Conformal high-entropy oxide coatings enable fast and durable surface oxygen reactions

IF 35.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Joule Pub Date : 2025-06-18 DOI:10.1016/j.joule.2025.101957

Fan He , Hao Liu , Yangsen Xu , Feng Zhu , Kotaro Sasaki , YongMan Choi , Ying Liu , Yu Chen

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Abstract

Developing active and durable air electrodes for efficient oxygen reactions is challenging for protonic ceramic cells (PCCs), especially at temperatures below 550°C. In this study, we report a rationally designed conformal coating with a high-entropy PrNi_0.2Mn_0.2Co_0.2Fe_0.2Cu_0.2O_3−δ (PNMCFC) perovskite structure on the surface of a state-of-the-art PrBaCo₂O_5+δ (PBC) air electrode. The formed hybrid air electrode (PNMCFC-PBC) shows faster surface oxygen kinetics and a more stable phase structure in high-humidity air than the bare PBC electrode. Further density functional theory calculations suggest that the conformal coating mitigates Ba segregation at the interface and improves oxygen-related reactions, enhancing overall stability and electrocatalytic performance. The cells with the developed hybrid electrodes show encouraging electrochemical performance at 550°C: a polarization resistance of 0.72 Ω cm², a peak power density of 1.30 W cm⁻², an electrolysis current density of −1.36 A cm⁻² at 1.3 V, and reasonable operating stabilities (∼200 h at 550°C).

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保形高熵氧化物涂层可实现快速持久的表面氧反应

对于质子陶瓷电池（PCCs）来说，开发用于高效氧反应的活性和耐用的空气电极是一项挑战，特别是在低于550℃的温度下。在这项研究中，我们在最先进的PrBaCo2O5+δ (PBC)空气电极表面合理设计了具有高熵prni0.2 mn0.2 co0.2 fe0.2 cu0.2 2o3−δ (PNMCFC)钙钛矿结构的适形涂层。形成的混合空气电极（PNMCFC-PBC）在高湿空气中表现出比裸PBC电极更快的表面氧动力学和更稳定的相结构。进一步的密度泛函理论计算表明，保形涂层减轻了界面处的Ba偏析，改善了氧相关反应，提高了整体稳定性和电催化性能。采用复合电极的电池在550°C下表现出令人满意的电化学性能：极化电阻为0.72 Ω cm2，峰值功率密度为1.30 W cm - 2，电解电流密度为- 1.36 a cm - 2，在1.3 V下具有良好的工作稳定性（550°C下约200 h）。

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来源期刊

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.