| 聚苯胺(PAn)和聚吡咯(PPy)膜电极对Hg(Ⅰ),Sn(Ⅱ)氧化的电催化行为 |
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| 引用本文： | 吴婉群,罗维忠.聚苯胺(PAn)和聚吡咯(PPy)膜电极对Hg(Ⅰ),Sn(Ⅱ)氧化的电催化行为[J].西南师范大学学报(自然科学版),1993(4). |
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| 作者姓名： | 吴婉群 罗维忠 |
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| 作者单位： | 西南师范大学化学系 重庆630715
(吴婉群)，西南师范大学化学系 重庆630715(罗维忠) |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 聚苯胺(PAn)和聚吡咯(PPy)膜电极对Hg(Ⅰ),Sn(Ⅱ)的氧化的电催化作用以循环伏安法(CV)进行了研究.在0.3mol·dm~(-3)HNO_3中PAn膜电极对Hg(Ⅰ)的氧化在0.445V处有一个非常尖的氧化峰,其峰电流I_(pa)的值为同样条件下Hg(Ⅰ)在光滑裸铂电极上峰电流值的5倍以上.PPy膜电极对Hg(Ⅰ)的电催化氧化有相似的结果,在0.49V处有一个尖峰,这是Hg(Ⅰ)在PPy上的氧化峰,I_(pa)值为在裸铂电极上的数倍.这些结果都说明PAn和PPy对Hg(Ⅰ)的氧化有明显的电催化作用.与此相似,PAn,PPy膜对Sn(Ⅱ)的氧化有类似的效果.PAn与PPy对Hg(Ⅰ)和Sn(Ⅱ)的氧化,其峰电流I_(pa)与扫描速率v的平方根成直线关系,这说明Hg_2~(2+)和Sn~(2+)离子在这两种导电聚合物膜电极上的电极过程受膜内扩散控制.
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| 关 键 词： | 聚苯胺 聚吡咯 电催化 循环伏安法 |
THE ELECTROCATALYTIC BEHAVIOR OF POLYANILINE AND POLYPYRROLE FILM ELECTRODES FOR Hg( I ) AND Sn( II ) |
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| Wu Wanqun Luo Weizhong.THE ELECTROCATALYTIC BEHAVIOR OF POLYANILINE AND POLYPYRROLE FILM ELECTRODES FOR Hg( I ) AND Sn( II )[J].Journal of Southwest China Normal University(Natural Science),1993(4). |
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| Authors: | Wu Wanqun Luo Weizhong |
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| Abstract: | The electrocatalytic behavior of polyaniline (PAn) and polypyrrole (PPy) for oxidation of Hg ( I ) and Sn ( II ) was investigated by the cyclic voltammetry. A sharp peak appeared at 0. 445V and 0. 49V respectively for oxidation of Hg ( I ) with PAn and PPy. Although the peak potential moved a little, the peak currents 7^ were several times of that of the naked platinum electrode. This indicated that the PAn and PPy film electrodes have electrocatalytic activity for electrodereaction involing oxidtion of Hg ( I ). The electrocatalytic activities of PAn and PPy for oxidation of Sn ( II ) were obvious. The relationship between the !? and the square root of the potential sweep rate was linear, which indicates that the electrode processes on the PAn and PPy were controlled by diffussion. |
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| Keywords: | polyaniline polypyrrole electrocatalysis cyclic voltammery |
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