@article{jaworski_donten_stojek_osteryoung_1999, title={Conditions of strict voltammetric reversibility of the H+/H-2 couple at platinum electrodes}, volume={71}, ISSN={["1520-6882"]}, DOI={10.1021/ac9804240}, abstractNote={Cyclic voltammetric curves obtained at Pt electrodes for the hydrogen couple, H(+)/H(2), fit very well the Shuman theory, as corrected, for reversible electrode processes of other than 1:1 stoichiometry. Good agreement was obtained for acid concentrations in the millimolar range and for normal scan rates, which minimize the effect of the adsorption peaks. An error in Shuman's equation for potential is corrected. Voltammograms obtained at Pt microelectrodes fit well the theoretical simulated data.}, number={1}, journal={ANALYTICAL CHEMISTRY}, author={Jaworski, A and Donten, M and Stojek, Z and Osteryoung, JG}, year={1999}, month={Jan}, pages={243–246} } @article{jaworski_donten_stojek_osteryoung_1999, title={Migration and diffusion coupled with a fast preceding reaction. Voltammetry at a microelectrode}, volume={71}, ISSN={["0003-2700"]}, DOI={10.1021/ac980425s}, abstractNote={A mathematical model implemented by simulation is presented for voltammetry of a reversible couple that involves a fast preceding chemical reaction and mixed diffusional and migrational transport. The hydrogen couple, H(+)/H(2), fulfills the above criteria. For strong acids there is no preceding reaction, whereas for weak acids the preceding reaction is HA = H(+) + A(-). The computed voltammograms are compared with experimental voltammograms for the reduction of strong and weak acids at Pt microelectrodes with excess of and without supporting electrolyte. The key assumption in the calculations is that the flux of hydrogen ion is independent of the anion. This assumption is supported by the experimental fact that the wave heights in the absence of supporting electrolyte of several strong acids of equal concentration and with anions of various size are identical.}, number={1}, journal={ANALYTICAL CHEMISTRY}, author={Jaworski, A and Donten, M and Stojek, Z and Osteryoung, JG}, year={1999}, month={Jan}, pages={167–173} } @article{schmidt_donten_osteryoung_1997, title={Gold electrocrystallization on carbon and highly oriented pyrolytic graphite from concentrated solutions of LiCl}, volume={144}, ISSN={["0013-4651"]}, DOI={10.1149/1.1837736}, abstractNote={The early stages of the electrolytic deposition of gold on carbon electrodes from concentrated LiCl electrolytes have been investigated by voltammetry, chronoamperometry, and microscopy. The analysis of current-time transients according to existing theories indicates that this process occurs by multiple three-dimensional nucleation, followed by diffusion-controlled growth of nuclei. Diffusion coefficients calculated on the basis of nucleation theory were found to be higher than those Irom rotating disk experiments (RDE), suggesting that gold species are adsorbed on the electrode surface. Gold nucleation from 6 M LiCl cannot be classified as either instantaneous or progressive nucleation. The kinetic parameters for nucleation, aN o (nucleation rate) and N o (number density of active sites on the substrate surface), were estimated by using a general Poisson nucleation law. Both quantities were found to vary with potential and with concentration of gold. The potential dependence of the nucleation rate, aN o , was interpreted according to classical and atomistic theory. For low gold concentrations, where adsorption of AuCl or AuCl 3 might occur prior to nucleation, the number of atoms in the critical nucleus (N c ) was less than unity over the entire potential range analyzed. For high gold concentrations the number of atoms forming the critical nucleus depends on overpotential. In all solutions studied nucleation takes place on a limited number of active sites}, number={6}, journal={JOURNAL OF THE ELECTROCHEMICAL SOCIETY}, author={Schmidt, U and Donten, M and Osteryoung, JG}, year={1997}, month={Jun}, pages={2013–2021} }