Science Advances

This PDF file includes:

• fig. S1. XPS survey spectrum of NF/oLCFO-Ar.
• fig. S2. EDS pattern of NF/oLCFO-Ar.
• fig. S3. TEM imaging and corresponding EDS mapping of NF/oLCFO-Ar.
• fig. S4. Morphology characterization of NF + oLCFO.
• fig. S5. Stoichiometry characterization of perovskite oLCFO for NF + oLCFO and NF/oLCFO-Air.
• fig. S6. OER performance of NF + oLCFO, NF/oLCFO-Air, and NF/rLCFO-Ar as control samples.
• fig. S7. Morphology characterization of NF/oLCFO-Air.
• fig. S8. Morphology characterization of NF/rLCFO-Ar.
• fig. S9. XRD patterns of NF/rLCFO-Ar, NF/oLCFOH, and NF/rLCFOH perovskite hydroxide precursor.
• fig. S10. Stoichiometry characterization of perovskite oxide nanoparticles of NF/rLCFO-Ar.
• fig. S11. High-resolution (A) La 3d XPS spectrum and (B) Fe 2p XPS spectrum of NF/oLCFO-Ar, oLCFO perovskite oxide nanoparticles for NF + oLCFO and NF/oLCFO-Air, and NF/rLCFO-Ar.
• table S1. Summary of OER performance for comparison of in situ–hybridized NF/oLCFO-Ar with transition metal oxides/hydroxides.
• table S2. Summary of the preparation methods of hybrid electrocatalysts.

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