论文部分内容阅读
提出一种使用循环伏安(CV)扫描电位下的电致化学发光(ECL)研究方法,在自制的仪器系统上同时进行i-E和I-E测量,获得对应的CV和电位分辨的电致化学发光(PRECL)曲线。首先发现碱性鲁米诺体系在玻碳电极(GCE)上呈现2个阳极发光峰(在0.32V、0.39Vvs.Ag)和1个阴极发光峰(在—0.62V),在P_t电极上呈现2个阳极发光峰(在0.49V、0.75V)。结合CV、一阶微分伏安、Cl~-离子影响等分析,作者提出了5通道PRECL机理假设:(1)鲁米诺在GCE上氧化发光;(2)H_2O_2促进鲁米诺在GCE电极上氧化发光;(3)O_2在GCE上阴极发生的H_2O_2氧化鲁米诺发光;(4)P_t电极上电生的P_tO氧化鲁米诺发光;(5)P_t电极上电生的[O]氧化鲁米诺发光。
An ECL method using cyclic voltammetry (CV) scan potential was proposed to simultaneously measure iE and IE on a homemade instrumentation system to obtain the corresponding CV and potential resolved ECL PRECL) curve. First of all, it was found that alkaline luminol system showed two anodic luminescence peaks (at 0.32V, 0.39Vvs. Ag) and one cathodoluminescence peak (at -0.62V) on the glassy carbon electrode (GCE) 2 anodes luminescence peak (at 0.49V, 0.75V). Combined with CV, first-order differential voltammetry and Cl ~ - ion influence analysis, we propose a 5-channel PRECL mechanism hypothesis: (1) luminol is oxidized and luminescent at GCE; (2) H 2 O 2 promotes luminol at the GCE electrode Oxidation and luminescence; (3) Oxidation of luminol by H 2 O 2 generated by O 2 on the cathode of GCE; (4) P_tO oxidation of luminol by P_t electrode; (5) Oxidation of luminol at P_t electrode Mino glows.