Boosting the electrochemical water oxidation reaction of hierarchical nanoarrays through NiFe-oxides/Ag heterointerfaces.

Fabricating heterointerfaces with optimized electronic structures is a robust strategy to boost the activity of electrocatalysts. Herein, for the first time, we demonstrate that the heterointerfaces of metallic Ag and NiFe-oxides on hierarchical nanoarrays facilitate the charge transfer during the OER and optimize the electronic state of NiFe-oxides, thereby significantly boosting the activity for the OER.