Electrocatalysis on polymer-modified electrodes

Podlovchenko, B. I.; Андреев, В. Н.

doi:10.1070/rc2002v071n10abeh000672

Cited by 80 publications

(40 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Porous structure and high surface area of many conducting polymers favour their use as supporting material for the development of new electrocatalytic materials. Because of a relative high electric conductivity of some polymers, it is possible to transfer the electrons through polymer chains between the electrode and dispersed metal particles, where the electrocatalytic reaction occurs [25,26].…”

Section: -Introductionmentioning

confidence: 99%

Electrochemical deposition of platinum nanoparticles on different carbon supports and conducting polymers

et al. 2007

View full text Add to dashboard Cite

Electrodeposition of Pt nanoparticles under potentiostatic conditions was performed on several types of carbon electrode supports: a commercial macroporous carbon (which can be considered as a three-dimensional electrode), glassy carbon, graphite and conducting polymers (polyaniline and poly-o-aminophenol). The platinum nanoparticles were obtained by different Potential Step Deposition (PSD) methods in 5 mM H 2 PtCl 6 + 0.5 M H 2 SO 4 aqueous solutions. The effect of the final potential, time and number of steps on the quantity, distribution and size of the platinum nanoparticles deposited on the supports was analysed. The mechanism of the electrochemical deposition of platinum was studied by applying theoretical models found in the literature, being the progressive nucleation mechanism the most consistent with our results. In addition, the chemical state and morphology of the electrodeposited materials The prepared composites have been tested for the electro-oxidation of methanol. 2.-EXPERIMENTAL Preparation of the supportsDifferent carbon materials have been used to prepare the working electrodes for the platinum electrodeposition: macroporous carbon disc, glassy carbon and graphite.The macroporous carbon discs, which were cut from a macroporous carbon sheet (thickness = 0.3 mm, mean pore size 0.7 µm, exposed geometric area 2.91 cm 2 )provided by Poco Graphite (DFP-1) were washed in an ultrasonic bath with distilled water at room temperature for 30 minutes. The graphite (Ellor+35) and glassy carbon (CV25) were rods of 0.3 cm in diameter from Carbone Lorraine.In all cases, the materials were first treated with sandpaper, and were then polished with two different diamond suspensions (particle sizes 1 and 0.25 µm, respectively), and finally washed in an ultrasonic bath with ultrapure water for 5 minutes.The conducting polymers layers were electrochemically deposited on glassy carbon by cyclic voltammetry between 0.06 and 1.10V from a 0.1 M aniline or o -5 aminofenol in a supporting electrolyte of 0.5 M H 2 SO 4 at a scan rate of 50 mV s -1 .Although different expressions can be found for film thickness determination in literature, an EQCM experiment [27] was used to calculate film thickness from polymer peak voltammetric charge. Platinum electrodepositionThe electrodeposition of platinum particles on the different electrodes was performed in a conventional electrochemical cell of three electrodes at room temperature. All the reagents used were of analytical grade, and these and other materials were used without f urther purification. An EG&G potentiostat/galvanostat model 263A controlled by the program POWER SUITE was employed, so the values of current and time were monitored by a computer. For all the experiments the counterelectrode was a platinum wire. The reference electrode was a reversible hydrogen electrode (RHE), immersed in 0.5M H 2 SO 4 solution, which was connected to the working electrode compartment by a Luggin capillary.All solutions were prepared with high-purity water (resistivity =18 MΩ·...

show abstract

Section: -Introductionmentioning

confidence: 99%

Electrochemical deposition of platinum nanoparticles on different carbon supports and conducting polymers

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Making use of the notions developed in [1,[6][7][8][9][10][11][12][13], we can offer the following interpretation of the experimental data described in the foregoing.…”

Section: Resultsmentioning

confidence: 96%

“…One of the way to manufacture electrocatalytically active materials is to disperse microparticles of metals of the platinum group in polymeric materials [1,2]. Use of polyaniline as a polymer matrix [3] makes it possible to produce metal-catalyst particles of nanometer size and allows reactants to access electrocatalytic centers.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of the Nafion—polyaniline—palladium composite electrodes

