有机无机复合介孔膜电化学传感器的研制
另外，本工作还进一步考察了该化学修饰电极对氧的电催化还原作用。实验结果表明：该化学修饰电极对氧具有很好的电催化还原能力，并具有良好的重现性和稳定性，因此，该化学修饰电极可用于氧的分析和检测。
关键词: 微波法；固相法；有机/无机复合介孔膜；2,9,16,23-四羧基钴酞菁；直接电化学；电催化4847
Study of Electrochemical Sensor Organic/inorganic Hybrid Mesoporous Membrane
Abstract: In this work, SBA-15 organic/inorganic hybrid mesoporous membrane was synthesized by employing the microwave-assisted method combined with solvent-extraction, as well as by using polycarbonate filtration membrane（PC）as the hard template and P123 as the soft template. Scanning electron microscopy (SEM) were used to characterize the morphology and structures of as-prepared membrane. The experimental result shows that one-dimensional silica rods and their arrays with 9μm in length and 200nm in diameter formed inside the channels of polycarbonate membrane. Those rods are mesoporous silica rods with hexagonal mesoporous structure and the mesopore size is 6.0nm. 2,9,16,23- Tetracarboxylic cobalt phthalocyanines were prepared by the reaction of trimellitic anhydride with urea and CoCl2•6H2O. Then, the direct electrochemistry of Phthalocynaines immobilized on organic/inorganic hybrid mesoporous membrane modified on a glassy carbon electrode（GCE）was studied. The CV results illuminate that Phthalocynaines existed on such a chemically modified electrode (CME) displayed irreversible reduction-behavior with reduction peak at the potential of -0.5V (vs. Ag/AgCl). The scan rate experiment shows that the potential of oxidation peak and reduction peak does not change with the scan rate. And the relationship of peak current and scan rate is completely proportional. All of above results indicate that the electrochemical reaction of 2,9,16,23- Tetracarboxylic cobalt phthalocyanine on such a chemically modified electrode is a surface-controlled process with a fast electron transfer.
Furthermore, it was found that there are well-defined electrocatalytic responses to the reduction of oxygen for such a CME, which can be used to develop a novel electrochemical-sensor for oxygen. The results demonstrate that the electrocatalytic response of such a CME presents good reproducibility and stability. Thus, such a chemically modified electrode can be applied into the analysis of oxygen peroxide.
KeyWords: microwave-assisted method; Solid-phase method; Organic/inorganic hybrid mesoporous membrane; 2,9,16,23-Tetracarboxylic cobalt phthalocyanine; Direct electrochemistry; Electrocatalysis
目录
1 绪论 5
1.1 酞菁化合物的结构特点及应用 5
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