Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo2O5.5+δ thin films

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

doi:10.1063/1.4937926

Title: Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo₂O_5.5+δ thin films

Abstract

Single-crystalline epitaxial thin films of PrBaCo₂O_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 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.

Authors:

Bao, Shanyong ^[1]; Xu, Xing ^[1]; Enriquez, Erik ^[1]; Mace, Brennan E. ^[1]; Chen, Garry ^[1]; Kelliher, Sean P. ^[1]; Chen, Chonglin ^[1]; Zhang, Yamei ^[2]; Whangbo, Myung -Hwan ^[3]; Dong, Chuang ^[4]; Zhang, Qinyu ^[4]

Univ. of Texas, San Antonio, TX (United States)
Jiangsu Univ. of Science and Technology, Jiangsu (China)
North Carolina State Univ., Raleigh, NC (United States)
Dalian Univ. of Technology, Dalian (China)

Publication Date:: Mon Dec 14 00:00:00 EST 2015

Research Org.:: Univ. of Texas at San Antonio, TX (United States)

Sponsoring Org.:: USDOE Office of Fossil Energy (FE)

OSTI Identifier:: 1468476

Alternate Identifier(s):: OSTI ID: 1229600

Grant/Contract Number:: FE0003780

Resource 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)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    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., 2015. 
Web.  doi:10.1063/1.4937926.

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                    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.  https://doi.org/10.1063/1.4937926

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                    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. Mon .  
"Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo2O5.5+δ thin films".  United States.  https://doi.org/10.1063/1.4937926.  https://www.osti.gov/servlets/purl/1468476.

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@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         = {Mon Dec 14 00:00:00 EST 2015},

  month        = {Mon Dec 14 00:00:00 EST 2015}

}

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Title: Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo2O5.5+δ thin films

Abstract

Citation Formats

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Title: Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo₂O_5.5+δ thin films

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