Chemoselective solution synthesis of pyrazolic-structure-rich nitrogen-doped graphene for supercapacitors and electrocatalysis

Wang, Xiaoqian; Ding, Yujia; Han, Lu; Chen, Fang; Zhang, Ning; Ma, Mingming

doi:10.1016/j.cej.2018.04.163

Cited by 41 publications

(23 citation statements)

References 59 publications

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“…The peaks at 398.5 and 400.5 eV correspond to pyridinic N and pyrrolic N, respectively, which enable high chemical activities . The peak at 401.8 eV is attributed to the graphitic N, which can improve the conductivity of CNTs . The XPS results indicate that the N‐doping in the CNT and the existence of interaction among Mo 2 C, N‐doped CNT, and MoO x , are favorable for the electron transfer in Mo 2 C@CNTs.…”

Section: Resultsmentioning

confidence: 98%

Mo₂C Nanodots Anchored on N‐Doped Porous CNT Microspheres as Electrode for Efficient Li‐Ion Storage

Chen

Yang

et al. 2018

Small Methods

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For the first time, red‐blood‐cell‐like porous Mo2C@CNT microspheres are synthesized through a facile and scalable spray‐drying approach. As an anode for the lithium‐ion (Li‐ion) battery (LIB), the Mo2C@CNT hybrid demonstrates superior electrochemical performances with a high reversible capacity of 1065 mAh g−1 after 100 cycles at 0.1 A g−1, a large and stable capacity of 878 mAh g−1 even after 750 cycles at 1.6 A g−1, and large capabilities of 460 and 190 mAh g−1 after 100 cycles even at 8.0 and 16.0 A g−1, respectively, suggesting the outstanding long‐cycle high‐rate performance. The superior Li‐ion storage is attributed to the unique porous hierarchical structure, as constructed with Mo2C nanodots homogeneously and tightly anchored on a porous and highly conductive N‐doped carbon nanotubes (CNTs) microspheric skeleton, which provides abundant electrochemically active sites and facilitates the electron and ion transportation. This work provides a novel, scalable, and cost‐effective route to the hybrid of transition‐metal‐based compounds and carbonaceous nanomaterials as high‐performance electrode for LIBs.

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Section: Resultsmentioning

confidence: 98%

Mo₂C Nanodots Anchored on N‐Doped Porous CNT Microspheres as Electrode for Efficient Li‐Ion Storage

Chen

Yang

et al. 2018

Small Methods

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“…[46] Attractively,H OPC based ZIC also exhibits an excellent cycle stability with ac apacity retention of about 100 %u pon 20 000 charging/discharging cycles (Figure 6e). Moreover,c onsidering the electrodes with large areas and high areal mass loadings are highly desired for practical applications, [43,47,48] ap ouch-cell device was assembled ( Figure 6f,g). Even with al arge area of 4 6cm 2 and ah igh areal mass loading of 10 mg cm À2 ,t he pouch-cell ZIC delivers ah igh volumetric capacity of 149 mA hcm À3 at 1Ag À1 ,a nd can work well throughout 1000 charging/discharging cycles (Figure 6h).…”

Section: Forschungsartikelmentioning

confidence: 99%

Maximization of Spatial Charge Density: An Approach to Ultrahigh Energy Density of Capacitive Charge Storage

Chen

et al. 2020

Angewandte Chemie

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Capacitive energy storage has advantages of high power density, long lifespan, and good safety, but is restricted by low energy density. Inspired by the charge storage mechanism of batteries, a spatial charge density (SCD) maximization strategy is developed to compensate this shortage by densely and neatly packing ionic charges in capacitive materials. A record high SCD (ca. 550 C cm−3) was achieved by balancing the valance and size of charge‐carrier ions and matching the ion sizes with the pore structure of electrode materials, nearly five times higher than those of conventional ones (ca. 120 C cm−3). The maximization of SCD was confirmed by Monte Carlo calculations, molecular dynamics simulations, and in situ electrochemical Raman spectroscopy. A full‐cell supercapacitor was further constructed; it delivers an ultrahigh energy density of 165 Wh L−1 at a power density of 150 WL−1 and retains 120 Wh L−1 even at 36 kW L−1, opening a pathway towards high‐energy‐density capacitive energy storage.

