Platinum cyclic voltammogram

FIG. 26 Cyclic voltammograms of 40 monolayers of Langmuir-Schaefer films of cytochrome P450SCC on indium-tin oxide glass plate (ITO) in 10 mM phosphate buffer at a scan rate of 20 mV/s between 0.4 and —0.4 V vs. Ag/AgCl. LS films on ITO worked as the working electrode, platinum as the counter, and Ag/AgCl as the reference electrode. Cholesterol dissolved in X-triton 100 was added 50 p.1 at a time (1) with cholesterol, (2) 50 p.1 of cholesterol, (3) 100 p.1 cholesterol, and (4) 150 p.1 of cholesterol. 

Cyclic voltammetry is perhaps the most important and widely used technique within the field of analytical electrochemistry. With a theoretical standard hydrogen electrode at hand, one of the first interesting and challenging applications may be to try to use it to make theoretical cyclic voltammograms (CVs). In following, we set out to do this by attempting to calculate the CV for hydrogen adsorption on two different facets of platinum the (111) and the (100) facets. 

While at low electrode potentials the bulk electrode will be purely platinum, at high positive electrode potentials the cyclic voltammogram shows that it becomes an... 

The second most widely used noble metal for preparation of electrodes is gold. Similar to Pt, the gold electrode, contacted with aqueous electrolyte, is covered in a broad range of anodic potentials with an oxide film. On the other hand, the hydrogen adsorption/desorption peaks are absent on the cyclic voltammogram of a gold electrode in aqueous electrolytes, and the electrocatalytic activity for most charge transfer reactions is considerably lower in comparison with that of platinum. 

Fig. 8. Cyclic voltammograms of polyacetylene films on a platinum surface measured in acetonitrile containing 0.1 M Et4NBF4. Reproduced from [98],...

A cyclic voltammogram of a platinum electrode in 0.01 molL-1 methanol solution is shown in Fig. 2.2 (full line). Its main features are very well known ... 

Fig. 4.3. Cyclic voltammogram for adsorbed tin on platinum, v = 10 mV/s. Experimental procedure 11 min. adsorption from a 4 x 10-4 M Sn(S04)2 solution in 0.5 M H2S04 at 0.5 V followed by electrolyte replacement with pure supporting electrolyte.

Figure 3.30 Cyclic voltammogram of a platinum electrode in N2-saturated 1 M H2S04 in (a) the absence and (b) the presence of 1 M CH3OH. With thanks to J. Munk.

In 1986, Breikss and Abruna reported electrochemical and mechanistic studies on a close analogue of the rhenium complex, (Dmbpy)Re[CO]3Cl, where Dmbpy = 4,4 dimethyl 2,2 bipyridine. The cyclic voltammogram of the complex at platinum in CH3CN/tetrabutylammonium perchlorate is shown in Figure 3.56 for simplicity we will consider only the electrochemistry taking place above c. —2.3V vs. SCE. 

Figure 5 Cyclic voltammogram recorded at a platinum electrode in a dichloromethane solution of [Fe(t]5-C Me )2]- Scan rate 0.2 V s ...

Figure 43 Cyclic voltammograms recorded at a platinum electrode in a solution of a species able to undergo consecutive electron transfers. Starting potentials (a) 0.0 V (b) -0.8 V...

In confirmation, Figure 44 compares the cyclic voltammogram illustrated in Figure 43b with the voltammogram obtained through the use of a platinum electrode with periodical renewal of the diffusion layer. As seen, it confirms that the species undergoes consecutive oxidation processes. 

Figure 10 Cyclic voltammograms recorded at a platinum electrode in a CH2CI2 solution of [(rf-CriH6)Cr(CO)3], Supporting electrolytes (a) [NBU4] [PF6] (b) [NBu4][C104]. Scan rate 0.2 V s. (c) Molecular structure of [fr,6-C6H6)Cr(CO)3]...

Figure 2 shows a sequence of cyclic voltammograms recorded at a platinum electrode on a dichloromethane solution of ferrocene at increasing scan rates, at 25°C. 

Figure 4 Cyclic voltammograms recorded at different scan rates of a CH2Cl2 solution of 1,1 bis( diphenylphosphino)-2-[ -(((l-hydroxy-2-phenyl) amino) me thylboro-nate) ethyl]ferrocene. Platinum working electrode. Supporting electrolyte [NBu4][C104] (0.2 mol dm 3)...

Figure 31 Cyclic voltammograms recorded at a platinum electrode in (a) [l,4,8,ll,15M,22,25- 2-(f-CsH4CH2CH20)Fe(f-C5Hs) 8ZnPc]...

---