Андреев

Zolotarevskii

2005

Russ J Electrochem

View full text Add to dashboard Cite

show abstract

“…The commercialization of FC is closely related to the search and development of new methods to generate efficient and available electrocatalysts, whose cost would be reduced by minimizing or even eliminating the noble metals and which would function for long periods in aqueous electrolytes in a broad pH range. The development of efficient catalysts for the reduction of oxygen is important not only for FC but also for advancing many other fields such as metal-air chemical power sources and electrosynthesis.Organic electroconducting polymers (ECP) and composites derived from these materials, which possess a broad range of unique properties, are among the new generation of functional materials attracting recent attention [1][2][3][4][5][6][7]. The redox activity and high electrical conductivity characteristic for ECP account for the special interest in the electrochemical aspects of using such materials, in particular, for the development of chemical power sources, energy transformation systems, supercondensers, electrochemical sensors, and electrocatalysts [2][3][4]7].…”

mentioning

confidence: 99%

Polyaniline/12-phosphotungstic acid/V2O5 nanocomposite and its platinum analog as oxygen reduction electrocatalysts

et al. 2007

View full text Add to dashboard Cite

A guest-host nanocomposite based on electroconducting polyaniline doped with 12-phosphotungstic acid and V 2 O 5 as well as its bifunctional analog containing not more than 5 mass % nanosized platinum were obtained. A study was carried out on the structure of these nanocomposites, their redox characteristics, and electrocatalytic activity in the reduction of oxygen. These nanocomposites were found to display catalytic properties in the electrochemical reduction of oxygen, while the presence of even a slight amount of nanosized platinum in the bifunctional composite leads to a significant increase in its electrocatalytic activity.A major precondition for conversion to hydrogen power is the development of reliable and inexpensive fuel cells (FC). Present FC are technically on the threshold of commercialization although their common use is being hindered by the high cost of the required equipment, primarily due to the use of platinum or other noble metal catalysts. In addition to the high cost of platinum, we should also note the limited supply of this metal and the high sensitivity of platinum catalysts toward traces of CO and sulfur compounds, which reduces the lifetime of FC. The commercialization of FC is closely related to the search and development of new methods to generate efficient and available electrocatalysts, whose cost would be reduced by minimizing or even eliminating the noble metals and which would function for long periods in aqueous electrolytes in a broad pH range. The development of efficient catalysts for the reduction of oxygen is important not only for FC but also for advancing many other fields such as metal-air chemical power sources and electrosynthesis.Organic electroconducting polymers (ECP) and composites derived from these materials, which possess a broad range of unique properties, are among the new generation of functional materials attracting recent attention [1][2][3][4][5][6][7]. The redox activity and high electrical conductivity characteristic for ECP account for the special interest in the electrochemical aspects of using such materials, in particular, for the development of chemical power sources, energy transformation systems, supercondensers, electrochemical sensors, and electrocatalysts [2][3][4]7]. Podlovchenko [4] and Barsukov [8] have discovered that polyaniline (PAN), polypyrrole, and other ECP may display electrocatalytic properties in the reduction of oxygen (RO), which is a precondition for the use of these materials in the development of electrocatalysts for this reaction. The use of specific dopants for PAN or polypyrrole, namely, Keggin heteropolyacids (HPA), has been proposed to raise the efficiency of polymer electrocatalysts for RO [9,10]. The molecular dispersion of catalytically active particles known as Keggin units in the ECP matrix, which is formed in this case, tends to enhance the catalytic activity of these materials in RO in comparison with ECP with the traditional dopants. 3340040-5760/07/4305-0334

show abstract

Electrocatalysis on polymer-modified electrodes

Cited by 80 publications

References 86 publications

Electrochemical deposition of platinum nanoparticles on different carbon supports and conducting polymers

Electrochemical deposition of platinum nanoparticles on different carbon supports and conducting polymers

Structure and properties of the Nafion—polyaniline—palladium composite electrodes

Polyaniline/12-phosphotungstic acid/V2O5 nanocomposite and its platinum analog as oxygen reduction electrocatalysts

Contact Info

Product

Resources

About