Supercapacitance of nitrogen-sulfur-oxygen co-doped 3D hierarchical porous carbon in aqueous and organic electrolyte

Yang, Wang; Yang, Wu; Song, Ailing; Gao, Lijun; Su, Li; Shao, Guangjie

doi:10.1016/j.jpowsour.2017.05.108

Cited by 123 publications

(50 citation statements)

References 56 publications

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“…The GCD curves of the samples at 1.5 A g À1 (Fig. 3(b)) demonstrate that the NCs shows more non-linear characteristics than the C-700, further revealing the pseudo-capacitive feature generated from the doping elements, 34 which is consistent with the CV result. CV curves of NC-700 at different scan rates from 5 mV s À1 to 100 mV s À1 are presented in Fig.…”

Section: Resultssupporting

confidence: 80%

“…To date, heteroatoms such as boron, nitrogen, oxygen, sulfur and phosphorus have been incorporated into porous carbon materials. [13][14][15][16][17] The incorporation of heteroatoms, such as nitrogen, into carbon materials can affect the electrondonor characteristics of carbon materials, thus improving the capacitive behavior of supercapacitors. Moreover, the nitrogencontaining functional groups can also improve the wettability of carbon materials to electrolyte solution.…”

Section: Introductionmentioning

confidence: 99%

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Facile synthesis of nitrogen-doped porous carbon for high-performance supercapacitors

Yang

Kong

et al. 2017

RSC Adv.

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Section: Resultssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Facile synthesis of nitrogen-doped porous carbon for high-performance supercapacitors

Yang

Kong

et al. 2017

RSC Adv.

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“…32 To quantitatively investigate the porous texture of PCs, the pore size distribution and the resultant pore parameters determined by DFT model were presented in Figure 4B and Table 1. It is generally accepted that electrolyte ions are primarily accumulated at micropores, and the presence of mesopores and macropores can act as bridges to shorten the diffusion distance, and also act as reservoirs to alleviate ions diffusion congestion, particularly at high current loads.…”

Section: Physicochemical Properties Of Pcsmentioning

confidence: 99%

“…It is generally accepted that electrolyte ions are primarily accumulated at micropores, and the presence of mesopores and macropores can act as bridges to shorten the diffusion distance, and also act as reservoirs to alleviate ions diffusion congestion, particularly at high current loads. 32 To quantitatively investigate the porous texture of PCs, the pore size distribution and the resultant pore parameters determined by DFT model were presented in Figure 4B and Table 1. PC-Cu-C possessed higher SSA (2010 m 2 g −1 ) and total pore volume (0.85 cm 3 g −1 ) compared with PC-Cu (1535 m 2 g −1 together with 0.65 cm 3 g −1 ).…”

Section: Physicochemical Properties Of Pcsmentioning

confidence: 99%

Rapid synthesis of chitin‐based porous carbons with high yield, high nitrogen retention, and low cost for high‐rate supercapacitors

et al. 2019

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It is a great challenge to simultaneously achieve high yield, high nitrogen retention, and low cost for chitin-based porous carbons (PCs) while obtaining highly porous structure. Herein, copper (II) chloride dihydrate (CuCl 2 2H 2 O) is innovatively used as the microwave absorber and also porogen for direct synthesis of PCs from chitin via microwave heating. A very short duration of 10 minutes is achieved for this synthesis, because microwave irradiation renders a rapid heating rate of 126°C min −1 during the initial 5 minutes. In addition, the melted CuCl 2 wraps the chitin to preserve its overall structure during synthesis, thus obtaining a yield as high as 36% and a nitrogen retention up to 5.2%. Furthermore, a low temperature of about 600°C that triggers the redox reactions of CuCl 2 into Cu to achieve well-developed porous structure (specific surface area up to 1535 m 2 g −1 ) is observed, suggesting a merit of low cost for this synthesis. The PC-based electrode exhibits not only a high specific capacitance of 227 F g −1 at 0.5 A g −1 in 6 mol L −1 KOH electrolyte but also a good rate capability with a high capacitance retention of 67.7% even at an ultrahigh current density of 50 A g −1 . Owing to these promising capacitive performances of PCs, the fabricated supercapacitor can remain 70.1% of the energy density when the power density was dramatically increased by 20 times.KEYWORDS chitin-based carbon, CuCl 2 porogen, high-rate supercapacitor, microwave-assisted synthesis, electrode material

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“…[4,5] Mesopores provide low-resistance pathways for ions transport, but the limited SSA provided by mesopores is unable to provide high specific capacitance. [6] Macropores can act as reservoirs to reduce the diffusion distances of ions between an electrolyte and the pores in PC. [7,8] Previous studies have demonstrated that oxygen functional groups can improve the wettability of PC surfaces and directly participate in redox reactions to contribute pseudo-capacitance.…”

Section: Introductionmentioning

confidence: 99%

Direct Microwave Conversion from Lignin to Micro/Meso/Macroporous Carbon for High‐Performance Symmetric Supercapacitors

et al. 2019

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Enzymatic hydrolysis lignin (EHL) is a common biomass that is difficult to use for the synthesis of porous carbon (PC) via direct microwave heating because it absorbs very little microwave energy. In this study, a novel method was developed to synthesize high‐performance PC directly from EHL using only 8 min of microwave heating. The resulting PC exhibits a high specific surface area of 2482 m2 g−1 and a hierarchical pore distribution with a high mesopore content of 35.6 % and oxygen content of 17.1 %. Nitrogen (as a protecting gas) passes through water molecules provided by steam to absorb microwave energy and acts as a physical porogen to form mesopores. Using solid KOH allows one to bypass the time‐consuming drying process and generate sufficient micropores. Additionally, fast self‐pyrolysis and a high heating rate lead to the generation of both mesopores and macropores in a PC framework. Furthermore, multiple active centers can be formed during microwave heating and subsequently stabilized by oxidation once the PC is exposed to an air atmosphere, resulting in the attachment of oxygen functional groups to the PC surface. Based on these desirable physicochemical characteristics, the PC electrodes fabricated in this study exhibit a high specific capacitance of 338 F g−1 at 1 A g−1 and high capacitance retention of 86 % at 10 A g−1. The final PC‐based supercapacitor delivers a maximum energy density of 17.1 Wh kg−1 in a Na2SO4 electrolyte and 8.6 Wh kg−1 in a KOH electrolyte.

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Supercapacitance of nitrogen-sulfur-oxygen co-doped 3D hierarchical porous carbon in aqueous and organic electrolyte

Cited by 123 publications

References 56 publications

Facile synthesis of nitrogen-doped porous carbon for high-performance supercapacitors

Facile synthesis of nitrogen-doped porous carbon for high-performance supercapacitors

Rapid synthesis of chitin‐based porous carbons with high yield, high nitrogen retention, and low cost for high‐rate supercapacitors

Direct Microwave Conversion from Lignin to Micro/Meso/Macroporous Carbon for High‐Performance Symmetric Supercapacitors

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