Mechanically activated carbonized rayon fibers as an electrochemical supercapacitor in aqueous solutions

Vujković, Milica; Matović, Ljiljana; Krstić, Jugoslav; Stojmenović, Marija; Đukić, Anđelka; Babić, Biljana; Mentus, Slavko

doi:10.1016/j.electacta.2017.06.018

Cited by 28 publications

(17 citation statements)

References 65 publications

(118 reference statements)

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“…Similar behavior was described previously in aqueous solutions of polypyrrole with and without chitosan, in which the redox‐inactive chitosan increased the capacity of polypyrrole significantly . Notably, ball‐milling tends to increase the hydrophilicity of carbon materials, although to a low extent …”

Section: Resultssupporting

confidence: 81%

Interplay of Porosity, Wettability, and Redox Activity as Determining Factors for Lithium–Organic Electrochemical Energy Storage Using Biomolecules

2020

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Although several recent publications describe cathodes for electrochemical energy storage materials made from regrown biomass in aqueous electrolytes, their transfer to lithium–organic batteries is challenging. To gain a deeper understanding, we investigate the influences on charge storage in model systems based on biomass‐derived, redox‐active compounds and comparable structures. Hybrid materials from these model polymers and porous carbon are compared to determine precisely the causes of exceptional capacity in lithium–organic systems. Besides redox activity, particularly, wettability influences capacity of the composites greatly. Furthermore, in addition to biomass‐derived molecules with catechol functionalities, which are described commonly as redox‐active species in lithium–bio‐organic systems, we further describe guaiacol groups as a promising alternative for the first time and compare the performance of the respective compounds.

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Section: Resultssupporting

confidence: 81%

Interplay of Porosity, Wettability, and Redox Activity as Determining Factors for Lithium–Organic Electrochemical Energy Storage Using Biomolecules

2020

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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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“…Surface properties serve an important role in adsorption process, especially the effective specific surface area . In order to evaluate the impact of the ZIF‐67 growth on the specific surface areas of final composite membranes, the adsorption–desorption of nitrogen at 77 K was studied as indicated in Figure .…”

Section: Resultsmentioning

confidence: 99%

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

Hou

Zhou

Jin

et al. 2018

Part & Part Syst Charact

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The zeolitic imidazolate framework‐67 (ZIF‐67)‐based “pearl‐necklace‐like” composite membranes are prepared by in situ intergrown on the surface of 2‐methylimidazole/cellulose acetate (MIM/CA) electrospun nanofibers for the first time. With the aid of MIM, the ZIF‐67 nanocrystals successfully grow throughout the composites and attach to the fibers just like the pearls in necklace. The incubation time of ZIF‐67 has a significant influence on the structures and properties of the composites. And with an approximate saturation of ZIF‐67 nanocrystals, the integrated composites achieve a much higher surface area of 463.1 m2 g−1, which is as dozens of times as that of pure MIM/CA electrospun nanofibers (6.9 m2 g−1). In addition, the composites performed a high Cu(II) and Cr(VI) adsorption of 18.9 mg g−1 and 14.5 mg g−1, respectively. The adsorption data are well fitted with the pseudo‐second‐order kinetics. Moreover, adsorption mechanism is also discussed, and the electrostatic adsorption and ions exchange contribute to the high adsorption of Cu(II) and Cr(VI), and the existence of Cr(III) indicates that the Cr(VI) ions are partially reduced to Cr(III) during the adsorption. Therefore, the fabricated metal organic framework‐composite membrane with special “pearl‐necklace‐like” is a promising environmental material for removing heavy metal ions from water.

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Mechanically activated carbonized rayon fibers as an electrochemical supercapacitor in aqueous solutions

Abstract: Mechanically activated carbonized rayon fibers as an electrochemical supercapacitor in aqueous solutions, Electrochimica Actahttp://dx.

Cited by 28 publications

References 65 publications

Interplay of Porosity, Wettability, and Redox Activity as Determining Factors for Lithium–Organic Electrochemical Energy Storage Using Biomolecules

Interplay of Porosity, Wettability, and Redox Activity as Determining Factors for Lithium–Organic Electrochemical Energy Storage Using Biomolecules

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

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

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Mechanically activated carbonized rayon fibers as an electrochemical supercapacitor in aqueous solutions

Abstract: Mechanically activated carbonized rayon fibers as an electrochemical supercapacitor in aqueous solutions, Electrochimica Actahttp://dx.

Cited by 28 publications

References 65 publications

Interplay of Porosity, Wettability, and Redox Activity as Determining Factors for Lithium–Organic Electrochemical Energy Storage Using Biomolecules

Interplay of Porosity, Wettability, and Redox Activity as Determining Factors for Lithium–Organic Electrochemical Energy Storage Using Biomolecules

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

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

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