An efficient oxidation at photofunctional interface of phthalocyanine in combination with fullerene
An efficient oxidation at photofunctional interface of phthalocyanine in combination with fullerene
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DOI：
10.1016/j.jelechem.2006.09.001
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发表时间：
2007-01-01
影响因子：
4.5
通讯作者：
Norimatsu, Takayoshi
中科院分区：
文献类型：
--
作者：
Abe, Toshiyuki;Nagai, Keiji;Norimatsu, Takayoshi
当不含金属的酞菁（H2 PC，一种p型半导体）与富勒烯（C-60，一种n型半导体）组合使用时，证实了C-60/H2 Pc的双层膜在水相中用作新型且有效的光阳极。巯基的光诱导氧化发生在H_2Pc/水界面上，沿着空穴通过H，Pc层的传导，并基于双层膜的电子物理特性。典型的光电极特性涉及在初始阶段在照明下（在恒电位条件下）发生的瞬态光电流，随后光电流达到稳态。这种瞬态光电化学特性在H（2）Pe/水界面上的硫醇浓度进行了研究，从它被注意到，无论是初始尖峰光电流和稳态光电流显示饱和在较高的浓度。与光电极动力学的分析进行了假设一个吸附步骤之前的限速电荷转移步骤。在分析中，方程被应用到这样的光电流的基础上的朗缪尔吸附平衡。动力学分析还揭示了硫醇氧化的动力学为约。在本发明的双层中比在空穴光导酞菁的单层中快20倍。这表明，酞菁在有机双层作为一个有效的光功能界面在水相中。(c)2006 Elsevier B. V.保留所有权利。
When metal-free phthalocyanine (H2PC, a p-type semiconductor) was used in combination with fullerene (C-60, an n-type semiconductor), it was confirmed that the bilayer film of C-60/H2Pc functioned as a novel and efficient photoanode in the water phase. The photoinduced oxidation of thiol occurred at the H2Pc/water interface along with hole conduction through the H,Pc layer, and based on the photophysical character of the bilayer. The typical photoelectrode characteristic involved a transient photocurrent occurring in the initial stage under illumination (under potentiostatic conditions), following which the photocurrent reached a steady-state. Such transient photoelectrochemical features at the H(2)Pe/water interface were investigated with respect to the thiol concentration, from which it was noted that both the initial spiky photocurrents and the steady-state photocurrents showed saturation at higher concentrations. An analysis with photoelectrode kinetics was performed by assuming an adsorption step prior to a rate-limiting charge transfer step. In the analysis, equations were applied to such photocurrents based on the Langmuir adsorption equilibrium. Kinetic analysis also revealed the kinetics for the thiol oxidation to be ca. 20 times faster in the present bilayer than that in a single layer of a hole-photoconducting phthalocyanine. This showed that the phthalocyanine in the organic bilayer works as an efficient photofunctional interface in the water phase. (c) 2006 Elsevier B.V. All rights reserved.