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Favorable Amorphous-Crystalline Phase Boundaries for Boosted Alkaline Water Oxidation.

Interfacial engineering has proven to be an effective strategy for designing high-performance water-oxidation catalysts. And interface construction combining the respective advantages of amorphous and crystalline phases, especially embedding amorphous phases in crystalline lattices, is becoming the focus of intensive researches. In this work, for the first time, we construct amorphous FeOOH-crystalline FeOOH phase boundary (a-c FeOOH) by structural evolution of Fe oxyhydroxide-isolated Fe(OH) 3 precursors from one-step hydrothermal synthesis. a-c FeOOH demonstrates superb electro-activity for 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 FeOOH and crystalline FeOOH alone. Density functional theory calculations revealed that the high-density a-c phase boundaries play critical role for the high OER activity.