Mechanochemistry induced pore regulation and pyridinic nitrogen doping in anthracite derived carbon for sodium storage

Gao, Xinmei; Shen, Zhimeng; Chang, Gaobo; Li, Zhong; Zhao, Hanqing

doi:10.1016/j.diamond.2022.109481

Cited by 8 publications

(13 citation statements)

References 60 publications

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“…Moreover, the surface composition of structures was further confirmed by O 1s XPS spectra (Figure S3). All of the structures from three experiments had three chemical states of oxygen at ∼531.4, ∼532.5, and ∼536.7 eV, which indicated the presence of O–H/Si–O, C–O, and chemisorbed oxygen/water, respectively. − The XPS results verified that growth methods did not exhibit a significant difference in terms of chemical composition and bond formation.…”

Section: Resultsmentioning

confidence: 62%

Comparative Evaluation of Chemical Garden Growth Techniques

Aslanbay Guler,

Demirel,

Imamoglu

2023

Langmuir

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Chemical gardens are an exciting area of selforganized precipitation structures that form nano-and micro-sized structures in different shapes. This field has attracted great interest from researchers due to the specific characteristics and potential applications of these structures. Today, research on chemical gardens has provided deeper information regarding the formation mechanisms of these structures, and several techniques have been developed for chemical garden growth. However, they all show different growth patterns and lead to the formation of structures with a variety of morphological, chemical, or physical properties. This study aimed to evaluate the effects of different production techniques on chemical garden growth, taking into consideration the growth patterns, morphology, microstructure, and chemical composition. The chemical garden structures obtained in seed and injection experiments, two common methods, showed highly similar surface structures, void formation, and chemical composition. The membrane growth method has a small number of applications; thus, it was comprehensively evaluated to add new insights to the existing limited data. It produced the most stable and standard structures in a flat sheet-like shape and showed different morphologies than those observed in other two methods. Overall, this study presented significant results about the effect of growth techniques on chemical garden structures and similar systems.

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Section: Resultsmentioning

confidence: 62%

Comparative Evaluation of Chemical Garden Growth Techniques

Aslanbay Guler,

Demirel,

Imamoglu

2023

Langmuir

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“…Interestingly, the capacities of both electrodes are gradually increased after ∼100 cycles, and this behavior could be caused by the formation of the surface layer due to the electrolyte decomposition. The layer formed on the electrode provides an extra ion storage site, leading to an increase in specific capacity. ,, …”

Section: Resultsmentioning

confidence: 99%

“…The larger capacities in the sloping region were due to the higher N atomic content and increased surface area (Figures 4b,S6). [29][30][31]60,61 More pyridinic-N and graphitic-N in M1000W resulted in the exposure of more active sites for Li ions and enhanced electronic conductivity. 29−34 Therefore, facile redox reactions could be achieved, particularly at high current densities.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Moreover, the conformations of the nitrogen atoms were distinctly different. Pyridinic nitrogen is known to facilitate the efficient transport of Li ions by providing stable active sites for Li ions, and graphitic nitrogen enhances electronic conductivity. − Finally, the electrochemical properties of microwave-heated carbon materials were assessed to investigate their suitability as anode materials. Carbon materials produced via microwave heating exhibited remarkable advantages over those produced via thermal convection, in terms of their reversible capacities and rate performance.…”

Section: Introductionmentioning

confidence: 99%

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Microwave-Mediated Stabilization and Carbonization of Polyacrylonitrile/Super-P Composite: Carbon Anodes with High Nitrogen Content for Lithium Ion Batteries

Park,

Lee,

Park

et al. 2023

Chem. Mater.

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Most synthetic carbonaceous anode materials for lithium-ion batteries (LIBs) are fabricated through a two-step heat-treatment process involving stabilization and carbonization. In this study, the stabilization and carbonization processes were accomplished via microwave treatment in significantly reduced time to fabricate carbonaceous anode materials for LIBs. Polymeric precursors for carbon materials, such as polyacrylonitrile (PAN), cannot be heat treated via the microwave because of their weak microwave-absorption properties. To address the issue, Super-P, carbon nanoparticles with an excellent microwave absorbing property, was adopted as a microwave initiator. On mixing a small amount of Super-P with PAN, Super-P acted as an efficient microwave absorber, and the temperature of the PAN/Super-P composite rapidly increased upon microwave treatment. Consequently, the stabilization time was reduced from 60 to 30 min when microwave irradiation was used to heat the PAN/Super-P composite. More significantly, the carbon sample could be fabricated by using only 1 min of microwave treatment, whereas convection heating required more than 200 min. Additionally, the carbonaceous materials obtained after microwave heating over shorter time periods were endowed with a high nitrogen content. The nitrogen content of microwave-heated carbon was 8.89%, whereas that of the convection carbonized counterpart was only 4.63%. Both pyridinic and graphitic nitrogen, which have been reported to improve the electrochemical performance, were noticeably higher in microwave-heated carbon. The synthesized microwave-assisted carbon material exhibited notable enhancements in the reversible capacity, rate performance, and cyclic stability. In summary, microwave-assisted stabilization and carbonization techniques offer options for the fast production of carbon anodes with excellent electrochemical performance and may be used for developing practical and high-performance battery anodes.

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“…That is to say, there are natural energy-storage active regions. [19][20][21] But, from a previous report, hard carbon (amorphous carbon) was composed of ve-, six-, seven-and eightmember carbon rings with diverse bond lengths and bond angles. 22 Unstable six-member rings cannot store ions effectively, so pyrolysis is necessary to produce more graphitized microcrystals with better ion-storage capabilities.…”

Section: Introductionmentioning

confidence: 99%