High-Entropy Perovskite Electrolyte for Protonic Ceramic Fuel Cells Operating below 600 °C

• Published in: ACS materials letters Vol. 4; no. 9; pp. 1646 - 1652
• Main Authors: Guo, Rui, He, Tianmin
• Format: Journal Article
• Language: English
• Published: American Chemical Society 05.09.2022
• ISSN: 2639-4979; 2639-4979
• DOI: 10.1021/acsmaterialslett.2c00542

High-entropy materials are attracting ever-increasing concern for their unique structural features and unprecedented potential applications. In this study, we design and successfully prepared single-phase high-entropy perovskite oxide (HEPO) BaSn0.16Zr0.24Ce0.35Y0.1Yb0.1Dy0.05O3−δ (BSZCYYbD) to use as a new class of proton conductor, which is first applied to protonic ceramic fuel cells (PCFCs) below 600 °C. The BSZCYYbD exhibits excellent chemical and structural stability, high densification, and mechanical properties. The protonic conduction in BSZCYYbD is proved by the proton-conductor isotope effect and hydration effect. The protonic conductivity of BSZCYYbD is the highest ever reached in the high-entropy proton conductors, which is 8.3 mS cm–1 in humidified air (3% H2O) at 600 °C. An anode-based PCFC with BSZCYYbD electrolyte (∼45 μm) demonstrates a favorable output of 318 mW cm–2 at 600 °C. Our study offers a strategy for the design of superior proton-conducting electrolytes based on HEPOs, which hold promise for diverse electrochemical applications.