Key Laboratory of Cluster Science

Beijing, China

Key Laboratory of Cluster Science

Beijing, China

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Meng Y.,Key Laboratory of Cluster Science | Zhao Y.,Key Laboratory of Cluster Science | Hu C.,Key Laboratory of Cluster Science | Cheng H.,Key Laboratory of Cluster Science | And 4 more authors.
Advanced Materials | Year: 2013

Unique all-graphene core-sheath fibers composed of a graphene fiber core with a sheath of 3D graphene network have been developed. Used as flexible electrodes, all-solid-state fiber supercapacitors have been fabricated, which can be managed to highly compressible and stretchable spring supercapacitors and can also be woven into a textile for wearable electronics. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Dong Z.,Key Laboratory of Cluster Science | Jiang C.,Key Laboratory of Cluster Science | Cheng H.,Key Laboratory of Cluster Science | Zhao Y.,Key Laboratory of Cluster Science | And 3 more authors.
Advanced Materials | Year: 2012

Macroscopic graphene fibers with strength comparable to carbon nanotube yarns have been fabricated with a facile dimensionally-confined hydrothermal strategy from low-cost, aqueous graphite oxide suspensions, which is shapable, weavable, and has a density of less than 1/7 conventional carbon fibers. In combination with the easy in situ and post-synthesis functionalization, the highly flexible graphene fibers can be woven into smart textiles. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Li Y.,Key Laboratory of Cluster Science | Zhao Y.,Key Laboratory of Cluster Science | Cheng H.,Key Laboratory of Cluster Science | Hu Y.,Key Laboratory of Cluster Science | And 3 more authors.
Journal of the American Chemical Society | Year: 2012

Graphene quantum dots (GQDs) represent a new class of quantum dots with unique properties. Doping GQDs with heteroatoms provides an attractive means of effectively tuning their intrinsic properties and exploiting new phenomena for advanced device applications. Herein we report a simple electrochemical approach to luminescent and electrocatalytically active nitrogen-doped GQDs (N-GQDs) with oxygen-rich functional groups. Unlike their N-free counterparts, the newly produced N-GQDs with a N/C atomic ratio of ca. 4.3% emit blue luminescence and possess an electrocatalytic activity comparable to that of a commercially available Pt/C catalyst for the oxygen reduction reaction (ORR) in an alkaline medium. In addition to their use as metal-free ORR catalysts in fuel cells, the superior luminescence characteristic of N-GQDs allows them to be used for biomedical imaging and other optoelectronic applications. © 2011 American Chemical Society.


Cheng H.,Key Laboratory of Cluster Science | Zhao Y.,Key Laboratory of Cluster Science | Fan Y.,Key Laboratory of Cluster Science | Xie X.,Key Laboratory of Cluster Science | And 2 more authors.
ACS Nano | Year: 2012

Graphene quantum dots (GQDs), single or few-layer graphenes with a size of only several nanometers, are a new type of quantum dots (QDs) with unique properties. The assembly of QDs in a geometrically well-defined fashion opens up opportunities to obtain access to the full potential of assembled QDs by virtue of the collective properties of the ensembles. In the current study, we present the well-organized assembly of zero-dimensional (0D) functional GQDs into 1D nanotube (NT) arrays and demonstrate their remarkable potential as a new metal-free platform for efficient surface-enhanced Raman scattering (SERS) applications. The hierarchically porous 1D nanotube structure of 0D GQDs has been prepared by electrophoresis deposition within a nanoporous AAO template. On the basis of the unique porous nanotube architecture of GQDs, the GQD-NTs could ensure a more efficient charge transfer between the target molecules and the GQDs and thus produce much stronger SERS effect, exceeding that on flat graphene sheets. The unique architecture of 1D nanotubes of 0D GQDs provides a new point of view for designing and fabricating SERS substrates. © 2012 American Chemical Society.


Li Q.,Key Laboratory of Cluster Science | Blancafort L.,Institute Of Quimica Computacional I Catalisi
Chemical Communications | Year: 2013

A conical intersection seam is behind the restriction of intramolecular rotation mechanism for aggregation induced emission in diphenyl dibenzofulvene (DPDBF). In solution, the seam is accessed through rotation around the exocyclic fulvene bond, leading to radiationless decay to the ground state. In the solid, the seam cannot be accessed because the torsion is blocked, and DPDBF becomes emissive. © 2013 The Royal Society of Chemistry.


