Proton-conducting solid oxide fuel cells (H-SOFCs) are appealing for low-to-intermediate temperature operation due to their intrinsic lower activation energy and better ionic conductivity. Unfortunately, there are currently few acceptable and high-performing cathode materials available for H-SOFCs. Herein, we present a novel high performance multicomponent Ruddlesden-Popper (RP) type cathode Pr3Ni1.5Cu0.3Nb0.05Ta0.05Zr0.05Y0.05O7-δ (PNCNTZY) with superior triple conducting property. The multicomponent co-doping of Nb, Ta, Zr, and Y brings about the enhancement of configurational entropy and cocktail effect for improving H+/O2-/e- triple conductivity and oxygen vacancy concentration. Naturally, the ORR activity is improved by facilitated charge transfer and oxygen surface exchange, exhibiting reduced polarization resistance to just 0.24 Ω cm2 at 550 °C. When used as the cathode in H-SOFC single cells, excellent power production is demonstrated at 550 °C, with a peak power density of up to 0.84 W cm-2. Furthermore, the PNCNTZY sample shows adequate thermal compatibility with proton conductor electrolytes BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb) and then appropriate endurance durability (0.8 A cm-2 at 550 °C for about 250 h) due to their match of thermal expansion coefficient (TEC) brought about by the Co-free and partial replacement of larger-size elements. This extremely promising Co-free RP perovskite cathode for H-SOFCs produced by this work might provide a new type candidate and novel strategy for the commercialization of H-SOFCs.

中文翻译：

---

多组分掺杂在质子导电燃料电池阴极的无钴 Ruddlesden-Popper 型钙钛矿中实现了优异的三导电


质子导电固体氧化物燃料电池 （H-SOFC） 由于其固有的较低活化能和更好的离子电导率而适合中低温运行。遗憾的是，目前可用于 H-SOFC 的可接受和高性能的正极材料很少。在此，我们提出了一种新型的高性能多组分 Ruddlesden-Popper （RP） 型阴极 Pr3Ni1.5Cu0.3Nb0.05Ta0.05Zr0.05Y0.05O7-δ （PNCNTZY），具有优异的三导电性能。Nb、Ta、Zr 和 Y 的多组分共掺杂增强了构型熵和鸡尾酒效应，从而提高了 H+/O2-/e- 三重电导率和氧空位浓度。自然地，通过促进电荷转移和氧表面交换，ORR 活性得到改善，在 550 °C 时极化电阻降低到仅 0.24 Ω cm2。 当用作 H-SOFC 单电池中的阴极时，在 550 °C 下表现出出色的发电能力，峰值功率密度高达 0.84 W cm-2。此外，PNCNTZY 样品与质子导体电解质 BaZr0.1Ce0.7Y0.1Yb0.1O3-δ （BZCYYb） 具有良好的热相容性，然后由于它们与较大尺寸元素的无钴和部分替代带来的热膨胀系数 （TEC） 相匹配，表现出适当的耐久性（在 550 °C 下 0.8 A cm-2，持续约 250 h）。这项工作产生的这种非常有前途的用于 H-SOFC 的无钴 RP 钙钛矿阴极可能为 H-SOFC 的商业化提供一种新的候选类型和新的策略。