Facile synthesis of B/N co-doped 2D porous carbon nanosheets derived from ammonium humate for supercapacitor electrodes

Geng, Qian; Huang, Guangxu; Liu, Yingbin; Li, Yuanyuan; Liu, Longhui; Yang, Xiaohui; Wang, Qi; Zhang, Chuanxiang

doi:10.1016/j.electacta.2018.12.038

Cited by 63 publications

(11 citation statements)

References 83 publications

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“…The capacitance ( C , F g –1 ) was calculated according to the equation C = I Δ t /(Δ Vm ), where I is the discharge current (A), Δ t is the discharge time (s), Δ V is the voltage range (V), and m is the mass (g) of the carbon material. The complex form of capacitance C (ω) is dependent upon the real part of the cell capacitance C ′(ω) and the imaginary part C ″(ω) related to the losses of energy dissipation and frequency, which can be defined as follows: , C (ω) = C ′(ω) – jC ″(ω), C ′(ω) = − Z ″(ω)/[ω| C (ω)| 2 ], and C ″(ω) = Z ′(ω)/[ω| C (ω)| 2 ], where Z ′(ω) and − Z ″(ω) are the real and imaginary parts of the complex impedance Z (ω), respectively. ω is the angular frequency given by ω = 2π f .…”

Section: Methodsmentioning

confidence: 99%

“…The capacitance (C, F g −1 ) was calculated according to the equation C = IΔt/(ΔVm), where I is the discharge current (A), Δt is the discharge time (s), ΔV is the voltage range (V), and m is the mass (g) of the carbon material. The complex form of capacitance C(ω) is dependent upon the real part of the cell capacitance C′(ω) and the imaginary part C″(ω) related to the losses of energy dissipation and frequency, which can be defined as follows: 51,52…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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N–O–S Co-doped Hierarchical Porous Carbons Derived from Calcium Lignosulfonate for High-Performance Supercapacitors

Liu

Huang

et al. 2020

Energy Fuels

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We propose a simple and low-cost synthesis of N–O–S co-doped hierarchical porous carbons (MGC-x) by direct carbonization of calcium lignosulfonate. MGC-x possesses a large surface area (∼1500 m2 g–1) and high mesopore ratio (>40%) and heteroatom content. In the three-electrode system, MGC-700 and MGC-800 exhibit high specific capacitances of 417 and 312 F g–1 at 0.5 A g–1 and 184 and 170 F g–1 even at 100 A g–1 using a 1 M H2SO4 electrolyte. Notably, there exists a critical current density when evaluating the rate capability of MGC-x electrodes, which is closely correlated to their ion diffusion and electron transport properties. In two-electrode configuration with a 3 M KOH electrolyte, MGC-700 with ultrahigh mass loading (∼13 mg cm–2, ∼210 μm) can deliver large specific capacitance of 249 F g–1 and excellent rate capability with capacitance retention of 81.9% from 0.05 to 20 A g–1. MGC-700 and MGC-800 both show superb cycling stabilities with 94 and 98% of original capacitances being retained after 10 000 cycles, respectively. Furthermore, the MGC-700-based supercapacitor with commercial-level electrode mass loading yields an impressive energy density of 7.2 Wh kg–1 at 62.5 W kg–1 and maintains 5.1 Wh kg–1 even at 4585.4 W kg–1. The MGC-800-based supercapacitor exhibits considerable energy densities of 26.7 and 9.8 Wh kg–1 at 309.8 and 7000 W kg–1 in a 1 M (C2H5)4NBF4/PC electrolyte, respectively, guaranteeing its utilization in high-performance supercapacitors.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

N–O–S Co-doped Hierarchical Porous Carbons Derived from Calcium Lignosulfonate for High-Performance Supercapacitors

Liu

Huang

et al. 2020

Energy Fuels

Self Cite

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“…(Ling et al, 2015;Zhang et al, 2015;Chen et al, 2017;Xia et al, 2017). Geng et al synthesized B, N dual doped 2D porous carbon nanosheets exhibited gravimetric capacitance of 311 F g −1 at 0.2 A g −1 (Geng et al, 2019). Guo et al prepared B, N dual doped porous carbon foam with an ultrahigh capacitance of 402 F g −1 at 0.5 A g −1 (Guo et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

