential application within the electrodes of double layer supercapacitors. The synthesized activated carbons showed high specific surface area (up to 3265 m2/g), hierarchical pore structure composed of micro-/meso-/macropores with large pore volume (up to 1.535 cm3/g), and rich oxygen content (10.9–19.2 at. %). Their surface area, pore structure/volume, microstructure, and surface functional groups were highly influenced by processing routes, which in turn determined their electrochemical performance and stability. In particular, pretreating the biomass samples via slow oxidative torrefaction substantially increased their surface area, total pore volume, and meso-/micropore volume, and the surface chemistry of these materials showed a higher concentration of carboxyl groups. The performance of two-electrode symmetrical supercapacitors was evaluated in a 6 M KOH aqueous electrolyte. They exhibited relatively high specific capacitance of 70.2–162.3 F/g under constant current density of 100 mA/g, with a high cycling stability based on the capacitance retention of 95.1–99.9% after 1000 cycles. In addition, an increase of 25.0–62.2 F/g was achieved in specific capacitance by including the pyrolysis and/or slow oxidative torrefaction in the synthesis protocol. The sample (HW-D) that exhibited the best performance also maintained 94.1% of its specific capacitance after 5000 charge/discharge cycles at 100 mA/g. The synthesis strategies including the slow oxidative torrefaction pretreatment showed great promise for preparing low-cost, porous carbon materials from renewable biomass sources that are highly suitable for incorporation in supercapacitors and other electrochemical applications.

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Section: Methodsmentioning

confidence: 99%

Preparation of Highly Porous Carbon through Slow Oxidative Torrefaction, Pyrolysis, and Chemical Activation of Lignocellulosic Biomass for High-Performance Supercapacitors

et al. 2019

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“…In the meantime, carbon nanotubes were addressed. According to the fact that carbon nanotubes have high chemical stability, high surface, and are also void, the nanometric microstructures can be a certain intermediator to store other materials 24–28.…”

Section: Introductionmentioning

confidence: 99%

Effect of Single‐ and Multiwall Carbon Nanotubes with Activated Carbon on Hydrogen Storage

Jokar

Nguyen

Pourkhalil³

et al. 2021

Chem Eng & Technol

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Carbon nanotubes and nanoporous activated carbons served as adsorbents for hydrogen storage. Carbon nanotubes were prepared by a special chemical vapor deposition method over a Co‐Mo/MgO catalyst, and nanoporous activated carbons were obtained from walnut shells. According to the Fourier transform infrared analysis, oxygenated functional groups were formed on the structures. The X‐ray diffraction and scanning electron microscopy results let conclude that the structures were not damaged by the acidic vapor method. The maximum experimental value for adsorption capacity was achieved under elevated pressure. The highest capacity of H2 adsorption was detected for nitric acid‐modified carbon.

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Functionalized and Schiff base based multi walled carbon nanotubes for hydrogen storage

Çakir,

Doğan,

Kizilduman

et al. 2025

Journal of Alloys and Compounds

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Excess Adsorption Isotherms of Hydrogen on Activated Carbons from Agricultural Waste Materials

Cited by 5 publications

References 19 publications

Preparation of Highly Porous Carbon through Slow Oxidative Torrefaction, Pyrolysis, and Chemical Activation of Lignocellulosic Biomass for High-Performance Supercapacitors

Preparation of Highly Porous Carbon through Slow Oxidative Torrefaction, Pyrolysis, and Chemical Activation of Lignocellulosic Biomass for High-Performance Supercapacitors

Effect of Single‐ and Multiwall Carbon Nanotubes with Activated Carbon on Hydrogen Storage

Functionalized and Schiff base based multi walled carbon nanotubes for hydrogen storage

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