A general strategy to synthesize high-level N-doped porous carbons <i>via</i> Schiff-base chemistry for supercapacitors

Zhu, Duanwei; Jiang, Juxiang; Sun, Dongmei; Qian, Xiaoyu; Wang, Yawei; Li, Liangchun; Wang, Zhiwei; Chai, Xiaolan; Gan, Lihua; Liu, Mingxian

doi:10.1039/c8ta02341g

Cited by 135 publications

(59 citation statements)

References 67 publications

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“…All the spectra show two characteristic peaks, the D peak (approximately 1326 cm −1 ) and G peak (1590 cm −1 ), which indicate a disordered and graphitic carbon structure. The I D /I G ratios of N‐CMS, Co/N‐CMS, and Co/N‐CLPC are 0.46, 0.51, and 0.58, respectively (Figure D‐F and Table ); a higher value indicates a higher density of carbon defects . The “disorder” in Co/N‐CMS and Co/N‐CLPC originates from the incorporation of more Co ions, as well as defects and residual nitrogen functionalities, because Co/N doping decreased the degree of structural order of the carbon lattice.…”

Section: Resultsmentioning

confidence: 99%

In situ self‐template synthesis of cobalt/nitrogen‐doped nanocarbons with controllable shapes for oxygen reduction reaction and supercapacitors

Liu

Jiang

et al. 2019

Int J Energy Res

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Summary Shape‐controlled Co/N‐doped nanocarbons derived from polyacrylonitrile (PAN) were synthesized by a one‐step in situ self‐template method followed by a pyrolysis procedure. This is the first study to tune the nanostructure of Co/N‐doped carbon materials by providing a metal salt as the template and additive. The moderate surface area (699.47 m2 g−1), highly developed pore structure, homogenous Co and N doping and designed “egg‐box” structure impart Co/N‐doped cross‐linked porous carbon (Co/N‐CLPC) with excellent electrocatalytic activity and capacitive performance. This material displayed an onset potential of 0.805 V (vs RHE), a current density of −5.102 mA cm−2, excellent long‐term durability, and good resistance to methanol crossover, which are comparable with the characteristics of a commercial 20‐wt% Pt/C catalyst. In addition, Co/N‐CLPC demonstrated a high specific capacitance of 313 F g−1 at 0.5 A g−1, notable rate performance of 63% at 50 A g−1, and good cycling stability of 104.8% retention after 5000 cycles when used as a supercapacitor electrode. This method enables new routes to obtaining Co/N‐doped nanocarbons with shape‐controlled structures for energy conversion and storage applications.

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Section: Resultsmentioning

confidence: 99%

In situ self‐template synthesis of cobalt/nitrogen‐doped nanocarbons with controllable shapes for oxygen reduction reaction and supercapacitors

Liu

Jiang

et al. 2019

Int J Energy Res

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“…The amorphous nature of the materials can be inferred from the presence of two broad peaks centered on 25° and 43° in the powder X‐ray diffraction (PXRD) patterns (Figure b). These peaks may be assigned to the (002) and (100) graphitic planes of disordered carbon materials …”

Section: Resultsmentioning

confidence: 99%

“…These peaks may be assigned to the (002) and (100) graphitic planes of disordered carbon materials. [34] The heteroatom surface functionalities giving rise to the defects in the material were also investigated by X-ray photoelectron spectroscopy (XPS). As illustrated in full scan XPS survey spectra (Figure 4a), CTS-X-700 contains carbon, nitrogen and oxygen species.…”

Section: Resultsmentioning

confidence: 99%

“…[33] For example, Liu et al developed a simple Schiff base polymer derived N-doped porous carbon spheres via equivalent ratio of KOH activation with high surface area and capacitance value of 292 F g À 1 . [34] In another example, Shim and co-workers have reported a series of microporous carbon materials derived from a triazine-based covalent organic polymer which displayed the highest specific capacitance of 278 F g À 1 . [35] Also, MacFarlane and his group have reported the increase of surface area and specific capacitance after KOH activation of a microporous polymer organic framework.…”

