Templated Synthesis of Exfoliated Porous Carbon with Dominant Graphitic Nitrogen

Doustkhah, Esmail; Kotb, Ahmed; Tafazoli, Saeede; Balkan, Timuçin; Kaya, Sarp; Hanaor, Dorian; Assadi, M. Hussein N.

doi:10.1021/acsmaterialsau.2c00074

Cited by 9 publications

(5 citation statements)

References 52 publications

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“…In our previous investigation, we utilised layered silicate as a 2D nanospace for the synthesis of carbon nitride with a ratio of C 6 N (g-CN) and showed that this material is an excellent option for catalysis and supercapacitor applications. We also identified a thermodynamically stable configuration for C 6 N [ 18 ]. Here, we evaluated the capability of synthesised nanoporous g-CN as a template for the oriented growth of metallic Pt.…”

Section: Resultsmentioning

confidence: 99%

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Metal–Support Interaction in Pt Nanodisk–Carbon Nitride Catalyst: Insight from Theory and Experiment

Doustkhah,

Kotb,

Balkan

et al. 2024

Nanomaterials

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Metal–support interaction plays a critical role in determining the eventual catalytic activity of metals loaded on supporting substrates. This interaction can sometimes cause a significant drop in the metallic property of the loaded metal and, hence, a drop in catalytic activity in the reactions, especially in those for which low charge carrier transfer resistance is a necessary parameter. Therefore, there should be a case-by-case experimental or theoretical (or both) in-depth investigation to understand the role of support on each metal. Here, onto a layered porous carbon nitride (g-CN), we grew single crystalline Pt nanodisks (Pt@g-CN) with a lateral average size of 21 nm, followed by various characterisations such as electron microscopy techniques, and the measurement of electrocatalytic activity in the O2 reduction reaction (ORR). We found that intercalating Pt nanodisks in the g-CN interlayers causes an increase in electrocatalytic activity. We investigated the bonding mechanism between carbon support and platinum using density functional theory and applied the d-band theory to understand the catalytic performance. Analysis of Pt’s density of states and electronic population across layers sheds light on the catalytic behaviour of Pt nanoparticles, particularly in relation to their thickness and proximity to the g-CN support interface. Our simulation reveals an optimum thickness of ~11 Å, under which the catalytic performance deteriorates.

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Section: Resultsmentioning

confidence: 99%

“…The synthesis of g-CN was performed according to the literature published elsewhere [ 18 ]. After the synthesis of g-CN, for Pt growth in the interlayers, the obtained g-CN (3.5 mg) was dispersed in the DMF (20 mL) and sonicated with a probe sonicator for 2 h. Then, the Pt(acac) 2 was added to the g-CN dispersion.…”

Section: Methodsmentioning

confidence: 99%

Metal–Support Interaction in Pt Nanodisk–Carbon Nitride Catalyst: Insight from Theory and Experiment

Doustkhah,

Kotb,

Balkan

et al. 2024

Nanomaterials

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“…These templates direct the growth of porous structures, which can then be obtained by removing the templates. For example, porous TiO 2 , C 3 N 4 , Fe 2 O 3 , and graphene have been successfully synthesized using the template approach and applied to various photocatalytic applications such as pollutant degradation and H 2 production [8,[133][134][135].…”

Section: The Role Of Photocatalysts In Hydrogen Productionmentioning

confidence: 99%

Hydrogen Production Using Modern Photocatalysts

Wawrzyńczak,

Feliczak-Guzik

2024

Coatings

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Fossil fuels play a powerful role in the global economy and are therefore referred to as strategic raw materials. However, their massive use around the world is associated with concerns about the sufficiency of energy sources for future generations. Currently, fossil fuel resources are heavily depleted, with limited supplies. According to forecasts, the demand for energy will constantly increase, so it is necessary to find a solution that reconciles the ever-increasing demand for energy with the need to protect the environment. The main solution to this problem is to acquire energy from renewable resources, especially in the direction of obtaining alternative substitutes for transportation fuels. One of the main alternative fuels that can replace existing fossil fuels is hydrogen. An efficient way to obtain this compound is through the use of modern photocatalysts. Hence, the purpose of this paper is to review the recent literature on the effective use of catalysts in photocatalytic processes (e.g., glycerol conversion) that enable the synthesis of hydrogen.

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“…As shown in Figure 6, three peaks at 398 eV, 400 eV, and 401 eV are identified, corresponding to pyridinic nitrogen (N-6), pyrrolic nitrogen (N-5), and graphitic nitrogen (NÀ Q), respectively. [30][31][32] The quantitative concentrations of each peak are depicted in Figure 7a. As for the g-X, the percentage content of N-6 exceeds 52 %, and that of N-5 exceeds 27.5 %.…”

Section: Elemental Compositionmentioning

confidence: 99%

Porous Carbons Prepared from Polyacrylonitrile Doped with Graphitic Carbon Nitride or Melamine for Supercapacitor Applications

Fu,

Li,

Yan

et al. 2023

ChemistrySelect

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Melamine and graphitic carbon nitride (g‐C3N4) obtained by thermal condensation of melamine were doped in polyacrylonitrile (PAN) films. Nitrogen‐doped porous carbons were then prepared by pyrolysis of the composite films. Though all the porous carbons had a high nitrogen content of at least 10 %, g‐C3N4 was more efficient than melamine in nitrogen doping. The nitrogen content was elevated with the increase of the amount of each dopant, the highest value of 19.0 % was achieved by g‐3 (porous carbon obtained from the PAN/g‐C3N4 composite film with a mass ratio of 3). Amongst the nitrogen functionalities, pyridinic‐N and pyrrolic‐N held a percentage of at least 80 %. Compared with the carbon materials obtained from melamine doped PAN films, those from g‐C3N4 doped ones exhibited larger surface area and average pore size, and higher pore volume. The difference mainly resulted from the thermostability and size of the dopants. The g‐C3N4 doped materials thus presented more excellent electrochemical properties. The specific capacitance of g‐3 electrode was 135.3 F/g at a current density of 0.5 A/g. Rather than melamine, g‐C3N4 could improve the chemical composition and textural properties of the carbon materials, thus enhancing their supercapacitor performance.

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Templated Synthesis of Exfoliated Porous Carbon with Dominant Graphitic Nitrogen

Cited by 9 publications

References 52 publications

Metal–Support Interaction in Pt Nanodisk–Carbon Nitride Catalyst: Insight from Theory and Experiment

Metal–Support Interaction in Pt Nanodisk–Carbon Nitride Catalyst: Insight from Theory and Experiment

Hydrogen Production Using Modern Photocatalysts

Porous Carbons Prepared from Polyacrylonitrile Doped with Graphitic Carbon Nitride or Melamine for Supercapacitor Applications

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