Electrodeposition electronically conducting polymer

An electronic conductive polymer was found by Strike al. as a support for platinum with a co-catalysts. The platinum particles were deposited on electrodeposited polypyrrole. 

Fig. 11.8. Current density as a function of rotation rate during growth of electrodeposited polypyrrole film at 0.550 ( ), 0.600 ( ), 0.650 (T), and 0.700 ( ) V. (Reprinted with permission from D. J. Fermin, M. Mostany, and B. Scharifker, Electronically Conducting Polymers Synthesis and Electrochemical Properties of Polypyrrole, Curr. Topics Electrochem. 2 132-136, 1993.)...

Different electron-conducting polymers (polyaniline, polypyrrole, polythiophene) are considered as convenient substrates for the electrodeposition of highly dispersed metal electrocatalysts. The preparation and the characterization of electronconducting polymers modified by noble metal nanoparticles are first discussed. Then, their catalytic activities are presented for many important electrochemical reactions related to fuel cells oxygen reduction, hydrogen oxidation, oxidation of Cl molecules (formic acid, formaldehyde, methanol, carbon monoxide), and electrooxidation of alcohols and polyols. 

DJi. Tallman, M.P. Dewald, C.K. Vang, G.G. Wallace, and G.P. Bierwagen, Electrodeposition of conducting polymers on active metals hy electron transfer mediation. Current Applied Physics, 4, 137 140 (2004). 

Conducting polymers capable of conducting ions or electrons are recently recognized as attractive candidates for biomedical appUcations owing to their electric field-controllable properties. A number of conducting polymers are commercially available or can be easily synthesized by methods such as electrodeposition on surfaces. The most commonly known conducting polymers and their electrical conductivity values are tabulated in Table 2.1. 

Conducting polymers have shown very promising results for application in gas sensors [107] and are currently used in electronic nose systems [108]. Because of the insolubility of these materials, chemoresistors are, in general, prepared by electrodeposition [107aj. Especially considering the limited reproducibility of this method, there remains a need for alternative methods for the preparation of chemoresistors [108bj. The authors of the paper presented a simple, wafer-scale fabrication method based on a commercial polyaniline product (experimental details explained in Ref. [106]). 

It is also possible to modify the deposited conducting polymer in order to change its electrical, optical and other properties. For instance, polyaniline film was modified by subsequent electrodeposition of diaminomethylbenzoate (Fig. 4.6) [10,129]. As a comparison of the spectrum of PANI— where the absorbance related to the delocalized electrons at A > 600 nm is clearly apparent— with the spectrum of the modified PANI shown in Fig. 4.7 reveals, the electronically conductive parent polymer can be transformed into a redox polymer. However, the electrochemical behavior, the color [10] and the conductivity [129] of the polymer during the modification procedure can easily be regulated, and so the required properties can be finely turned [10,129]. 

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