Asymmetric supercapacitors based on electrospun carbon nanofiber/sodium-pre-intercalated manganese oxide electrodes with high power and energy densities

Lin, Sung-Chyr; Lu, Yi-Ting; Chien, Yu‐An; Wang, Jeng-An; Chen, Po‐Yu; Chen‐Chi, M.; Hu, Chi‐Chang

doi:10.1016/j.jpowsour.2018.05.019

Cited by 46 publications

(19 citation statements)

References 40 publications

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“…The capacity retention of the supercapacitor can still retain at 94% after 2000 cycles, indicating the excellent long‐term cycling performance. As shown in Table 1 , compared with the materials in previous works such as Na x MnO 2 @CNF//AC, GF/CNT/MnO 2 //GF/CNT/PPy, MnO 2 /PPy//NC, and so on, although our results are not the most prominent compared with the work in references 31 or 34, the preparation process of electrode materials is simple, cheap and environmentally friendly. Therefore, the integrated electrochemical behaviors are promising to bridge the energy‐power gap between traditional batteries and capacitors.…”

Section: Resultsmentioning

confidence: 56%

High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

Jing

Fan

et al. 2019

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Based on the comparisons of current electrochemical energy storage systems (as shown in Table S1, Supporting Information), electrochemical supercapacitors have higher theoretical specific capacity due to the redox reaction at the interface of electrode material compared with traditional electrostatic capacitors, meanwhile it still can maintain high power density. Therefore, electrochemical supercapacitors (ECs) as alternative energy devices have the ability to bridge the energy-power gap between traditional electrostatic capacitors and Li-ion batteries, and attracted much attention in recent years due to their large current charge/discharge capability, high power density and outstanding cycle stability. [5,6] These merits are essential to accessory power sources, for instance, portable electronic devices, new energy vehicles, emergency power supply and military field and so on. Importantly, the new generation of energy storage devices not only need high power and light weight, but also need high energy density, environmental protection and sustainable development. [7,8] Up to now, although the commercial Li-ion batteries exhibit high energy density (e.g., LiFePO 4 , LNCMO), their cycle and power characteristics are not as good as those of supercapacitors (Table S2, Supporting Information). However, supercapacitors are not able to store the same amount of charge as Li-ion batteries do, which is usually 3-30 times lower. Thus, a major obstacle is how to increase the energy density of supercapacitors without sacrificing power density and cyclability. On the basis of the equation of energy density E = 1/2 CV 2 , the energy density (E) can be improved by increasing voltage window (V) or specific capacitance (C). The working voltage has proven to be mainly dependent on the electrolyte stability. [9][10][11][12] Although organic electrolytes have enhanced the operating voltage of supercapacitors, the high cost and toxicity limit their practical application. Nevertheless, water-based electrolytes pull down the energy density of supercapacitors because of the lower decomposition voltage of water (≈1.2 V). [13,14] In contrast, the all-solid-state asymmetric supercapacitors can extend working voltage windows through restraining the oxygen evolution A stable MnO x @C@MnO x core-shell heterostructure consisting of vertical MnO x nanosheets grown evenly on the surface of the MnO x @carbon nanowires are obtained by simple liquid phase method combined with thermal treatment. The hierarchical MnO x @C@MnO x heterostructure electrode possesses a high specific capacitance of 350 F g −1 and an excellent cycle performance owing to the existence of the pore structure among the ultrasmall MnO x nanoparticles and the rapid transmission of electrons between the active material and carbon coating layer. Particularly, according to the in situ Raman spectra analysis, no characteristic peaks corresponding to MnOOH are found during charging/discharging, indicating that pseudocapacitive behavior of the MnO x electrode have no relevance to the ...

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Section: Resultsmentioning

confidence: 56%

High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

Jing

Fan

et al. 2019

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“…Lin et al. [ 82,83 ] investigated the Na + /K + preintercalated δ‐phase MnO 2 as positive electrodes in asymmetric supercapacitors, they found that the crystallinity of MnO 2 materials was significantly reduced by the preintercalation of Na + /K + into its layered structure (Figure 5b), which benefited to the Na + /K + diffusion into/out the interlayer structure, leading to effective utilization of the active sites inside the crystal structure of MnO 2 cathode. Besides, the preintercalation effect is also significantly affected by the electrolyte compositions.…”

Section: Activating More Active Sites For Charge Storagementioning

confidence: 99%

Preintercalation Strategy in Manganese Oxides for Electrochemical Energy Storage: Review and Prospects

