Chronopotentiometer with Compensation for Extraneous Currents.

Shults, W.D.; Haga, F. E.; Mueller, Tobias; Jones, H. C.

doi:10.1021/ac60230a002

Cited by 25 publications

(9 citation statements)

References 2 publications

(1 reference statement)

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“…This is a very relevant aspect, because the derivative is very sensitive to the presence of noise, with a large tendency to produce oscillations. Indeed, there are some previous attempts in the literature to feedback the current with a quantity proportional to dE/dt by means of electronic circuits [34,35]. However, the instability of the resulting systems has been the main cause of failure of these attempts, which have been operative only in strongly damped systems with compulsory long time scales.…”

Section: Resultsmentioning

confidence: 99%

On the use of a real time application interface under Linux in the electrochemistry laboratory. Application to chronopotentiometry

Martı́nez-Ortiz

2005

Journal of Electroanalytical Chemistry

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Section: Resultsmentioning

confidence: 99%

On the use of a real time application interface under Linux in the electrochemistry laboratory. Application to chronopotentiometry

Martı́nez-Ortiz

2005

Journal of Electroanalytical Chemistry

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“…The classification of data and identification of subsets by methods such as factor analysis (8)(9)(10)(11)(12), principal components (13), and pattern recognition have been demonstrated.…”

Section: Appendix Bmentioning

confidence: 99%

“…The result is that the faradaic current is held constant to a good approximation. This method was introduced by Shults et al (11) and modernized by Bos and Van Dalen (8).…”

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confidence: 99%

Chronopotentiometry with programmed current

Chow¹,

Ewing²

1979

Anal. Chem.

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An instrument has been constructed for chronopotentiometry with current that varies as any selected power of time, tq, where gcan lie anywhere between 0.2 and 5.0. The ambiguity due to charging current is minimized by an initial brief operation at constant current. The determination of reducible species alone or in the presence of other species can be carried out to concentrations as low as 2.5 X M. Relative standard deviations are of the order of 1% at 5 X M.

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“…For example, background subtraction can subtract the residual current of the blank solution from the total current by adopting two duplicate cells, where it is assumed that the charging current is equal. 8 In the actual situation, however, the experimental conditions in the two cells are hard to be completely consistent. The other way to reduce the effect of the charging current is mathematical post-processing techniques, which try to separate the charging current from the faradaic current by mathematical calculations based on the different responses of the two currents.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the sensitivity of potential step voltammetry using chemometric resolution

Cai

Shao

2014

Analyst

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Enhancing the sensitivity of analytical methods by improving the signal quality is a universal goal in analytical chemistry. In analytical electrochemistry systems, the double layer charging current has been an obstacle to the accurate measurement of the faradaic current despite theoretical and experimental efforts. In this study, a method for sensitivity enhancement for potential step voltammetry is developed using chemometric resolution. Trilinear decomposition is used to extract the net faradaic current and double layer charging current directly from the data matrix of the decaying curves measured at different potentials. The feasibility of the method is proven using simulated data and further validated by two experimental datasets of diffusion and adsorption control reactions. Compared with the conventional approach that records the current data at a later pulse time, the voltammogram of the extracted net faradaic current is an ideal sigmoid curve with a horizontal baseline, even for the samples of very low concentration. More importantly, the analytical sensitivity can be greatly improved when the net faradaic current is used for quantitative determination.

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Chronopotentiometer with Compensation for Extraneous Currents.

Cited by 25 publications

References 2 publications

On the use of a real time application interface under Linux in the electrochemistry laboratory. Application to chronopotentiometry

On the use of a real time application interface under Linux in the electrochemistry laboratory. Application to chronopotentiometry

Chronopotentiometry with programmed current

Enhancing the sensitivity of potential step voltammetry using chemometric resolution

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