2013 Fiscal Year Final Research Report
Development of novel hydroxide ion conductors using post synthetic method
| Project/Area Number |
24850013
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Inorganic chemistry
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| Research Institution | Kyushu University |
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Principal Investigator |
SADAKIYO Masaaki 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教 (40635885)
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| Project Period (FY) |
2012-08-31 – 2014-03-31
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| Keywords | イオン伝導体 / 配位高分子 |
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| Research Abstract |
We demonstrate a metal-organic framework (MOF) design for the inclusion of hydroxide ions. Salt inclusion method was applied to an alkaline-stable ZIF-8 (ZIF: zeolitic imidazolate framework) to introduce alkylammonium hydroxides as ionic carriers. We found that tetrabutylammonium salts are immobilized inside the pores by a hydrophobic interaction between the alkyl groups of the salt and the framework, which significantly increases the hydrophilicity of the ZIF-8. Furthermore, the ZIF-8 including the salt exhibited a capacity for OH- ion exchange, implying that freely exchangeable OH- ions are present in the MOF. The ZIF-8 containing OH- ions showed an ionic conductivity of 2.3 x 10-8 S cm-1 at 25 C, which is four orders of magnitude higher than that of the blank ZIF-8. This is the first example of an MOF-based hydroxide ion conductor.
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