Interface engineered NiFe2O4−x/NiMoO4 nanowire arrays for electrochemical oxygen evolution

Juhyung Choi, Daekyu Kim, Weiran Zheng, Bingyi Yan, Yong Li, Lawrence Yoon Suk Lee*, Yuanzhe Piao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

144 Scopus citations


Designing highly active and stable electrocatalysts for oxygen evolution reaction (OER) is the key to success in sustainable water splitting reaction, a sustainable route towards high purity hydrogen production. Interface engineering is one of the most effective strategies for modulating the local electronic structure of active sites to enhance catalytic activity. Herein, NiFe2O4−x nanoparticles were integrated to NiMoO4 nanowires (NiFe2O4−x/NMO) grown on nickel foam to construct an extended interface with strong electronic interactions. The NiFe2O4−x/NMO demonstrates high OER activities as manifested by a low overpotential of 326 mV at a high current density of 600 mA cm−2 and good long-term stability. The intimate interface between NiFe2O4−x and NiMoO4 is responsible for the Fe-facilitated phase transition to active γ-NiOOH phase as revealed by in situ Raman spectroelectrochemical studies. This study outlines how the interface design of integrated nanostructures can optimize the formation of active phase for enhanced catalytic activity.

Original languageEnglish
Article number119857
JournalApplied Catalysis B: Environmental
StatePublished - 5 Jun 2021
Externally publishedYes


  • Active surface phase
  • Electrocatalysis
  • Interface engineering
  • Oxygen evolution reaction
  • Prussian blue analog


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