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      Dimensionally integrated nanoarchitectonics for a novel composite from 0D, 1D, and 2D nanomaterials: RGO/CNT/CeO2 ternary nanocomposites with electrochemical performance

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          Abstract

          Dimensionally mixed ternary nanocomposite RGO/CNT/CeO 2 develops novel functions displaying enhanced electrochemical performance.

          Abstract

          We report a one-step conversion of a dimensionally mixed ternary nanocomposite from zero-dimensional (0D) cerium oxide (CeO 2), one-dimensional (1D) carbon nanotubes (CNTs), and two-dimensional (2D) reduced graphene oxide (RGO) nanomaterials by the chemical precipitation method. The RGO/CNT/CeO 2 ternary nanocomposite showed excellent electrochemical performance (electrical double layer capacitor properties) in an aqueous electrolyte followed by long term cyclic stability and high energy density compared to its binary counterparts.

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          Graphene oxide--MnO2 nanocomposites for supercapacitors.

          Sheng Chia Chen, Junwu Zhu, Xiaodong Wu … (2010)
          A composite of graphene oxide supported by needle-like MnO(2) nanocrystals (GO-MnO(2) nanocomposites) has been fabricated through a simple soft chemical route in a water-isopropyl alcohol system. The formation mechanism of these intriguing nanocomposites investigated by transmission electron microscopy and Raman and ultraviolet-visible absorption spectroscopy is proposed as intercalation and adsorption of manganese ions onto the GO sheets, followed by the nucleation and growth of the crystal species in a double solvent system via dissolution-crystallization and oriented attachment mechanisms, which in turn results in the exfoliation of GO sheets. Interestingly, it was found that the electrochemical performance of as-prepared nanocomposites could be enhanced by the chemical interaction between GO and MnO(2). This method provides a facile and straightforward approach to deposit MnO(2) nanoparticles onto the graphene oxide sheets (single layer of graphite oxide) and may be readily extended to the preparation of other classes of hybrids based on GO sheets for technological applications.
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            Electrochemistry of graphene and related materials.

            Adriano Ambrosi, Chun Chua, Alessandra Bonanni … (2014)
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              Three-dimensional Pt-on-Pd bimetallic nanodendrites supported on graphene nanosheet: facile synthesis and used as an advanced nanoelectrocatalyst for methanol oxidation.

              Shaojun Guo, Shaojun Dong, Erkang Wang (2010)
              Graphene nanosheet, the hottest material in physics and materials science, has been studied extensively because of its unique electronic, thermal, mechanical, and chemical properties arising from its strictly 2D structure and because of its potential technical applications. Particularly, these remarkable characteristics enable it to be a promising candidate as a new 2D support to load metal nanoparticles (NPs) for application in fuel cells. However, constructing high-quality graphene/bimetallic NP hybrids with high electrochemical surface area (ECSA) remains a great challenge to date. In this paper, we demonstrate for the first time a wet-chemical approach for the synthesis of high-quality three-dimensional (3D) Pt-on-Pd bimetallic nanodendrites supported on graphene nanosheets (TP-BNGN), which represents a new type of graphene/metal heterostructure. The resulting hybrids were characterized by atomic force microscopy (AFM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), Raman spectroscopy, and electrochemical technique. It is found that small single-crystal Pt nanobranches supported on Pd NCs with porous structure and good dispersion were directly grown onto the surface of graphene nanosheets, which exhibits high electrochemical active area. Furthermore, the number of nanobranches for Pt-on-Pd bimetallic nanodendrites on the surface of graphene nanosheets could be easily controlled via simply changing the synthetic parameters, thus resulting in the tunable catalytic properties. Most importantly, the electrochemical data indicate that the as-prepared graphene/bimetallic nanodendrite hybrids exhibited much higher electrocatalytic activity toward methanol oxidation reaction than the platinum black (PB) and commercial E-TEK Pt/C catalysts.
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                Author and article information

                Journal
                Journal ID (publisher-id): JMCAET
                Title: J. Mater. Chem. A
                Abbreviated Title: J. Mater. Chem. A
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 2050-7488
                ISSN (Electronic): 2050-7496
                Publication date Created: 2014
                Publication date (Print): 2014
                Volume: 2
                Issue: 43
                Pages: 18480-18487
                Article
                DOI: 10.1039/C4TA03996C
                SO-VID: fca5cd9f-a6a9-468c-baf0-dad6bb867aaa
                Copyright © © 2014
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