Facile fabrication of well-defined microtubular carbonized kapok fiber/NiO composites as electrode material for supercapacitor

Xu, Weibing; Mu, Bin; Wang, Aiqin

doi:10.1016/j.electacta.2016.02.072

Cited by 59 publications

(22 citation statements)

References 52 publications

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“…In the case of Pollen-B and precursor of P-NiO, the mass loss before 160 o C was due to the elimination of the adsorbed water and intercalated water, while the mass loss between 160 o C and 490 o C was ascribed to the decomposition of organic components. [44,46] It is worth noting that no obvious mass loss is observed after 490 o C, indicating the calcination of 500 o C is perfect enough to completely remove the pollen grains in P-NiO. Last but not least, the barely unobserved mass loss of P-NiO in TGA curves indicating the high thermal stability of our sample.…”

Section: Two-electrode System Configurationmentioning

confidence: 86%

“…The cycling stability was measured in the Battery Testing System (Neware, CT-4008). The energy density E (Wh kg -1 ) and power density P (W kg -1 ) was calculated according to the following formulas: [44,45] (1)…”

Section: Two-electrode System Configurationmentioning

confidence: 99%

“…The asymmetric device reveals a high energy density of 66.4 Wh kg -1 at 1136.6 W kg -1 and a high power density of 22.0 kW kg -1 at 34.5 Wh kg -1 , suggesting the promising applications in energy storage. [44,53,62,65,67,70,83] Considering the calculation of energy/power density is highly depending on the whole electrode mass, it still has much room for the improvement of energy/power density by employing other cathode electrode materials with high electrochemical performance.…”

Section: Two-electrode Systemmentioning

confidence: 99%

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Pollen-inspired synthesis of porous and hollow NiO elliptical microstructures assembled from nanosheets for high-performance electrochemical energy storage

Wang

Xin

et al. 2017

Chemical Engineering Journal

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Numerous efforts have recently been focused on designing and synthesizing efficient nanostructures electrode materials for high-efficiency energy storage. Herein, hierarchical porous and hollow NiO elliptical microstructures constructed from nanosheets are synthesized by utilizing the renewable, cost-effective and widespread native rape pollen grains as template. Benefiting from the unique morphology, pollen-templated NiO shows outstanding electrochemical performances as electrode of supercapacitor, such as high specific capacitance (198.7 mAh g-1 at 1 Ag-1), excellent rate capability (89.2 mAh g-1 at 30 Ag-1) and long cycling life. Besides, asymmetric supercapacitor device was assembled by using pollen-templated NiO and activated carbon, which deliver excellent cycling stability (103.3% retention after 10000 cycles) as well as high energy/power density (a high energy density of 66.4 Wh kg-1 and power density of 22.2 kW kg-1). Moreover, the low-cost pollen template-based strategy is found to be a versatile method to prepare other porous and hollow elliptical microstructure of transition-metal oxides.

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Section: Two-electrode System Configurationmentioning

confidence: 86%

Section: Two-electrode System Configurationmentioning

confidence: 99%

Section: Two-electrode Systemmentioning

confidence: 99%

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Pollen-inspired synthesis of porous and hollow NiO elliptical microstructures assembled from nanosheets for high-performance electrochemical energy storage

Wang

Xin

et al. 2017

Chemical Engineering Journal

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“…Nevertheless, the intrinsic high electrical resistances of nickel oxides restrict their charge-discharge rate in a higher current density which is adverse for high-power energy storage applications. Based on this consideration, many researchers have fabricated a mass of composite materials by adding the highconductivity carbon-based materials, such as three-dimensional carbon nanotube networks supported nickel oxide [5] , carbon nanotubes/NiO nanocomposites [6] , microtubular carbonized kapok fiber/NiO composites [7] . Although these composites can improve the electrical conductivity to some extent, the effect is still unsatisfactory.…”

Section: Introductionmentioning

confidence: 99%

Liquid phase synthesis of dendritic nickel carbide alloy with high conductivity for advanced energy storage

