2021 Fiscal Year Annual Research Report
High-Performance Gas Separation Membranes by Guided-Assembly of Graphene-based Nanocomposites
| Project/Area Number |
19F19367
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KARAHAN HUSEYIN 京都大学, 高等研究院, 外国人特別研究員
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| Project Period (FY) |
2019-11-08 – 2022-03-31
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| Keywords | Stable laminate membrane / Hydrogen selectivity |
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| Outline of Annual Research Achievements |
Our research achievements in this project are threefold. First, we have found that the GO-polycation composites coagulate too fast to give uniform slurries and, thus, defect-free gas separation membranes. At high GO-polycation loadings (high concentrations), we could obtain conformal coatings with rod/blade-coating methods. But the resulting membranes became too thick but were still often defective because of fast aggregation. We could produce smoother coatings using non-polyelectrolytes (such as hydrogen-bondable polymers) but still observed only low hydrogen selectivity. However, when we used positively charged nanoparticles and vacuum filtration, we achieved conformal and defect-free membranes, yielding selectivities up to 150 and permeabilities up to around 4000 GPU. Based on the experiments made with polymer-free nanosheet dispersions, we also found that vacuum filtration can be used for compacting membranes that are prepared by other coating methods such as spray-coating. Overall, this collaborative research resulted in the establishment of four fundamental notions: (1) Electrostatic interactions are highly effective in stabilizing GO-based membranes; (2) guided-assembly methods (such as vacuum-assisted filtration and vacuum-spray-coating) should be optimized for achieving defect-free membranes; (3) composite membranes should be polymer-free or rich in nanosheets for developing defect-free membranes with high hydrogen selectivity.
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| Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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[Journal Article] Overcoming humidity-induced swelling of graphene oxide-based hydrogen membranes using charge-compensating nanodiamonds2021
Author(s)
Guoji Huang, Behnam Ghalei, Ali Pournaghshband Isfahani, H. Enis Karahan, Daiki Terada, Detao Qin, Conger Li, Masahiko Tsujimoto, Daisuke Yamaguchi, Kunihisa Sugimoto, Ryuji Igarashi, Bor Kae Chang, Tao Li, Masahiro Shirakawa & Easan Sivaniah
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Journal Title
Nature Energy
Volume: 6
Pages: 1176,1187
DOI
Peer Reviewed / Int'l Joint Research