Hu C.,Key Laboratory of Cluster Science | Cheng H.,Key Laboratory of Cluster Science | Zhao Y.,Key Laboratory of Cluster Science | Hu Y.,Key Laboratory of Cluster Science | And 3 more authors.
Advanced Materials | Year: 2012

Newly-designed ternary Pt/PdCu nanoboxes on three-dimensional graphene framework (Pt/PdCu/3DGF) have been fabricated via a dual solvothermal strategy. This structurally well-defined Pt/PdCu/3DGF system possesses an approximately 4-fold improvement in catalytic activity for ethanol oxidation in alkaline media over the commercial 20% Pt/C catalyst as normalized by the total mass of active metals, showing the great potential for direct fuel cell applications. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Hu C.,Key Laboratory of Cluster Science | Song L.,Key Laboratory of Cluster Science | Zhang Z.,Key Laboratory of Cluster Science | Chen N.,Key Laboratory of Cluster Science | And 2 more authors.
Energy and Environmental Science | Year: 2015

Graphene-based materials have shown great potential in various fields across physics, chemistry, biology, and electronics, due to their unique electronic properties, facile synthesis, and ease of functionalization. In this review, we summarize the significant advances in tailored graphene systems for the recently developed unconventional energy conversion and storage devices reported by our group and others, namely focused on their tunable and controllable preparation and remarkable applications in new types of supercapacitors, lithium ion batteries, photovoltaic cells, and other emerging generators. This featured article also highlights the working principles and outlines the problems hindering the practical applications of graphene-based materials in these energy-related devices. Future research trends towards new methodologies in the design and synthesis of graphene-based systems with unique properties for emerging energy storage and energy conversion devices are also proposed. © 2015 The Royal Society of Chemistry.


Cheng H.,Key Laboratory of Cluster Science | Hu C.,Key Laboratory of Cluster Science | Zhao Y.,Key Laboratory of Cluster Science | Qu L.,Key Laboratory of Cluster Science
NPG Asia Materials | Year: 2014

Graphene fiber (GF) is of practical importance because it integrates the remarkable properties of individual graphene sheets into useful, macroscopic ensembles that possess the common characteristics of fibers, such as mechanical flexibility for textiles, while maintaining the unique advantages over conventional carbon fibers, such as low cost, light weight, shapeability and ease of functionalization in an in situ or post-synthetic manner for various applications. In this review, we judiciously summarize the significant advances in GFs achieved by our group and others in recent years, including the tunable and controllable preparation of GFs with functionality and their remarkable applications for unconventional devices, such as flexible fiber-type actuators, robots, motors, photovoltaic cells and supercapacitors. © 2014 Nature Publishing Group All rights reserved.


Zhao Y.,Key Laboratory of Cluster Science | Song L.,Key Laboratory of Cluster Science | Zhang Z.,Key Laboratory of Cluster Science | Qu L.,Key Laboratory of Cluster Science
Energy and Environmental Science | Year: 2013

The rise of graphene has triggered the fast increasing research upsurge in both controllable synthesis of graphene and unique applications associated with its miraculous properties. In particular, graphene-based smart devices that can automatically respond to external stimulations are among those attracting our most attention. In this featured article, we summarize some of the recent advances in stimulus-responsive graphene actuation systems contributed by us and others, and discuss the different roles that graphene plays in various actuation circumstances such as under electrical, chemical, photonic, thermal and other stimuli. Impressive progress including graphene-based robots is also presented, demonstrating the great prospects of graphene actuation systems in a wide range of applications including sensors, switches, artificial muscles, nano/micro electromechanical devices, etc. © 2013 The Royal Society of Chemistry.


Zhang J.,Key Laboratory of Cluster Science | Zhao F.,Key Laboratory of Cluster Science | Zhang Z.,Key Laboratory of Cluster Science | Chen N.,Key Laboratory of Cluster Science | Qu L.,Key Laboratory of Cluster Science
Nanoscale | Year: 2013

Functional graphene nanostructures of interesting physical and chemical properties have been attracting lots of research effort. In this feature article we focus on some of the recent work of dimension-tailed graphene contributed by us and others, and review the current trends in the tunable and controllable preparation of functionalized graphene architectures ranging from zero-dimensional quantum dots to three-dimensional networks. Additionally, recent progresses in applying these dimension-tailored graphene structures in energy conversion and storage are explicitly discussed, particularly in devices such as solar cells, actuators, fuel cells, supercapacitors, etc., presenting the great prospect of functional graphene structures in this dynamic research field. © The Royal Society of Chemistry 2013.

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