Ceramic carbon electrode modified with redox probe and salt solution in hydrophobic polar solvent
Ceramic carbon electrode modified with redox probe and salt solution in hydrophobic polar solvent
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疏水性极性溶剂中氧化还原探针和盐溶液修饰的陶瓷碳电极
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发表时间：
2004
期刊：
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通讯作者：
M. Opallo
中科院分区：
文献类型：
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作者：
G. Shul;M. Opallo
在疏水极性溶剂中制备了氧化还原探针和盐溶液修饰的陶瓷碳电极。以甲基三甲氧基硅烷基溶胶和石墨粉为原料，采用溶胶-凝胶法制备了均匀分散于疏水硅酸盐基体中的石墨粉电极。然后将其浸泡在硝基苯中高氯酸四丁基二茂铁溶液中。采用循环伏安法和计时安培法研究了电极在不同浓度的kno3溶液中的性能。电极对正电位的线性极化导致了由二茂丁基铁电氧化产生的峰状对称伏安图。峰值电流比有机相不含盐时的峰值电流大几倍。它还与氧化还原探针在有机相中的浓度和盐在水相中的浓度成正比，而峰中电位几乎不受这些因素的影响。讨论了产生这些影响的原因。
Ceramic carbon electrode modified with redox probe and salt solution in hydrophobic polar solvent was prepared and studied. The electrode consisting of graphite powder, homogeneously dispersed in hydrophobic silicate matrix, was prepared from the mixture ofmethyltrimethoxysilane based sol and graphite powder by sol-gel method. Then it was immersed in t-butylferrocene and tetrabutylammonium perchlorate solution in nitrobenzene. The electrode properties were investigated by cyclic voltammetry and chronoamperometry in KNO 3 solutions of different concentration. Linear polarization of the electrode towards positive potentials results in peak shaped symmetric voltammogram originating from electrooxidation of t-butylferrocene. The peak current is few times larger than that obtained when organic phase does not contain salt. It is also proportional to the concentration of the redox probe in organic phase and salt in aqueous phase, whereas the midpeak potential is almost not affected by these factors. The reasons of these effects are discussed.