Xu Xiaomi, Weber Stephen G
Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260.
J Electroanal Chem (Lausanne). 2009 May 15;630(1-2):75-80. doi: 10.1016/j.jelechem.2009.03.002.
Carbon fiber/epoxy composite materials, which are manufactured using the pultrusion process, are commercially available in various shapes and sizes at very low cost. Here we demonstrate the application of such a material as an electrochemical detector in a flow system. Cyclic voltammetry shows that the material's electrochemical behavior resembles that of glassy carbon. Using tube and rod composites, we successfully fabricated a ring-disk electrode with a 20 μm gap between the ring and the disk. The narrow gap is favorable for mass transfer in the generator-collector experiment. This composite ring-disk electrode is assembled in a thin-layer radial-flow cell and used as an electrochemical detector. The disk electrode, placed directly opposite to the flow inlet, is operated as a generator electrode with the ring electrode being a collector. The high collection efficiency on the ring electrode (0.8 for a chemically reversible species) enhances the detection selectivity.
采用拉挤成型工艺制造的碳纤维/环氧树脂复合材料，能以非常低的成本批量生产各种形状和尺寸的产品。在此，我们展示了这种材料在流动系统中作为电化学检测器的应用。循环伏安法表明，该材料的电化学行为与玻碳相似。利用管状和棒状复合材料，我们成功制造出一种环盘电极，其环与盘之间的间隙为20μm。这种窄间隙有利于在发生器 - 收集器实验中的传质。这种复合环盘电极被组装在一个薄层径向流动池中，并用作电化学检测器。直接与流体入口相对放置的盘电极作为发生器电极，而环电极作为收集器。环电极上的高收集效率（对于化学可逆物质为0.8）提高了检测选择性。
