The rGO-Co₃O₄-Pt/SPEs exhibit a sharp increase in peak current with increasing H₂O₂ concentrations (up to 2.5 µM) in 0.1 M KCl, as shown in Figure . The linear calibration curve in the inset (insert ii) confirms the sensitivity of the modified electrode for H₂O₂ detection, demonstrating a direct correlation between peak current and H₂O₂ concentration. This linearity suggests diffusion-controlled electrochemical behavior, consistent with other rGO-based composites, where high surface area and conductivity enhance electron transfer. The increased sensitivity shows that SWV is better than CV for precise analysis. The limit of detection (LOD) was calculated using the formula LOD=3σB/s, where σB represents the standard deviation calculated for blank measurements, and s is the slope of the calibration curve. The limit of quantification (LOQ) was calculated as LOQ=3.3×LOD. In this study, the blank measurement standard deviation was 0.06, giving an LOD of about 0.16 µM and an LOQ of 0.54 µM. The performance of the rGO-Co₃O₄-Pt composite in detecting H₂O₂ was compared to several other reported H₂O₂ sensors (Table ).