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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. Source


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. Source


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. Source


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. Source


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. Source

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