Exploring efficient Pd-based materials with anticorrosion performance in acidic medium is still challenging for electrocatalysis. Herein, yolk-shell L1₀-PdFe@C nanoreactors are constructed to enhance the anticorrosive performance and activity toward oxygen reduction reaction (ORR). Benefited from engineering supports and location of L1₀-PdFe nanoparticles, the stability toward ORR is significantly improved during accelerated degradation tests (ADT) in both acidic and alkaline mediums, outperforming that of state-of-the-art Pt/C catalysts. As evidenced by the structural characterizations, the active Pd sites in porous L1₀-PdFe@C nanoreactors are well reserved with structure ordered PdFe intermetallics and redeposited Pd nanoparticles, while carbon supported Pd/C and PdFe/C nanoparticles go through severe corrosion and growth after ADT. This work provides a strategy to enhance the durability of catalysts through combining the merits of nanoreactors and ordered intermetallics.

中文翻译：

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用于超防腐电催化的原子有序 L10-PdFe 金属间化合物的工程定位和支持

探索在酸性介质中具有防腐性能的高效 Pd 基材料对于电催化仍然具有挑战性。在此，构建了蛋黄壳L1 ₀ -PdFe@C 纳米反应器，以提高对氧还原反应 (ORR) 的防腐性能和活性。得益于L1 ₀ -PdFe 纳米颗粒的工程支撑和定位，在酸性和碱性介质中的加速降解测试 (ADT) 中，ORR 的稳定性显着提高，优于最先进的 Pt/C 催化剂。正如结构表征所证明的，多孔L1 _{0中的活性 Pd 位点}-PdFe@C纳米反应器保留了结构有序的PdFe金属间化合物和再沉积的Pd纳米颗粒，而碳负载的Pd/C和PdFe/C纳米颗粒在ADT后经历了严重的腐蚀和生长。这项工作提供了一种通过结合纳米反应器和有序金属间化合物的优点来提高催化剂耐久性的策略。