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Owing to the cathodic reaction rate influencing the anodic reaction rate, Au nanoparticles were electrodeposited on the cathode surface of the ITO BPE, which not only meliorated oxygen reduction but also further enhanced the ECL intensity of luminol. Under optimal experiments, an ECL immunosensor for detecting CYFRA 21-1 with a wider linear range from 0.0075 to 50 ng mL-1 and a detection limit of 1.89 pg mL-1 (S/N = 3) was obtained.In this work, we present a comprehensive comparison of time-of-flight secondary ion mass spectrometry (TOF