Flexible and cross-linked N-doped carbon nanofiber network for high performance freestanding supercapacitor electrode

Cheng, Yongliang; Huang, Liang; Xu, Xiao; Yao, Bin; Yuan, Longyan; Li, Tianqi; Hu, Zhimi; Wang, Bo; Wan, Jun; Zhou, Jun

doi:10.1016/j.nanoen.2015.04.007

Cited by 383 publications

(181 citation statements)

References 64 publications

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“…All spectra curves contain wileyonlinelibrary.com a semicircle in the high-frequency region and a straight line in the low-frequency region, indicating that the electrochemical process is controlled by both charge transfer and Na-ion diffusion. [38,39] The diameter of the semicircle represents the charge transfer impedance (R ct ), [40] the simulation results summarized in Table S3 (Supporting Information) show that the R ct for NaVPO 4 F/C with the carbon contents of 2.58, 4.93, and 7.32 wt% are around 598, 454, and 204 Ω, respectively. This result confirm that carbon improved the conductivity of NaVPO 4 F, according with the rate performance of them.…”

Section: Na Storage Mechanism and Electrochemical Evaluationmentioning

confidence: 99%

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Electrospun NaVPO₄F/C Nanofibers as Self‐Standing Cathode Material for Ultralong Cycle Life Na‐Ion Batteries

Jin

Liu

et al. 2017

Advanced Energy Materials

221

143

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Cathode materials mainly include transition metal oxide compounds, [11][12][13][14][15] polyanionic compounds, [16][17][18][19][20][21][22][23] Prussian blue analogues, and organic materials. [24][25][26][27][28] Among the various cathode materials for SIBs, polyanion-based cathode materials possess stable 3D host framework structure due to strong covalent bonding of oxygen atom in the polyanion polyhedra, resulting in their excellent thermal stability and long cycle life. [29] More importantly, this open 3D framework could provide enough interstitial channels for Na + transit and buffer severe volume change during Na + insertion/extraction. Particularly, NaVPO 4 F has attracted a great deal of interests owing to the low-cost raw materials, safe application, and high working potential. NaVPO 4 F was first proposed by Barker et al., [30] which possesses a tetragonal symmetry structure (space group I4/mmm). The crystal structure is consistent with the sodium aluminum fluorophosphate (Na 3 Al 2 (PO 4 ) 2 F 3 ). When used as cathode for Na-ion batteries, it delivered a discharge capacity of 82 mA h g −1 . However, the capacity faded more than 50% after 30 cycles. To improve the cyclability and rate performance, many strategies, including coating with conductive materials, fabricating pores, and doping alien ions have been attempted. [31][32][33] Although these attempts improve the electrochemical property of NaVPO 4 F in a certain degree, the capacity of the reported NaVPO 4 F materials is far below its theoretical specific capacity and still could not meet the application requirements in Na-storage. The root problem is traditional technology for preparing NaVPO 4 F mainly based on the high-temperature solid-state reaction, sol-gel method, and hydrothermal method, which often produce bulk or micrometer-sized NaVPO 4 F particles with insufficient carbon coating, leading to rapid capacity fading since this structure is unfavorable to electron transfer and the permeation of electrolyte. [31,32,34] Hence, it is significant to enhance the kinetics of Na-ion transfer in NaVPO 4 F. In order to achieve this goal, strategies mainly include decreasing the crystallite size and altering morphology of the material. [7,22,35,36] As far as we know, electrospinning is a versatile technique to prepare various 1D carbon-containing composites and produce flexible membrane, [6,8,[37][38][39] which encourages us to fabricate NaVPO 4 F with novel morphology combined the method of electrospinning to improve its electrochemical performance.Herein, we first synthesized 1D NaVPO 4 F/C nanostructure via an electrospinning method. Such a structure combines a variety of advantages for battery electrodes: (I) the small nanoparticles (≈6 nm) shorten the length of Na-ion transport; (II) NaVPO 4 F has received a great deal of attention as cathode material for Na-ion batteries due to its high theoretical capacity (143 mA h g −1 ), high voltage platform, and structural stability. Novel NaVPO 4 F/C nanofibers are successfully prepared via a feasible el...

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Section: Na Storage Mechanism and Electrochemical Evaluationmentioning

confidence: 99%

“…[40][41][42] When used as a cathode for Na-ion batteries, the as-synthesized NaVPO 4 F/C nanofibers exhibit excellent reversible capacity, superior rate capability, and ultralong cyclability.…”

Section: Introductionmentioning

confidence: 99%

Electrospun NaVPO₄F/C Nanofibers as Self‐Standing Cathode Material for Ultralong Cycle Life Na‐Ion Batteries

Jin

Liu

et al. 2017

Advanced Energy Materials

221

143

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“…The supercapacitor device based on the material exhibits a high energy density of 5.9 W h kg -1 with a power density of 1200 W kg -1 , and an excellent cycling stability (106% capacitance retention after 20 000 charge/discharge cycles). [221] Also, 3D CNF architectures grown with metal oxides, hydroxides, sulfides, or conductive polymers can be used for the electrodes of supercapacitors. For example, Li et al demonstrated that 3D CNF array electrodeposited with MnO 2 film (a thickness of ≈7.5 nm) has a remarkable capacitance of 365 F g -1 in 0.10 m Na 2 SO 4 aqueous solution.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Macroscopic‐Scale Three‐Dimensional Carbon Nanofiber Architectures for Electrochemical Energy Storage Devices

