Three-dimensional strutted graphene grown by substrate-free sugar blowing for high-power-density supercapacitors

Wang, Xuebin; Zhang, Yuanjian; Chen, Zhi; Wang, Xi; Tang, Dai‐Ming; Xu, Yibin; Weng, Qunhong; Jiang, Xiangfen; Mitome, Masanori; Golberg, Dmitri; Bando, Yoshio

doi:10.1038/ncomms3905

Cited by 627 publications

(360 citation statements)

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“…18 and Supplementary Table 1. Plotting the relative compressive modulus (E/E s ) of various fabricated FIBER NFAs versus their relative density (r/r s ) revealed that the modulus scaled as E/E s B(r/r s ) 2 (Fig. 3a), indicating a cellulardominated mechanical behaviour similar to that of open-cell cellular foams 10,44 .…”

Section: Resultsmentioning

confidence: 99%

“…U ltra-low density materials are attractive for their wide range of applications in the fields of thermal insulation, catalyst supports, tissue engineering, battery electrodes and acoustic, vibration or shock energy damping [1][2][3][4] . The ultralight regime below 10 mg cm À 3 currently contains very few materials: silica colloid aerogels (41 mg cm À 3 ), carbon nanotube aerogels (40.16 mg cm À 3 ), graphene monoliths (40.5 mg cm À 3 ), aerographite (40.18 mg cm À 3 ), and metal microlattices (40.9 mg cm À 3 ) (refs 5-9).…”

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confidence: 99%

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Ultralight nanofibre-assembled cellular aerogels with superelasticity and multifunctionality

et al. 2014

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Three-dimensional nanofibrous aerogels (NFAs) that are both highly compressible and resilient would have broad technological implications for areas ranging from electrical devices and bioengineering to damping materials; however, creating such NFAs has proven extremely challenging. Here we report a novel strategy to create fibrous, isotropically bonded elastic reconstructed (FIBER) NFAs with a hierarchical cellular structure and superelasticity by combining electrospun nanofibres and the fibrous freeze-shaping technique. Our approach causes the intrinsically lamellar deposited electrospun nanofibres to assemble into elastic bulk aerogels with tunable densities and desirable shapes on a large scale. The resulting FIBER NFAs exhibit densities of 40.12 mg cm À 3 , rapid recovery from deformation, efficient energy absorption and multifunctionality in terms of the combination of thermal insulation, sound absorption, emulsion separation and elasticity-responsive electric conduction. The successful synthesis of such fascinating materials may provide new insights into the design and development of multifunctional NFAs for various applications.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Ultralight nanofibre-assembled cellular aerogels with superelasticity and multifunctionality

et al. 2014

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“…Recently, a number of excellent reviews and reports on the design, preparation, modification, characterization, properties, engineering, and applications of carbon‐based materials for symmetry‐structured EDLCs have been published 78, 79, 80, 81, 82, 83, 84, 85, 86, 87…”

Section: Symmetric Electrodes In Different Energy‐storage Systemsmentioning

confidence: 99%

Symmetric Electrodes for Electrochemical Energy‐Storage Devices

et al. 2016

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Increasing environmental problems and energy challenges have so far attracted urgent demand for developing green and efficient energy‐storage systems. Among various energy‐storage technologies, sodium‐ion batteries (SIBs), electrochemical capacitors (ECs) and especially the already commercialized lithium‐ion batteries (LIBs) are playing very important roles in the portable electronic devices or the next‐generation electric vehicles. Therefore, the research for finding new electrode materials with reduced cost, improved safety, and high‐energy density in these energy storage systems has been an important way to satisfy the ever‐growing demands. Symmetric electrodes have recently become a research focus because they employ the same active materials as both the cathode and anode in the same energy‐storage system, leading to the reduced manufacturing cost and simplified fabrication process. Most importantly, this feature also endows the symmetric energy‐storage system with improved safety, longer lifetime, and ability of charging in both directions. In this Progress Report, we provide the comprehensive summary and comment on different symmetric electrodes and focus on the research about the applications of symmetric electrodes in different energy‐storage systems, such as the above mentioned SIBs, ECs and LIBs. Further considerations on the possibility of mass production have also been presented.

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“…[21] The porosity conotrol of the as-prepared carbon electrode materials is also vital for achieving the high performance for SC. In addition to activation methods, the porous structure of biochar based electrodes can be tuned by the following aspects: (1) specific biomaterials with hierarchical pore structures can be selected as the biomass source; (2) hard template (such as mesoporous silica, metal oxide) can be combined with "additive" methodologies to treat natural biomaterials for carbon materials porosity control; [58] (3) softtemplating approaches [59] or some non-templating methods, [60] such as sugar-blowing technique, [61] spray pyrolysis, [62] can also be used to produce biochars with excellent electrochemical properties. Compared with other processing methods, the relative simple and feasible processing procedures as well as low cost raw materials are advantageous for bio-nanotechnological fabrication to be used in the manufacturing.…”

Section: Carbonization Technology For Biomassmentioning

confidence: 99%

Bio‐Nanotechnology in High‐Performance Supercapacitors

Zhang

Wang

et al. 2017

Advanced Energy Materials

172

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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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Three-dimensional strutted graphene grown by substrate-free sugar blowing for high-power-density supercapacitors

Cited by 627 publications

References 65 publications

Ultralight nanofibre-assembled cellular aerogels with superelasticity and multifunctionality

Ultralight nanofibre-assembled cellular aerogels with superelasticity and multifunctionality

Symmetric Electrodes for Electrochemical Energy‐Storage Devices

Bio‐Nanotechnology in High‐Performance Supercapacitors

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