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Investigation of Reactive Blue 81 Electrooxidation at Various Electrode Materials - Kinetic Parameter

Chrzescijanska E., Kusmierek E., Nawrat G.

Polish Journal of Chemistry

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2009

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Vol. 83, nr 6

1115-1126

EN

The electrochemical oxidation of Reactive Blue 81 proceeds easier at titanium electrodes covered with titanium and ruthenium oxides than at a platinum electrode. This process proceeds at both types of electrodes in at least one electrode step before potentials reach the value at which the oxygen evolution starts and is irreversible. Ruthenium oxide has electrocatalytic properties and titanium oxides has photocatalytic properties. An increase in the content of RuO2 at the surface of a titanium electrode causes electrooxidation of Reactive Blue 81 to proceed easier and quicker. The substrate is also reduced in at least two electrode steps at potentials higher than the potentials at which the hydrogen evolution starts. The reduction is also irreversible. An increase in pH of the dye solution facilitates the electrooxidation of Reactive Blue 81.

2

A multisensor for electrochemical sequential autonomous automatic measurements

Navratil T., Yosypchuk B., Barek J.

Chemia Analityczna

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2009

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Vol. 54, No. 1

3-17

EN

A newly constructed electrochemical multisensor containing 8 different sensors (5 different solid amalgam electrodes, platinum, gold and glassy carbon electrodes) for analysis of small sample volumes (5-200 μL) was developed. The multisensor was connected to the specially constructed and developed electrochemical multichannel device for sequential autonomous measurements. This device consisted of a computer (PC or notebook), an interface card, and a control box; it was able to control up to 8 sensors (i.e. electrode sets) in a selected sequence, in which each sensor could utilize different detection mode (e.g. DCV, DPV, coulometry, chronopotentiometry, square-wave voltammetry) and operate at different parameters. The analysis of a mixture of ferrocene and nucleic acid bases: adeninę and guanine was used to demonstrate the possibilities of this device.

PL

Opracowano nowy sensor składający się z 8 elektrod, w tym 5 ze stałego amalgamatu i po jednej z platyny, ztota i węgla szklistego. Sensor jest przewidziany do analiz próbek o malej objętości (5-200 μL). Sensor zosta) podłączony do specjalnie skonstruowanego, wielokanałowego urządzenia elektrochemicznego, które umożliwiło sekwencyjne, niezależne pomiary na wszystkich elektrodach. Urządzenie składało się z komputera (PC lub notebook), karty interfejsowej i części kontrolnej. Każdąelektrodę można było użyć w połączeniu z wybraną techniką elektrochemiczną (np. woltamperometria stałoprądowa, woltampe-rometria pulsowa różnicowa, woltamperometria prostokątnej fali, kulometria i chronoam-perometria). W celu zademonstrowania możliwości nowego układu przeprowadzono analizę mieszaniny ferocenu, adenicy i guaniny.

3

Admittance Analysis at Electrochemical Quartz Crystal Microbalance in Fast Dynamic Measurements

Plausinaitis D., Raudonis R., Daujotis V.

Polish Journal of Chemistry

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2000

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Vol. 74, nr 4

559-565

EN

A method is proposed for measuring admittance in cyclic voltammetry at an electrochemical quartz crystal microbalance. The main idea of this method is to measure admittance spectrum in a series of repetitive potential cycles by using one perturbing frequency in one potential cycle.

4

EQCM study of charge transfer during cadmium underpotential deposition on platinum electrodes from acidic aqueous solutions

Daujotis V.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 11

2432-2439

EN

The potential dependence of the formal partial charge number for cadmium(II) underpotential deposition (upd) on platinum was obtained, using electrochemistry and piezoelectric microgravimetry. The comparison of this dependence with the formal partial charge number, calculated on the basis of earlier proposed mechanism of cadmium(II) upd, supports this mechanism, according to it the electrosorption valency for the cadmium(II) adsorption on platinum equals 1 and 2.