Cyclic voltammogramm

Figure 3. Cyclic voltammogramms in 1 M H2SO4 at 2 mVjs sweep rate, and potential vs. Ag/AgCl-electrode for the untreated carbon film (ref) and the same film anodically oxidized for 300 s at 2.4 V vs. Ag/AgCl (ox).

Figure 2. Cyclic voltammogramms of a Au-electrode in pure supporting electrolyte (dotted line) and in TNT containing solution (solid line), v = 100 mV/s, 0.5 M H2SO4.

So far we recorded cyclic voltammogramms for each substance to detect and we analyzed the CVs in view of oxidation or reduction reactions which are specific for the single substance under study. This means for the interpretation of the CV single values for the verification of substances and/or tastes or odour bouquets were only used. The questions arose if it is possible to extract more information Ifom cyclic voltammogramms. For a preliminary test we tried to distinguish three explosives which contain TNT pure TNT, Composition B, and a substance called X. If only the TNT-reduction peak is used as a measure of the explosive it is not possible to distinguish these three substances on the basis of the CV. For the conducted experiments the question is then how do explosives taste ... 

Figure 1.14 Cyclic voltammogramms for 1 mM H2Se03 and 2mM ln2(SO<)3 buffered at pH 2 at 82°C. Scan rate lOmVs". RDE with a lOOnm Cu layer plated on Mo substrate, (a) 0 rpm, (b) 250 rpm.

Fig.2. Left Cyclic voltammogramm of Gl-Fc (in 0.1 mol/L [Bu4N][Pp6] CH2CI2 solution, half-wave potential = 558 mV vs. DMFc ) Right Cyclic voltammogramm of Gl-OFc (0.1 mol/L [Bu4N][Pp6] in CH2CI2CH1CN solution (4 1), half-wave potential = 559 mV vs. DMFc). The first oxidation wave belongs to decamethylferrocene that has been used as a reference in the electrochemical studies.

Genies et al. [66] have identified from cyclic voltammogramms three redox systems during the electropolymerization of o-toluidine between —0.15 and +0.7 V in a NH4F, 2.3 HF medium. The equilibrium potentials for the three redox systems are 0.09, 0.55 and 0.42 V, respectively. They have observed that the voltammograms obtained during electropolymerization of w-toluidine between —0.15... 

Fabry and Kleitz used cyclic voltammetry to study the behaviour of copper dissolved in zirconia in the temperature range of 1000 - 1200 K. More recently, van Manen and co-workers have used cyclic voltammetry between 700 and 900°C to investigate the behaviour of a number of metal/metal oxide systems consisting of Fe/Fc203, Ni/NiO, Cu/CuO, C0/C02O3. Ni/NiO was used as the reference electrode. All electrodes were prepared as tablets from physical mixtures of metal and metal oxide. All of the systems were found to be irreversible. Peaks in the cyclic voltammogrammes were ascribed to formation of oxide and metal layers which acted as diffusional barriers at the surface of the electrodes. 

Compound 83 is aceessible in a eonsecutive way by the alkynylation of FcC C-bipy(PtCl2) (81) with HC=CSiMe3 in presence of diisopropyl amine and catalytic amoimts of [Cul] to give FeC=C-bipy[Pt(C=CSiMe3)2] (82) which yields with [Cu(N=CMe)4]BF4 the trimetallic Fe-Pt-Cu complex 83 (Scheme 7) [14a, 48], The cyclic voltammogramms of 82 and 83 are shown in Figure 7. 

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