Advances in Electrochemical Science and Engineering

Gerischert, D. M. Kolb, C. W. Tobiast ISSN 0938-5193 Volume 1 with contributions from Brusic, J. Horkans, D. J. Barclay, D.-T. Chin, G. P. Evans, T. Iwasita-Vielstich, R. K tz, J. Winnick 1990. Hardcover. Sold Volume 2 with contributions from C. Deslouis, B. Tribollet, A. Hammou, G. L. Richmond, S. Trasatti 1992. Hardcover. ISBN 3-527-28273-4 Volume 3 with contributions from W. P. Gomes, H. H. Goossens, Y. Okinaka, T. Osaka, J. O. Dukovic, H. Lehmkuhl, K. Mehler, U....

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Gold polycrystalline surface with copper-gold alloy crystallites grown by performing cycles of copper electrodeposition and dissolution, (a) After first cycle E 400 mV, Et 442 mV, d 44 nm, It 1.8 nA. (b) After second cycle. In-situ images d 42 nm, It 2.1 nA. Electrolyte 0.001 M CuS04 and 0.05 M H2S04 in Millipore water, E 400 mV, Et 442 mV. Fig. 5. Gold polycrystalline surface with copper-gold alloy crystallites grown by performing cycles of copper electrodeposition and dissolution, (a)...

Microelectrochemical equipment

For all microelectrochemical experiments a metallurgical microscope was used. The sample was mounted on the microscope stage and the electrochemiqal microcell was fixed at the revolving nosepiece like an ordinary objective. This set-up enabled selection of an interesting area before the measurement and allowed a visible control of the investigated area after the measurement. The electrochemical microcell basically consisted of a glass microelectrode with the tip grounded (tip diameter 2-1000...

The growth and the surface properties of polypyrrole on single crystal graphite electrodes as studied by insitu

3 Results and discussion 152 Summary. The growth of polypyrrole (PPy) films on highly oriented pyrolytic graphite (HOPG) electrodes is investigated by in-situ electrochemical scanning tunneling microscopy (STM) and in-situ atomic force microscopy (AFM) both applied in modified electrochemical cells. The PPy film formation at electrodes is studied in aqueous solutions with and without phosphate buffer in the range of pH 5 and pH 7 and with toluene-4-sulfonic acid (tosylate) as supporting...

References

Kopatzki, R.Q. Hwang, J. Schr der, J. Vrijmoeth, R.J. Behm, Ber. Bunsenges. Phys. Chem. 97, 522 (1993). 2 J. Schneider, D.M. Kolb, Surf. Sei. 193, 579 (1988). 3 D.M. Kolb, in Frontiers in Electrochemistry, Vol. 2. Structure of Electrified Interfaced, J. Lipkowski, R.N. Ross (Eds.),VCH, New York, 1993, p. 65. 4 X. Gao, A. Hamelin, M.J. Weaver, Phys. Rev. Lett 67,618 (1991). 5 X. Gao, G.J. Edens, A. Hamelin, M.J. Weaver, Surf. Sei. 296, 333 (1993). 6 X. Gao, A....

A2

Vnltammograin after 1000 s polarization transformation rates that were independent of the step densities, whereas a strong dependence of the rates of the step densities was found at high coverages, corresponding to the conditions of the STM studies described above. The measurements were related to kinetic site exchange models including surface inhomogeneities at low adsorbate coverages, and choosing a one-dimensional diffusion model without consideration of surface inhomogeneities for high...

SPM equipment

The STM AFM unit (Unversial SPC 400 SPM, Park Scifentific Instruments) consisted of an electronic unit which provided both the scan control for scanning the tip over the surface and an electronic feedback loop maintaining a constant working distance between tip sample. Additionally a four-electrode bi-potentiostat that was connected to the control unit was capable of setting the potentials of both tip and substrate independently. This system allowed minimization of the electrochemical current...

Results And Discussion 31 Electrocapillary Curves

The electrocapillary curve of a solid metal electrode is more difficult to measure than that of a liquid electrode, because of problems of surface cleanliness. The most widely used approach has been the bending-beam method, which was originally developed by Fredlein et al. 28 using large samples. More recently Raiteri and Butt 29 have used gold electrodes deposited on an AFM cantilever to record electrocapillary curves. As a calibration of our instrument we have recorded electrocapillary curves...

Topographic Changes during Silver Electrodissolution in Aqueous 1 M HCIO4

Topographic changes occur at the terrace domain of a silver single crystal immersed in aqueous 1 M perchloric acid at 298 K, and held at constant electrodissolution current density j and temperature. These changes can be followed by in-situ STM sequential imaging 25 , At low values of j j lt 15 aA cm2 silver electrodissolution proceeds at step edges Fig. 4 without roughening Fig. 5 . In this case, the dynamic scaling analysis of STM profiles results in 0, a figure which is consistent with a...

MP Soriaga K Itaya JL Stickney

3 Results and discussion 269 3.1 Adsorbate-catalyzed dissolution Pd l 11 - V3 x V3 R30 -I 269 3.2 Electrochemical atomic layer epitaxy Se on Au 100 272 Summary. The development of in-situ scanning tunneling microscopy STM has opened new avenues of research in electrochemical surface science. By itself, this nanometer-scale structural tool cannot be regarded as a panacea for the many problems that confront researchers in the interfacial sciences. However, when employed in tandem with other...

The Dynamic Scaling Theory

The concept of scaling was introduced in the field by Family and Vicsek in 1985 10 to provide a framework for understanding fractal-like topologies of nonequilibrium surfaces. The dynamic scaling theory describes the development of a contour .Drop 2, where Drop is the topological dimension , on a flat surface of size L on the x-axis at time t 0 Fig. 1 , and roughness surface growth proceeds in a single direction normal to L z-axis increasing in height, h, without overhangings. The instantaneous...