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“…[4][5][6] As one major type of SCs, electric double layer capacitors (EDLCs) exhibit great application potential due to its long cyclic stability and high power density because its energy storage is based on the electric polarization and the adsorption of ions between the interface of electrode surface and electrolyte. [8][9][10][11][12] It is worth noting that graphene has attracted a research Xiangli Gao and Wenhui Ma have the same contribution. [8][9][10][11][12] It is worth noting that graphene has attracted a research Xiangli Gao and Wenhui Ma have the same contribution.…”

Section: Introductionmentioning

confidence: 99%

“…7 Carbonaceous materials such as carbon aerogel, activated carbon, carbon nanotube, and graphene are usually considered as the most promising electrode materials for EDLCs. [8][9][10][11][12] It is worth noting that graphene has attracted a research Xiangli Gao and Wenhui Ma have the same contribution. upsurge for EDLCs because of its high theoretical specific surface area (SSA), high thermal conductivity, and good electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

Gao

Han

et al. 2019

Int J Energy Res

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Summary By using oxalic acid (OA) as template and reducer, a novel approach is developed to prepare reduced graphene oxide films with capsular pores (C‐rGOFs) under a hydrothermal condition. The effect of preparation conditions including concentrations of OA and reaction temperatures on the films' structure and capacitive performances has been systematically investigated. The optimal C‐rGOF shows uniform capsule‐like morphology and exhibits a density of 1.18 g cm−3. Tested by using a two‐electrode system, the optimal film shows gravimetric specific capacitance of about 234.9 F g−1 and volumetric specific capacitance of 277.2 F cm−3. Additionally, the optimal film which shows good rate capability can retain 63.9% of initial capacitance at high scan rate of 1.0 V s−1, which is much higher than that of the controlling reduced graphene oxide film (rGOF, 180.5 F g−1, 373.6 F cm−3 and retain only 45.0% of its initial capacitance at 1.0 V s−1). The cells assembled by the optimal C‐rGOF exhibit maximum energy density of 7.5 Wh kg−1, power density of 16.9 kW kg−1, and excellent cycling stability with 91.2% capacitance retention after 21 000 cycles. It is believed that this method can be developed as a useful strategy to prepare rGO‐based materials for energy storage applications.

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Chemoselective solution synthesis of pyrazolic-structure-rich nitrogen-doped graphene for supercapacitors and electrocatalysis

Cited by 41 publications

References 59 publications

Mo₂C Nanodots Anchored on N‐Doped Porous CNT Microspheres as Electrode for Efficient Li‐Ion Storage

Mo₂C Nanodots Anchored on N‐Doped Porous CNT Microspheres as Electrode for Efficient Li‐Ion Storage

Maximization of Spatial Charge Density: An Approach to Ultrahigh Energy Density of Capacitive Charge Storage

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

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Chemoselective solution synthesis of pyrazolic-structure-rich nitrogen-doped graphene for supercapacitors and electrocatalysis

Cited by 41 publications

References 59 publications

Mo2C Nanodots Anchored on N‐Doped Porous CNT Microspheres as Electrode for Efficient Li‐Ion Storage

Mo2C Nanodots Anchored on N‐Doped Porous CNT Microspheres as Electrode for Efficient Li‐Ion Storage

Maximization of Spatial Charge Density: An Approach to Ultrahigh Energy Density of Capacitive Charge Storage

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

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Mo₂C Nanodots Anchored on N‐Doped Porous CNT Microspheres as Electrode for Efficient Li‐Ion Storage

Mo₂C Nanodots Anchored on N‐Doped Porous CNT Microspheres as Electrode for Efficient Li‐Ion Storage