Hydrogen-rich water for green reduction of graphene oxide suspensions

Akhavan, O ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2015.02.106
  3. Publisher: Elsevier Ltd , 2015
  4. Abstract:
  5. Abstract H2-rich water as a green antioxidant was applied for deoxygenation of graphene oxide (GO) suspensions. The ability of H2-rich water for deoxygenation of GO sheets was found comparable to the ability of hydrazine (as a standard and powerful reductant), using X-ray photoelectron spectroscopy. In fact, the O/C ratio of GO sheets could be reduced from 0.51 to 0.21 and 0.16 by H2-rich water and hydrazine, respectively. More importantly, while C-N bond formation is one of the side effects of GO reduction by hydrazine, no chemical C-N bond was found on the H2-water-reduced GO (rGO) sheets. This also resulted in a better restoration of the graphitic structure of the H2-water-rGO, as confirmed by Raman spectroscopy. Although H2-rich water exhibited slightly lower deoxygenation efficiency than hydrazine, the absence of any C-N bond on the H2-water-rGO resulted in an excellent electrical conductivity (corresponding to the sharp reduction in the electrical sheet resistance (Rs) of the GO sheets from ∼6.3 × 1010 to 7.2 × 105 Ω/sq) which is comparable with the typical conductivity of hydrazine-rGO sheets (here, with Rs value of ∼4.4 × 105 Ω/sq). These results suggest application of H2-rich water as an effective substitute for hydrazine in environment-friendly and mass production of rGO sheets. Copyright
  6. Keywords:
  7. Electrical property ; Graphene oxide ; Hydrogen-rich water ; XPS ; Chemical bonds ; Electric properties ; Graphene ; Hydrazine ; Reduction ; C-n bond formations ; Deoxygenations ; Electrical conductivity ; Electrical sheet resistance ; Environment friendly ; Graphene oxides ; Graphitic structures ; Mass production ; X ray photoelectron spectroscopy
  8. Source: International Journal of Hydrogen Energy ; Volume 40, Issue 16 , 2015 , Pages 5553-5560 ; 03603199 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0360319915005078