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      Facet-Dependent Cuprous Oxide Nanocrystals Decorated with Graphene as Durable Photocatalysts under Visible Light

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      Nanomaterials

      MDPI

      Cu2O, crystal facets, graphene sheets, photocatalytic degradation, durability

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          Abstract

          Three morphologies (octahedral, hierarchical and rhombic dodecahedral) of crystal Cu 2O with different facets ({111}, {111}/{110}, and {110}) incorporating graphene sheets (denoted as o-Cu 2O-G, h-Cu 2O-G and r-Cu 2O-G, respectively) have been fabricated by using simple solution-phase techniques. Among these photocatalysts, the r-Cu 2O-G possesses the best photocatalytic performance of 98% removal efficiency of methyl orange (MO) with outstanding kinetics for 120 min of visible light irradiation. This enhancement is mainly due to the dangling “Cu” atoms in the highly active {110} facets, resulting in the increased adsorption of negatively charged MO. More importantly, the unique interfacial structures of Cu 2O rhombic dodecahedra connected to graphene nanosheets can not only decrease the recombination of electron-hole pairs but also stabilize the crystal structure of Cu 2O, as verified by a series of spectroscopic analyses (e.g., X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM)). The effective photocatalysts developed in this work could be applied to the efficient decolorization of negatively charged organic dyes by employing solar energy.

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          Most cited references 52

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          Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide

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            Graphene-based ultracapacitors.

            The surface area of a single graphene sheet is 2630 m(2)/g, substantially higher than values derived from BET surface area measurements of activated carbons used in current electrochemical double layer capacitors. Our group has pioneered a new carbon material that we call chemically modified graphene (CMG). CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here we demonstrate in an ultracapacitor cell their performance. Specific capacitances of 135 and 99 F/g in aqueous and organic electrolytes, respectively, have been measured. In addition, high electrical conductivity gives these materials consistently good performance over a wide range of voltage scan rates. These encouraging results illustrate the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.
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              Micrometer-scale ballistic transport in encapsulated graphene at room temperature

              Devices made from graphene encapsulated in hexagonal boron-nitride exhibit pronounced negative bend resistance and an anomalous Hall effect, which are a direct consequence of room-temperature ballistic transport on a micrometer scale for a wide range of carrier concentrations. The encapsulation makes graphene practically insusceptible to the ambient atmosphere and, simultaneously, allows the use of boron nitride as an ultrathin top gate dielectric.
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                Author and article information

                Journal
                Nanomaterials (Basel)
                Nanomaterials (Basel)
                nanomaterials
                Nanomaterials
                MDPI
                2079-4991
                11 June 2018
                June 2018
                : 8
                : 6
                Affiliations
                Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan; dalelu4404@ 123456gmail.com
                Author notes
                [* ]Correspondence: shliu@ 123456mail.ncku.edu.tw ; Tel.: +886-6-275-7575 (ext. 65843)
                nanomaterials-08-00423
                10.3390/nano8060423
                6027350
                29891796
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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