The interference study, shown in Figure , proves that the rGO-Co₃O₄-Pt/SPEs nanocomposite sensor is selective for H₂O₂. The electrode gives a clear and strong response to 5 μM H₂O₂, while the responses to other substances like uric acid, acetaminophen, dopamine, and glucose are much weaker. This shows that the sensor can effectively detect H₂O₂ even in complex samples where high selectivity is needed.