Temperature-Dependent Infrared Spectroscopy of Proton-Conducting Hydrated Perovskite BaInxZr1-xO3-x/2 (x=0.10-0.75)
(2010) In Journal of Physical Chemistry C 114(13). p.6177-6181- Abstract
- We investigate the temperature dependence of the O-H stretch band in the infrared absorbance spectra of the proton-conducting hydrated perovskites BaInxZr1-xO3-x/2 (x = 0.10-0.75) over the temperature range -160 to 350 degrees C. Upon increasing temperature from -160 to 30 degrees C, we show that there is a redistribution of protons from nonsymmetrical structural configurations, such as Zr-OH-In and Zr-OH-Zr-vacancy, where the degree of hydrogen bonding between the protons and neighboring oxygens is strong, to symmetrical configurations, such as Zr-OH-Zr and In-OH-In, where hydrogen bonding is weaker. Spectra measured at elevated temperatures, 30-350 degrees C, indicate preferential desorption of protons in sites where the degree of... (More)
- We investigate the temperature dependence of the O-H stretch band in the infrared absorbance spectra of the proton-conducting hydrated perovskites BaInxZr1-xO3-x/2 (x = 0.10-0.75) over the temperature range -160 to 350 degrees C. Upon increasing temperature from -160 to 30 degrees C, we show that there is a redistribution of protons from nonsymmetrical structural configurations, such as Zr-OH-In and Zr-OH-Zr-vacancy, where the degree of hydrogen bonding between the protons and neighboring oxygens is strong, to symmetrical configurations, such as Zr-OH-Zr and In-OH-In, where hydrogen bonding is weaker. Spectra measured at elevated temperatures, 30-350 degrees C, indicate preferential desorption of protons in sites where the degree of hydrogen bonding is strong, and show that the materials gradually dehydrate with increasing temperature. The dehydration rate is found to be highest in the temperature range 275-325 degrees C. Furthermore, the spectroscopic results indicate that strong hydrogen bonding, caused by dopant-induced short-range structural distortions, is favorable for high proton mobility and that the rate-limiting step in the conduction mechanism is the proton transfer between neighboring oxygens. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1587031
- author
- Karlsson, Maths LU ; Matic, Aleksandar ; Zanghellini, Ezio and Ahmed, Istaq
- organization
- publishing date
- 2010
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physical Chemistry C
- volume
- 114
- issue
- 13
- pages
- 6177 - 6181
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000276096200061
- scopus:77950592860
- ISSN
- 1932-7447
- DOI
- 10.1021/jp910307u
- language
- English
- LU publication?
- yes
- id
- e99d9c81-7b2a-4b11-ab9c-f4f2ce7caca9 (old id 1587031)
- date added to LUP
- 2016-04-01 09:52:34
- date last changed
- 2022-01-25 17:30:23
@article{e99d9c81-7b2a-4b11-ab9c-f4f2ce7caca9,
abstract = {{We investigate the temperature dependence of the O-H stretch band in the infrared absorbance spectra of the proton-conducting hydrated perovskites BaInxZr1-xO3-x/2 (x = 0.10-0.75) over the temperature range -160 to 350 degrees C. Upon increasing temperature from -160 to 30 degrees C, we show that there is a redistribution of protons from nonsymmetrical structural configurations, such as Zr-OH-In and Zr-OH-Zr-vacancy, where the degree of hydrogen bonding between the protons and neighboring oxygens is strong, to symmetrical configurations, such as Zr-OH-Zr and In-OH-In, where hydrogen bonding is weaker. Spectra measured at elevated temperatures, 30-350 degrees C, indicate preferential desorption of protons in sites where the degree of hydrogen bonding is strong, and show that the materials gradually dehydrate with increasing temperature. The dehydration rate is found to be highest in the temperature range 275-325 degrees C. Furthermore, the spectroscopic results indicate that strong hydrogen bonding, caused by dopant-induced short-range structural distortions, is favorable for high proton mobility and that the rate-limiting step in the conduction mechanism is the proton transfer between neighboring oxygens.}},
author = {{Karlsson, Maths and Matic, Aleksandar and Zanghellini, Ezio and Ahmed, Istaq}},
issn = {{1932-7447}},
language = {{eng}},
number = {{13}},
pages = {{6177--6181}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Journal of Physical Chemistry C}},
title = {{Temperature-Dependent Infrared Spectroscopy of Proton-Conducting Hydrated Perovskite BaInxZr1-xO3-x/2 (x=0.10-0.75)}},
url = {{http://dx.doi.org/10.1021/jp910307u}},
doi = {{10.1021/jp910307u}},
volume = {{114}},
year = {{2010}},
}