The Influence of Local Distortions on Proton Mobility in Acceptor Doped Perovskites
Abstract
Optimizing proton conduction in solids remains the most promising solution for achieving intermediate temperature (~750–1000 K) solid oxide fuel cell devices, and enabling selective membranes for H2 separation. Proton conduction, a thermally activated process, exhibits its highest rates in yttrium (Y) acceptor doped BaZrO3 at an optimal doping level of 20% Y. The presence of extended defects such as grain boundaries has typically generated a wide variability in reported conductivity values. This has hindered a fundamental mechanistic understanding of how (acceptor) doping levels correlate with the activation energy of protons to produce an optimal doping level for fast proton transport. While isolated dopants have been suggested as the primary source of proton trapping, our results indicate that it is the local dopant-density that matters. Here in this work, we show that increasing the local dopant density promotes localized lattice distortions in the presence of point defects such as oxygen-vacancies or proton interstitials. An increasing distortion amplitude traps the point defects more strongly in the form of polarons, forming defect-clusters at higher concentrations. This leads to a monotonic increase in the activation energy (and hence a decrease in proton mobility) as observed in our measurements. The optimum doping level can nowmore »
- Authors:
-
- Georgia Inst. of Technology, Atlanta, GA (United States). Department of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Material Science and Technology Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Science
- Georgia Inst. of Technology, Atlanta, GA (United States). Department of Materials Science and Engineering and The George Woodruff School of Mechanical Engineering
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1470906
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemistry of Materials
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 15; Journal ID: ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Ding, Jilai, Balachandran, Janakiraman, Sang, Xiahan, Guo, Wei, Anchell, Jonathan S., Veith, Gabriel M., Bridges, Craig A., Cheng, Yongqiang, Rouleau, Christopher M., Poplawsky, Jonathan D., Bassiri-Gharb, Nazanin, Unocic, Raymond R., and Ganesh, P. The Influence of Local Distortions on Proton Mobility in Acceptor Doped Perovskites. United States: N. p., 2018.
Web. doi:10.1021/acs.chemmater.8b00502.
Ding, Jilai, Balachandran, Janakiraman, Sang, Xiahan, Guo, Wei, Anchell, Jonathan S., Veith, Gabriel M., Bridges, Craig A., Cheng, Yongqiang, Rouleau, Christopher M., Poplawsky, Jonathan D., Bassiri-Gharb, Nazanin, Unocic, Raymond R., & Ganesh, P. The Influence of Local Distortions on Proton Mobility in Acceptor Doped Perovskites. United States. https://doi.org/10.1021/acs.chemmater.8b00502
Ding, Jilai, Balachandran, Janakiraman, Sang, Xiahan, Guo, Wei, Anchell, Jonathan S., Veith, Gabriel M., Bridges, Craig A., Cheng, Yongqiang, Rouleau, Christopher M., Poplawsky, Jonathan D., Bassiri-Gharb, Nazanin, Unocic, Raymond R., and Ganesh, P. Wed .
"The Influence of Local Distortions on Proton Mobility in Acceptor Doped Perovskites". United States. https://doi.org/10.1021/acs.chemmater.8b00502. https://www.osti.gov/servlets/purl/1470906.
@article{osti_1470906,
title = {The Influence of Local Distortions on Proton Mobility in Acceptor Doped Perovskites},
author = {Ding, Jilai and Balachandran, Janakiraman and Sang, Xiahan and Guo, Wei and Anchell, Jonathan S. and Veith, Gabriel M. and Bridges, Craig A. and Cheng, Yongqiang and Rouleau, Christopher M. and Poplawsky, Jonathan D. and Bassiri-Gharb, Nazanin and Unocic, Raymond R. and Ganesh, P.},
abstractNote = {Optimizing proton conduction in solids remains the most promising solution for achieving intermediate temperature (~750–1000 K) solid oxide fuel cell devices, and enabling selective membranes for H2 separation. Proton conduction, a thermally activated process, exhibits its highest rates in yttrium (Y) acceptor doped BaZrO3 at an optimal doping level of 20% Y. The presence of extended defects such as grain boundaries has typically generated a wide variability in reported conductivity values. This has hindered a fundamental mechanistic understanding of how (acceptor) doping levels correlate with the activation energy of protons to produce an optimal doping level for fast proton transport. While isolated dopants have been suggested as the primary source of proton trapping, our results indicate that it is the local dopant-density that matters. Here in this work, we show that increasing the local dopant density promotes localized lattice distortions in the presence of point defects such as oxygen-vacancies or proton interstitials. An increasing distortion amplitude traps the point defects more strongly in the form of polarons, forming defect-clusters at higher concentrations. This leads to a monotonic increase in the activation energy (and hence a decrease in proton mobility) as observed in our measurements. The optimum doping level can now be explained as a competition between increasing proton concentration with doping levels and increasing activation energy due to defect-clusters formed by defect-polarons. Based on our findings, we demonstrate how to improve proton conductivity in doped BaZrO3, by inhibiting this dopant-lattice polaronic interaction. Finally, this approach should be generally applicable for ionic conduction in perovskite oxides such as oxygen-ion conduction in solid-oxide fuel cells and alkali-ion conduction in solid-state batteries where carriers might get trapped as defect-polarons.},
doi = {10.1021/acs.chemmater.8b00502},
journal = {Chemistry of Materials},
number = 15,
volume = 30,
place = {United States},
year = {Wed Jun 27 00:00:00 EDT 2018},
month = {Wed Jun 27 00:00:00 EDT 2018}
}
Web of Science
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