1H NMR study of the hydrogen dynamics in the (NaS)xGe(OH)4-x*y H2O ceramic proton conductors
Artikel i vetenskaplig tidskrift, 2012

1H NMR was performed on the ceramic proton conductor (NaS)xGe(OH)4-x*y H2O for x=2,3 and y≈1-4 over the temperature range of −100 °C to 400 °C. NMR spectra, nuclear spin-lattice relaxation rates (R1), spin-spin relaxation rates (R2), and rotating frame relaxation rates (R1ρ) were obtained for both hydrated and dehydrated samples. It was found that the low temperature NMR spectra were consistent with simulated H2O lineshapes, and the presence of H3O+ at low temperature was not detected within the experimental uncertainty. Short- and long-range hydrogen motion occurred together, a signature of Grotthuss conduction mechanisms. The long range motion was a combination of H+ and H2O diffusion, with H2O motion limiting H+ dynamics as the onset temperature was approached.

Grotthuss

Water

Dynamics

Conductor

NMR

Proton

Författare

Ananda Shastri

Minnesota State University Moorhead

David Shane

Washington University in St. Louis

Jonas Nordström

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Aleksandar Matic

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Steve Martin

Iowa State University

Solid State Ionics

0167-2738 (ISSN)

Vol. 228 46-55

Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialkemi

Den kondenserade materiens fysik

Styrkeområden

Materialvetenskap

DOI

10.1016/j.ssi.2012.09.017