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研究了铂电极的不同预极化处理过程对碱性鲁米诺阳极电致化学发光(ECL)和阳极极化曲线的影响,发现在碱性含氧溶液中预还原处理的铂电极可增强0.22V(vs.SCE)处发光峰强度,且催化产生1.07V(vs.SCE)附近氧气析出过程并伴随产生明显的ECL发光峰;在酸性溶液中预处理电极可抑制这些活性.给出了催化氧气析出的可能作用机理:在碱性溶液中溶解氧还原生成了吸附在铂电极表面的(OH~-)_(ads),从而加快了氧气的析出过程.同时给出了在碱性含氧溶液中预还原的铂电极上两个可能的ECL反应通道:(1)在0.22V鲁米诺阴离子氧化为鲁米诺自由基,然后与溶解氧反应而发光;(2)1.07V处析出的新鲜氧与鲁米诺阴离子反应而发光.
The effects of different pre-polarization processes of platinum electrode on alkaline luminol anodic electrochemiluminescence (ECL) and anodic polarization curves were investigated. It was found that pre-reduction of platinum electrode in alkaline oxygen-containing solution enhanced 0.22 V (vs.SCE), and catalyzed the evolution of oxygen near 1.07V (vs.SCE) accompanied by a significant ECL emission peak.It was shown that the pretreatment of the electrode in acidic solution inhibited these activities.The catalytic Possible Mechanism of Oxygen Precipitation: Dissolved oxygen reduction in alkaline solution results in the formation of (OH ~ -) _ (ads) adsorbed on the surface of the platinum electrode, thus accelerating the oxygen evolution process. In the meantime, The two possible ECL reaction channels on the prereduced platinum electrode in solution are: (1) the luminol anion is oxidized to luminol free radicals at 0.22V and then reacts with dissolved oxygen to emit light; (2) Fresh oxygen and luminol anion reaction and light.