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聚吡咯H~+选择电极的性能研究

Performance of selective electrodes with hydrogen ion based on polypyrrole

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【作者】 郭兴蓬； 薛晓康； 李胜；

【Author】 Guo Xingpeng Xue Xiaokang Li ShengGuo Xingpeng Prof.; Dept. of Chemistry, Huazhong Unvi. of Sci. & Tech., Wuhan 430074, China .

【机构】 华中科技大学化学系； 华中科技大学化学系 湖北武汉430074； 湖北武汉430074； 湖北武汉430074；

【摘要】 采用电化学合成方法制备了聚吡咯H+选择电极.利用红外光谱探讨了掺杂不同阴离子聚吡咯膜的结构特征;探讨了聚吡咯电极在pH缓冲溶液中的阻抗谱特征及pH响应机理.比较了各种电极的能斯特斜率、转换系数和温度效应的差异,实验结果表明,未掺杂的聚吡咯(Pt/PPy)对H+响应的能斯特斜率、转换系数较掺杂TsO-离子[Pt/PPy(TsO-)]和HCO3-离子[Pt/PPy(HCO-3)]的要大.

【Abstract】 An electrode was fabricated to use as a selective electrode based on electrochemically polymerized polypyrole (PPy). The structure characteristics of PPy film doped with different anions and electrochemically synthesized on Pt was studied by infrared absorption spectroscopy. The characteristics of impedance spectroscopy and the mechanism of pH response for PPy doped and non-doped with T sO-or HCO- 3 were investigated. The difference among sub-Nernstian response, transform coefficient and temperature effect were studied. The results indicated that sub-Nernstain response slope and transform coefficient of Pt/PPy are larger than thoss of PPy doped with T sO-and HCO- 3.

【关键词】 聚吡咯； 红外光谱； H~+选择电极； 电化学阻抗；
【Key words】 polypyrrole； infrared absorption spectrum； hydrogen ion；