Active Motif Change of Ni-Fe Spinel Oxide by Ir Doping for Highly Durable and Facile Oxygen Evolution Reaction

Sukhwa Hong, Kahyun Ham, Jeemin Hwang, Sinwoo Kang, Min Ho Seo, Young Woo Choi, Byungchan Han, Jaeyoung Lee, Kangwoo Cho

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3 Citations (Scopus)


The oxygen evolution reaction (OER) is crucial for producing sustainable energy carriers. Herein, Ir (5 mol.%) doped inverse-spinel NiFe2O4 (Ir-NFO) nanoparticles deposited on Ni foam (NF) by scalable solution casting are considered a promising OER electrocatalyst for industrial deployments. The Ir-NFO/NF (with minimal lattice distortion by uniform Ir doping) provides an OER overpotential of 251 mV (intrinsically outperforming NFO/NF and benchmarking IrO2/NF) and extraordinary robustness over 130 days at 100 mA cm−2. In situ X-ray absorption spectroscopy reveals oxidation only for Fe on NFO, whereas concurrent generation of higher-valent Ni and Fe occurs on Ir-NFO during OER. Density functional theory calculations further demonstrate that Ir substitutes the sublayer Ni octahedral site and switches the main active reaction center from FeOh FeTd bridge site (Fe O Fe) on NFO to NiOh–FeTd bridge site (Ni O Fe active motif) on Ir-NFO for a co-catalytic OER. This study sheds new light on precious-metal doped Ni-Fe oxides, which may be applicable to other binary/ternary oxide electrocatalysts.

Original languageEnglish
Article number2209543
JournalAdvanced Functional Materials
Issue number1
Publication statusPublished - 2023 Jan 3

Bibliographical note

Funding Information:
S.H., K.H., and J.H. contributed equally to this work. This work was financially supported by National Research Foundation of Korea (NRF) grant funded by the Ministry of Education (2022R1A6A3A13066016) and the Korea government Ministry of Science and ICT (MSIT) (2022R1A2C4001228, 2021M3I3A1084818, and 2021K1A4A8A01079455) and framework of the research and development program of the Korea Institute of Energy Research (C2‐2475).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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