Decoupling Electronic–Ionic Transport and Catalysis Enables High‐Performance, Chemically Stable Sr‐Free Air Electrodes for High‐Temperature Solid Oxide Cells
6 affiliations
- 1Hydrogen Energy Materials Research Center Korea Institute of Science and Technology Seoul Republic of Korea
- 2School of Mechanical Engineering Yonsei University Seoul Republic of Korea
- 3Nanomaterials Science and Engineering Korea University of Science and Technology (UST) KIST Campus Seoul Republic of Korea
- 4Department of Future Energy Engineering Sungkyunkwan University Suwon Republic of Korea
- 5SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University Suwon Republic of Korea
- 6Materials Research & Engineering Center Hyundai Motor Company Uiwang‐si Gyeonggi‐do Republic of Korea
Abstract
Although strontium is a major origin of various degradation mechanisms in high‐temperature electrochemical cells, it is inevitably employed as an A‐site dopant in perovskite air electrodes to ensure adequate functionality. Herein, we report a high‐performance Sr‐free air electrode achieved by independently tailoring electronic conduction, ionic transport, and surface catalytic activity. High electronic conductivity is realized using multi‐valent B‐site perovskites with fully La‐occupied A‐sites, while efficient ionic transport is provided by oxygen‐interstitial Ruddlesden–Popper phases without Sr doping. Moreover, highly active nanocatalysts are incorporated via infiltration to accelerate surface reaction kinetics, enabling electrochemical performance comparable to that of state‐of‐the‐art Sr‐containing electrodes. Full cells employing this electrode exhibit exceptional durability under harsh electrolysis conditions, particularly under severe Cr vapor exposure. While conventional Sr‐based electrodes exhibit rapid degradation of ∼15% within 100 h owing to reactions between segregated Sr and Cr vapor, the Sr‐free electrode maintains stable performance with no detectable decay over 200 h of continuous operation. This design strategy offers a scalable and immediately applicable pathway to resolve critical durability issues in high‐temperature electrochemical energy systems.
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BibTeX
@article{won2026decoupling,
title = {{Decoupling Electronic–Ionic Transport and Catalysis Enables High‐Performance, Chemically Stable Sr‐Free Air Electrodes for High‐Temperature Solid Oxide Cells}},
author = {Ji‐eun Won and Wooseok Lee and Jaehyun Seo and Dogeun Yoon and Ho‐Il Ji and HeeChan Kang and Jun Hyuk Kim and Hwitae Kim and Ji Wan Kim and Jongsup Hong and Kyung Joong Yoon},
journal = {Advanced Science},
year = {2026},
month = aug,
doi = {10.1002/advs.77023},
url = {https://doi.org/10.1002/advs.77023},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Decoupling Electronic–Ionic Transport and Catalysis Enables High‐Performance, Chemically Stable Sr‐Free Air Electrodes for High‐Temperature Solid Oxide Cells
AU - Ji‐eun Won
AU - Wooseok Lee
AU - Jaehyun Seo
AU - Dogeun Yoon
AU - Ho‐Il Ji
AU - HeeChan Kang
AU - Jun Hyuk Kim
AU - Hwitae Kim
AU - Ji Wan Kim
AU - Jongsup Hong
AU - Kyung Joong Yoon
PY - 2026
DA - 2026/08/05
JO - Advanced Science
DO - 10.1002/advs.77023
UR - https://doi.org/10.1002/advs.77023
AB - Although strontium is a major origin of various degradation mechanisms in high‐temperature electrochemical cells, it is inevitably employed as an A‐site dopant in perovskite air electrodes to ensure adequate functionality. Herein, we report a high‐performance Sr‐free air electrode achieved by independently tailoring electronic conduction, ionic transport, and surface catalytic activity. High electronic conductivity is realized using multi‐valent B‐site perovskites with fully La‐occupied A‐sites, while efficient ionic transport is provided by oxygen‐interstitial Ruddlesden–Popper phases without Sr doping. Moreover, highly active nanocatalysts are incorporated via infiltration to accelerate surface reaction kinetics, enabling electrochemical performance comparable to that of state‐of‐the‐art Sr‐containing electrodes. Full cells employing this electrode exhibit exceptional durability under harsh electrolysis conditions, particularly under severe Cr vapor exposure. While conventional Sr‐based electrodes exhibit rapid degradation of ∼15% within 100 h owing to reactions between segregated Sr and Cr vapor, the Sr‐free electrode maintains stable performance with no detectable decay over 200 h of continuous operation. This design strategy offers a scalable and immediately applicable pathway to resolve critical durability issues in high‐temperature electrochemical energy systems.
SN - 2198-3844
ER -