The Combination of 2D Layered Graphene Oxide and 3D Porous Cellulose Heterogeneous Membranes for Nanofluidic Osmotic Power Generation |
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| Authors: | Pan Jia Xinyi Du Ruiqi Chen Jinming Zhou Marco Agostini Jinhua Sun Linhong Xiao |
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| Institution: | 1.Hebei Key Laboratory of Inorganic Nanomaterials, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China; (P.J.); (X.D.); (J.Z.);2.Materials and Manufacture, Department of Industrial and Materials Science, Chalmers University of Technology, 41296 Göteborg, Sweden; (R.C.); (J.S.);3.Department of Physics, Chalmers University of Technology, 41296 Göteborg, Sweden;4.Department of Organismal Biology, Uppsala University, 75236 Uppsala, Sweden |
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| Abstract: | Salinity gradient energy, as a type of blue energy, is a promising sustainable energy source. Its energy conversion efficiency is significantly determined by the selective membranes. Recently, nanofluidic membrane made by two-dimensional (2D) nanomaterials (e.g., graphene) with densely packed nanochannels has been considered as a high-efficient membrane in the osmotic power generation research field. Herein, the graphene oxide-cellulose acetate (GO–CA) heterogeneous membrane was assembled by combining a porous CA membrane and a layered GO membrane; the combination of 2D nanochannels and 3D porous structures make it show high surface-charge-governed property and excellent ion transport stability, resulting in an efficient osmotic power harvesting. A power density of about 0.13 W/m2 is achieved for the sea–river mimicking system and up to 0.55 W/m2 at a 500-fold salinity gradient. With different functions, the CA and GO membranes served as ion storage layer and ion selection layer, respectively. The GO–CA heterogeneous membrane open a promising avenue for fabrication of porous and layered platform for wide potential applications, such as sustainable power generation, water purification, and seawater desalination. |
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| Keywords: | 2D nanofluidics graphene oxide reversed electrodialysis ion transport osmotic power energy generation |
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