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Peer-reviewedCC BYNature communications

Interface-driven boost in the performance and stability of protonic ceramic electrochemical cells.

  • Hyun Sik Yoo1
  • Jongseo Lee2
  • Soyeon Kim1
  • Joon Gyu Kim1
  • Sehee Bang1
  • Yuhan Jung1
  • Donguk Kim1
  • Yue Wen1
  • Min Hyung Bae1
  • Bong Hyun Seo1
  • Ji Won Suk1,3,4
  • Wonyoung Lee5,6,7
7 affiliations
  1. 1School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea.
  2. 2Advanced Defense Science and Technology Research Institute, Agency for Defense Development, Daejeon, Republic of Korea.
  3. 3Department of Smart Fab. Technology, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea.
  4. 4SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea.
  5. 5School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea. [email protected].
  6. 6SKKU Institute of Energy Science and Technology (SIEST), Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea. [email protected].
  7. 7SKKU National Lab for Intelligent Energy Solution Technology (SIEST), Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea. [email protected].
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Abstract

Interfacial resistance remains a key challenge in developing high-performance and durable protonic ceramic electrochemical cells (PCECs), especially at low temperatures. Here, we present a systematic interface engineering strategy that quantitatively correlates interfacial contact coverage with electrochemical performance. A thin and dense PrBa0.5Sr0.5Co1.5Fe0.5O5+δ interlayer is fabricated via low-cost and scalable precursor-based electrostatic spray deposition on a BaZr0.4Ce0.4Y0.1Yb0.1O3-δ electrolyte, achieving a nearly complete contact coverage of 92.6 ± 0.6%. Equivalent circuit-based impedance modeling confirms that the improved contact coverage reduced both the interfacial ohmic and polarization resistances. The interface-engineered PCEC achieves a peak power density of 1.01 W/cm² in fuel cell mode and a current density of 1.15 A/cm² at 1.3 V in electrolysis mode at 500 °C. It also demonstrates improved interfacial mechanical integrity, preventing delamination under harsh thermal cycling, long-term operational stability, and fuel flexibility with direct ammonia and methane.

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Cite

BibTeXRIS
BibTeX
@article{yoo2026interfacedriven,
  title = {{Interface-driven boost in the performance and stability of protonic ceramic electrochemical cells.}},
  author = {Hyun Sik Yoo and Jongseo Lee and Soyeon Kim and Joon Gyu Kim and Sehee Bang and Yuhan Jung and Donguk Kim and Yue Wen and Min Hyung Bae and Bong Hyun Seo and Ji Won Suk and Wonyoung Lee},
  journal = {Nature communications},
  year = {2026},
  month = sep,
  doi = {10.1038/s41467-026-77561-6},
  url = {https://europepmc.org/article/MED/42897142},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Interface-driven boost in the performance and stability of protonic ceramic electrochemical cells.
AU  - Hyun Sik Yoo
AU  - Jongseo Lee
AU  - Soyeon Kim
AU  - Joon Gyu Kim
AU  - Sehee Bang
AU  - Yuhan Jung
AU  - Donguk Kim
AU  - Yue Wen
AU  - Min Hyung Bae
AU  - Bong Hyun Seo
AU  - Ji Won Suk
AU  - Wonyoung Lee
PY  - 2026
DA  - 2026/09/17
JO  - Nature communications
DO  - 10.1038/s41467-026-77561-6
UR  - https://europepmc.org/article/MED/42897142
AB  - Interfacial resistance remains a key challenge in developing high-performance and durable protonic ceramic electrochemical cells (PCECs), especially at low temperatures. Here, we present a systematic interface engineering strategy that quantitatively correlates interfacial contact coverage with electrochemical performance. A thin and dense PrBa0.5Sr0.5Co1.5Fe0.5O5+δ interlayer is fabricated via low-cost and scalable precursor-based electrostatic spray deposition on a BaZr0.4Ce0.4Y0.1Yb0.1O3-δ electrolyte, achieving a nearly complete contact coverage of 92.6 ± 0.6%. Equivalent circuit-based impedance modeling confirms that the improved contact coverage reduced both the interfacial ohmic and polarization resistances. The interface-engineered PCEC achieves a peak power density of 1.01 W/cm² in fuel cell mode and a current density of 1.15 A/cm² at 1.3 V in electrolysis mode at 500 °C. It also demonstrates improved interfacial mechanical integrity, preventing delamination under harsh thermal cycling, long-term operational stability, and fuel flexibility with direct ammonia and methane.
SN  - 2041-1723
ER  -