Synergism of nitrogen and reduced graphene in the electrocatalytic behavior of resorcinol - Formaldehyde based carbon aerogels

Nagy, Balázs; Bakos, I.; Bertóti, I.; Domán, Andrea; Menyhárd, Alfréd; Mohai, M.; László, Krisztina

doi:10.1016/j.carbon.2018.07.061

Cited by 30 publications

(24 citation statements)

References 63 publications

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Section: Morphology Of the Carbon Aerogelssupporting

confidence: 70%

“…Owing to the greater accessible surface of this sample, the CV hysteresis is much wider. This response is also comparable to that of the conventional resorcinol-formaldehyde-based carbon aerogels synthesized in water and has a similar value of SBET (≈800 m 2 /g) [17,23]. The electrochemical characteristics of the exclusively microporous C9 sample having the smallest measurable surface area and the mesoporous C49 sample with the largest surface area were investigated (see Figure 6).…”

Section: Morphology Of the Carbon Aerogelssupporting

confidence: 60%

“…A glassy carbon (GC) rotating disc electrode (RDE, Pine Research Instrumentation, Durham, NC, USA) was used for the electrochemical measurements. Details on the electrode preparation are given elsewhere [17]. The working electrodes were prepared by dispersing 2 mg of powdered carbon in 2 mL mixture of isopropyl alcohol and Nafion®solution.…”

Section: Characterization Methodsmentioning

confidence: 99%

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Water-Ionic Liquid Binary Mixture Tailored Resorcinol-Formaldehyde Carbon Aerogels without Added Catalyst

et al. 2019

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The potential applications of mesoporous carbon aerogels are wide-ranging. These gels are often obtained from resorcinol-formaldehyde (RF) hydrogel precursors. The sol-gel method in this synthesis provides an efficient and versatile means of product control through systematic variation of process conditions, such as pH, stoichiometry, concentration, catalyst, further additives, etc., in addition to the drying and pyrolytic conditions. Here, a novel means of tuning the texture of carbon aerogels is proposed. Water-1-ethyl-3-methylimidazolium ethyl sulfate ([emim][EtSO4] mixtures constitutes a polycondensation medium that requires no added catalyst, thus yielding an intrinsically metal-free carbon aerogel after pyrolysis. We also show that the carbon morphology is tailored by the supramolecular structure of the aqueous ionic liquid. The results of scanning electron micrographs, low-temperature nitrogen adsorption/desorption isotherms, and small-angle X-ray scattering (SAXS) confirm that changing the initial water concentration from 9 to 55 wt % gives rise to systematic alteration of the mesopore size and volume, as well as of the bead size. The pore structure becomes consolidated only when the water content exceeds 25 wt %. When the water content reaches 55 wt %, the bead size increases by two orders of magnitude. The electrocatalytic performance, however, is compromised, most probably by structural defects.

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Section: Morphology Of the Carbon Aerogelssupporting

confidence: 70%

Section: Morphology Of the Carbon Aerogelssupporting

confidence: 60%

Section: Characterization Methodsmentioning

confidence: 99%

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Water-Ionic Liquid Binary Mixture Tailored Resorcinol-Formaldehyde Carbon Aerogels without Added Catalyst

et al. 2019

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“…Due to their electron donor character, they also enhance the uptake of acidic gases and the adsorption capacities toward heavy metal ions [22,23]. Nitrogen functionalities on porous carbon surfaces also have an important role in (electro)catalytic reactions [24].…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation of crab shell biomass, a nitrogen-containing carbon precursor

Sebestyén

Jakab

Domán

et al. 2020

J Therm Anal Calorim

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Waste and low-cost lignocellulosic biomasses are well studied and widely used as raw materials for porous carbon adsorbents. Much less attention is given to the exploration of the potential of marine biomasses, though these materials contain also nitrogen, which-if preserved during the processing-has a beneficial influence on the sorption properties of the porous carbon obtained. Here, we report a multi-technique investigation into the conversion of crab shell to porous carbon adsorbent. Thermogravimetry and pyrolysis-GC/MS studies were used to reveal the thermal degradation of this natural polymer and follow the decomposition process through the identification of the products. Almost 40 various volatile degradation products were distinguished released at 500 °C pyrolysis temperature. Based on the TGA/DTG results, two temperatures, 350 and 500 °C, were selected to obtain pyrolytic samples in macroscopic quantities in order to characterize the morphology and surface chemistry of the solid fraction. More than 50% of the nitrogen atoms were still in the carbonaceous matrix after the 500 °C pyrolysis in the C-N=C, C-NH and 3C-N-type bonds. The ash content < 1% included hydroxylapatite-type crystalline matter. Based on these results, we may conclude that crab shells have a high potential as precursor of nitrogen-containing biochar.

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“…They can also be pyrolyzed in an inert media to manufacture carbon gels. 9 Such organic and carbon gels expose exceptional features in various applications such as electronics, catalysis, etc. 10,11 Therefore, it is better to manufacture these gels via a low-cost and time-saving synthesis approach.…”

Section: Introductionmentioning

confidence: 99%

Using electric power to synthesize resorcinol‐formaldehyde gels with enhanced characteristics

Awadallah‐F

Al‐Muhtaseb

2020

Int J Energy Res

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A novel electrochemical approach was introduced for crosslinking resorcinolformaldehyde (RF) gels at room temperature without utilizing a catalyst or a buffer. The electrochemically cross-linked gels and their subsequent activated carbons exhibited enhanced physical properties. They were characterized via different methods such as scanning electron microscope (SEM), Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), and surface area and porosity analyzer. The gels prepared with this novel approach range from dark red to deep yellow in color; and consist of different particle sizes depending on the used voltage. FTIR spectra showed that the gels prepared with the novel and conventional methods have identical chemical identities. However, the RF gels prepared with the novel approach of synthesis expose more controllable properties such as pore structure, surface area, particle size, etc, than those prepared with the conventional method, which makes them easier to design for different applications. The corresponding activated carbons showed higher surface areas and narrower micropore distributions that can be varied easily with voltage, which is a key factor in this work as a controlling parameter. Consequently, the approach of crosslinking gels with electric power is important for the controlled preparation of many new and nontraditional cross-linked gels for various applications.

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Synergism of nitrogen and reduced graphene in the electrocatalytic behavior of resorcinol - Formaldehyde based carbon aerogels

Cited by 30 publications

References 63 publications

Water-Ionic Liquid Binary Mixture Tailored Resorcinol-Formaldehyde Carbon Aerogels without Added Catalyst

Water-Ionic Liquid Binary Mixture Tailored Resorcinol-Formaldehyde Carbon Aerogels without Added Catalyst

Thermal degradation of crab shell biomass, a nitrogen-containing carbon precursor

Using electric power to synthesize resorcinol‐formaldehyde gels with enhanced characteristics

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