The effect of polyaniline morphology on hydroquinone/quinone redox reaction
The effect of polyaniline morphology on hydroquinone/quinone redox reaction
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DOI：
10.1016/s0013-4686(01)00491-1
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发表时间：
2001-05
影响因子：
6.6
通讯作者：
L. Duić;S. Grigić
中科院分区：
文献类型：
--
作者：
L. Duić;S. Grigić
研究了聚苯胺（PANI）对氢醌/醌（H2Q/Q）氧化还原反应的催化作用，研究了不同形态的聚苯胺（PANI）在合成过程中依赖于反离子的催化作用。结果表明，聚苯胺降低了H2Q/Q反应电位和循环伏安法测得的电位差ΔEp。结果表明，ΔEpdoes的减小不依赖于PANI层厚度的增加，paniso4和PANICl电极的情况没有差异。与pt电极相比，PANI循环伏安图和Ilimin旋转圆盘电极（RDE）测量的ipv值增加，可以解释为PANI电极的实际表面积增加，paniso4和PANICl的差异是由于不同的形貌。一般来说，PANI电极上的氧化还原反应可以用H2Q分子在EM2+中心的特异性吸附来解释。RDE测量得到的倾斜电流平台可以解释为还原PANI （LE）到氧化形式（EM2+）的缓慢重组过程，在高浓度H2Q的存在下，这个过程成为整个反应的速率决定步骤。
The catalytic effect of polyaniline (PANI) on the hydroquinone/quinone (H2Q/Q) redox reaction, has been investigated with respect to different morphologies which are known to depend on the counter-ions during the synthesis. It has been established that PANI lowers the H2Q/Q reaction potential, as well as the potential difference, ΔEp, obtained by cyclic voltammetry. It is shown that the decrease in ΔEpdoes not depend on the increase in the thickness of the PANI layer, and there is no difference in the case of PANISO4and PANICl electrode. The increase in the Ipvalues in the cyclic voltammograms of PANI, as well as in Ilimin rotating disc electrodes (RDE) measurements, compared to Pt-electrodes, is explained by the increase in the real surface area of PANI electrodes, and the difference in PANISO4and PANICl by the different morphologies. In general, the redox reaction on PANI electrodes is explained by the specific adsorption of H2Q molecules onto EM2+centres. The inclined current plateau obtained by RDE measurements is explained by the slow process in the recombination of the reduced PANI (LE) to the oxidised form (EM2+) which in the presence of high concentrations of H2Q becomes the rate-determining step in the overall reaction.