Hydrogen-rich water for green reduction of graphene oxide suspensions. (4th May 2015)

• Record Type: Journal Article
• Authors: Akhavan, O.; Azimirad, R.; Gholizadeh, H.T.; Ghorbani, F.
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 16(2015)
• Page Start: 5553
• Page End: 5560
• Publication Date: 2015-05-04
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.02.106
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">H<sub>2</sub>-rich water as a green antioxidant was applied for deoxygenation of graphene oxide (GO) suspensions. The ability of H<sub>2</sub>-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 H<sub>2</sub>-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 H<sub>2</sub>-water-reduced GO (rGO) sheets. This also resulted in a better restoration of the graphitic structure of the H<sub>2</sub>-water-rGO, as confirmed by Raman spectroscopy. Although H<sub>2</sub>-rich water exhibited slightly lower deoxygenation efficiency than hydrazine, the absence of any C–N bond on the H<sub>2</sub>-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 × 10<sup>10</sup> to 7.2 × 10<sup>5</sup> Ω/sq) which is comparable with the typical conductivity of hydrazine-rGO sheets (here, with Rs value of ∼4.4 × 10<sup>5</sup> Ω/sq). These results suggest application of H<sub>2</sub>-rich water as an effective substitute for hydrazine in environment-friendly and mass production of rGO sheets.</p> </sec> </abstract>