2025-08-01 CL20250801_002_#47_Co3O4Nps_CV_5mVpers_after_CA_1h_at_0p8V_MSE_eq_1p73V_RHE_seq1

Elab Identifier: , Preparation Procedure: The Co₃O₄ nanoparticle electrodes with a high catalyst loading (42.7 µg cm-2) were fabricated by drop-casting 100 µL of Co₃O₄ ink onto a gold-coated quartz crystal microbalance (QCM) resonator, which served as the substrate. The ink was prepared by dispersing Co₃O₄ nanoparticles in Milli-Q water to achieve a concentration of 0.5 mg mL⁻¹.