Designing highly efficient interface catalysts with new interface-enhancing mechanisms for the oxygen reduction reaction (ORR) in acid solution still remains a significant challenge. Here, we report a class of stable PtFe-Fe₂C Janus-like nanoparticle (NP) interface catalysts with an unrevealed barrier-free interface electron-transfer property that greatly boosts ORR catalytic activity and stability. The PtFe-Fe₂C Janus-like NPs showed much higher catalytic activity for ORR than either PtFe or Fe₂C NPs in both acidic and alkaline electrolytes. Density functional theory simulations revealed that a barrier-free interface electron transfer on the interface of PtFe-Fe₂C Janus-like NPs is the main factor in enhancing ORR activity. This interface electron-transfer property makes them the most active for ORR among all reported PtFe-based nanocatalysts. We further demonstrate that this barrier-free interface electron-transfer property can be readily generalized to other systems, such as the hydrogen evolution reaction and H₂O₂ reduction electrocatalysis, to achieve better electrocatalytic enhancement.

对于酸溶液中的氧还原反应（ORR），使用新的界面增强机制设计高效的界面催化剂仍然是一个巨大的挑战。在这里，我们报告了一类稳定的PtFe-Fe ₂ C Janus样纳米颗粒（NP）界面催化剂，具有未公开的无障碍界面电子转移性质，极大地提高了ORR催化活性和稳定性。在酸性和碱性电解质中，PtFe-Fe ₂ C Janus样NPs的ORR催化活性都比PtFe或Fe ₂ C NPs高得多。密度泛函理论模拟表明PtFe-Fe ₂界面上无障碍界面电子转移C Janus样NP是增强ORR活性的主要因素。这种界面电子转移特性使它们在所有报道的基于PtFe的纳米催化剂中对ORR最为活跃。我们进一步证明，这种无障碍界面的电子转移性质可以很容易地推广到其他系统，例如析氢反应和H ₂ O ₂还原电催化，以实现更好的电催化作用。