Measurement of the diffusion coefficients of [Ru(NH3)6]3+ and [Ru(NH3)6]2+ in aqueous solution using microelectrode double potential step chronoamperometry

2011 ◽  
Vol 652 (1-2) ◽  
pp. 13-17 ◽  
Author(s):  
Yijun Wang ◽  
Juan G. Limon-Petersen ◽  
Richard G. Compton
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficients ◽  
Potential Step ◽  
Double Potential Step Chronoamperometry

Double potential step chronoamperometry at microdisk electrodes: simulating the case of unequal diffusion coefficients

2004 ◽  
Vol 571 (2) ◽  
pp. 211-221 ◽  
Author(s):  
Oleksiy V. Klymenko ◽  
Russell G. Evans ◽  
Christopher Hardacre ◽  
Irina B. Svir ◽  
Richard G. Compton
Keyword(s):  
Diffusion Coefficients ◽  
Potential Step ◽  
Double Potential Step Chronoamperometry

Investigation of molecular partitioning between non polar oil droplets and aqueous solution using double potential step chronoamperometry

2014 ◽  
Vol 16 (22) ◽  
pp. 10456-10463 ◽  
Author(s):  
Jonathan C. Newland ◽  
Patrick R. Unwin ◽  
Julie V. Macpherson
Keyword(s):  
Aqueous Solution ◽  
Oil Droplets ◽  
Factors Affecting ◽  
Potential Step ◽  
Solid Interface ◽  
Oil Water ◽  
Polar Oil ◽  
Double Potential Step Chronoamperometry

Factors affecting partitioning of an electrogenerated species, Br2 from Br−, into non-polar oil microdroplets at the oil–water–solid interface are investigated using double potential step chronoamperometry.

General analytical solution for a reversible i/t response to a double potential step at spherical electrodes in the absence/presence of amalgamation effects

1994 ◽  
Vol 72 (12) ◽  
pp. 2378-2387 ◽  
Author(s):  
A. Molina ◽  
C. Serna ◽  
R. Chicón ◽  
L. Camacho ◽  
J. J. Ruiz
Keyword(s):  
Charge Transfer ◽  
Diffusion Coefficients ◽  
Transfer Reaction ◽  
Mercury Electrode ◽  
Charge Transfer Reaction ◽  
Electrolytic Solution ◽  
Potential Step ◽  
Spherical Electrode ◽  
Dropping Mercury Electrode ◽  
Double Potential Step Chronoamperometry

The general rigorous theory corresponding to double potential step chronoamperometry for a reversible charge transfer reaction in a spherical electrode whose area increases with tz, where z ≥ 0, is presented. The static mercury drop electrode (z = 0) and the dropping mercury electrode (z = 2/3) are addressed specifically. The explicit equations for the current versus time response assuming unequal diffusion coefficients for the oxidized and reduced species are valid when the product is soluble in both the electrolytic solution and the electrode. Comparisons with previous general treatments in the literature are made. The theory is applied to the detection of amalgamation in RP and DNP techniques.Moreover, in this work we show the origin of errors appearing in some general treatments in the literature, these errors lead to physically meaningless results when amalgamation takes place.

Rotating disc electrodes: the theory of chronoamperometry and its use in mechanistic investigations

1988 ◽  
Vol 418 (1854) ◽  
pp. 113-154 ◽  
Keyword(s):  
Diffusion Coefficients ◽  
Reaction Mechanisms ◽  
Electrode Reaction ◽  
Rotating Disc ◽  
Potential Step ◽  
Wide Range ◽  
Mechanistic Investigations ◽  
Disc Electrodes ◽  
Theoretical Results ◽  
Computational Strategy

A general computational strategy is presented for the calculation of the chronoamperometric responses arising from potential-step experiments at rotating disc electrodes. The method is applicable to a wide range of electrode reaction mechanisms and theoretical results are given for single- and double-potential-step experiments for ECE, DISP1, DISP2, EC' and CE reactions. For the last, the treatment is extended to cover the case where reactants have grossly unequal diffusion coefficients. Steadystate behaviour is also deduced. The extent to which the various mechanistic pathways can be distinguished is identified and the necessary experiments defined.

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