Electrodeposition voltammogram

Figure 15.5 Cyclic voltammograms obtained inO.l M H2SO4 at a sweep rate of 0.1 V s for Pt/GC electrodes with mean particle sizes < n= 1.8 nm (1), 2.4 nm (2), and 2.8 nm (3), and Pt electrodeposited on GC (4). See the text for details. (Curves have been replotted from Maillard et al. [2004a, 2005]—Reproduced by permission of The Royal Society of Chemistry and the PCCP Owner Societies.)...

On the basis of obtained data of cyclic voltammograms for 3d metals oxides electrodeposition the optimal conditions (current density, potential, process time, electrolyte composition, temperature) for dense oxide films (Ni, Cr and Co) deposition on steel foil have been elaborated. Data relating to several best films are summarized in Table 1. 

The voltammograms in Figure 9 also indicate that it is possible to electrodeposit Ag-Al alloys in a potential range positive of the potential where the bulk deposition of aluminum is normally observed, i.e., 0 V versus A1(III)/A1. The Ag-Al alloy composition, represented as the fraction of Al in the alloy, 1 — x, was estimated from the voltammograms in Figure 9 by using the following expression... 

Fig. 19. Sampled-current voltammogram constructed from the current-time transients that resulted from a series of potential-step experiments at a stationary Pt electrode in a 35.0 x 10 3 mol L-1 solution of Ni(II) in the 66.7 m/o AlCl3-EtMeImCl melt ( ) total current, ( ) partial current for the electrodeposition of Ni, (O) partial current for the electrodeposition of Al. The total current was sampled at 3 s after the application of each potential pulse. Adapted from Pitner et al. [47] by permission of The Electrochemical Society. 

Fig. 35. Disk and ring voltammograms recorded during the oxidation of thin-layer Co-Al electrodeposits from a Pt-RRDE in pure 60.0 m/o AlCl3-EtMeImCl melt. These deposits were produced with a charge density of 425 mC cm 2 in melt containing 5.00 mmol L-1 M Co(II) at the following deposition potentials (—) 0.200, (—) 0.100, and ( ) 0 V. During stripping, the disk electrode was scanned at 0.002 V s 1, and Er was held at 0.500 V. The angular velocity of the RRDE was 104.7 rad s 1. Adapted from Mitchell et al. [44] by permission of The Electrochemical Society.

Figure 6.2-12 Cyclic voltammogram of 0.1 - 1 mmol dm Geb on gold in dry [BMIMj PFg , starting at-500 mV towards cathodic (a) and anodic (b) regime. Two quasireversible (E, and E2) and two apparently irreversible (E4 and E5) diffusion-controlled processes are observed. E3 is correlated with the growth of two-dimensional islands on the surface, E4 and E5 with the electrodeposition of germanium, Ej with gold step oxidation, and E, probably with the iodine/iodide couple. Surface area 0.5 cm (picture from [59] - with permission of the Peep owner societes).

Fig. 4.8 Square-wave voltammograms of graphite-polyester composite electrodes modified by cobalt blue (a,c), and glazed ceramic sample from Valencia, Spain (b,d), immersed into 0.10 M HCl. (a,b) Potential scan initiated at 4-0.65 V in the negative direction (c,d) potential scan initiated at —1.05 V in the positive direction after an electrodeposition step of 60 s at —1.05 V. Potential step increment 4 mV, square-wave amplitude 25 mV, frequency 15Hz[231]...

Fig. 4.13 Square-wave voltammograms of PIGEs modified with mixtures of a zirconium-containing sample plus Zr02 (standard) and ZnO (auxiliary reference material) in contact with O.IOM VaCZ. Sample ZnO mass ratio equal to 4.422 ZnO Zr02 mass ratio equal to (a) 0.163 (b) 1.216 and (c) 5.374. Potential scan initiated at —1.45 V in the positive direction without prior electrodeposition step. Potential step increment 4 mV square-wave amplitude 25 mV frequency 15 Hz. [234]...

Fig. 4.18 Stripping oxidation peaks recorded for (a) Sn02 plus auxiliary clay (50%, 50% w/w mixture), and (b) Sn02 plus PbCOs plus auxiliary clay (20%, 40%, 40% w/w mixture) specimens attached to PlGEs in contact with 0.50 M acetate buffer. Square-wave voltammograms initiated at — 1.05 V after an electrodeposition step of 30 s at that potential. Potential step increment 4 mV square-wave amplitude 25 mV frequency 15 Hz [242]...

The electrodeposition of thallium on Ag(l 10) is similar to that which takes place on the (111) face of silver [122]. The voltammogram shows well-defined structure in the formation of the first monolayer, and further deposition occurs before formation of the bulk deposit. Fig. 5.16c and d display the results for the isotropic and anisotropic response respectively. The magnitude and phase of o 2 were modeled by a constant contribution from the adatoms throughout the adsorption process (Eq. (5.4)). Values of x /Xin = 0-94 and a phase shift of 131° were obtained. As with Ag(lll), an enhancement in the anisotropic response was observed beyond 1 monolayer and was attributed to a similar resonance effect. 

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