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Hydrophilic vs Hydrophobic: Exploring Facet-Dependent Proton Transport Channels in Single Crystal of Ring-Shaped Trimeric Isopolytungstate
- Source :
- Chemistry of Materials; 20240101, Issue: Preprints
- Publication Year :
- 2024
-
Abstract
- Research on the facet-dependent anisotropic proton conduction of single crystals is advantageous to visualize the molecular level mechanism of polyoxometalate (POM)-based crystalline proton-conducting materials. Herein, we constructed a novel ring-shaped trimeric isopolytungstate {(RuW11O37)O}318–(1a) with an inner hydrophobic space and an outer hydrophilic surface. After assembly through the hydrated cation linkers, polyanion 1arings formed the single-crystal Rb11Na6H·1a·36H2O (1) with (01̅0), (101), and (1̅11) faces, which have different sizes and types (hydrophilic-Grotthuss-type and/or hydrophobic-Vehicle-type) of proton transport channels. Accordingly, proton conductivity (σ) of single-crystal 1can reach 3.84 × 10–2S cm–1along the direction perpendicular to the (01̅0) face at 358 K under 85% relative humidity (RH), which is equivalent to that of crystal pellet (2.09 × 10–2S cm–1) and accompanied by the ratio of σ(01̅0):σ(101):σ(1̅11)= 121:5:1. It reveals a visible (01̅0) facet-dependent proton-conducting pathway in the large-sized hydrophilic pore channels through a water-induced hydrogen bond network under the Grotthuss hopping mechanism.
Details
- Language :
- English
- ISSN :
- 08974756
- Issue :
- Preprints
- Database :
- Supplemental Index
- Journal :
- Chemistry of Materials
- Publication Type :
- Periodical
- Accession number :
- ejs67333525
- Full Text :
- https://doi.org/10.1021/acs.chemmater.4c01818