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Related Experiment Video

Updated: May 17, 2025

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Published on: October 27, 2018

Understanding (La,Sr)(Co,Fe)O_3-δ Phase Instability within SOECs Using a Combined Experimental and Atomistic Modeling

Heather S Slomski^1,2, Jonas L Kaufman³, Michael J Dzara²

¹Colorado School of Mines, Golden, Colorado 80401, United States.

ACS Physical Chemistry Au

|March 31, 2025

Summary

This summary is machine-generated.

Degradation in solid oxide electrolysis cells (SOECs) stems from strontium (Sr) migration in the air electrode, forming unwanted phases. This instability highlights the need for more robust SOEC materials for efficient operation.

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Last Updated: May 17, 2025

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

Area of Science:

Materials Science
Electrochemistry
Chemical Engineering

Background:

Solid oxide electrolysis cells (SOECs) are crucial for energy conversion but suffer from air electrode degradation, impacting performance and stability.
Understanding degradation mechanisms is key to improving SOEC longevity and efficiency.

Purpose of the Study:

To investigate early-onset degradation phenomena in SOEC air electrodes.
To identify structural and chemical changes in the air electrode material under operational conditions.

Main Methods:

Characterization of SOECs before and after 1000 hours of potentiostatic testing at 1.3 V and 750 °C.
Utilized synchrotron X-ray diffraction (XRD), scanning transmission electron microscopy with energy dispersive X-ray spectroscopy (STEM-EDS), and X-ray absorption near-edge spectroscopy (XANES).
Employed atomistic simulations and first-principles calculations to complement experimental findings.

Main Results:

Observed migration of strontium (Sr) species from the La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) air electrode towards the electrolyte.
Identified the formation of SrZrO₃ at the electrolyte boundary due to reactions between migrated Sr and YSZ electrolyte.
First-principles calculations confirmed the thermodynamic instability of LSCF-6428 under SOEC manufacturing and testing conditions.

Conclusions:

The LSCF air electrode material is thermodynamically unstable under SOEC operating conditions, leading to degradation.
Strontium migration and subsequent phase formation are primary degradation pathways in these SOECs.
Development of more stable air electrode materials is essential for advancing SOEC technology.