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Title: Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo 2O 5.5+δ thin films

Single-crystalline epitaxial thin films of PrBaCo 2O 5.5+δ (PrBCO) were prepared, and their resistance R(t) under a switching flow of oxidizing and reducing gases were measured as a function of the gas flow time t in the temperature range of 200–800 °C. During the oxidation cycle under O 2, the PrBCO films exhibit fast oscillations in their dR(t)/dt vs. t plots, which reflect the oxidation processes, Co 2+/Co 3+ → Co 3+ and Co 3+ → Co 3+/Co 4+, that the Co atoms of PrBCO undergo. Each oscillation consists of two peaks, with larger and smaller peaks representing the oxygen/hydrogen diffusion through the (BaO)(CoO 2)(PrO)(CoO 2) layers of PrBCO via the oxygen-vacancy-exchange mechanism. Furthermore, this finding paves a significant avenue for cathode materials operating in low-temperature solid-oxide-fuel-cell devices and for chemical sensors with wide range of operating temperature.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4]
  1. Univ. of Texas, San Antonio, TX (United States)
  2. Jiangsu Univ. of Science and Technology, Jiangsu (China)
  3. North Carolina State Univ., Raleigh, NC (United States)
  4. Dalian Univ. of Technology, Dalian (China)
Publication Date:
Grant/Contract Number:
FE0003780
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 24; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Texas, San Antonio, TX (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1468476
Alternate Identifier(s):
OSTI ID: 1229600

Bao, Shanyong, Xu, Xing, Enriquez, Erik, Mace, Brennan E., Chen, Garry, Kelliher, Sean P., Chen, Chonglin, Zhang, Yamei, Whangbo, Myung -Hwan, Dong, Chuang, and Zhang, Qinyu. Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo2O5.5+δ thin films. United States: N. p., Web. doi:10.1063/1.4937926.
Bao, Shanyong, Xu, Xing, Enriquez, Erik, Mace, Brennan E., Chen, Garry, Kelliher, Sean P., Chen, Chonglin, Zhang, Yamei, Whangbo, Myung -Hwan, Dong, Chuang, & Zhang, Qinyu. Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo2O5.5+δ thin films. United States. doi:10.1063/1.4937926.
Bao, Shanyong, Xu, Xing, Enriquez, Erik, Mace, Brennan E., Chen, Garry, Kelliher, Sean P., Chen, Chonglin, Zhang, Yamei, Whangbo, Myung -Hwan, Dong, Chuang, and Zhang, Qinyu. 2015. "Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo2O5.5+δ thin films". United States. doi:10.1063/1.4937926. https://www.osti.gov/servlets/purl/1468476.
@article{osti_1468476,
title = {Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo2O5.5+δ thin films},
author = {Bao, Shanyong and Xu, Xing and Enriquez, Erik and Mace, Brennan E. and Chen, Garry and Kelliher, Sean P. and Chen, Chonglin and Zhang, Yamei and Whangbo, Myung -Hwan and Dong, Chuang and Zhang, Qinyu},
abstractNote = {Single-crystalline epitaxial thin films of PrBaCo2O5.5+δ (PrBCO) were prepared, and their resistance R(t) under a switching flow of oxidizing and reducing gases were measured as a function of the gas flow time t in the temperature range of 200–800 °C. During the oxidation cycle under O2, the PrBCO films exhibit fast oscillations in their dR(t)/dt vs. t plots, which reflect the oxidation processes, Co2+/Co3+ → Co3+ and Co3+ → Co3+/Co4+, that the Co atoms of PrBCO undergo. Each oscillation consists of two peaks, with larger and smaller peaks representing the oxygen/hydrogen diffusion through the (BaO)(CoO2)(PrO)(CoO2) layers of PrBCO via the oxygen-vacancy-exchange mechanism. Furthermore, this finding paves a significant avenue for cathode materials operating in low-temperature solid-oxide-fuel-cell devices and for chemical sensors with wide range of operating temperature.},
doi = {10.1063/1.4937926},
journal = {Applied Physics Letters},
number = 24,
volume = 107,
place = {United States},
year = {2015},
month = {12}
}