Electrochemical Behavior of Electrodes Modified with π-Conjugated Polymers in 0.5 M H2SO4 (aq) and 1 M KOH (aq) Electrolytes
Electrochemical Behavior of Electrodes Modified with π-Conjugated Polymers in 0.5 M H2SO4 (aq) and 1 M KOH (aq) Electrolytes
复制标题
π-共轭聚合物修饰的电极在 0.5 M H2SO4（水溶液）和 1 M KOH（水溶液）电解质中的电化学行为
DOI：
10.1246/bcsj.69.3461
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发表时间：
1996
影响因子：
4
通讯作者：
O. Ohashi
中科院分区：
文献类型：
--
作者：
Takakazu Yamamoto;Takehiro Matsuzaki;Akiyuki Minetomo;Y. Kawazu;O. Ohashi
制备了10种π共轭聚合物修饰的铂电极。这些聚合物包括聚（吡啶-2,5-二基）吡啶、聚（2,2 ' -联吡啶-5,5 ' -二基）吡啶、聚（3-辛基噻吩-2,5-二基）P3OcTh和聚（6-己基吡啶-2,5-二基）P6HexPy。在0.5 M H2SO4 （aq）中，PPy和PBpy薄膜表现为良好的H+输运材料。用聚合物修饰电极的log i vs. V曲线在10−5.5-10−2 a cm−2的电流密度区域给出了线性曲线。这条线的斜率β = dV/d（log i）取决于聚合物的种类。亲水性PPy和PBpy的β值为3.2 × 10−2 V，而具有长烷基链的疏水性P3OcTh和P6HexPy的β值较大，为4.5 × 10−2 V。在室温下，从极限电流来看，在PPy、PBpy和聚（喹啉-2,6-二基）P（2,6- q）薄膜中H+的扩散系数估计大于10−7 cm2 s−1。P（2,6- q）修饰Pt电极的i-V曲线显示出很强的pH依赖性，反映了聚合物随pH变化的化学变化。
Plantinum electrodes modified with 10 kinds of π-conjugated polymers have been prepared. These polymers include poly(pyridine-2,5-diyl) PPy, poly(2,2′-bipyridine-5,5′-diyl) PBpy, poly(3-octylthiophene-2,5-diyl) P3OcTh, and poly(6-hexylpyridine-2,5-diyl) P6HexPy. Films of PPy and PBpy behave as good H+-transporting materials in 0.5 M H2SO4 (aq). Plots of log i vs. V for electrodes modified with the polymers give linear lines in a current density region of 10−5.5—10−2 A cm−2. The slope of the line, β = dV/d(log i), depends on the kind of the polymer. Hydrophilic PPy and PBpy give a β value of 3.2 × 10−2 V, while hydrophobic P3OcTh and P6HexPy with long alkyl chains give a larger β value of 4.5 × 10−2 V. Diffusion coefficients of H+ in films of PPy, PBpy, and poly(quinoline-2,6-diyl) P(2,6-Q) are estimated to be larger than 10−7 cm2 s−1 from limiting currents at room temperature. The i–V curve of a P(2,6-Q)-modified Pt electrode shows a strong pH-dependence reflecting a chemical change of the polymer with pH...