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Cluster-associated filling of water molecules in graphene-based mesopores

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Abstract

Graphene monoliths were prepared through unidirectional freeze-drying method of graphene oxide colloids-KOH mixed solution and successive reduction by heating at 573 K in Ar. The porosity- and crystallinity-controlled graphene monoliths were prepared by the KOH activation at different temperature and the post-heating in Ar. These activated graphene monoliths were characterized by N2 adsorption at 77 K, X-ray diffraction and Raman spectroscopy. Water adsorption isotherms show a typical hydrophobicity below P/P 0 = 0.5 and a marked hydrophilicity above P/P 0 = 0.6, which depends on the pore width. In the water adsorption isotherms of porous graphene monoliths activated at different temperature, the higher the activation temperature, the larger the rising P/P 0. No essential change in the shape of the water adsorption isotherm for the post-heated nanoporous graphene monoliths is observed except for the decrease in water adsorption amount with higher post-heating temperature. The linear relationship between the saturated water adsorption and pore volume whose width is smaller than 4 nm indicates clearly that water molecules are adsorbed in small mesopores by the cluster-associated filling mechanism.

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Acknowledgments

The authors are thankful to Concert-Japan: Efficient Energy Storage and Distribution, JST, and partial supports by the Grant-in-Aid for Scientific Research (A) (24241038) and the Center of innovation Program from Japan Science and Technology Agency, JST.

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Authors and Affiliations

  1. Center for Energy and Environmental Science, Shinshu University, Wakasato, Nagano, 380-8553, Japan

    S. Wang, R. Futamura & K. Kaneko

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  1. S. Wang
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  2. R. Futamura
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  3. K. Kaneko
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Correspondence to K. Kaneko.

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Wang, S., Futamura, R. & Kaneko, K. Cluster-associated filling of water molecules in graphene-based mesopores. Adsorption 22, 1035–1042 (2016). https://doi.org/10.1007/s10450-016-9797-6

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