Bud type carbon nanohorns: materials for high pressure CO<sub>2</sub> capture and Li-ion storage

Babu, Deepu J.; Herdt, Tim; Okeil, Sherif; Bruns, Michael; Staudt, Reiner; Schneider, Jörg J.

doi:10.1039/c6ta03933b

Cited by 19 publications

(12 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calibration values were validated by measuring CO 2 (99.998%) adsorption on a Norit R1 extra™ device at 25 °C following the procedure of Möllmer et al [ 39 ]. The values were found to be in good agreement with those reported in literature for a pressure range of 0–40 bar [ 40 ]. In a typical measurement, about 80 mg of the sample was weighed accurately after degassing at 150 °C and loaded in to the adsorption chamber.…”

Section: Methodssupporting

confidence: 89%

Hierarchically structured nanoporous carbon tubes for high pressure carbon dioxide adsorption

Patzsch

Babu

Schneider

2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

Mesoscopic, nanoporous carbon tubes were synthesized by a combination of the Stoeber process and the use of electrospun macrosized polystyrene fibres as structure directing templates. The obtained carbon tubes have a macroporous nature characterized by a thick wall structure and a high specific surface area of approximately 500 m²/g resulting from their micro- and mesopores. The micropore regime of the carbon tubes is composed of turbostratic graphitic areas observed in the microstructure. The employed templating process was also used for the synthesis of silicon carbide tubes. The characterization of all porous materials was performed by nitrogen adsorption at 77 K, Raman spectroscopy, infrared spectroscopy, thermal gravimetric analysis (TGA), scanning electron microscopy (SEM) as well as transmission electron microscopy (TEM). The adsorption of carbon dioxide on the carbon tubes at 25 °C at pressures of up to 30 bar was studied using a volumetric method. At 26 bar, an adsorption capacity of 4.9 mmol/g was observed. This is comparable to the adsorption capacity of molecular sieves and vertically aligned carbon nanotubes. The high pressure adsorption process of CO2 was found to irreversibly change the microporous structure of the carbon tubes.

show abstract

Section: Methodssupporting

confidence: 89%

Hierarchically structured nanoporous carbon tubes for high pressure carbon dioxide adsorption

Patzsch

Babu

Schneider

2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…At the highest studied pressure of about 36 bar, N-doped VACNTs is found to have an adsorption capacity of 8 mmol g –1 at 25 °C. This value is greater than the reported adsorption capacity of other adsorbents like zeolites, ordered mesoporous carbon nitride, N-doped ordered mesoporous carbon, MCM-41, or carbon nanohorns but is lower than that of MOFs …”

Section: Resultsmentioning

confidence: 55%

“…About 75 mg of sample was used for the measurement, and the isotherms were measured at 20, 25, and 30 °C. A water bath was used for maintaining the isothermal conditions; more details of the volumetric setup and the measurement can be found elsewhere …”

Section: Methodsmentioning

confidence: 99%

Understanding the Influence of N-Doping on the CO₂ Adsorption Characteristics in Carbon Nanomaterials

et al. 2017

Self Cite

View full text Add to dashboard Cite

Compared to metal–organic frameworks and zeolites, carbon-based materials are particularly interesting for gas capture applications due to their better stability against moisture and corrosive flue gases. Increasing the accessible surface area and incorporation of heteroatoms are generally the two different strategies put forward to further enhance the adsorption characteristics of carbon materials. The influence of nitrogen incorporation on the gas adsorption characteristics, especially CO2 adsorption, is however a controversial research topic with conflicting conclusions reported by various studies. In the present work, using vertically aligned carbon nanotubes (VACNTs), we investigate for the first time the influence of N-doping on the CO2 adsorption characteristics of carbon materials. The present study aims to shed additional light on the parameters known so far as well as those that are currently not considered but are additionally responsible for gas adsorption in functionalized carbon materials. To this end vertically aligned carbon nanotubes (VACNTs) are ideal carbon model structures for gas adsorption studies as they have a well-defined, reproducible mesoporous pore structure with a chemically homogeneous surface. Thus, the interfering influence of micropores, which are generally present in carbon-based adsorbents, is avoided, making a straightforward interpretation of the exact influence of N-doping possible for the first time. N-incorporation in the form of pyridinic or pyrrolic/pyridonic groups is achieved by using a N2 rf plasma treatment. The presence of these nitrogen functionalities is found to have a beneficial influence on the CO2 adsorption characteristics over a wide range of pressure (0–36 bar). The nature of interaction is determined by calculating the isosteric heat of adsorption and finally by comparing the adsorption characteristics of as-prepared and N-doped VACNTs with oxygen functionalized VACNTs; the importance of determining the oxygen functional groups in the adsorbent is presented.