et al. 2020

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the past decades, some issues of MnO 2based cathodes still remain due to the low electronic conductivity, [19-21] low utilization of reversible discharge depth, [22,23] sluggish diffusion kinetics, [24-26] and poor structural stability upon cycling, [27-29] which restricts their practical application in the commercial secondary batteries. Taking the Zn-ion batteries as example, the MnO 2 cathode seriously suffer from the above issues, especially the sluggish Zn 2+ diffusion, [30] and structural collapse issue during H + /Zn 2+ intercalation/ extraction cycles. [31-33] Regarding these bottlenecks, researchers have strived to develop strategies that can realize optimizations in capacity, rate, and cycling properties of MnO 2 cathodes, such as surface coating, [34] metal-doping, [35] preintercalation, [36] etc. Among all the strategies, preintercalation strategy provides a basic and effective method for optimizing the structure and electrochemical performance of MnO 2-based cathodes. In recent years, the preintercalation strategy has attracted much attention as an effective approach to enhance the electrochemical performance of cathode materials, including vanadate, [37] manganese oxides, [23] layered LiCoO 2 , [38] etc. Several reviews and prospects have been conducted for MnO 2 materials. Some reviews have mentioned the electrochemical properties and correlated reaction mechanism of MnO 2 materials in aqueous Zn batteries, [29,39,40] and a review by Mai's group offers insights into the rational design of preintercalation electrodes in next-generation rechargeable batteries. [36] However, a review or prospect on the application and mechanism of the preintercalation strategy in MnO 2 materials for nextgeneration batteries is lacking. For MnO 2 electrode materials, many reports on improving the electrochemical properties of materials by applying preintercalation strategy have been emerged in the last 5 years (Table S1 in the Supporting Information). The main feature of the preintercalated MnO 2 materials is that some ions/molecules are preintercalated into the tunnel or interlayer hosts of MnO 2 materials prior to the battery cycling (or during synthesis process). These intercalated guest species, including ions, inorganic/organic molecules, as well as polymers, present electrostatic and physical interactions with the host framework and the inserted carrier ions via chemical bonding or coordination, presenting significant benefiting effect on the inherent structure of hosts and the transport kinetics of carrier ions. Generally, there are several Manganese oxides (MnO 2) are promising cathode materials for various kinds of battery applications, including Li-ion, Na-ion, Mg-ion, and Zn-ion batteries, etc., due to their low-cost and high-capacity. However, the practical application of MnO 2 cathodes has been restricted by some critical issues including low electronic conductivity, low utilization of discharge depth, sluggish diffusion kinetics, and structural instability upon cycling. Preintercalation of ions/molecules ...

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“…Due to the ever-increasing energy demand, developing efficient and environmentally friendly energy storage devices has become one of the major tasks among the researchers. Supercapacitors have been recognized as a reliable and efficient energy storage device in recent years [1][2][3]; however, the performance of supercapacitors must be significantly improved to fulfill the future global energy demand. Since the electrochemical properties of electrode play an important role in the overall performance of supercapacitor, the fabrication of high-performance electrode material with an excellent electrochemical performance is essential [1,4].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, transition metal oxides such as Co 3 O 4 , Fe 2 O 3 , RuO 2 , NiO, ZnO, TiO 2 , MgO, MnO 2 have been applied as electrode material for supercapacitors [1,3,5,6]. Among them, TiO 2 as one of the typical pseudocapacitance materials has attracted immense interest for supercapacitors due to its high stability, low-cost, excellent electrochemical stability, and nontoxicity [4,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…To overcome this problem, most of the reports have been focused on combining TiO 2 with conductive carbon materials such as carbon nanofibers [4], graphene [7], and carbon nanotubes [10]. The carbon nanofibers offer mechanical and physicochemical stability of the composite, as well as prevent the aggregation of metal oxide nanoparticles [3,11]. In addition, the carbon nanofibers possess high electrical conductivity, high charge transfer ability, large surface area and mesoporosity, and high electrolyte accessibility [12].…”

Section: Introductionmentioning

confidence: 99%

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Fe1−xS Modified TiO2 NPs Embedded Carbon Nanofiber Composite via Electrospinning: A Potential Electrode Material for Supercapacitors

Pant

Park

2020

Molecules

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Fe1−xS-TiO2 nanoparticles embedded carbon nanofibers (Fe1−xS-TiO2/CNFs) composite as a supercapacitor electrode material has been reported in the present work. The Fe1−xS-TiO2/CNFs composite was fabricated by electrospinning technique followed by carbonization under argon atmosphere and characterized by the state-of-art techniques. The electrochemical studies were carried out in a 2 M KOH electrolyte solution. The synthesized material showed a specific capacitance value of 138 F/g at the current density of 1 A/g. Further, the capacitance retention was about 83%. The obtained results indicate that the Fe1−xS-TiO2/CNFs composite can be recognized as electrode material in supercapacitor.

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Asymmetric supercapacitors based on electrospun carbon nanofiber/sodium-pre-intercalated manganese oxide electrodes with high power and energy densities

Cited by 46 publications

References 40 publications

High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

Preintercalation Strategy in Manganese Oxides for Electrochemical Energy Storage: Review and Prospects

Fe1−xS Modified TiO2 NPs Embedded Carbon Nanofiber Composite via Electrospinning: A Potential Electrode Material for Supercapacitors

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Asymmetric supercapacitors based on electrospun carbon nanofiber/sodium-pre-intercalated manganese oxide electrodes with high power and energy densities

Cited by 46 publications

References 40 publications

High‐Stability MnOxNanowires@C@MnOxNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

High‐Stability MnOxNanowires@C@MnOxNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

Preintercalation Strategy in Manganese Oxides for Electrochemical Energy Storage: Review and Prospects

Fe1−xS Modified TiO2 NPs Embedded Carbon Nanofiber Composite via Electrospinning: A Potential Electrode Material for Supercapacitors

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Product

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High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism