Abstract
The development of anhydrous proton-conductive materials operating at temperatures above 80 ∘C is a challenge that needs to be met for practical applications. Herein, we propose the new idea of encapsulation of a proton-carrier molecule—imidazole in this work—in aluminium porous coordination polymers for the creation of a hybridized proton conductor under anhydrous conditions. Tuning of the host–guest interaction can generate a good proton-conducting path at temperatures above 100 ∘C. The dynamics of the adsorbed imidazole strongly affect the conductivity determined by 2H solid-state NMR. Isotope measurements of conductivity using imidazole-d4 showed that the proton-hopping mechanism was dominant for the conducting path. This work suggests that the combination of guest molecules and a variety of microporous frameworks would afford highly mobile proton carriers in solids and gives an idea for designing a new type of proton conductor, particularly for high-temperature and anhydrous conditions.
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Acknowledgements
This work was supported by Japan Science and Technology Agency (JST).
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S.B. and M.H. prepared the aluminium PCPs. S.B. and T.K. measured the ionic conductivity. S.B., N.Y. and D.T. carried out solid-state NMR work and their data analysis was carried out by S.B. and M.M. The work was directed by S.K., and S.B. and S.H. contributed in writing the manuscript.
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Bureekaew, S., Horike, S., Higuchi, M. et al. One-dimensional imidazole aggregate in aluminium porous coordination polymers with high proton conductivity. Nature Mater 8, 831–836 (2009). https://doi.org/10.1038/nmat2526
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DOI: https://doi.org/10.1038/nmat2526
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