Novel high-entropy BaCo0.2Zn0.2Ga0.2Zr0.2Y0.2O3-δ cathode for proton ceramic fuel cells
Novel high-entropy BaCo0.2Zn0.2Ga0.2Zr0.2Y0.2O3-δ cathode for proton ceramic fuel cells
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DOI：
10.1016/j.ceramint.2023.09.166
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发表时间：
2023-10-18
影响因子：
5.2
通讯作者：
Chi，Bo
中科院分区：
文献类型：
--
作者：
Yang，Chenghao;Li，Jin;Chi，Bo
钴基钙钛矿正极材料的高热膨胀系数对其在质子传导固体氧化物燃料电池(H-SOFC)中的应用提出了挑战。为了解决钴基钙钛矿阴极与质子导电电解液之间的界面退化/分离问题，我们设计并制备了高熵钙钛矿氧化物BaCo0.2Zn0.2Ga0.2Zr0.2Y0.203-δ(BCx)作为质子导电固体氧化物燃料电池(H-SOFC)的阴极。BCX在氧还原反应中表现出优异的性能和稳定性，通过结构分析和电化学表征得到了验证。与未掺杂BaCoO_3-−(BC)的18.69T×10~(-6)K−相比，BCx的TEC低至12.75T×10~(-6)Kδ_1。在600℃时，BCX阴极的极化电阻约为0.69Ω/cm2，远低于原始BC阴极的极化电阻(1.27Ω/cm2)。采用BCX阴极的电池具有显著的长期稳定性，在100小时内没有明显的降解。
The application of cobalt-based perovskite cathode materials in proton-conducting SOFCs (H–SOFCs) is challenged by their high thermal expansion coefficient (TEC). To address interface degradation/separation between the cobalt-based perovskite cathode and the proton-conducting electrolyte, we design and prepare the high-entropy perovskite oxide (HEPO) BaCo0.2Zn0.2Ga0.2Zr0.2Y0.2O3-δ(BCX) as the cathode for proton-conducting SOFCs (H–SOFCs). BCX demonstrates remarkable performance and stability in the oxygen reduction reaction, validated through structural analysis and electrochemical characterizations. The TEC of BCX is as low as 12.75 × 10-6K−1compared to the 18.69 × 10-6K−1of the un-doped BaCoO3-δ(BC). The polarization resistance of BCX cathode about 0.69 Ω cm2is realized at 600 °C, much lower than that for pristine BC cathode (1.27 Ω cm2). Cell with BCX cathode exhibits remarkable long-term stability without detectable degradation over 100 h.