Unblocking Ion-occluded Pore Channels in Poly(triazine imide) Framework for Proton Conduction.

Autor: Chi HY; Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l'Industrie 17, 1950, Sion, Switzerland., Chen C; Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia., Zhao K; Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l'Industrie 17, 1950, Sion, Switzerland., Villalobos LF; Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l'Industrie 17, 1950, Sion, Switzerland., Schouwink PA; Institute of Chemical Sciences and Engineering (ISIC), EPFL, Rue de l'Industrie 17, 1950, Sion, Switzerland., Piveteau L; Institute of Chemical Sciences and Engineering, NMR Platform, EPFL, Rte Cantonale, 1015, Lausanne, Switzerland., Marshall KP; Swiss-Norwegian Beamlines, European Synchrotron Radiation Facility, 71 Av. des Martyrs, 38000, Grenoble, France., Liu Q; Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l'Industrie 17, 1950, Sion, Switzerland., Han Y; Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia., Agrawal KV; Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l'Industrie 17, 1950, Sion, Switzerland.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2022 Oct 04; Vol. 61 (40), pp. e202207457. Date of Electronic Publication: 2022 Aug 25.
DOI: 10.1002/anie.202207457
Abstrakt: Poly(triazine imide) or PTI is an ordered graphitic carbon nitride hosting Å-scale pores attractive for selective molecular transport. AA'-stacked PTI layers are synthesized by ionothermal route during which ions occupy the framework and occlude the pores. Synthesis of ion-free PTI hosting AB-stacked layers has been reported, however, pores in this configuration are blocked by the neighboring layer. The unavailability of open pore limits application of PTI in molecular transport. Herein, we demonstrate acid treatment for ion depletion which maintains AA' stacking and results in open pore structure. We provide first direct evidence of ion-depleted open pores by imaging with the atomic resolution using integrated differential phase-contrast scanning transmission electron microscopy. Depending on the extent of ion-exchange, AA' stacking with open channels and AB stacking with closed channels are obtained and imaged for the first time. The accessibility of open channels is demonstrated by enhanced proton transport through ion depleted PTI.
(© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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