Interface engineering has proven an effective strategy for designing high‐performance water‐oxidation catalysts. Interface construction combining the respective advantages of amorphous and crystalline phases, especially embedding amorphous phases in crystalline lattices, has been the focus of intensive research. This study concerns the construction of an amorphous−crystalline FeOOH phase boundary (a−c‐FeOOH) by structural evolution of iron oxyhydroxide‐isolated Fe(OH)₃ precursors from one‐step hydrothermal synthesis. a−c‐FeOOH demonstrates superb electrocatalytic activity for the oxygen evolution reaction (OER) with overpotential of 330 mV to drive a current density of 300 mA cm⁻² in 1.0 m KOH, which is among the best OER catalysts and much better than the pristine amorphous or crystalline FeOOH alone. Density functional theory calculations reveal that the high‐density a−c phase boundaries play a critical role in determining high OER activity.

中文翻译：

---

用于增强碱性水氧化的有利的非晶态结晶氢氧化铁相边界。

界面工程已被证明是设计高性能水氧化催化剂的有效策略。结合非晶和结晶相各自优点的界面构造，特别是将非晶相嵌入晶格中，已成为深入研究的重点。这项研究涉及通过一步水热合成法制备的羟基氧化铁分离的Fe（OH）₃前体的结构演化，从而形成无定形的结晶FeOOH相界（ac-FeOOH）。ac-FeOOH表现出对放氧反应（OER）的超强电催化活性，超电势为330 mV，可在1.0  m内驱动300 mA cm ^-2的电流密度KOH是最好的OER催化剂之一，并且比单独的原始无定形或结晶FeOOH更好。密度泛函理论计算表明，高密度交流相界在确定高OER活性中起关键作用。