含金纳米粒子聚(3,4-乙烯二氧噻吩)涂层上电子转移的电化学阻抗谱研究

Stelian Lupu
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摘要

利用电化学阻抗谱(EIS)表征了含金纳米粒子的氧化还原偶对氰化铁-铁氰化物、二茂铁、二茂铁-乙醇和聚(3,4-乙烯二氧噻吩)(PEDOT)导电聚合物中的电子转移。在含有10 -2 M EDOT和10 -1 M liclo4作为支撑电解质的水溶液中,通过恒流电化学聚合将PEDOT涂层沉积在铂(Pt)和玻碳(GC)电极上。通过在Pt/PEDOT和GC/PEDOT修饰电极上滴滴沉积Au纳米粒子,制备了PEDOT-Au纳米粒子复合镀层。在含有多种氧化还原探针的10 -1 M liclo4溶液中,采用EIS和循环伏安法(CV)研究了纯PEDOT和PEDOT- au纳米颗粒复合涂层。在氧化还原探针的形式氧化还原电位处记录阻抗谱。根据EIS数据计算了电荷转移电阻(rct)、溶液电阻(R s)、交换电流密度(i 0)、标准速率常数(k 0)和双层电容(cdl)。
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Electrochemical impedance spectroscopy study of electron transfer at poly(3,4-ethylenedioxythiophene) containing gold nanoparticles coating
Electrochemical impedance spectroscopy (EIS) was used for characterization of electron transfer in various redox probes, such as the redox couple ferrocyanide-ferricyanide, ferrocene, ferrocenemethanol, and the poly(3,4-ethylenedioxythiophene) (PEDOT) conducting polymer containing gold nanoparticles. The PEDOT coating was deposited onto platinum (Pt) and glassy carbon (GC) electrodes by galvanostatic electrochemical polymerization from an aqueous solution containing 10 –2 M EDOT and 10 –1 M LiClO 4 as supporting electrolyte. The PEDOT-Au nanoparticles composite coating was prepared by droplet deposition of Au nanoparticles on top of the Pt/PEDOT and GC/PEDOT modified electrodes. The pure PEDOT and PEDOT-Au nanoparticles composite coatings were investigated using EIS and cyclic voltammetry (CV) in 10 –1 M LiClO 4 solution containing various redox probes. The impedance spectra were recorded at the formal redox potential of the redox probes. The charge transfer resistance ( R ct ), solution resistance ( R s ), exchange current density ( i 0 ), standard rate constant ( k 0 ), and double-layer capacitance ( C dl ) were calculated from the EIS data.
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