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研究了碱性鲁米诺溶液在多晶铂电极上的阳极电致化学发光(ECL)行为,观察到电极的预极化处理和溶解氧跟发光峰强度和峰形有直接关系.结合XPS谱图和Pt,Pt|S_(ads)修饰电极的循环伏安特性,给出了鲁米诺阳极ECL两个发光通道的可能反应机理:(1)鲁米诺阴离子在表面有新鲜Pt原子的电极上氧化生成鲁米诺自由基,然后迅速与溶液中的氧反应形成0.22V(vs.Ag)处的发光肩峰;(2)电极表面的铂氧化物能加速原子态氧的发生过程,并增大0.60V(Vs.Ag)附近ECL主峰的发光强度.
The ECL behavior of alkaline luminol solution on polycrystalline Pt electrode was investigated. It was observed that the electrode pre-polarization and DO were directly related to the intensity and peak shape of the emission peak. Combined with XPS spectra Cyclic voltammograms of Pt and Pt | S ads modified electrodes show the possible reaction mechanism of the two luminescent channels of luminol anode ECL: (1) Electrodes with luminol anion on the surface The oxidation of luminol generates luminol free radicals, and then rapidly react with the oxygen in the solution to form a luminescent shoulder at 0.22V (vs.Ag); (2) the platinum oxide on the electrode surface accelerates the generation of atomic oxygen and Increase the luminescence intensity of the main ECL near 0.60V (Vs.Ag).