Core-shell N-doped active carbon fiber@graphene composites for aqueous symmetric supercapacitors with high-energy and high-power density

Xie, Qinxing; Bao, Rongrong; Xie, Chao; Zheng, Anran; Wu, Shuai; Zhang, Yufeng; Zhang, Renwei; Zhao, Peng

doi:10.1016/j.jpowsour.2016.03.099

Cited by 82 publications

(27 citation statements)

References 48 publications

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“…The symmetric SC shows a maximum specific energy of 30.69 Wh kg −1 , which decreases to 15.45 Wh kg −1 as the specific power increases from 200 to 3200 W kg −1 . As seen in the Ragone plot, the obtained value of specific energy is higher than that for some recently reported symmetric and asymmetric SCs . Previously, we reported the RuCo 2 O 4 based asymmetric SCs, where we obtained the highest specific energy of 32.6 Wh kg −1 at 0.6 A g −1 current density .…”

Section: Resultscontrasting

confidence: 45%

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Chodankar

Dubal

et al. 2018

Adv Materials Inter

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Consequently, many different materials, including carbon, [2] metal oxides, [3] metal sulfides, [4] and conducting polymers, [5] have been assessed for SC applications in order to achieve electrodes with the desired electrochemical properties. Particularly, the redox chemistry of an electrode material strongly affects its electrochemical properties. Considering the importance of redox chemistry in SCs, electrode materials based on redox-rich mixed-transition-metal oxides such as MCo 2 O 4 , MFe 2 O 4 , and MMn 2 O 4 (where M is a metal cation) have been extensively tested in SCs owing to their multiple oxidation states and superior electrical conductivities, specific capacitances, and electrochemical stabilities as compared to those their parent unitary metal oxides. [6] Consequently, several mixed-transitionmetal oxides with different compositions, such as NiCo 2 O 4 , FeCo 2 O 4 , CoFe 2 O 4 , and NiMn 2 O 4 , have already been assessed for application as SC materials. [7][8][9][10] However, among these possible compositions, NiCo 2 O 4 has been the most studied. [11] Cationic substitution of the Co content in MCo 2 O 4 -based electrodes by any new metal cation having a different oxidation state will effectively improve its electrochemical performance. Therefore, it is necessary to test some advanced Co-replacing metal cations. In that respect, RuCo 2 O 4 provides better electrochemical results as both the metal cations have different oxidation states and high electrical conductivity. [12] The problem with the production of Ru/Co-based materials is the high cost of the raw materials. Consequently, researchers are constantly trying to find cheaper alternatives to Ru/Co-based materials. However, there is no doubt that Ru/Co-based metal oxides exhibit superior supercapacitive properties in terms of electrical conductivity, specific capacitance, and cycling stability. More importantly, the different oxidations states of the Ru and Co metal cations improve energy storing capacity, while the higher electrical conductivity supports fast charge-transfer processes. Thus, the aim of the present work was to combine Ru and Co metal cations in a single electrode to take full advantage of both metal cations.In this work, novel thin films composed of RuCo 2 O 4 nanobelts have been grown on low-cost stainless steel mesh The superfast (≈30 min) and template-free electrochemical approach is developed to prepare the unique nanobelts-architectured RuCo 2 O 4 thin films over the stainless steel mesh substrates. The vertically aligned and interconnected RuCo 2 O 4 nanobelts present sufficient interspace to provide more electroactive sites and shorten the diffusion path for electrolyte ions. Owing to their unique nanostructure and higher electrical conductivity, the RuCo 2 O 4 nanobelts exhibit excellent electrochemical features, including a specific capacitance of 1447 F g −1 , and excellent electrochemical stability (82.25% retention over 16 000 cycles). Additional electrochemical kinetic analysis is carried out to confirm whet...

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Section: Resultscontrasting

confidence: 45%

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Chodankar

Dubal

et al. 2018

Adv Materials Inter

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“…Nitrogen doping can improve the wettability of composites, and the higher surfacea rea provides more active sites for charge transfer,j ointly improving the electrochemical properties. [33] To fully investigate CNT@N-PC, the CV curves of CNT@N-PC composites at sweep rates rangingf rom 5t o 200 mV s À1 are presented in Figure4c. No pronounced reversible redox is observed in the CV curves as the sweep rate in-creased, indicating fast ion transport and as mall resistance in the composite material.…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanotube@N‐Doped Mesoporous Carbon Composite Material for Supercapacitor Electrodes

Chen

et al. 2019

Chemistry An Asian Journal

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Here, carbon nanotube@N-doped mesoporous carbon (CNT@N-PC) composites were synthesized by using resorcinol-formaldehyde resin as carbons ource,i onic liquids (ILs) as template, and nitrogens ourcesa nd tetraethyl orthosilicate (TEOS) as assistant agent.T he use of ILs-modified CNT with nitrogen and TEOS facilitated the generation of a richer mesoporous structure. Theo btained CNT@N-PC was composed of aC NT core and mesoporous carbon particles around it.C NT@N-PC showed a3 Dn etwork structure like "dewy cobwebs" and had ah igh surface area of 857 m 2 g À1 , uniform pore size distribution (3.0 nm), ands uitable Nc ontent (4.9 at.%). When used as supercapacitor electrode, the CNT@N-PC exhibited ah igh specific capacitance (244 Fg À1 at 1Ag À1 ), good rate capability and favorable capacitance retention (92.5 %c apacitive retention after 5000 cycles), demonstrating the potentialf or application in high-performance supercapacitors.[a] X.

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“…This effect was named as the "CO 2 inner-activation effect" [12], which can beconfirmed by the Nitrogen adsorption-desorption results. Additionally, macroporesand large mesoporescan serve on ion-buffering reservoirs and increase the accessibility of the smaller pores [13], in terms of improving the rate performance. To further determine the porous structure of SCF, Nitrogen (77 K) adsorption-desorption is performed, showing that the BET specific surface area and pore volume of SCF reaches 1693 m 2 ·g −1 and 1.106 cm 3 ·g −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of 3D Hierarchically Porous Carbon Foam as Supercapacitor Electrode Material

Gao

Cai

et al. 2018

Applied Sciences

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A hierarchically porous 3D starch-derived carbon foam (SCF) with a high specific surface area (up to 1693 m 2 ·g −1 ) was first prepared by a facile solvothermal treatment, in which Na 2 CO 3 is used as both the template and activating agent. The hierarchically porous structure and high specific area endow the SCF with favorable electrochemical properties such as a high specific capacitance of 179.6 F·g −1 at 0.5 A·g −1 and a great rate capability and cycling stability, which suggest that the material can be a promising candidate for energy storage applications.

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Core-shell N-doped active carbon fiber@graphene composites for aqueous symmetric supercapacitors with high-energy and high-power density

Cited by 82 publications

References 48 publications

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Carbon Nanotube@N‐Doped Mesoporous Carbon Composite Material for Supercapacitor Electrodes

Facile Fabrication of 3D Hierarchically Porous Carbon Foam as Supercapacitor Electrode Material

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Core-shell N-doped active carbon fiber@graphene composites for aqueous symmetric supercapacitors with high-energy and high-power density

Cited by 82 publications

References 48 publications

Superfast Electrodeposition of Newly Developed RuCo2O4 Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Superfast Electrodeposition of Newly Developed RuCo2O4 Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Carbon Nanotube@N‐Doped Mesoporous Carbon Composite Material for Supercapacitor Electrodes

Facile Fabrication of 3D Hierarchically Porous Carbon Foam as Supercapacitor Electrode Material

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Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor