Capacitive carbons are attractive for energy storage on account of their superior rate and cycling performance over traditional battery materials, but they usually suffer from a far lower volumetric energy density. Starting with expanded graphene, a simple, multifunctional molten sodium amide treatment for the preparation of high‐density graphene with high
Metal oxide nanoparticles deposited on the surface of GO sheets have been used as nanocatalysts to promote the etching reaction of graphitic C. Kim and co-authors 73 reported a scalable fabrication of microscaled HG with a high density of nanoholes via the catalytic C gasification (Figure 3 B). First, SnO 2 nanoparticles were uniformly grown on the
Downloadable! Supercapacitors represent an important strategy for electrochemical energy storage, but are usually limited by relatively low energy density. Here we report a three-dimensional holey graphene framework with a hierarchical porous structure as a high-performance binder-free supercapacitor electrode. With large ion-accessible surface area,
Supercapacitors represent an important strategy for electrochemical energy storage, but are usually limited by relatively low energy density. Here we report a three-dimensional holey graphene framework with a hierarchical porous structure as a high-performance binder-free supercapacitor electrode. With large ion-accessible surface area, efficient electron and ion
Holey graphene frameworks (HGFs) that are compressed under 150 MPa possess high SSA and interlinked ion-transport channels. Therefore, Holey graphene frameworks for highly efficient capacitive energy storage. Nat. Commun., 5 (2014), p. 4554. View in Scopus Google Scholar [25]
Metal—organic frameworks (MOFs) with redox-active metal sites and controllable crystalline structures make it possible to access the merits of highly-efficient electrode materials in electrochemical energy storage systems. However, most MOFs suffer from low capacitance and poor cycling stability that largely thwart their application. Herein, we present
In particular, the nanopores in holey graphene sheets are large enough to function as the ion diffusion shortcuts between different layers of graphene to greatly speed up the ion transport across the entire film and facilitate ion access to the entire surface area (Fig. 1f), which is not possible with non-holey GFs (Fig. 1e).
Holey graphene frameworks for highly efficient capacitive energy storage. Nat. Commun. 5, 4554 (2014). Article Google Scholar Xu, Y. et al. Solution processable holey graphene oxide and its
With large ion-accessible surface area, efficient electron and ion transport pathways as well as a high packing density, the holey graphene framework elec-trode can deliver a gravimetric capacitance of 298 Fg 1 and a volumetric capacitance of 212 Fcm 3 in organic electrolyte.
The initial solvated 3D hierarchical porous structure of holey graphene framework. Credit: UCLA CNSI. Scientists at UCLA have developed a new graphene material that bridges gap between traditional capacitors and batteries, boosting the energy density of electrochemical capacitors and putting them on a par with lead acid batteries.. Researchers at
By creating a highly compact graphene film using vacuum filtration and capillary compression, a recent study has reported a greatly improved volumetric capacitance exceeding 200 F cm −3, yet with a modest gravimetric capacitance of 167 F g −1 (ref. 16).
Xu Y. et al. Holey graphene frameworks for highly efficient capacitive energy storage. Nat. Commun. 5, 4554 (2014). [Google Scholar] Ren L. et al. 3D hierarchical porous graphene aerogel with tunable meso-pores on graphene nanosheets for high-performance energy storage. Sci. Rep. 5, 14229 (2015). [PMC free article] [Google Scholar]
Holey graphene frameworks for highly efficient capacitive energy storage. Y. Xu, Z. Lin, X. Zhong, X. Huang, N. O. Weiss, Y. Huang and X. Duan. the holey graphene framework electrode can deliver a gravimetric capacitance of 298 F g−1 and a volumetric capacitance of 212 F cm−3 in organic electrolyte. Furthermore, we show that a fully
Supercapacitors represent an important strategy for electrochemical energy storage, but are usually limited by relatively low energy density. Here we report a three-dimensional holey graphene framework with a hierarchical porous structure as a high-performance binder-free supercapacitor electrode. With large ion-accessible surface area,
Holey graphene frameworks for highly efficient capacitive energy storage. Yuxi Xu, Zhaoyang Lin, Xing Zhong, Xiaoqing Huang, Nathan O. Weiss, Yu Huang and Xiangfeng Duan () Additional contact information the holey graphene framework electrode can deliver a gravimetric capacitance of 298 F g−1 and a volumetric capacitance of 212 F cm−3
This paper studies holey graphene with various neck widths (the smallest distance between two neighbor holes). For the considered structures, the energy gap, the Fermi level, the density of electronic states, and the distribution of the local density of electronic states (LDOS) were found. The electroconductive properties of holey graphene with round holes
An exceptionally high CO2 over N2 selectivity can be achieved under conditions relevant to capture from the dry exhaust gas stream of a coal burning power plant, suggesting the possibility of recovering highly pure CO2 for long-term sequestration and/or utilization for downstream applications. Atmospheric CO2 concentrations continue to rise rapidly in
Nitrogen-enriched graphene framework from a large-scale magnesiothermic and holey graphene) 3,45,46 Y. X. et al. Holey graphene frameworks for highly efficient capacitive energy storage.
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Holey graphene frameworks for highly efficient capacitive energy storage. Yuxi Xu Zhaoyang Lin +4 authors X. Duan. Materials Science, Engineering TLDR. A three-dimensional holey graphene framework with a hierarchical porous structure as a high-performance binder-free supercapacitor electrode that can deliver gravimetric and volumetric
(DOI: 10.1038/NCOMMS5554) Carbon-based materials are promising supercapacitor electrodes, but suffer from limited energy densities. Here, the authors report a holey graphene framework with hierarchical porous structures and fully accessible surface areas, leading to high energy densities comparable to lead-acid batteries.
Capacitive deionization is an attractive approach to water desalination and treatment. To achieve efficient capacitative desalination, rationally designed electrodes with high specific capacitances, conductivities, and stabilities are necessary. Here we report the construction of a three-dimensional (3D) holey graphene hydrogel (HGH). This material
For instance, a holey graphene framework was developed through H 2 O 2 etching, Xu, Y. et al. Holey graphene frameworks for highly efficient capacitive energy storage. Nat.
With large ion-accessible surface area, efficient electron and ion transport pathways as well as a high packing density, the holey graphene framework electrode can deliver a gravimetric capacitance of more »... 298 F g À 1 and a volumetric capacitance of 212 F cm À 3 in organic electrolyte. Furthermore, we show that a fully packaged device
Zhonghui Chen, Xuhui An, Liming Dai*, Yuxi Xu*, "Holey Graphene-based Nanocomposites for Efficient Electrochemical Energy Storage", Nano Energy 2020, 73, 104762. 26. Minmin Fan, Dankui Liao, Mohamed F. Aly Aboud, Imran Shakir, Yuxi Xu*, "A Universal Strategy toward Ultrasmall Hollow Nanostructures with Remarkable Electrochemical
Holey graphene frameworks for highly efficient capacitive energy storage the holey graphene framework electrode can deliver a gravimetric capacitance of 298Fg(-1) and a volumetric capacitance of 212Fcm(-3) in organic electrolyte. Furthermore, we show that a fully packaged device stack can deliver gravimetric and volumetric energy densities
Supercapacitors have shown extraordinary promise for miniaturized electronics and electric vehicles, but are usually limited by electrodes with rather low volumetric performance, which is largely due to the inefficient utilization of pores in charge storage. Herein, we design a freestanding graphene laminate film electrode with highly efficient pore utilization for compact
A simple strategy is developed to prepare a flexible and free‐standing modified MXene/holey graphene film by filtration of the alkalized MXene and holey graphene oxide dispersions, followed by a mild annealing treatment, which opens a new avenue for the further exploration of MXene materials in energy storage devices.
As the photovoltaic (PV) industry continues to evolve, advancements in holey graphene frameworks for highly efficient capacitive energy storage have become critical to optimizing the utilization of renewable energy sources. From innovative battery technologies to intelligent energy management systems, these solutions are transforming the way we store and distribute solar-generated electricity.
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