Ultrastable and Moisture-Adaptive Ozone Decomposition over FeOOH@NiFe-LDH via Interfacial Ni–O–Fe Bonds

Catalytic decomposition is regarded as a promising strategy for eliminating residual ozone (O 3 ) in ambient environments. However, most catalysts suffer from rapid deactivation under humid conditions due to competitive H 2 O adsorption and accumulation of peroxide intermediates (O 2 2– ). Here, we report a moisture-adaptive FeOOH@NiFe layered double hydroxide (LDH) catalyst that enables efficient and stable O 3 decomposition by interfacial Ni–O–Fe bond engineering. Unlike conventional vacancy-dominated mechanisms, the FeOOH@NiFe-LDH catalyst actively utilizes water as a cooperative reactant through adaptive surface reconstruction into Ni(Fe)OOH species during reaction. In situ spectroscopy combined with density functional theory calculations reveal that interfacial electronic coupling between FeOOH and NiFe-LDH promotes synergistic activation of O 3 and H 2 O, lowers reaction energy barriers, and suppresses the accumulation of deactivating O 2 2– . As a result, FeOOH@NiFe-LDH achieves nearly complete O 3 conversion at a high space velocity (1200 L g –1 h –1 ) across a wide humidity range and retains 100% efficiency even after more than 140 h of reaction. Importantly, the catalyst preserves its activity upon kilogram-scale synthesis and demonstrates rapid O 3 removal in a 30 m 3 environmental chamber. This work establishes an interfacial, moisture-adaptive catalytic paradigm for O 3 abatement and provides practical design principles for air pollution control under realistic humid conditions.