Liu

et al. 2017

Journal of Energy Chemistry

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“…Hollow tubular carbonized KF/NiO composites were prepared by a facile hydrothermal and carbonization procedure using KF as bio-template. [117] The porous KF-based carbon network can protect metal ions from oxidation, effectively restricting nanoparticle growth and improving the electronic conductivity of the active materials for facile mass and charge transfer. Due to their unique microtubular structure, the as-prepared composites exhibited a high C sp of 575.7 F g −1 at current density of 0.5 A g −1 .…”

Section: Plant Organ Based Bio-templatesmentioning

confidence: 99%

Bio‐Nanotechnology in High‐Performance Supercapacitors

Zhang

Wang

et al. 2017

Advanced Energy Materials

180

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on seeking suitable electrode materials, and optimizing the electrode/electrolyte and electrode/current collector interface properties. As the core of such energystorage devices, the electrode materials directly determine the processing cost and performance of devices, such as their rate capability, specific capacitance (C sp ), cycling stability, etc, which enable the safe and highly-efficient use of energy. [1a,3] Based on the mechanisms of charge storage, SC electrodes can be classified as electric double layer electrodes (EDLEs), pseudocapacitive electrodes, and hybrid electrodes. Most of the EDLEs use carbon materials (activated carbon (AC), [4] carbon nanotubes (CNTs), [5] carbon nanofibers (CNFs), [6] graphene (GN), [7] etc.) as the electrode active materials and store energy only by electrostatic accumulation at the electrode/electrolyte interface. EDLEs usually show high charge-discharge rates and high cycling stability, while their energy densities (≈5 W h kg −1 ) are often greatly limited by the Brunauer-Emmett-Teller (BET) specific surface area (S BET ) and the pore size distribution of electrode materials. Pseudocapacitive electrodes are generally based on conductive polymers (polypyrrole (PPy), polyaniline (PANI), polythiophene, etc.) [8] and transition metal oxides/ hydroxides (Fe 3 O 4 , MnO 2 , RuO 2 , NiO, Co 3 O 4 , Ni(OH) 2 , etc.), [9] and use reversible faradic processes for energy storage. Compared to EDLEs, pseudocapacitive electrodes can offer much higher storage capabilities because of the faradic reactions involved. In the case of transition metal oxides/hydroxides, however, their poor electrical conductivity generally leads to low power density. In addition, the easily damaged structures of conductive polymers during the faradic processes usually lead to poor cycling stability. To resolve these problems, hybrid electrodes (GN/PPy, CNTs/PPy, GN/MnO 2 , PPy/MnO 2 , NiMoO 4 / PANI, CNTs/MoS 2 , PPy/MoS 2 , etc.) [10] have been developed to take complete advantage of both EDLEs and pseudocapacitive electrodes. For a long time, nanotechnological techniques have been considered as promising approaches to prepare highly efficient SC electrodes. [1b,11] Compared with micro-and submillimeter materials, nanomaterials as active SC electrodes have the following advantages: [12] (1) A high S BET means sufficient electroactive sites and thus high capacity utilization of electrode materials; (2) Intrinsic porous structures and small particle sizes, which contribute to the complete penetration of the electrolyte and reduce the diffusion path of electrolyte ions; (3) Highly ordered hierarchical structures can relieve the stress within the materials and offer stable channels for electron transfer, which can ensure good cycling stability; (4) The The use of bio-nanotechnology for the fabrication of diverse functional nanomaterials with precisely controlled morphologies and microstructures is attracting considerable attention due to its sustainability and renewability. As one of the key energy storag...

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Facile fabrication of well-defined microtubular carbonized kapok fiber/NiO composites as electrode material for supercapacitor

Cited by 59 publications

References 52 publications

Pollen-inspired synthesis of porous and hollow NiO elliptical microstructures assembled from nanosheets for high-performance electrochemical energy storage

Pollen-inspired synthesis of porous and hollow NiO elliptical microstructures assembled from nanosheets for high-performance electrochemical energy storage

Liquid phase synthesis of dendritic nickel carbide alloy with high conductivity for advanced energy storage

Bio‐Nanotechnology in High‐Performance Supercapacitors

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