show abstract

“…The Raman spectrum of SWNTs also indicates the presence of a characteristic RBM mode (Figure S1 in Supporting Information File 1 ). The Raman spectrum for CNHs is characterized by similar intensities of the D- and G-bands where the D-band intensity is mainly due to the presence of the pentagon rings in the cone region of individual CNHs [ 24 , 37 ]. In GO, similar to CNHs, the D-band and G-band are equally intense and is an indicator of the structural distortion induced by the attachment of a large number of functional groups [ 12 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

“…The as-synthesized CNHs are closed and the interior of the CNHs is inaccessible for the gas molecules. An oxidative treatment such as heating in air, O 2 [ 21 – 22 ] or CO 2 [ 23 – 24 ] is used to open CNHs, thereby increasing the accessible surface area 3–4-fold. CNHs have a combination of micro–mesopores and are interesting for gas adsorption applications as they can be produced in large quantities with high purity [ 25 – 26 ].…”

Section: Introductionmentioning

confidence: 99%

SO₂ gas adsorption on carbon nanomaterials: a comparative study

Babu¹,

Divya²,

Kühl³

et al. 2018

Beilstein J. Nanotechnol.

Self Cite

View full text Add to dashboard Cite

Owing to their high stability against corrosive gases, carbon-based adsorbents are preferentially used for the adsorptive removal of SO2. In the present study, SO2 adsorption on different carbon nanomaterials namely carbon nanohorns (CNHs), multiwalled carbon nanotubes (MWNTs), single-walled carbon nanotubes (SWNTs) and vertically aligned carbon nanotubes (VACNTs) are investigated and compared against the adsorption characteristics of activated carbon and graphene oxide (GO). A comprehensive overview of the adsorption behavior of this family of carbon adsorbents is given for the first time. The relative influence of surface area and functional groups on the SO2 adsorption characteristics is discussed. The isosteric heat of adsorption values are calculated to quantify the nature of the interaction between the SO2 molecule and the adsorbent. Most importantly, while chemisorption is found to dominate the adsorption behavior in activated carbon, SO2 adsorption on carbon nanomaterials occurs by a physisorption mechanism.

show abstract

Bud type carbon nanohorns: materials for high pressure CO₂ capture and Li-ion storage

Abstract: High pressure CO2 gas adsorption of tip opened CNHs is reported herein for the first time and is found to be superior to traditional CO2 adsorbents like zeolites. In addition a rare case of a binderfree CNH electrode and its performance in Li-ion storage is demonstrated.

Cited by 19 publications

References 61 publications

Hierarchically structured nanoporous carbon tubes for high pressure carbon dioxide adsorption

Hierarchically structured nanoporous carbon tubes for high pressure carbon dioxide adsorption

Understanding the Influence of N-Doping on the CO₂ Adsorption Characteristics in Carbon Nanomaterials

SO₂ gas adsorption on carbon nanomaterials: a comparative study

Contact Info

Product

Resources

About

Bud type carbon nanohorns: materials for high pressure CO2 capture and Li-ion storage

Abstract: High pressure CO2 gas adsorption of tip opened CNHs is reported herein for the first time and is found to be superior to traditional CO2 adsorbents like zeolites. In addition a rare case of a binderfree CNH electrode and its performance in Li-ion storage is demonstrated.

Cited by 19 publications

References 61 publications

Hierarchically structured nanoporous carbon tubes for high pressure carbon dioxide adsorption

Hierarchically structured nanoporous carbon tubes for high pressure carbon dioxide adsorption

Understanding the Influence of N-Doping on the CO2 Adsorption Characteristics in Carbon Nanomaterials

SO2 gas adsorption on carbon nanomaterials: a comparative study

Contact Info

Product

Resources

About

Bud type carbon nanohorns: materials for high pressure CO₂ capture and Li-ion storage

Understanding the Influence of N-Doping on the CO₂ Adsorption Characteristics in Carbon Nanomaterials

SO₂ gas adsorption on carbon nanomaterials: a comparative study