Dynamics and Proton Conduction of Heterogeneously Confined Imidazole in Porous Coordination Polymers |
| |
Authors: | Linkun Cai Dr. Junsheng Yang Yuyan Lai Yuling Liang Prof. Dr. Rongchun Zhang Prof. Dr. Cheng Gu Prof. Dr. Susumu Kitagawa Prof. Dr. Panchao Yin |
| |
Affiliation: | 1. State Key Laboratory of Luminescent Materials and Devices & South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou, 510640 China;2. Institute for Integrated Cell-Material Sciences, Institute for Advanced Study, Kyoto University, Kyoto, 606-8501 Japan |
| |
Abstract: | The nanoconfinement of proton carrier molecules may contribute to the lowing of their proton dissociation energy. However, the free proton transportation does not occur as easily as in liquid due to the restricted molecular motion from surface attraction. To resolve the puzzle, herein, imidazole is confined in the channels of porous coordination polymers with tunable geometries, and their electric/structural relaxations are quantified. Imidazole confined in a square-shape channels exhibits dynamics heterogeneity of core-shell-cylinder model. The core and shell layer possess faster and slower structural dynamics, respectively, when compared to the bulk imidazole. The dimensions and geometry of the nanochannels play an important role in both the shielding of the blocking effect from attractive surfaces and the frustration filling of the internal proton carrier molecules, ultimately contributing to the fast dynamics and enhanced proton conductivity. |
| |
Keywords: | Dynamics Imidazole Nanoconfinement Porous Coordination Polymers Proton Conduction |
|
|