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Encapsulating mobile proton carriers into structural defects in coordination polymer crystals; High anhydrous proton conduction and fuel cell application

Inukai, Munehiro*; Horike, Satoshi*; Itakura, Tomoya*; Shinozaki, Ryota*; Ogiwara, Naoki*; Umeyama, Daiki*; Nagarker, S.*; Nishiyama, Yusuke*; Malon, M.*; Hayashi, Akari*; Ohara, Takashi  ; Kiyanagi, Ryoji; Kitagawa, Susumu*

We describe encapsulation of mobile proton carriers into defect sites in non-porous coordination polymers. The proton carriers are encapasulated with high mobility and provide high proton conductivity at 150$$^{circ}$$C under anhydrous condition. The high proton conductivity and non-porous nature allow power generation by fuel cell in which CPs are used as electrolyte. To observe defects and mobile proton carriers, we carried out solid-state NMR, XAFS, XRD, and ICP-AES/EA. On the basis of these analyses, we elucidated that the defect sites provide space for mobile uncoordinated H$$_{3}$$PO$$_{4}$$, H$$_{2}$$PO$$_{4}$$$$^{-}$$, and H$$_{2}$$O. These mobile carriers play a key role to expand proton hopping path and promote the mobility of all protons in coordination frameworks, leading to high proton conductivity and fuel cell power generation.

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Category:Chemistry, Multidisciplinary

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