Environmentally Benign Metal-Free Reduction of GO
Using Molecular Hydrogen: A Mechanistic Insight
Posted on 2018-11-08 - 14:58
A simple
yet effective methodology to obtain high-quality reduced
graphene oxide (RGO) using a tetrahydrofuran suspension of GO under
hydrogen at moderate pressure has been demonstrated. The extent of
reduction as a function of the pressure of hydrogen gas, temperature,
and time was studied, where the abstraction of oxygen is achievable
with least mutilation of C-sp2 bonds, hence upholding the
integrity of the graphene sheet. Herein, the formation of a short-lived
species is proposed, which is possibly responsible for such reduction.
A detailed theoretical calculation along with in situ UV–visible
experiments reveals the existence of a transient solvated electron
species in the reaction medium. The hydrogen RGO (HRGO) achieved a
C/O atomic ratio of 11.3. The conductivity measurements show that
HRGO reached as high as 934 S/m, which indicates a high quality of
RGO. The process is hassle-free, environmentally benign, and can be
scaled up effortlessly without compromising the quality of the material.
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Rai, Ritu; Ahmed, Zubair; Kumar, Rajinder; Kumawat, Rameshwar L.; Chordiya, Kalyani; Maruyama, Takahiro; et al. (2018). Environmentally Benign Metal-Free Reduction of GO
Using Molecular Hydrogen: A Mechanistic Insight. ACS Publications. Collection. https://doi.org/10.1021/acsomega.8b00848