Glassy carbon electrode, scanning

Figure 13.7 Differential pulse voltammetric peaks (argon-purged MeCN/Et4NPF6 0.05 M, room temperature, glassy carbon electrode, scan rate 20 mV/s, pulse height and duration 75 mV and 40 ms) corresponding to the first reduction of the branched compound 56+ and its rotaxanes...

Figure 13.10 Cyclic voltammetric behavior on reduction of the protonated 9H3+ and deprotonated 92+ rotaxane shown in Fig. 13.9 and of its protonated and deprotonated dumbbell-shaped component (argon-purged MeCN/EtrNPFe 0.05 M, 298 K, glassy carbon electrode, scan rate 50mV/s). The current intensity has been corrected to account for the differences in diffusion coefficients.

Figure 13.20 Cyclic voltammetric behavior on reduction of 24 Et4NPF6 0.05 M, glassy carbon electrode, scan rate 50mV/s).

Figure 2. Cyclic voltammograms obtained with glucose oxidase modified with 13 1 ferrocylacetamide functions at different glucose concentrations a. 0 mM b. 0.8 mM c. 2 mH d. 4 mH e. 8 mH. 3 mm diameter glassy carbon electrodes scan rate 2 mVs". ...

The purity of a sample of K3Fe(CN)6 was determined using linear-potential scan hydrodynamic voltammetry at a glassy carbon electrode using the method of external standards. The following data were obtained for a set of calibration standards. 

Fig. 17. Cyclic voltammogram of the water-soluble Rieske fragment from the bci complex of Paracoccus denitrificans (ISFpd) at the nitric acid modified glassy carbon electrode. Protein concentration, 1 mg/ml in 50 mM NaCl, 10 mM MOPS, 5 mM EPPS, pH 7.3 T, 25°C scan rate, 10 mV/s. The cathodic (reducing branch, 7 < 0) and anodic (oxidizing branch, 7 > 0) peak potentisds Emd the resulting midpoint potential are indicated. SHE, standEU d hydrogen electrode.

Glassy carbon electrodes polished with alumina and sonicated under clean conditions show activation for the ferrl-/ ferro-cyanlde couple and the oxidation of ascorbic acid. Heterogeneous rate constants for the ferrl-/ ferro-cyanlde couple are dependent on the quality of the water used to prepare the electrolyte solutions. For the highest purity solutions, the rate constants approach those measured on platinum. The linear scan voltammetrlc peak potential for ascorbic acid shifts 390 mV when electrodes are activated. 

Figure 2. Cyclic voltammograms of ferrl-/ ferro-cyanlde couple at an activated glassy carbon electrode at scan rates of a) 20, b) 50, and c) 100 mV s . See text for details.

Figure 17.12 Direct electrocatal3ftic oxidation of D-fnictose at a glassy carbon electrode painted with a paste of Ketjen black particles modified with D-fructose dehydrogenase from a Gluconobacter species. The enzyme incorporates an additional heme center allowing direct electron transfer from the electrode to the flavin active site. Cyclic voltammograms were recorded at a scan rate of 20 mV s and at 25 + 2 °C and pH 5.0. Reproduced by permission of the PCCP Owner Societies, from Kamitaka et al., 2007.

Figure 3.59 Cyclic voltammogram of a glassy carbon electrode immersed in N2-saturated aceto-nitrile/0.2M tetraethylammonium tetrafluoroborate containing 5 x 10 3 M Re(dmbpy)(CO)3Ci, The scan rate is 100mVs 1. From Christensen et at. (1992).

FIGURE 16.4 Scanning electron micrographs of glassy carbon electrodes coated with (a) titania sol-gel and (b) titania sol-gel doped with HRP (adapted from [35]). 

These workers used a radiometer ISS 820 ion-scanning system [101,321-323] equipped with a glassy carbon electrode to determine copper at the 2-200 xg/l level in nitrogen-purged 0.45 pm Millipore-filtered seawater to which had been added 5 ppm mercury. 

Figure 1. Cyclic voltammograms in MeCN(0.1M tetra-ethylammonium perchlorate) for the oxidation of (a) a copper electrode, (b) 3 mM "OH at a glassy carbon electrode, (c) 0.5 mM "OH at a copper electrode, and (d) 3 mM "OH at a copper electrode. Scan rate, 0. IV s"1 electrode area, 0.08 cm2 copper electrode prepared by electroplating Cu(C104) onto a glassy carbon electrode (GCE). ...

FIGURE 4.8. Cyclic voltammetry of cobinamide 0.5 mM alone (dashed line) and in the presence of 1.5 mM chloroacetonitrile (solid line) in a 70-30 H20-EtOH + 0.1 M NaCl mixture on a glassy carbon electrode at a scan rate of 0.2 V/s. Adapted from Figure 1 of reference 9, with permission from the American Chemical Society. 

Kg. 18 Voltammetric response of acetonitrile solutions of 1.0 mmol dm 3 [25] (a) stationary glassy carbon electrode (0.08 cm2), scan rate 100 mV s 1 (b) same conditions as (a) with 0.5 equiv NaC104 added (c) same conditions as (a) with... 

Figure 8 Cyclic voltammograms recorded at a glassy carbon electrode in solution of [(jx-C5H5)Fe(CO)2]2 in (a) MeCN (b) CH2Cl2. Supporting electrolyte [NBu4][PF6], Scan rate 0.25 Vs l...

Cyclic voltammogram recorded at a glassy carbon electrode in a MeCN solution of the 16-metallocene complex illustrated in the scheme. Scan rate 0.1 V s... 

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