Local structure of hydrated nanocrystalline films of the proton conductor BaZr1-xScxO3-x/2 studied by infrared spectroscopy
Artikel i vetenskaplig tidskrift, 2024

We report results from a study of the local structure of hydrated nanocrystalline 2 μm films of the well known proton conductor BaZr1-xScxO3-x/2 with x = 0.45, 0.54 and 0.64, using infrared (IR) spectroscopy. The films were prepared by magnetron sputtering. Analysis of the IR spectra focused on the O–H stretching region (2000—3700 cm-1), which reveals the presence of several distinct O–H stretching bands for which the intensity and frequency of each band vary in an unsystematic manner with Sc concentration. The spectra for the two higher Sc concentrations, x = 0.54 and 0.64, exhibit a distinct, highly intense O–H stretching band centered at around 3400–3500 cm-1, which is assigned to relatively symmetric, weakly hydrogen-bonding, proton configurations. The spectrum for the lower Sc concentration, x = 0.45, does not feature such a band but a broader, weaker, O–H stretching band between approximately 2500 and 3700 cm-1, suggesting that the protons are more homogeneously distributed over a range of different local proton coordinations in this relatively weakly doped material. A comparison to the IR spectra of powder samples of similar compositions suggests that for x = 0.45, the spectra and proton coordination of films and powder samples are similar, whereas for x = 0.54 and 0.64, a larger fraction of protons seems to be located in weakly hydrogen-bonding proton configurations in the films compared to the respective powder samples.

Infrared spectroscopy

Films

Fuel cell

O-H stretch vibration

Proton conducting oxide

Författare

Elena Naumovska

Chalmers, Kemi och kemiteknik, Energi och material

Gabriel Kofi Nzulu

Linköpings universitet

Laura Mazzei

Chalmers, Kemi och kemiteknik, Energi och material

Arnaud le Febvrier

Linköpings universitet

Kristina Komander

Uppsala universitet

Martin Magnuson

Linköpings universitet

Max Wolff

Uppsala universitet

Per Eklund

Linköpings universitet

Maths Karlsson

Chalmers, Kemi och kemiteknik, Energi och material

Vibrational Spectroscopy

0924-2031 (ISSN)

Vol. 130 103622

Tidsupplöst spektroskopi på proton- och hydridjon-ledande perovskiter

Energimyndigheten (48712-1), 2020-01-01 -- 2024-12-31.

Ämneskategorier

Kemi

Styrkeområden

Materialvetenskap

DOI

10.1016/j.vibspec.2023.103622

Mer information

Senast uppdaterat

2024-07-09