Faradaic efficiency in protonic-ceramic electrolysis cells

Zhu, Huayang; Ricote, Sandrine; Kee, Robert J.

doi:10.1088/2515-7655/ac3729

Title: Faradaic efficiency in protonic-ceramic electrolysis cells

Journal Article · 20 January 2022 · JPhys Energy

DOI: https://doi.org/10.1088/2515-7655/ac3729 · OSTI ID:1841281

Zhu, Huayang; Ricote, Sandrine;

Abstract Proton-conducting ceramics (e.g. doped barium zirconates or cerates) are typically mixed ionic-electronic conductors (MIECs). The electronic conduction, typically in the form of positively charged small polarons or electron holes, leads to ‘electronic leakage.’ In an ideal steam-electrolysis cell, one gas-phase H ₂ molecule is produced from every two electrons delivered from an external power source. In other words, such ideal behavior achieves 100% faradaic efficiency. However, the electronic flux associated with MIEC membranes contributes to reduced faradaic efficiency. The present paper develops a model that predicts the behavior of faradaic efficiency as a function of electrolysis-cell operating conditions. Although the model framework is more general, the paper focuses on the behavior of a cell based upon a BaCe _0.7 Zr _0.1 Y _0.1 Yb _0.1 O $_{3 - δ}$ (BCZYYb) membrane. The study predicts the effects of operating conditions, including temperature, pressure, and gas compositions.

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Sponsoring Organization:: USDOE; USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000808

OSTI ID:: 1841281

Journal Information:: JPhys Energy, Journal Name: JPhys Energy Journal Issue: 1 Vol. 4; ISSN 2515-7655

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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