المؤلفون: Winterhalder, Franziska E., Farzin, Yousef A., Sohn, Yoo Jung, Lenser, Christian, Sebold, Doris, Guillon, Olivier, Weber, André, Menzler, Norbert H.

المصدر: Journal of Power Sources, 630, Art.-Nr.: 236084 ; ISSN: 0378-7753

مصطلحات موضوعية: Perovskite-based electrodes have gained interest as alternatives to Ni-cermet fuel electrodes in solid oxide electrolysis cells (SOECs). This study investigates strontium-iron-titanate (STF) as a potential all-ceramic fuel electrode for SOECs. The chemical stability of pure STF during SOEC operating conditions at open circuit voltage (OCV) and the chemical reactivity between STF and yttria-stabilized zirconia (YSZ) under manufacturing and operation conditions are analyzed. The pure STF appears to be quite stable during SOEC operation. However, the STF and YSZ electrolyte powder mixture shows chemical interaction during manufacturing and operation conditions, confirming the need for a barrier layer between those two materials. Furthermore, the electrochemical performance of electrolyte-supported symmetrical and full cells is tested at different temperatures (650–800 °C) and steam concentrations (3–90 % H2O). A mid-term degradation test in steam electrolysis operation for ca. 1700 h is carried out under thermoneutral conditions (i = −0.43 A cm−2) at 800 °C in 50 % H2O + 50 % H2. A low Rp degradation rate (0.162 Ω cm2 kh−1) for the investigated cell containing STF fuel electrode is obtained. However, the increasing ohmic resistance during the operational period caused an overpotential increase with a rate of 195 mV kh−1. Finally, post-test analyses showed sufficient chemical stability, representing STF as a potential candidate as fuel electrode in SOECs, ddc:620, Engineering & allied operations, info:eu-repo/classification/ddc/620

وصف الملف: application/pdf

Relation: info:eu-repo/semantics/altIdentifier/issn/0378-7753; https://publikationen.bibliothek.kit.edu/1000178282; https://publikationen.bibliothek.kit.edu/1000178282/156538488; https://doi.org/10.5445/IR/1000178282

الاتاحة: https://publikationen.bibliothek.kit.edu/1000178282
https://publikationen.bibliothek.kit.edu/1000178282/156538488
https://doi.org/10.5445/IR/1000178282

المؤلفون: Marmet, Philip

مصطلحات موضوعية: Solid Oxide Fuel Cell (SOFC), Digital materials design, Titanate, CGO, Ceramic fuel electrode, Virtual materials testing, Stochastic geometry, Microstructure modeling, Pluri-Gaussian method, Microstructure characterization, Composite conductivity, Multiphysics multiscale modeling, Effective property, Mixed Ionic Electronic Conductor (MIEC), Electrochemical impedance spectroscopy, Impedance response modeling, Noble metal catalyst, GeoDict, FIB tomography, Renewable energy, Energy conversion and storage, Microstructure optimization, info:eu-repo/classification/ddc/621.3

وصف الملف: application/pdf

Relation: https://doi.org/10.1039/D1CP01962G; https://doi.org/10.1039/D3YA00132F; https://doi.org/10.21256/zhaw-28430; https://hdl.handle.net/11475/28430; https://digitalcollection.zhaw.ch/handle/11475/28430

الاتاحة: https://hdl.handle.net/11475/28430
https://doi.org/10.21256/zhaw-28430
https://digitalcollection.zhaw.ch/handle/11475/28430