B, N Dual Doped Coral-Like Carbon Framework With Superior Pseudocapacitance and Surface Wettability

et al. 2021

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Carbon-based materials are usually considered as conventional electrode materials for supercapacitors (SCs), therefore it is meaningful to enhance supercapacitive capacity and cycling stability via rational surface structure design of carbon-based materials. The bio-inspired coral-like porous carbon structure has attracted much attention recently in that it can offer large surface area for ion accommodation and favor ions-diffusion, promoting its energy storage capacity. Herein, we designed a superiorly hydrophilic B, N dual doped coral-like carbon framework (BN-CCF) and studied its surface wettability via low-field nuclear magnetic resonance relaxation technique. The unique coral-like micro-nano structure and B, N dual doping in carbon framework can enhance its pseudocapacitance and improve surface wettability. Therefore, when used as electrodes of SCs, the BN-CCF displays 457.5 F g−1 at 0.5 A g−1, even when current density increases 20 folds, it still exhibits high capacitance retention of 66.1% and superior cycling stability. The symmetrical SCs assembled by BN-CCF electrodes show a high energy density of 14.92 Wh kg−1 (600 W kg−1). In this work, simple structural regulation with B, N dual doping and surface wettability should be considered as effective strategy to enhance energy storage capacity of carbon-based SCs.

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“…Unfortunately, most of them used some strong corrosive etchants, such as KOH, NaOH, HNO 3 , and H 3 BO 3 . [ 12–25 ] Recently, Zinc chloride (ZnCl 2 ) has been widely used to activate the carbon materials to prepare electrode materials with larger specific surface area and proper pore size distribution for high‐performance supercapacitors. [ 24,26–30 ] It can give higher carbon yield through a dehydrating process allowing more carbon to remain in the structure.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen/Oxygen Enriched Hierarchical Porous Carbons Derived from Waste Peanut Shells Boosting Performance of Supercapacitors

Wen

Chi²,

Wen

et al. 2020

Adv Elect Materials

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conductivity, abundant morphology, large surface area, and tunable surface properties, porous carbons have been widely used as electrode materials for supercapacitors. [6-9] Various porous carbons have been fabricated from the green precursor of biomass, which exhibits outstanding performance in supercapacitors. Theoretically, the specific capacitance of a supercapacitor depends on the specific surface area of the carbonaceous electrode materials. The larger the surface area, the more the charge accumulated on the interface between the electrode and electrolyte distributions. [2,10,11] Up to now, massive works have been performed to activate the electrode materials to obtain a higher specific surface area. Unfortunately, most of them used some strong corrosive etchants, such as KOH, NaOH, HNO 3 , and H 3 BO 3. [12-25] Recently, Zinc chloride (ZnCl 2) has been widely used to activate the carbon materials to prepare electrode materials with larger specific surface area and proper pore size distribution for high-performance supercapacitors. [24,26-30] It can give higher carbon yield through a dehydrating process allowing more carbon to remain in the structure. [26,27] However, these traditional activation methods can improve the specific surface area of carbon materials at the cost of graphitization. [31] It is known that the electrical conductivity is vital to the electrochemical performance, especially for the rate capability in supercapacitors, which can be improved by increasing the graphitization degree of carbons. [32,33] Cobalt (Co) catalytic graphitization is an effective method to improve the graphitization of carbon materials. Jiang et al. used cobalt nitrate as the graphitization catalyst to synthesize partially graphitized ginkgo-based activated carbons showing a high performance of 178 F g −1 at a scan rate of 500 mV s −1. [32] Chang et al. reported a method of Co 2+ catalyzed graphitization and KOH activation, by which an interconnected nitrogen-doped hierarchical porous carbon with small mesopore size (2-4 nm) and high microporosity (86.8%) was synthesized from the biomass of Firmiana simplex fluff and exhibited an ultrahigh capacitance in supercapacitors. [34] It shows great advantages over the high-temperature treatment with high energy consumption and the related reduction of the surface area. Biomass is a kind of naturally abundant and costeffective precursors to prepare porous carbon materials for The high specific surface area and the fine electrical conductivity are the vital impacts, but they are always a pair of mutually counterbalancing factors in carbon-based supercapacitors. Herein, a facile strategy of the combined CoCl 2 catalytic graphitization and ZnCl 2 activation is applied to synthesize porous carbonaceous materials with enriched nitrogen and oxygen doping from a cheap and abundant biowaste of peanut shells. The as-produced carbon materials possess high surface area (1745-2257 m 2 g −1), naturally nitrogen/ oxygen co-doping, and hierarchical porous structure. These physicochemical p...

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Facile synthesis of B/N co-doped 2D porous carbon nanosheets derived from ammonium humate for supercapacitor electrodes

Cited by 63 publications

References 83 publications

N–O–S Co-doped Hierarchical Porous Carbons Derived from Calcium Lignosulfonate for High-Performance Supercapacitors

N–O–S Co-doped Hierarchical Porous Carbons Derived from Calcium Lignosulfonate for High-Performance Supercapacitors

B, N Dual Doped Coral-Like Carbon Framework With Superior Pseudocapacitance and Surface Wettability

Nitrogen/Oxygen Enriched Hierarchical Porous Carbons Derived from Waste Peanut Shells Boosting Performance of Supercapacitors

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