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  Studying Proton Mobility in Zeolites by Varying Temperature Infrared Spectroscopy

Losch, P., Joshi, H. R., Stegmann, N., Vozniuk, O., & Schmidt, W. (2019). Studying Proton Mobility in Zeolites by Varying Temperature Infrared Spectroscopy. Molecules, 24(17): 3199. doi:10.3390/molecules24173199.

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 Creators:
Losch, Pit1, Author              
Joshi, Hrishikesh R.2, Author              
Stegmann, Niklas1, Author              
Vozniuk, Olena2, Author              
Schmidt, Wolfgang1, Author              
Affiliations:
1Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445618              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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Free keywords: pProton-conducting materials; VTIR; acidic materials; zeolites
 Abstract: We report a varying temperature infrared spectroscopic (VTIR) study with partial deuterium isotopic exchange as a method for characterizing proton mobility in acidic materials. This VTIR technique permits the estimation of activation energies for proton diffusion. Different acidic materials comprising classical proton-conducting materials, such as transition metal phosphates and sulfonated solids, as well as different zeolites, are tested with this new method. The applicability of the method is thus extended to a vast library of materials. Its underlying principles and assumptions are clearly presented herein. Depending on the temperature ranges, different activation energies for proton transfer are observed irrespective of the different materials. In addition to the well-studied transition metal phosphates, Si-rich zeolites appear to be promising proton-transfer materials (with Eact < 40 kJ mol−1) for application in high-temperature (>150 °C) PEM fuel cells. They significantly outperform Nafion and sulfonated silica, which exhibit higher activation energies with Eact ~ 50 and 120 kJ mol−1, respectively.

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Language(s): eng - English
 Dates: 2019-08-132019-08-292019-09-03
 Publication Status: Published online
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3390/molecules24173199
 Degree: -

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Title: Molecules
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: - Volume / Issue: 24 (17) Sequence Number: 3199 Start / End Page: - Identifier: ISSN: 1420-3049
CoNE: https://pure.mpg.de/cone/journals/resource/954925623244