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Vu T.H.T.,Key Laboratory for Petrochemical and Refinery Technologies | Tran T.T.T.,Key Laboratory for Petrochemical and Refinery Technologies | Le H.N.T.,Key Laboratory for Petrochemical and Refinery Technologies | Nguyen P.H.T.,Key Laboratory for Petrochemical and Refinery Technologies | And 2 more authors.
Bulletin of Materials Science | Year: 2015

A simple and green chemistry approach for the preparation of reduced graphene oxide nanosheets was successfully demonstrated through the reduction of graphene oxide (GO) using caffeine as the reductant. Without using toxic and harmful chemicals, this method is environmentally friendly and suitable for the large-scale production of graphene. The samples of GO, before and after reduction with caffeine have been characterized by X-ray diffraction, Raman, Fourier transform infrared, X-ray photoelectron spectroscopy, thermogravimetric analysis and transmission electron microscopy. © Indian Academy of Sciences.


Vu T.H.T.,Key Laboratory for Petrochemical and Refinery Technologies | Tran T.T.T.,Key Laboratory for Petrochemical and Refinery Technologies | Le H.N.T.,Key Laboratory for Petrochemical and Refinery Technologies | Tran L.T.,Key Laboratory for Petrochemical and Refinery Technologies | And 3 more authors.
Electrochimica Acta | Year: 2015

In this work, Pt-SiO2/graphene nanocomposites have been synthesized under solvothermal conditions and investigated as electrocatalysts for methanol oxidation. Structure and morphology of these catalysts are characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and nitrogen adsorption/desorption studies. The Pt and SiO2 contents of these nanocomposites are determined by inductively coupled plasma optical emission spectrometry (ICP-OES). Their electrocatalytic properties are investigated by cyclic voltammetry, chronoamperometry, chronopotentiometry and electrochemical impendence spectroscopy. The as-prepared nanocomposites show the improved catalytic performance, better stability and good antiposoining ability compared with Pt supported on graphene catalyst. Particularly, the catalyst containing 9.24% of SiO2 exhibits the best electrocatalytic performance for methanol oxidation with mass activity of 1047 mA mg-1. © 2015 Elsevier Ltd. All rights reserved.


Thi Tran T.T.,Key Laboratory for Petrochemical and Refinery Technologies | Thi Le H.N.,Key Laboratory for Petrochemical and Refinery Technologies | Van Tran H.,Key Laboratory for Petrochemical and Refinery Technologies | Thi Tran L.,Key Laboratory for Petrochemical and Refinery Technologies | Thi Vu T.H.,Key Laboratory for Petrochemical and Refinery Technologies
Materials Letters | Year: 2016

Reduced graphene oxide was one-pot synthesized from graphene oxide using pectin from Tithonia diversifolia as a reducing and stabilizing agent. The success of the process was confirmed by UV–vis, FT-IR, XRD spectroscopy. The TEM and AFM images showed the structure of few-layer graphene nanosheets with the dimension of hundreds nm and the thickness about 2.5 nm. The cytotoxic tests revealed that the reduction process of graphene oxide using pectin led to a lower cytotoxicity. © 2016 Elsevier B.V.


Thi Vu T.H.,Key Laboratory for Petrochemical and Refinery Technologies | Thi Tran T.T.,Key Laboratory for Petrochemical and Refinery Technologies | Thi Le H.N.,Key Laboratory for Petrochemical and Refinery Technologies | Tran L.T.,Key Laboratory for Petrochemical and Refinery Technologies | And 2 more authors.
Journal of Power Sources | Year: 2014

Hybrid materials comprising of Pt dispersed on AlOOH, SiO2 doped graphene are successfully synthesized. The structure and morphology of the catalysts are characterized by X-ray diffraction, TEM, HRTEM and X-ray photoelectron spectroscopy. Their electrocatalytic properties are investigated by cyclic voltammetry, chronoamperometry and chronopotentiometry. The experimental results show that the presence of AlOOH and SiO2 favors the Pt nanoparticles dispersion on the graphene sheets. This greatly improves the electrocatalytic activities of Pt/graphene catalysts for methanol oxidation. In particular, the catalyst containing 7% of Al and Si exhibits the best electrocatalytic performance for methanol oxidation with mass activity of 1720 mA mg-1. Therefore, Pt-AlOOH-SiO2/graphene hybrid is shown to be an effective catalyst for fuel cell application. © 2014 Elsevier B.V. All rights reserved.

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