电化学发光
亚硫酸盐
化学
光化学
无机化学
激发态
极化(电化学)
硫黄
阳极
离子
多硫化物
电极
电解质
有机化学
物理化学
核物理学
物理
作者
Yongqiang Dong,Congqiang Chen,Jia‐Ming Lin,Nana Zhou,Yuwu Chi,Guonan Chen
出处
期刊:Carbon
[Elsevier]
日期:2013-01-16
卷期号:56: 12-17
被引量:106
标识
DOI:10.1016/j.carbon.2012.12.086
摘要
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 +1.400 V, SO32- is firstly electrochemically oxidized to sulfur trioxide anion free radical (SO3-) in the anodic polarization process. Then the electrogenerated SO3- is involved in a three-step auto-catalytic reaction in the presence of dissolved oxygen, producing sulfate radical (SO4-). In the subsequent cathodic polarization process, CQDs are electrochemically reduced to negatively charged CQDs (C−). Finally, the electrogenerated C− species react with the SO4- to form excited-state CQDs (C∗), emitting light (575 nm) when they come back to their ground states.
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