Wettability of colloid-imprinted carbons by contact angle kinetics and water vapor sorption measurements

Li, Xiaoan; Banham, Dustin; Feng, Feng; Forouzandeh, Farisa; Ye, Siyu; Kwok, Daniel Y.; Birss, Viola I.

doi:10.1016/j.carbon.2015.01.041

Cited by 29 publications

(100 citation statements)

References 93 publications

(158 reference statements)

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“…20−26 However, our recent studies have shown that the CICs have a much more hydrophilic surface than do readily available, commercial, carbon blacks, e.g., Vulcan carbon (VC), which is widely used as a catalyst support in PEMFCs. 27 It is thus anticipated to be challenging to use the CICs in their assynthesized state for this purpose because the hydrophilic CIC surface could potentially cause flooding problems in the pores of the cathode where water is produced. 28−30 When used as the stationary phase in chromatography, the CICs must possess a wide range of surface polarity (from hydrophilic to hydrophobic) to selectively adsorb a range of analytes.…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics of Microporous and Mesoporous Carbons Functionalized with Pentafluorophenyl Groups

Forouzandeh

Kakanat

et al. 2018

ACS Appl. Mater. Interfaces

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The in situ diazonium reduction reaction is a reliable and well-known approach for the surface modification of carbon materials for use in a range of applications, including in energy conversion, as chromatography supports, in sensors, etc. Here, this approach was used for the first time with mesoporous colloid-imprinted carbons (CICs), materials that contain ordered monodisperse pores (10-100 nm in diameter) and are inherently highly hydrophilic, using a common microporous carbon (Vulcan carbon (VC)), which is relatively more hydrophobic, for a comparison. The ultimate goal of this work was to modify the CIC wettability without altering its nanostructure and also to lower its susceptibility to oxidation, as required in fuel cell and battery electrodes, by the attachment of pentafluorophenyl (-PhF) groups onto their surfaces. This was shown to be successful for the CIC, with the -PhF groups uniformly coating the inner pore walls at a surface coverage of ca. 90% and allowing full solution access to the mesopores, while the -PhF groups deposited only on the outer VC surface, likely blocking its micropores. Contact angle kinetics measurements showed enhanced hydrophobicity, as anticipated, for both the -PhF modified CIC and VC materials, even revealing superhydrophobicity at times for the CIC materials. In contrast, water vapor sorption and cyclic voltammetry suggested that the micropores remained hydrophilic, arising from the deposition of smaller N- and O-containing surface groups, caused by a side reaction during the in situ diazonium functionalization process.

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Section: Introductionmentioning

confidence: 99%

Surface Characteristics of Microporous and Mesoporous Carbons Functionalized with Pentafluorophenyl Groups

Forouzandeh

Kakanat

et al. 2018

ACS Appl. Mater. Interfaces

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“…Water vapor sorption studies were done by placing ∼100 mg of AB samples in glass vials together with 100 mL of MiliQ water in a vacuum grease sealed glass chamber similar to the method used by Li et al. . Mass of the samples were measured periodically.…”

Section: Methodsmentioning

confidence: 99%

Impact of Carbon Porosity on the Performance of Cathode Microporous Layers in Proton Exchange Membrane Fuel Cells

et al. 2020

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Acetylene black carbons were activated under flowing CO 2 atmosphere at 900°C for different treatment times. The impact of this heat treatment on the porosity, hydrophilicity, and surface oxygen groups was carefully examined. Longer periods of activation led to increases in the surface area and porosity of the samples. Pore size distributions of the samples showed an increase in micropores, followed by a rise in mesopores, which indicated the occurrence of pore widening with a longer activation period. When used as a microporous layer for H 2 /air fuel cells, samples with higher levels of porosity showed, in general, reduced mass transport performance due to the formation of pooling locations for water. These results highlight the importance of textural pores in carbon structures on the water management in hydrogen fuel cell when operating under high humidity conditions.

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“…One of the conventional approaches used to synthesize carbon materials with a nanoengineered porous structure is templating. 5–10 For example, colloid-imprinted carbon (CIC) powders contain fully tunable and ordered monodispersed pores (10–100 nm in diameter), and have been considered for use as catalyst supports in proton-exchange membrane fuel cells, 7 solid contacts in ion-selective electrodes, 8 and so forth. 9,10 However, the CICs are powders, which raises health concerns and application limitations due to the need for binders and due to the presence of uncontrolled inter-particle porosity.…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry of new generation conformal polyaniline/carbon scaffolds with monodispersed nanopores and high capacitance

Чернышова

Gawron

et al. 2022

J. Mater. Chem. C

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Wettability of colloid-imprinted carbons by contact angle kinetics and water vapor sorption measurements

Cited by 29 publications

References 93 publications

Surface Characteristics of Microporous and Mesoporous Carbons Functionalized with Pentafluorophenyl Groups

Surface Characteristics of Microporous and Mesoporous Carbons Functionalized with Pentafluorophenyl Groups

Impact of Carbon Porosity on the Performance of Cathode Microporous Layers in Proton Exchange Membrane Fuel Cells

Electrochemistry of new generation conformal polyaniline/carbon scaffolds with monodispersed nanopores and high capacitance

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