TUNING GRAPHENE MULTI-STEP THERMAL REDUCTION PROCESS

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TUNING GRAPHENE MULTI-STEP THERMAL REDUCTION PROCESS ( tuning-graphene-multi-step-thermal-reduction-process )

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To summarized, it has been demonstrated that by means of the multi-step procedure developed in this study it is possible to prepare graphene materials with a suitable C/O ratio (depending on the final temperature selected), an increased BET surface area (compared to that of the material prepared by the single-step ramp- heated material) and easily conformable into stable electrodes for electrochemical energy storage devices. ACKNOWLEDGMENT: The authors thank REPSOL for their financial support. Dr. P. Alvarez also acknowledges MICINN for her Ramon y Cajal contract. Work patented (ref: EP14382352.4) REFERENCES 1 Ruoff RS, Bielawski CW, Dreyer DR. From Conception to Realization: An Historial Account of Graphene and Some Perspectives for Its Future. Angew. Chem. Int. Ed. 2010; 49: 9336-9345. 2 Dreyer DR, Park S, Bielawski CW, Ruoff RS. Chem. Soc. Rev. 2010;39: 228-40. 3 Acik M, Chabal Y J.. A Review on Thermal Exfoliation of Graphene Oxide. Journal of Materials Science Research 2013; 2:1: 101-12. 4 Agharkara M, Kochrekara S, Hidouria S, Azeez MA. Trends in green reduction of graphene oxides, issues and challenges: A review. Materials Research Bulletin 2014; 59: 323–328 5 McAllister MJ, Li JL, Adamson DH, Schniepp HC, Abdala AA, Liu J, et al., Single Sheet Functionalized Graphene by Oxidation and Thermal Expansion of Graphite Chem Mater 2007; 19: 4396-404 6 Potts JR, Shankar O, Murali S, Du L, Ruoff RS. Latex and two-roll mill processing of thermally-exfoliated graphite oxide/natural rubber nanocomposites. Compos Sci Technol 2013;74:166–72. 7 Botas C, Alvarez P, Blanco C, Santamaría R, Granda M, Gutierrez MD. et al., Critical temperatures in the synthesis of graphene- like materials by thermal exfoliation–reduction of graphite oxide. Carbon, 2013; 52: 476-85. 8 Schniepp HC, Li JL, McAllister MJ, Sai H, Herrera-Alonso M, Adamson DH, et al. Functionalized Single Graphene Sheets Derived from Splitting Graphite Oxide. Phys Chem C 2006; 110: 8535-9 9 Zhang Y, Li D, Tan X, Zhang B, Ruan X, Liu H et al. High quality graphene sheets from graphene oxide by hot-pressing. Carbon 2013; 54: 143-8. 10 González Z, Botas C, Blanco C, Santamaría R, Granda M, Álvarez P. et al. Thermally reduced graphite and graphene oxides in VRFBs. Nano Energy 2013; 2: 1322–8. 11 Botas C, Álvarez P, Blanco C, Santamaría R, Granda M, Ares P, et al. The effect of the parent graphite on the structure of graphene oxide. Carbon 2012; 50: 275–82 6

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