Conductive resilient graphene aerogel via magnesiothermic reduction of graphene oxide assemblies
),
Guangming Wu1(
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Graphene aerogels are desirable for energy storage and conversion, as catalysis supports, and as adsorbents for environmental remediation. To produce graphene aerogels with low density, while maintaining high electrical conductivity and strong mechanic performance, we synthesized graphene aerogels by the magnesiothermic reduction of a freeze-dried graphene oxide (GO) self-assembly and subsequent etching of the formed MgO in acid solution. The reduced graphene oxide (rGO) aerogel samples exhibited densities as low as 1.1 mg·cm-3. The rGO aerogel was very resilient, exhibiting full recoveryeven after being compressed by strains of up to 80%; its elastic modulus (E) scaled with density (ρ) as E~ρ2. The rGO aerogels also exhibited high conductivities (e.g., 27.7 S·m-1 at 3.6 mg·cm-3) and outperformed many rGO aerogels fabricated by other reduction processes. Such outstanding properties were ascribed to the microstructures inherited from the freeze-dried GO self-assembly and the magnesiothermic reduction process.
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Conductive resilient graphene aerogel via magnesiothermic reduction of graphene oxide assemblies
), Guangming Wu1(
)
Abstract
Graphene aerogels are desirable for energy storage and conversion, as catalysis supports, and as adsorbents for environmental remediation. To produce graphene aerogels with low density, while maintaining high electrical conductivity and strong mechanic performance, we synthesized graphene aerogels by the magnesiothermic reduction of a freeze-dried graphene oxide (GO) self-assembly and subsequent etching of the formed MgO in acid solution. The reduced graphene oxide (rGO) aerogel samples exhibited densities as low as 1.1 mg·cm-3. The rGO aerogel was very resilient, exhibiting full recoveryeven after being compressed by strains of up to 80%; its elastic modulus (E) scaled with density (ρ) as E~ρ2. The rGO aerogels also exhibited high conductivities (e.g., 27.7 S·m-1 at 3.6 mg·cm-3) and outperformed many rGO aerogels fabricated by other reduction processes. Such outstanding properties were ascribed to the microstructures inherited from the freeze-dried GO self-assembly and the magnesiothermic reduction process.
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Acknowledgements
This work was supported by the Scientific Research Foundation for Returned Scholars, the Ministry of Education of China, Key Basic Research Projects of Science and Technology Commission of Shanghai (No.11JC1412900), and the National Science Foundation of China program (Nos. 21271140, 51472182).
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