Oxidative Atmosphere-Driven Formation of Single-Phase Spinel CuRh 2 O 4 Nanofibers for Alkaline Water Oxidation
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Cu–Rh bimetallic single-phase spinel oxide nanofibers were synthesized via electrospinning followed by post-annealing under precisely controlled oxidative environments. By systematically tuning the O 2 concentration in He carrier flow during the annealing process, the optimal atmosphere was identified to produce phase-pure CuRh 2 O 4 . The as-prepared CuRh 2 O 4 nanofibers exhibited excellent electrocatalytic performance toward the oxygen evolution reaction in 1.0 M NaOH ( aq ), highlighting the importance of atmosphere-controlled thermal treatment for engineering high-activity spinel oxide electrocatalysts.