Chen

Feng

Liang

et al. 2017

Advanced Energy Materials

158

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Therefore, it is necessary to develop highperformance energy storage devices for facilitating the effective utilization of intermittent renewable energy sources. [7][8][9] Among varieties of electrochemical energy storage devices, supercapacitors (known as electrochemical capacitors) [10,11] and some rechargeable batteries (lithium-ion batteries (LIBs), lithiumsulfur (Li-S) batteries, and metal-O 2 batteries) [12][13][14][15] are at the frontier, because they can transport high power and store high energy. Nowadays, they play an indispensable role in our daily life by powering numerous portable electronic devices (e.g., cell phones and laptops), hybrid electric vehicles, and large-scale electrical grids. [16][17][18][19] It is well accepted that the performance of energy storage devices mainly depended on their electrode materials. [20,21] Owing to the advantages of large surface area, light weight, good electrical conductivity, and high thermal/ chemical stability, carbon materials have been considered as the most important electrode materials of supercapacitors and rechargeable batteries [8,20,21] Hence, various nanostructured carbons, such as carbon/graphene quantum dots, [22,23] carbon nanofiber (CNFs), [16,24] carbon nanotubes (CNTs), [13,25] graphene [26][27][28][29][30][31][32] carbon nanosheets, [33,34] 3D carbon nanostructures, [35][36][37] and porous carbon, [38,39] have gained great attention. Among these materials, 3D carbon nanomaterials have some advantages. The interlinked architecture not only shortens transport distances for ions in the well-interconnected wall structure, but also provides a continuous pathway endowing for the fast electron transport. [40] Moreover, the structural interconnectivities guarantee higher electrical conductivity and better mechanical stability. [36,41] Thereby, the design and fabrication of various 3D carbonbased nanostructures, including carbon nanotube networks, graphene gels, graphene foams, and 3D CNFs, have been intensively investigated.Over the past few years, there are many reviews summarizing the progress of fabricating 3D carbon-based nanomaterials. For example, Schneider et al. overviewed the recent advance in the synthesis of 3D arranged carbon nanotube architectures. [42] Li et al. reviewed the carbon-based 3D nanostructures for supercapacitors. [36] Cao and Gui et al. comprehensively reviewed the recent progress in synthesis, properties, and energy applications of CNT sponges, aerogels, and hierarchical composites. [43] The development of high-performance electrochemical energy storage devices is critical for addressing energy crises and environmental pollution.

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“…Generally, pure GR possesses unsatisfactory capacitive properties resulting from the partial sacrice of specic surface area during the formation of irreversible agglomerates. 15 For this reason, GR is usually used to form composites with pseudocapacitor electrode materials to achieve excellent capacitive properties.…”

Section: -7mentioning

confidence: 99%

Free-standing graphene/bismuth vanadate monolith composite as a binder-free electrode for symmetrical supercapacitors

Deng

Liu

et al. 2018

RSC Adv.

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Preparation of new types of electrode material is of great importance to supercapacitors. Herein, a graphene/bismuth vanadate (GR/BiVO 4 ) free-standing monolith composite has been prepared via a hydrothermal process. Flexible GR sheets act as a skeleton in the GR/BiVO 4 monolith composites.When used as a binder-free electrode in a three-electrode system, the GR/BiVO 4 composite electrode can provide an impressive specific capacitance of 479 F g À1 in a potential window of À1.1 to 0.7 V vs. SCE at a current density of 5 A g À1. A symmetrical supercapacitor cell which can be reversibly chargeddischarged at a cell voltage of 1.6 V has been assembled based on this GR/BiVO 4 monolith composite.The symmetrical capacitor can deliver an energy density of 45.69 W h kg À1 at a power density of 800 W kg À1. Moreover, it ensures rapid energy delivery of 10.75 W h kg À1 with a power density of 40 kW kg À1 .

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Flexible and cross-linked N-doped carbon nanofiber network for high performance freestanding supercapacitor electrode

Cited by 383 publications

References 64 publications

Electrospun NaVPO₄F/C Nanofibers as Self‐Standing Cathode Material for Ultralong Cycle Life Na‐Ion Batteries

Electrospun NaVPO₄F/C Nanofibers as Self‐Standing Cathode Material for Ultralong Cycle Life Na‐Ion Batteries

Macroscopic‐Scale Three‐Dimensional Carbon Nanofiber Architectures for Electrochemical Energy Storage Devices

Free-standing graphene/bismuth vanadate monolith composite as a binder-free electrode for symmetrical supercapacitors

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Flexible and cross-linked N-doped carbon nanofiber network for high performance freestanding supercapacitor electrode

Cited by 383 publications

References 64 publications

Electrospun NaVPO4F/C Nanofibers as Self‐Standing Cathode Material for Ultralong Cycle Life Na‐Ion Batteries

Electrospun NaVPO4F/C Nanofibers as Self‐Standing Cathode Material for Ultralong Cycle Life Na‐Ion Batteries

Macroscopic‐Scale Three‐Dimensional Carbon Nanofiber Architectures for Electrochemical Energy Storage Devices

Free-standing graphene/bismuth vanadate monolith composite as a binder-free electrode for symmetrical supercapacitors

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Electrospun NaVPO₄F/C Nanofibers as Self‐Standing Cathode Material for Ultralong Cycle Life Na‐Ion Batteries

Electrospun NaVPO₄F/C Nanofibers as Self‐Standing Cathode Material for Ultralong Cycle Life Na‐Ion Batteries