碱性水溶液中的单线态氧电致化学发光

摘要

Light emission was observed in a simple aqueous solution containing an alkaline salt such as K2HPO4, Na2CO3 or Na2B4O7 when a double-step potential was applied to the electrode. The light emitter was identified to be singlet oxygen by both spectral features and its responses to singlet oxygen quenchers and enhancers. The Haber-Weiss reaction of hydrogen peroxide electrogenerated from dissolved oxygen with superoxide anion formed by the electro-oxidation of hydrogen peroxide was validated to be responsible for this light emission.%研究发现:当在碱性无机盐(如K2HPO4,Na2CO3或Na2 B4O7)水溶液中施加适当调制的双脉冲电信号时,可以在电极表面观察到发光.通过研究发光光谱以及各种单线态氧抑制/增强荆对化学发光强度的影响规律,确定该体系的发光体为单线态氧.其发光机理为负电位下溶解氧被电还原为过氧化氢,在随后的正脉冲下产生超氧基阴离子,两者以Haber-Weiss反应机理生成单线态氧并产生光发射.