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journal article·2026-02

Doping‐Enabled Symmetry Control in BaCoO 3 for Enhanced Oxygen Reduction Reaction

Sejong Ahn, Kyu In Shim, Hyunseung Kim, Seongwoo Nam, Yeongtaek Hong, DongHwan Oh, Uisik Kim, Jun Hyuk Kim, Jeong Woo Han, WooChul Jung

Small· Volume 22· Issue 9
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Source abstract

Abstract

Abstract Stabilizing crystal structure is a powerful route to unlock new functionalities in perovskite oxides. BaCoO 3 (BCO) derivatives are a versatile platform for designing mixed ionic–electronic conductors for solid oxide fuel cell (SOFC) cathodes, yet their stable hexagonal structure limits performance unless transformed into the cubic perovskite phase. Here, seven compositions are systematically investigated —undoped BCO and Sc‐, Y‐, Zr‐, Hf‐, Nb‐, and Ta‐doped variants—and show that the hexagonal‐to‐cubic transition is the decisive factor governing oxygen reduction kinetics. Among the dopants, Ta proves most effective, achieving a polarization resistance as low as ≈0.004 Ω cm 2 at 650 °C, by promoting cubic symmetry, which balances oxygen ion transport, oxygen vacancy formation, and surface oxygen adsorption. These findings highlight chemical doping as an effective means to stabilize cubic BCO and offer general design principles for tailoring crystal symmetry and functionality in perovskite oxides for electrochemical energy conversion.
Source: crossref · Quality: baseline

Research context

Energy storageElectronic materials

OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electrocatalysts for Energy Conversion · Magnetic and transport properties of perovskites and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Research Institute of Advanced Materials Seoul National University 1, Gwanak‐ro, Gwanak‐gu Seoul 08826 Republic of Korea

Department of Materials Science and Engineering Seoul National University 1, Gwanak‐ro, Gwanak‐gu Seoul 08826 Republic of Korea

Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) 291, Daehak‐ro, Yuseong‐gu Daejeon 34141 Republic of Korea

Department of Chemical and Biomolecular Engineering (BK21 Four) Korea Advanced Institute of Science and Technology (KAIST) 291, Daehak‐ro, Yuseong‐gu Daejeon 34141 Republic of Korea

Korea Electric Power Corp. Research Institute 105, Munji‐ro, Yuseong‐gu Daejeon 34056 Republic of Korea

Department of Future Energy Engineering Sungkyunkwan University 2066, Seobu‐ro, Jangan‐gu Suwon 16419 Republic of Korea

SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University 2066, Seobu‐ro, Jangan‐gu Suwon 16419 Republic of Korea

Funding

National Research Foundation of Korea · Korea Electric Power Corporation

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