Tuning the Co/Fe ratio in BaCoxFe0.8–xZr0.1Y0.1O3–δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance

Shin, Yewon; Kim, You-dong; Sanders, Michael; Harvey, Steven P.; Walker, Michael; O'Hayre, Ryan

doi:10.1039/d2ta03150g

Title: Tuning the Co/Fe ratio in BaCo_xFe_0.8–xZr_0.1Y_0.1O_3–δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance

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Abstract

The triple conducting oxide BaCo_0.4Fe_0.4Zr_0.1Y0.1O_3–δ (BCFZY4411), which accommodates simultaneous transport of protons, oxygen ions, and p-type electronic carriers, has been intensively investigated in recent years as a high-performance positive electrode material for fuel cell and electrolysis applications. The heavy Co and Fe-based transition metal doping in BCFZY4411 ensures adequate electrical conductivity while the multiple oxidation states of Co and Fe assist the electrocatalytic and redox ability. Despite the considerable role of Co and Fe transition metal doping in controlling electrochemical activity, however, the study of alternative BCFZY compositions with varying Co/Fe ratios has not yet been pursued. Here, we evaluate the electrochemical performance of a series of BaCo_xFe_0.8–xZr_0.1Y0.1O_3–δ compositions with varying Co/Fe ratio (x = 0.1, 0.2, 0.4, 0.6, 0.7) and use oxygen ion tracer diffusion and in situ high-temperature X-ray diffraction to investigate the effect of Co/Fe ratio on electrocatalytic activity, electronic conductivity, oxygen ion incorporation and transport kinetics, and thermomechanical behavior. We find that Co-rich BCFZY7111 yields the highest performance due to exceptionally high oxygen vacancy diffusion and shows a lower and more linear thermal expansion behavior compared to Fe-rich compositions. A protonic ceramic button cell incorporating a BCFZY7111 positive electrode yields a peak power density of 695more »« less

Authors:

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Colorado School of Mines, Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

Publication Date:: Fri Nov 11 00:00:00 EST 2022

Research Org.:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Org.:: USDOD; US Army Research Office (ARO); National Science Foundation (NSF); CoorsTek, Inc.

OSTI Identifier:: 1906318

Report Number(s):: NREL/JA-5K00-84495
Journal ID: ISSN 2050-7488; MainId:85268;UUID:e7facb52-f3ac-47b3-affc-e7d39d5e219e;MainAdminID:68276

Grant/Contract Number:: AC36-08GO28308; W911NF-17-1-0051; 1726898

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Materials Chemistry. A

Additional Journal Information:: Journal Volume: 10; Journal Issue: 46; Journal ID: ISSN 2050-7488

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

Subject:: 30 DIRECT ENERGY CONVERSION; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; conducting oxides; electrolysis; electronic carriers; fuel cell performance; proton conductors

Citation Formats


                    Shin, Yewon, Kim, You-dong, Sanders, Michael, Harvey, Steven P., Walker, Michael, and O'Hayre, Ryan. Tuning the Co/Fe ratio in BaCoxFe0.8–xZr0.1Y0.1O3–δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance.  United States: N. p., 2022. 
Web.  doi:10.1039/d2ta03150g.

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                    Shin, Yewon, Kim, You-dong, Sanders, Michael, Harvey, Steven P., Walker, Michael, & O'Hayre, Ryan. Tuning the Co/Fe ratio in BaCoxFe0.8–xZr0.1Y0.1O3–δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance.  United States.  https://doi.org/10.1039/d2ta03150g

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                    Shin, Yewon, Kim, You-dong, Sanders, Michael, Harvey, Steven P., Walker, Michael, and O'Hayre, Ryan. Fri .  
"Tuning the Co/Fe ratio in BaCoxFe0.8–xZr0.1Y0.1O3–δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance".  United States.  https://doi.org/10.1039/d2ta03150g.  https://www.osti.gov/servlets/purl/1906318.

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@article{osti_1906318,

  title        = {Tuning the Co/Fe ratio in BaCoxFe0.8–xZr0.1Y0.1O3–δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance},

  author       = {Shin, Yewon and Kim, You-dong and Sanders, Michael and Harvey, Steven P. and Walker, Michael and O'Hayre, Ryan},

  abstractNote = {The triple conducting oxide BaCo0.4Fe0.4Zr0.1Y0.1O3–δ (BCFZY4411), which accommodates simultaneous transport of protons, oxygen ions, and p-type electronic carriers, has been intensively investigated in recent years as a high-performance positive electrode material for fuel cell and electrolysis applications. The heavy Co and Fe-based transition metal doping in BCFZY4411 ensures adequate electrical conductivity while the multiple oxidation states of Co and Fe assist the electrocatalytic and redox ability. Despite the considerable role of Co and Fe transition metal doping in controlling electrochemical activity, however, the study of alternative BCFZY compositions with varying Co/Fe ratios has not yet been pursued. Here, we evaluate the electrochemical performance of a series of BaCoxFe0.8–xZr0.1Y0.1O3–δ compositions with varying Co/Fe ratio (x = 0.1, 0.2, 0.4, 0.6, 0.7) and use oxygen ion tracer diffusion and in situ high-temperature X-ray diffraction to investigate the effect of Co/Fe ratio on electrocatalytic activity, electronic conductivity, oxygen ion incorporation and transport kinetics, and thermomechanical behavior. We find that Co-rich BCFZY7111 yields the highest performance due to exceptionally high oxygen vacancy diffusion and shows a lower and more linear thermal expansion behavior compared to Fe-rich compositions. A protonic ceramic button cell incorporating a BCFZY7111 positive electrode yields a peak power density of 695 mW cm–2 under fuel cell mode and an electrolysis current density of 1976 mA cm–2 at 1.4 V at 600 °C, underscoring the promise of this new BCFZY electrode composition.},

  doi          = {10.1039/d2ta03150g},

  journal      = {Journal of Materials Chemistry. A},

  number       = 46,

  volume       = 10,

  place        = {United States},

  year         = {Fri Nov 11 00:00:00 EST 2022},

  month        = {Fri Nov 11 00:00:00 EST 2022}

}

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Title: Tuning the Co/Fe ratio in BaCoxFe0.8–xZr0.1Y0.1O3–δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance

Abstract

Citation Formats

Title: Tuning the Co/Fe ratio in BaCo_xFe_0.8–xZr_0.1Y_0.1O_3–δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance