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Title: Structure and Dynamics Investigations of Sr/Ca-Doped LaPO 4 Proton Conductors

Proton conductors loom out of the pool of candidate materials with great potential to boost hydrogen alternatives to fossil-based resources for energy. Acceptor-doped lanthanum orthophosphates are considered for solid oxide fuel cells (SOFCs) for their potential stability and conductivity at high temperature. By exploring the crystal and defect structure of x% Sr/Ca-doped LaPO4 with different nominal Sr/Ca concentrations (x = 0–10) with neutron powder diffraction (NPD) and X-ray powder diffraction (XRD), we confirm that Sr/Ca-doped LaPO4 can exist as self-supported structures at high temperatures during solid oxide fuel cell operation. Thermal stability, surface topography, and size distribution are also studied to better understand the proton conductivity for dry and wet compounds obtained at sintering temperatures ranging from 1200 to 1400 °C using a combination of scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), and electrochemical impedance spectroscopy (EIS). The results confirm that Sr-doped samples exhibit the highest proton conductivity of our samples and illustrate the impact of material design and versatile characterization schemes on the development of proton conductors with superior functionality.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ; ;  [4] ;  [4] ; ; ORCiD logo ; ORCiD logo ;
  1. University of Missouri Research Reactor, University of Missouri—Columbia, Columbia, Missouri 65211, United States
  2. Department of Physics and Astronomy, University of Washington, Seattle, Washington 98105, United States
  3. NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
  4. Department of Chemistry and Biochemistry, Lamar University, Beaumont, Texas 77710, United States
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 121; Journal Issue: 22; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
OSTI Identifier:
1476434

al-Wahish, Amal, al-Binni, U., Tetard, L., Bridges, C. A., Kharel, Krishna, Günaydın-Şen, Özge, Huq, A., Musfeldt, J. L., Paranthaman, M. P., and Mandrus, D.. Structure and Dynamics Investigations of Sr/Ca-Doped LaPO 4 Proton Conductors. United States: N. p., Web. doi:10.1021/acs.jpcc.7b02254.
al-Wahish, Amal, al-Binni, U., Tetard, L., Bridges, C. A., Kharel, Krishna, Günaydın-Şen, Özge, Huq, A., Musfeldt, J. L., Paranthaman, M. P., & Mandrus, D.. Structure and Dynamics Investigations of Sr/Ca-Doped LaPO 4 Proton Conductors. United States. doi:10.1021/acs.jpcc.7b02254.
al-Wahish, Amal, al-Binni, U., Tetard, L., Bridges, C. A., Kharel, Krishna, Günaydın-Şen, Özge, Huq, A., Musfeldt, J. L., Paranthaman, M. P., and Mandrus, D.. 2017. "Structure and Dynamics Investigations of Sr/Ca-Doped LaPO 4 Proton Conductors". United States. doi:10.1021/acs.jpcc.7b02254. https://www.osti.gov/servlets/purl/1476434.
@article{osti_1476434,
title = {Structure and Dynamics Investigations of Sr/Ca-Doped LaPO 4 Proton Conductors},
author = {al-Wahish, Amal and al-Binni, U. and Tetard, L. and Bridges, C. A. and Kharel, Krishna and Günaydın-Şen, Özge and Huq, A. and Musfeldt, J. L. and Paranthaman, M. P. and Mandrus, D.},
abstractNote = {Proton conductors loom out of the pool of candidate materials with great potential to boost hydrogen alternatives to fossil-based resources for energy. Acceptor-doped lanthanum orthophosphates are considered for solid oxide fuel cells (SOFCs) for their potential stability and conductivity at high temperature. By exploring the crystal and defect structure of x% Sr/Ca-doped LaPO4 with different nominal Sr/Ca concentrations (x = 0–10) with neutron powder diffraction (NPD) and X-ray powder diffraction (XRD), we confirm that Sr/Ca-doped LaPO4 can exist as self-supported structures at high temperatures during solid oxide fuel cell operation. Thermal stability, surface topography, and size distribution are also studied to better understand the proton conductivity for dry and wet compounds obtained at sintering temperatures ranging from 1200 to 1400 °C using a combination of scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), and electrochemical impedance spectroscopy (EIS). The results confirm that Sr-doped samples exhibit the highest proton conductivity of our samples and illustrate the impact of material design and versatile characterization schemes on the development of proton conductors with superior functionality.},
doi = {10.1021/acs.jpcc.7b02254},
journal = {Journal of Physical Chemistry. C},
number = 22,
volume = 121,
place = {United States},
year = {2017},
month = {5}
}