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A new electrochemiluminescence (ECL) system consisting of carbon quantum dots (CQDs) and sulfite SO32- has been reported. In the ECL system, SO32- is a new ECL coreactant that can significantly enhance the cathodic ECL signal of CQDs. When cycling the potential between −1.300 and +1.400V, SO32- is firstly electrochemically oxidized to sulfur trioxide anion free radical (SO3-) in the anodic polarization...
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