Section: Introductionmentioning

confidence: 99%

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Microporous Organic Polymer‐Derived Nitrogen‐Doped Porous Carbon Spheres for Efficient Capacitive Energy Storage

et al. 2019

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A facile and template‐free synthetic approach was utilized to obtain a series of nitrogen and oxygen‐doped microporous carbon spheres (CTS‐X‐700) from carbazole‐terephthalaldehyde based co‐polymer spheres (CTS). The inherent spherical morphology of the co‐polymer remained intact even after activation at high temperature (700 °C). The synthesized materials exhibit BET surface area of up to 1340 m2 g−1 with an interconnected porous network consisting of ultramicropores and supermicropores along with a small amount of mesopores. Moreover, a good balance of heteroatom surface functionalities (N content up to 3.2 % and O content up to 12 %) was maintained without compromising the porosity by systematically varying the activation conditions. These features result in a high specific capacitance value of 407 F g−1 at 1.0 A g−1 in aqueous acid electrolyte with a three‐electrode system and superior cycle stability of 100 % capacitance retention even after 10000 cycles. Furthermore, the high energy density (10.6 W h kg−1 at a current density of 0.5 A g−1) in an aqueous electrolyte of the assembled supercapacitor device further demonstrates the possible applications of the synthesized materials as high‐performance energy storage devices.

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“…The synthesis of uniform nanoporous carbon materials in general remained a challenge until the templating strategy was proposed by Knox et al The core idea of the templating strategy is to use a template (organic or inorganic compound) as a place holder what later becomes a void space in the matrix materials. Until now, uniform porous carbon materials with pore size differ from micropore (<2 nm), mesopore (2–50 nm) to macropore (>50 nm) have been successfully synthesized by using various templates . According to the templating concept, simply by mixing two different templates one should be able to get structures with dual porosity.…”

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confidence: 99%

Centrifugal Field Guided Dual Templating Synthesis of Functional Macro‐Microporous Carbon

Chen

Lou

et al. 2018

Part & Part Syst Charact

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Due to the important role of porous carbon in the development of sustainable materials, the synthesis of porous carbon materials with various pore structures and pore sizes is intensively developed. But it is still not an easy task to obtain uniform porous structures at different nanoscales, let alone the hierarchical structures which combine different uniform porosity. The objective of this paper is to investigate if centrifugal field is applicable in the synthesis of ordered macro‐microporous carbon structures and the performance of the obtained porous carbon used as the cathode of a lithium–oxygen cell. It is found that a centrifugal force can trap the nucleation and growth of ZIF‐8 nanocrystals in between the interstices of close‐packed polymeric spheres, and therefore result in ordered macro‐microporous carbon nanoparticles with smaller pores distributed in the wall of larger pores. The dual porosity structures significantly help the macro‐microporous carbon to deliver a much higher capacity when used as the cathodes of a lithium–oxygen battery.

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A general strategy to synthesize high-level N-doped porous carbons via Schiff-base chemistry for supercapacitors

Abstract: A general Schiff-base strategy was developed to efficiently synthesize high-level N-doped porous carbons with tunable geometry and pore structure for supercapacitors.

Cited by 135 publications

References 67 publications

In situ self‐template synthesis of cobalt/nitrogen‐doped nanocarbons with controllable shapes for oxygen reduction reaction and supercapacitors

In situ self‐template synthesis of cobalt/nitrogen‐doped nanocarbons with controllable shapes for oxygen reduction reaction and supercapacitors

Microporous Organic Polymer‐Derived Nitrogen‐Doped Porous Carbon Spheres for Efficient Capacitive Energy Storage

Centrifugal Field Guided Dual Templating Synthesis of Functional Macro‐Microporous Carbon

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