Entropy-driven order-to-disorder transition in perovskite anodes for high-performance solid oxide fuel cells.

Authors

Gaige Wang, Rongzheng Ren, Xiaodan Yu, Chunming Xu, Jinshuo Qiao, Wang Sun, Zhenhua Wang, Kening Sun

Published in

Nature communications. Jun 19, 2026. Epub Jun 19, 2026.

Abstract

Solid oxide fuel cells (SOFCs) enable direct and efficient conversion of transportable hydrocarbons into electricity, offering a scalable pathway for carbon-neutral energy systems. A critical challenge in SOFC development lies in the atomic-scale structural regulation of perovskite-type anodes, which is essential for enhancing hydrocarbon oxidation kinetics while mitigating carbon deposition issues. To overcome this fundamental limitation, we propose an entropy-driven strategy to induce order-to-disorder transitions in perovskite oxides. This strategy is demonstrated in the layered ordered perovskite PrBaFe₂O_5+δ, where the introduction of five equimolar rare-earth cations at the Pr site results in the formation of a disordered A-site high-entropy perovskite anode with the composition La_0.2Pr_0.2Sm_0.2Gd_0.2Y_0.2BaFe₂O_5+δ (HEP). Such atomic-scale order-to-disorder transitions facilitate oxygen vacancy formation and improve anode hydration capacity, thereby accelerating both hydrocarbon steam reforming and carbon elimination processes. The designed HEP anode exhibits a peak power density of 774.53 mW·cm^-2 and stability over 1000 hours under wet methane (3 vol% H₂O) at 700 °C. The present work contributes a new strategy for controlling ion ordering in perovskite oxides, addressing key challenges in SOFC operating with hydrocarbon fuels.

PMID:
42315523
Bibliographic data and abstract were imported from PubMed on 19 Jun 2026.

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