A universal KOH-free strategy towards nitrogen-doped carbon nanosheets for high-rate and high-energy storage devices

Yuan, Gang; Huang, Wanwen; Guan, Kaixiu; Li, Huimin; Xie, Yingjun; Liang, Yeru; Liu, Yingliang; Zheng, Mingtao

doi:10.1039/c9ta10179a

Cited by 32 publications

(15 citation statements)

References 54 publications

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“…Obviously, the XPS curves of WHC, AWHC, AAWHC demonstrate that some N atoms were introduced into AWHC by the first activation (nitric acid activation), but almost the entire amount of N atoms was removed by the KOH activation process. Briefly, compared with WHC, AWHC possesses a higher nitrogen content, the doped N atoms can improve the active sites, pore size, and interlayer spacing to accelerate electrolyte ion transmission [57,58]. To further confirm the structural features of all samples, Raman spectra was conducted.…”

Section: Resultsmentioning

confidence: 99%

Nanoporous Carbon Derived from Green Material by an Ordered Activation Method and Its High Capacitance for Energy Storage

Zhou

Chen

et al. 2020

Nanomaterials

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Carbon materials have been widely used as electrode materials for supercapacitors, while the current carbon precursors are mainly derived from fossil fuels. Biomass-derived carbon materials have become new and effective materials for electrodes of supercapacitors due to their sustainability, low pollution potential, and abundant reserves. Herein, we present a new biomass carbon material derived from water hyacinth by a novel activation method (combination of KOH and HNO3 activation). According to the electrochemical measurements, the material presents an ultrahigh capacitance of 374 F g−1 (the current density is 1 A g−1). Furthermore, the material demonstrates excellent rate performance (105 F g−1 at a higher density of 20 A g−1) and ideal cycling stability (87.3% capacity retention after 5000 times charge–discharge at 2 A g−1). When used for a symmetrical supercapacitor device, the material also shows a relatively high capacity of 330 F g−1 at 1 A g−1 (a two-electrode system). All measurements suggest the material is an effective and noteworthy material for the electrodes of supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Nanoporous Carbon Derived from Green Material by an Ordered Activation Method and Its High Capacitance for Energy Storage

Zhou

Chen

et al. 2020

Nanomaterials

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“…340 F g −1 at a current density of 0.5 A g −1 with excellent rate capability retaining a high capacitance of 282 F g −1 at a very high current density of 50 A g −1 without any loss of capacitance attenuation after 20,000 charge−discharge cycles in 6 M KOH aqueous electrolyte. In the symmetrical cell, they successfully recorded a maximum energy density of 55.5 W h kg −1 at 369 W kg −1 in 1.0 M LiPF 6 electrolyte [146]. Hierarchical micro-mesoporous carbon (HPC−2) derived from Sichuan pepper has recently been reported by Zhang and coworkers [147].…”

Section: Nanoporous Carbons From Natural Biomassmentioning

confidence: 96%

“…20.15 Wh kg −1 at power densities of 500 Wh kg −1 and only 0.1% capacity was lost after 4000 charging−discharging cycles [145]. Very recently, Zheng and co-workers have reported nitrogen-doped 2D carbon nanosheets using peanut dregs, soybean meal, and rapeseed dregs as carbon sources by KOH-free method [146]. They have introduced the saponification method to regulate the microstructure and components of carbon materials for the first time and novel mild activation agents such as potassium oxalate monohydrate and dicyandiamide were used to activate the char, which resulted in the formation of carbon nanosheet with high surface area (2470 m 2 g −1 ).…”

Section: Nanoporous Carbons From Natural Biomassmentioning

confidence: 99%

Nanoarchitectonics of Nanoporous Carbon Materials in Supercapacitors Applications

et al. 2020

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High surface area and large pore volume carbon materials having hierarchical nanoporous structure are required in high performance supercapacitors. Such nanoporous carbon materials can be fabricated from organic precursors with high carbon content, such as synthetic biomass or agricultural wastes containing cellulose, hemicellulose, and lignin. Using recently developed unique concept of materials nanoarchitectonics, high performance porous carbons with controllable surface area, pore size distribution, and hierarchy in nanoporous structure can be fabricated. In this review, we will overview the recent trends and advancements on the synthetic methods for the production of hierarchical porous carbons with one- to three-dimensional network structure with superior performance in supercapacitors applications. We highlight the promising scope of accessing nanoporous graphitic carbon materials from: (i) direct conversion of single crystalline self-assembled fullerene nanomaterials and metal organic frameworks, (ii) hard- and soft-templating routes, and (iii) the direct carbonization and/or activation of biomass or agricultural wastes as non-templating routes. We discuss the appealing points of the different synthetic carbon sources and natural precursor raw−materials derived nanoporous carbon materials in supercapacitors applications.

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“…ZnCl 2 contributes to creating a porous structure acting as a template; intercalated ZnCl 2 upon washing creates the void space in the carbon matrix. Recently, using various agricultural wastes or biomass such as rice husks [38], corncob [39,40], pistachio shell [41], pitch [42], bamboo [43], Batata leaves and stalks [44], Peanut dregs [45], Lapsi seed (Choerospondias axillaris) [46], etc. high surface area nanoporous carbons with large porosity, interconnected mesopores and uniform pore size distribution essentially required in supercapacitor applications have been produced.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Carbon Materials Derived from Washnut Seed with Enhanced Supercapacitance

Shrestha

Tamrakar

et al. 2020

Materials

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Nanoporous activated carbons-derived from agro-waste have been useful as suitable and scalable low-cost electrode materials in supercapacitors applications because of their better surface area and porosity compared to the commercial activated carbons. In this paper, the production of nanoporous carbons by zinc chloride activation of Washnut seed at different temperatures (400–1000 °C) and their electrochemical supercapacitance performances in aqueous electrolyte (1 M H2SO4) are reported. The prepared nanoporous carbon materials exhibit hierarchical micro- and meso-pore architectures. The surface area and porosity increase with the carbonization temperature and achieved the highest values at 800 °C. The surface area was found in the range of 922–1309 m2 g−1. Similarly, pore volume was found in the range of 0.577–0.789 cm3 g−1. The optimal sample obtained at 800 °C showed excellent electrochemical energy storage supercapacitance performance. Specific capacitance of the electrode was calculated 225.1 F g−1 at a low current density of 1 A g−1. An observed 69.6% capacitance retention at 20 A g−1 indicates a high-rate capability of the electrode materials. The cycling stability test up to 10,000 cycles revealed the outstanding stability of 98%. The fascinating surface textural properties with outstanding electrochemical performance reveal that Washnut seed would be a feasible agro-waste precursor to prepare nanoporous carbon materials as a low-cost and scalable supercapacitor electrode.

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A universal KOH-free strategy towards nitrogen-doped carbon nanosheets for high-rate and high-energy storage devices

Abstract: A universal KOH-free strategy is developed to prepare nitrogen-doped carbon nanosheets (N-SCNSs) derived from edible oil residues with high specific surface area and high nitrogen content for application in high-rate and high-energy supercapacitors.

Cited by 32 publications

References 54 publications

Nanoporous Carbon Derived from Green Material by an Ordered Activation Method and Its High Capacitance for Energy Storage

Nanoporous Carbon Derived from Green Material by an Ordered Activation Method and Its High Capacitance for Energy Storage

Nanoarchitectonics of Nanoporous Carbon Materials in Supercapacitors Applications

Nanoporous Carbon Materials Derived from Washnut Seed with Enhanced Supercapacitance

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