A New Family of Proton‐Conducting Electrolytes for Reversible Solid Oxide Cells: BaHf x Ce 0.8− x Y 0.1 Yb 0.1 O 3− δ

Murphy, Ryan; Zhou, Yucun; Zhang, Lei; Soule, Luke; Zhang, Weilin; Chen, Yu; Liu, Meilin

doi:10.1002/adfm.202002265

A New Family of Proton‐Conducting Electrolytes for Reversible Solid Oxide Cells: BaHf _x Ce _0.8− _x Y _0.1 Yb _0.1 O ₃₋ _δ

Journal Article · Thu Jul 09 00:00:00 EDT 2020 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202002265· OSTI ID:1637998

Murphy, Ryan ^[1]; ^[1]; Zhang, Lei ^[1]; Soule, Luke ^[1]; Zhang, Weilin ^[1]; Chen, Yu ^[1]; ^[1]

School of Materials Science and Engineering Center for Innovative Fuel Cell and Battery Technologies Georgia Institute of Technology Atlanta GA 30332‐0245 USA

Abstract

Reversible solid oxide cells based on ceramic proton conductors have potential to be the most efficient system for large‐scale energy storage. The performance and long‐term durability of these systems, however, are often limited by the ionic conductivity or stability of the proton‐conducting electrolyte. Here new family of solid oxide electrolytes, BaHf _x Ce _0.8− _x Y _0.1 Yb _0.1 O ₃₋ _δ (BHCYYb), which demonstrate a superior ionic conductivity to stability trade‐off than the state‐of‐the‐art proton conductors, BaZr _x Ce _0.8− _x Y _0.1 Yb _0.1 O ₃₋ _δ (BZCYYb), at similar Zr/Hf concentrations, as confirmed by thermogravimetric analysis, Raman, and X‐ray diffraction analysis of samples over 500 h of testing are reported. The increase in performance is revealed through thermodynamic arguments and first‐principle calculations. In addition, lab scale full cells are fabricated, demonstrating high peak power densities of 1.1, 1.4, and 1.6 W cm ⁻² at 600, 650, and 700 °C, respectively. Round‐trip efficiencies for steam electrolysis at 1 A cm ⁻² are 78%, 72%, and 62% at 700, 650, and 600 °C, respectively. Finally, CO ₂ H ₂ O electrolysis is carried out for over 700 h with no degradation.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1637998

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 35 Vol. 30; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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