By Richard C. Alkire, Dieter M. Kolb
Quantity 7 within the well-established sequence "Advances in Electrochemical technology and Engineering" covers - between others - very important issues on electrodeposition. As in all past volumes, the editors have succeeded in opting for hugely topical parts of electrochemical learn and in offering authors who're leaders of their fields. the result's a compelling set of reports which serves both good as a good and up to date resource of knowledge for knowledgeable researchers energetic within the box in addition to an creation for novices. From stories of the former volumes: 'This is a vital ebook for researchers in electrochemistry; it covers components of either primary and sensible value, with experiences of top quality. the fabric is especially good awarded and the alternative of issues displays a balanced editorial coverage that's welcomed.' The Analyst 'All the contributions during this quantity are good as much as the traditional of this wonderful sequence and may be of significant worth to electrochemists... The editors back need to be congratulated in this wonderful choice of reviews.' magazine of Electroanalytical Chemistry and Interfacial Chemistry '...competently and obviously written.' Berichte der Bunsen- Gesellschaft fur Physikalische Chemie
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Evidently, the Cd atoms are able to di¨use into the Au, exposing more surface Au atoms, to react with more Cd. Subsequent stripping then requires the Cd atoms to di¨use to the surface before they can oxidize, resulting in the observed irreversibility in the voltammetry . 2 mM HTeO 2 , pH 2. 0 V. There is a clear shift of nearly 200 mV between the peak 1 and its corresponding stripping peak 1 H , suggesting signi®cant irreversibility. There is closer to 400 mV between peak 2 and 2 H , indicating that the more Te is deposited, the more irreversible the process.
Fig. 18. Thickness of CdTe deposits formed with the thin-layer ¯ow-cell, as a function of the number of cycles. Adapted from ref. . 40 John L. Stickney Fig. 19. Graph showing extrapolation to the bandgap for CdTe ®lms. Adapted from ref. . the line is straight, indicating surface limited control of growth. Figure 19 is a graph of the square of absorptivity times photon energy vs. 55 eV has been extrapolated, equivalent to literature values for CdTe. Figure 15 shows a study of the potential dependence of deposit thickness, using 200 cycle CdTe deposits, formed with the large thin-layer ¯ow-cell, as a function of the Te deposition potential.
5 V, where the Cd remains stable, but some bulk Te is formed along with the Te UPD : 0 À 2HTeO 2 6H 8e 6 Te Te UPD 4H2 OX 4 The trick is that bulk Te (Te 0 ), can be stripped at a more negative potential in a supporting electrolyte (blank) solution. In this way, only Te UPD is left, due to stabilization by bonding with previously deposited Cd, forming CdTe: Te 0 Te UPD 2H 2eÀ 6 Te UPD H2 TeX 5 Equations 4 and 5 together have essentially the same result as Equation 3, oxidative UPD or the formation of a Te atomic layer.