Fig. 2. (A) Continuous ECL responses of the GQDs–K2S2O8–Na2SO3 system during a continuous potential scan between –1.2 and 1.5 V at a scan rate of 0.2 V s–1 (B) ECL-time profiles of the GQDs–K2S2O8–Na2SO3 system in air-saturated (blue curve), nitrogen-saturated (red curve) and oxygen-saturated (black curve) 0.1 M PBS (pH 7.4) (scan potential: –1.2 to 1.0 V).
